Passive Accessories

Where to Buy the Best Passive Accessories?

 

FMUSER has been one of the leading broadcast equipment suppliers for over 10 years. Since 2008, FMUSER has created a working environment that fosters creative collaboration between a staff of highly skilled engineering developers and a meticulous manufacturing team.

 

Through this spirit of and dedication to true collaboration, FMUSER has been able to create some of the most innovative electronic components, utilizing the time-tested principles of yesterday and incorporating the advanced science of today.

 

fmuser-provides-broadcast-station-equipment-with-world-supply-700px.jpg

 

One of our proudest achievements, as well as a popular choice of our many clients, is our passive components for the broadcast transmitter stations.

 

"You may find some good stuff from FMUSER. They cover all ranges of power for the Transmitter Combiner, best FM Combiner for sale, power ranging from 4kw to 15kw, 40kw to 120kw"

- - - - - James, loyal member of FMUSER

 

FMUSER High-Quality FM Combiners for Broadcast Station

 

Thanks to the world-class factory, FMUSER, as a leading broadcast equipment manufacturer, has successfully served all kinds of customers by providing reliable broadcast solutions for over 10 years, one thing is sure a high-power transmitter combiner with multiple inputs and outputs, is usually employed to broadcast multiple sets of FM programs with shared FM antennas. 

 

Our FM Combiner Works Well In:

 

  • Professional FM radio stations at provincial, municipal, and township levels
  • Medium and large FM radio stations with ultra-wide coverage
  • Professional FM radio station with millions of audience
  • Radio operators who want to buy large professional FM radio transmitters at a low cost

 

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FM Combiners: What Are They Exactly?

 

The application of the FM combiners can meet the increasing broadcast needs, and solve the problem of lack of space on the antenna tower. We all know that the FM balance combiner for the radio stations is also known as the Constant Impedance Combiner(CIB), the same as FM Combining system technology is a perfect low-cost broadcast solution for radio broadcasters.

 

The FM antenna needs to be a wideband antenna with sufficient power capacity and a full frequency band to meet the needs of the FM combiner. For different operating frequencies, various compensation methods are needed in order to match the standing wave ratio up to a standard technical level, which makes this FM combiner most applicable as an FM Combining system for the FM radio station.

 

The FM combiner technology which applies the advanced RF technology and the latest CAD technology, that has 3/4 cavities (channels) input ports in total, which means it can transmit signals from a few couples of FM solid-state FM transmitters correspondingly. It is uninterruptably designed and developed in years by our experienced RF technicians, which means this high-power FM combiner comes with reliable quality and low cost.

 

Whether you're a rookie or an expert in RF broadcast technology, it is needed to know that the 4 channels transmitter combiner is an important part and forms a connecting link between the preceding and the following in the TV transmission system. Its function is to connect outputs of the transmitter for different channels into one channel so as to use one antenna for several FM broadcast equipment for the radio stations.

 fm-combiner-is-widely-used-in-radio-broadcast-station-with-high-power-fm-transmitter-550px.jpg

 

Because the antenna is expensive, and the antenna tower can only have limited antennas, an FM combiner could dramatically reduce the cost of the FM/TV transmission system.

 

FMUSER covers different transmitter combiners for sale, like FM balanced combiner, star type combiner (branched combiner), hybrid combiner, etc., is able to meet various requirements. This product achieves tailored retirement and meets different power levels and various models combination. Unique wireless adjacent frequency transmission solution and overall layout in system avoid reusing filter, buy FM combiners from FMUSER can reduce the system transmission loss and save your cost.

 

Advice for Using an FM Combiner

 

The combiner is a passive device, which bears more power than the FM transmitter. Therefore, after the installation and adjustment, there is no need to adjust it again. The 4 cavity FM combiners are required when it is necessary to transmit multiple signals from a single antenna. Without proper combining, signals will interact in each other’s transmitters, producing intermodulation products. 

 

Several Things to Know when Using the FM Combiner

 

If you are a professional broadcast engineer, it is necessary for you to be familiar with how those rack room broadcast equipment work, including the basic principles of FM broadcasting equipment, and radio station equipment such as the FM broadcast transmitter, FM antenna, and RF combiner, etc. Fortunately, we have the best FM technical team that can help you with all kinds of how-to or what-is problems, and we also have the mentioned FM broadcast equipment for sale, they are all of the best broadcast quality, for example, FMUSER broadcast solutions are all specially customized so as to meet the needs of different radio stations, no matter in the cost or the performance of the broadcast solution, FMUSER is always the best.

 

If you are interested in more about FMUSER transmitter combiner price, well, feel free to contact us, leave your email, send us a message, or make us a call, we are 24/7 online and your message/email/call will be replied ASAP.

 

Ask for Quotation

 

How to Choose Your FM Combiner? 5 Important Steps

 

Many customers come to us and ask, "Hey, which types of FM combiners for sale are the most popular ones? What's the price for FMUSER UHF/VHF combiner?", the following contents are about how to choose the best combining system for your broadcast station.

 

Note: Well, actually, this is a commercial secret, please don't tell anyone else about these best transmitter combiners :)

  

So, how do we choose the best RF combiner? Advice from FMUSER technical team:

 

 

Step #1 Copper, silver-plated brass, and high-quality aluminum alloy are better

 

Dude, if it's about the long-term business of your radio station, whether it's an FM radio station or a national TV station, you don't want it to stop working on the day it starts working due to all sorts of strange reasons.

 

Think about it, I mean, no one wants a heavy machine that costs thousands of dollars and lots of time and effort but can't work continuously? Therefore, when you can choose to have a high-performance combiner made of better materials, such as copper, silver-plated brass, and high-quality aluminum alloy, you should make your decision in time, and FMUSER can provide you with this kind of high-performance professional broadcasting equipment. We have all you want.

 

Step #2 You Need a More Professional Combiner

 

Our technical team received so much feedback like, "God, since our boss bought a 2-way combiner for thousands of dollars from some unknown radio equipment manufacturers, the number of fans of our radio program has plummeted." or "I can't stand that poor combiner anymore!" We will then sincerely suggest to them, "Why not choose a professional multi-channel RF combiner?"

 

In most of our customers' radio stations, there are several FM transmitters or solid-state TV transmitters. At this time, those inferior combiners can't meet the modern needs of multi-channel professional transmission. You need some better equipment. FMUSER happens to cover almost all the professional multi-channel combiners you can find on the market. Let's chat, you will surely find the best one

 

Step #3 Enjoy What Your Audience Enjoys

 

Why not let the audience enjoy a better radio program while you still can. Is your audience really willing to listen to those radio programs full of harsh noise? How to have the ultimate radio program quality has become one of the goals of many of our brand repeat customers. Of course, no matter whether you are a small-town radio station or a national radio station, you don't want to lose your valuable audience. Fortunately, you can start with updating your professional broadcasting equipment, when you can have multi-function radio station equipment with ultra-low distortion, insertion loss, and low VSWR, RF combiner from FMUSER, for example, please do not hesitate. We are very honored to serve you and your audience

 

Step #4 Size is just as Important

 

Generally speaking, the total area of the radio station room won't be as large as the broadcast studio, and there are a lot of necessary broadcasting equipment, such as cabinet-type broadcasting transmitters, feeders, waveguide inflators, etc., which means that your technical team must reasonably arrange a location for the combiner without affecting the work of that expensive equipment, The common combiner may be too large to enter the rack room, which proves that the compact design is one of the important reasons why our RF combiner is still popular in large and medium-sized broadcast stations

 

Step #5 The Internal Structure still Needs to be Considered

 

What kind of broadcasting equipment can be called excellent broadcasting equipment? This is a question worth pondering. Take the combiner as an example. In hundreds of after-sales feedback of our RF combiners sold all over the world, we found some interesting content: more than half of our customers reported that they did not consider the price and appearance the first time when making an inquiry. On the contrary, they were attracted by some details that ordinary people could not pay attention to, For example, when Jack from London showed much interest in one of our broadcast turnkey solutions for his municipal radio station, we provided him with a customized multi-structure 40kw transmitter combiner with three cavities. The biggest feature of this model is its simple structure and convenient multi-frequency integration. In fact, Jack's radio station is one of the most famous in the area, and that 40kw combiner is still serving Jack and his audience since 2014. Of course, this is only one of the excellent after-sales feedback of our RF combiners. Many other customers appraised that our combiner has a small temperature rise, professional redundant power capacity design, power combination, etc. We have the ability and the confidence to provide you with a better broadcast service

 

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What are the Different types of RF Combiner? 

 

Specifically, they are divided into: 

 

  • VHF CIB Combiners
  • VHF Digital CIB Combiners
  • VHF Starpoint Combiners
  • UHF ATV CIB Combiners
  • UHF DTV CIB Combiners
  • UHF Stretchline Combiners
  • UHF DTV Starpoint Combiners
  • UHF ATV Starpoint Combiners
  • UHF Digital CIB Combiner - Cabinet Type 
  • L-Band Digital 3-channel Combiners

 

We have the best multi-channel FM combiners for sale, buy transmitter combiners that power ranging from 4kW to 120kW from FMUSER! Specifically, they are 4 kW, 15 kW, 40 kW, 50 kW, 70 kW, and 120 kW FM CIB combiners with 3 or 4 channels, available FM CIB combiners with multiple channels from FMUSER, and frequency with 87 -108MHz, well, they are also known as the FM balanced combiners, which is totally different from the star type combiners for sale; In exception to the Balanced combiners, Starpoint combiners are also one of the best-selling FM combiners types, power ranging from 1kW to 10kW, specifically, they are 1kW, 3kW, 6kW, 10kW FM Starpoint combiners with 3, 4, or 6 channels, and frequency with 87 -108MHz, these type of combiners are also known as star type combiners.

 

We also have the best multi-channel UHF/VHF TV combiners for sale, buy TV combiners that power ranging from 3kW to 40kW from FMUSER!

 

These combiners are 1 kW, 3 kW, 4 kW, 6 kW, 8 kW, 8/20 kW, 10 kW, 15 kW, 20kW, 15/20 kW, 24 kW, 25kW, 40 kW VHF/UHF TV combiners with 3, 4, 6 channels or dual-mode waveguide filters, they are also known as the FM branched combiners, some of them are the solid-state type or cabinet type combiner, some of them are L-band digital type combiners, but most of them are CIB combiners or star type (or Star point) combiners, with frequency ranging from 167 - 223 MHz, 470 - 862 MHz, 1452 - 1492 MHz

 

Here is some useful info about the available transmitter combiners with excellent after-sales feedback years around, you may be interested in:

 

Chart A. CIB 4 kW Transmitter Combiners Price

 

The Next is FM Balanced Combiner for Sale | Skip

 

Classification Model Power Min. Frequency Spacing Narrow Band Input Max. Input Power WideBand Input Max. Input Power Channel/Cavity  Visit for More
FM A 4 kW 1.5 MHz 1 kW 3 kW 3 More
FM A1 4 kW 1 MHz * 1 kW 3 kW 4
FM B 4 kW 1.5 MHz 3 kW ** 4 kW ** 3 More
FM B1 4 kW 0.5 MHz* 3 kW ** 4 kW ** 4

Notice: 

* Combiner with frequency spacing less than 1 MHz can be customized

** The sum of NB and WB input power should be less than 4 kW

 

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Chart B. High Power FM CIB (balanced type) Combiner for Sale

 

The Previous is a 4kW High Power Transmitter Combiner Price | Skip

The Next is FM Starpoint Combiner for Sale | Skip

 

Classification Power Model
Channel/Cavity 
Min. Frequency Spacing Narrow Band Input Max. Input Power WideBand Input Max. Input Power Visit for More
FM

4 kW

A 3 1.5 MHz 1 kW 3 kW More
A1
4 1 MHz * 1 kW 3 kW
B 3 1.5 MHz 3 kW ** 4 kW ** More
B1 4 0.5 MHz* 3 kW ** 4 kW **
15 kW
A 3 1.5 MHz
Narrow Band Input
6 kW **
WideBand Input



15 kW **
More
A1 4 0.5 MHz*
6 kW **
15 kW **
B 3 1.5 MHz
10 kW **
15 kW **
More
B1 4 0.5 MHz*
10 kW **
15 kW **
40 kW
A 3 1.5 MHz
Narrow Band Input
10 kW WideBand Input
30 kW More
A1 4 0.5 MHz*
10 kW 30 kW
50 kW
A
3 1.5 MHz
Narrow Band Input
20 kW **
WideBand Input
50 kW **
More
A1
4 0.5 MHz*
20 kW **
50 kW **
70 kW/120kW A 3 1.5 MHz*
Narrow Band Input
30 kW **
WideBand Input
70 kW** More
70 kW/120kW
A1 3 1.5 MHz*
30 kW **
120 kW**
More

Notice: 

* Combiner with frequency spacing less than 1 MHz can be customized

** The sum of NB and WB input power should be less than 4 kW

 

Ask for Quotation

 

Chart C. High Power FM Starpoint Combiner Price

 

The Previous is CIB FM Combiner for Sale | Skip

The Next is Solid-State N-Channel Transmitter Combiner Price | Skip

 

Classification Power Model
Channel/Cavity 
Connectors Min. Frequency Spacing Max. Input Power Visit for More
FM 1 kW A 3 7-16 DIN
3 MHz 2 x 500 W More
FM 1 kW A1
4 7-16 DIN
1.5 MHz 2 x 500 W
FM 3 kW A 3 7-16 DIN
3 MHz 2 x 1.5 kW More
FM 3 kW A1 4 7-16 DIN
1.5 MHz 2 x 1.5 kW
FM
6 kW A 3 1 5/8"
3 MHz
2 x 3 kW
More
FM
6 kW
A1 4 1 5/8"
1.5 MHz
2 x 3 kW
FM
10 kW
A 3 1 5/8"
3 MHz
2 x 5 kW
More
FM
10 kW
A1 4 1 5/8"
1.5 MHz
2 x 5 kW
FM 20 kW
A 3 3 1/8"
3 MHz
2 x 10 kW More
FM 20 kW
A1 4 3 1/8"
1.5 MHz
2 x 10 kW

Notice: 

* Combiner with frequency spacing less than 1 MHz can be customized

** The sum of NB and WB input power should be less than 4 kW

 

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Chart D. Solid-State N-Channel Transmitter Combiner 

 

The Previous is FM Star Type Combiner for Sale | Skip

The Next is UHF/VHF Balanced Combiner for Sale | Skip

 

Classification Power Channel/Cavity 
Connectors Min. Frequency Spacing Max. Input Power Visit for More
FM 1 kW 2 1 5/8"
3 MHz N x 1 W (N<5) More

 

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Chart E. High Power CIB UHF/VHF Combiner for Sale

 

The Previous is Solid-State N-Channel Transmitter Combiner Skip

The Next is VHF Branched Combiner Price | Skip

 

Classification Power Model
Channel/Cavity 
Min. Frequency Spacing Narrow Band Input
Max. Input Power WideBand Input
Max. Input Power Visit for More
VHF 15 kW A 3 2 MHz 6 kW * 15 kW * More
VHF 15 kW A1
4 1 MHz 6 kW * 15 kW *
VHF 15 kW B 3 2 MHz 10 kW * 15 kW * More
VHF 15 kW B1 4 1 MHz 10 kW * 15 kW *
VHF  24 kW
N/A 6 0 MHz
6 kW
18 kW
More
VHF 40 kW A 3 2 MHz
10 kW
30 kW
More
 VHF 40 kW A1 4 1 MHz
10 kW
30 kW

Notice: 

* Combiner with frequency spacing less than 1 MHz can be customized

** The sum of NB and WB input power should be less than 4 kW

 

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Chart F. High Power VHF Starpoint Combiner Price

 

The Previous is UHF/VHF Balance Combiner for Sale Skip

The Next is UHF ATV Balanced Combiner for Sale | Skip

 

Classification Power Model
Channel/Cavity 
Dimensions Min. Frequency Spacing Max. Input power Isolation between Inputs Visit for more
VHF 3 kW A 4 650 × 410 × 680 mm
2 MHz 2 x 1.5 kW ≥ 40 dB More
VHF 3 kW A1
6 990 × 340 × 670 mm
1 MHz 2 x 1.5 kW ≥ 55 dB
VHF 6 kW A 4 L × 930 × H mm *
2 MHz 2 x 3 kW ≥ 40 dB More
VHF 6 kW A1 6 L × 705 × H mm *
1 MHz 2 x 3 kW ≥ 50 dB
VHF 10 kW
A 3 L × 880 × H mm *
4 MHz
2 x 5 kW
≥ 45 dB
More
VHF 10 kW A1 4 L × 1145 × H mm *
2 MHz
2 x 5 kW
≥ 40 dB

Notice: 

* L and H depend on channels.

 

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Chart G. High Power UHF ATV CIB Combiner for Sale

 

The Previous is VHF Starpoint Combiner for Sale Skip

The Next is UHF DTV Balanced Combiner Price | Skip

 

Classification Power Model
Channel/Cavity 
Min. Frequency Spacing Narrowband Input
 
 
 
 
Max. Input power Wideband Input
 

 
 
 
Max. Input power
Visit for more
UHF 8 kW A 4 1 MHz 2 kW * 8 kW * More
UHF 8 kW B 4 1 MHz 5 kW * 8 kW *
More
UHF 25 kW A 4 1 MHz 20 kW * 25 kW *
More

UHF 25 kW A1 6 1 MHz 20 kW * 25 kW *

Notice: 

* The sum of NB and WB input power should be less than 8 kW

 

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Chart H. High Power UHF DTV CIB Combiner for Sale

 

The Previous is UHF ATV Balanced Combiner for Sale Skip

The Next is Solid-State UHF Digital Balanced Combiner Price | Skip

 

Classification Power Model
Channel/Cavity 
Min. Frequency Spacing Narrowband Input
 
 
 
 
 
 
Max. Input power Wideband Input
 

 
 
 
 
 
Max. Input power
Visit for more
UHF 1 kW A 6 0 MHz 0.7 kW RMS * 1 kW RMS * More
UHF 1 kW B 6 0 MHz 1.5 kW RMS * 6 kW RMS *
More
UHF 6 kW A 6 0 MHz 3 kW RMS * 6 kW RMS *
More
UHF 16 kW A 6 0 MHz 3 kW RMS * 16 kW RMS *
More
UHF
16 kW
B 6 0 MHz
6 kW RMS *
16 kW RMS *
More
UHF
25 kW
A 6 0 MHz 6 kW RMS *
25 kW RMS *
More

Notice: 

* The sum of NB and WB input power should be less than 8 kW

 

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Chart I. Solid-State UHF Digital Balance Combiner 

 

The Previous is UHF DTV Balance Combiner Price Skip

The Next is UHF DTV Star Type Combiner for Sale | Skip

 

Classification Power Channel/Cavity 
Min. Frequency Spacing Narrowband Input

Max. Input Power Wideband Input
 
Max. Input Power
Visit for More
UHF 1 kW 6 0 MHz 0.7 kW RMS * 1 kW RMS *
More

Notice:
* The sum of NB and WB input power should be less than 1 kW

 

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Chart J. High Power UHF DTV Starpoint Combiner for Sale

 

The Previous is Solid-State UHF Digital CIB Combiner Skip

The Next is UHF ATV Starpoint Combiner Price | Skip

 

Classification Model
Channel/Cavity 
Dimensions Min. Frequency Spacing Max. Input power Connectors Weight
Visit for More


UHF A 6 600 × 200 × 300 mm
1 MHz 2 x 350 W 7-16 DIN ~ 15 kg
More
UHF B
6 800 × 350 × 550 mm
1 MHz 2 x 750 W 1 5/8" ~ 38 kg
More
UHF C 6 815 × 400 × 750 mm
1 MHz 2 x 1.6 kW 1 5/8" ~ 57 kg
More
UHF D 6 1200 × 500 × 1000 mm
1 MHz 2 x 3 kW 1 5/8", 3 1/8"  ~ 95 kg
More

 

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Chart K. High Power UHF ATV Starpoint Combiner Price

 

The Previous is UHF DTV Starpoint Combiner for Sale Skip

The Next is UHF Stretchline Combiner for Sale | Skip

 

Classification Power Model
Channel/Cavity 
Dimensions Min. Frequency Spacing Max. Input power Connectors Weight Visit for More
UHF 20 kW A 4 Depend on channels
2 MHz 2 x 10 kW 3 1/8" ~ 45 - 110 kg
More
UHF 15 kW B 4 Depend on channels
2 MHz 10 kW / 5kW 3 1/8" ~ 65 - 90 kg
More

 

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Chart L. High Power UHF Stretchline Combiner for Sale

 

The Previous is UHF ATV Starpoint Combiner Price Skip

The Next is High Power L-band Digital 3-Channel Combiner | Skip

 

Classification Power Model
Insertion Loss
Dimensions Min. Frequency Spacing Max. Input power Connectors Weight Visit for More
UHF 8 A ≤0.2  dB 550 × 110 × H mm *
5 MHz 2 x 4 kW 1 5/8" Depend on channels
More
UHF 20 B ≤0.1  dB 720 × 580 × H mm *
5 MHz 2 x 10 kW 3 1/8" Depend on channels
More

Notice:

* H depends on channels

 

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Chart M. High Power L-band Digital 3-Channel Combiner 

 

The Previous is UHF ATV Starpoint Combiner for Sale Skip

Back to Chart A. 4 kW Transmitter Combiners Price | Skip

 

Classification Power Channel/Cavity 
Min. Frequency Spacing Max. Input Power
Isolation between Inputs
Weight Dimensions Visit for More
Improved CIB 4 kW 6 1 MHz 3 x 1.3 kW
≥ 60 dB
~ 90 kg
995 × 710 × 528 mm
More

 

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Let's bring it back, in the process of use, we must always pay attention to the joints and plug cores of relevant bend flanged and copper pipes. Due to long-time use and the vibration of the radio rack room, these things may become loose.

 

Especially when you're responsible for some FM broadcast equipment with high value, for example, the high power FM combiner, it is required to: 

 

  • Doing maintenance work regularly, days/weeks/months, etc.
  • Creating a good working condition is an important guarantee of safe and high quality. 

 

Therefore, we should:

 

  1. Pay attention to the temperature of each bend flanged and copper pipe joint. 
  2. Always remember that the maintenance work should be meticulous, which means making upkeep records and summaries are needed so that our professional skill level can be continuously improved to ensure the best broadcast quality of the front-end broadcast program. 
  3. When the contact is poor, the temperature will rise quickly. In case of such a problem, we must solve it in time, to replace the bend flanged or to replace the plug. 

 

FMUSER Solid-state RF Dummy Loads 

 

"You may find some good stuff from FMUSER. They cover all ranges of power for the RF dummy load, best high power RF dummy load, and ultra-high power RF load for sale, power ranging from 1kw to 5kw, 10kw to 200kw"

----- James, loyal member of FMUSER

 

RF Dummy Loads from 1KW to 5KW or More

 

Here are what we cover: 1000 watt, 1200 watt, 2000 watt, 2500 watt, 3000 watts, 4000 watts, 1kw, 1.2kw, 2.5kw, 3kw,4kw, 5kw, 1000W, 1200W, 2500W, 3000W, 4000W, 5000W.

 

fmuser 1kw dummy load 1000 watt rf load 700px.jpg fmuser 1.2 kw dummy load rf 700px.jpg fmuser 1.5kw dummy load 1500 watt rf load 700px.jpg
1KW Dummy Load RF 1.2KW Dummy Load RF 1.5KW Dummy Load RF
fmuser 2kw dummy load 2000 watt rf load 700px.jpg fmuser 2.5kw dummy load 2500 watt rf load 700px.jpg fmuser 3kw dummy load 3000 watt rf load 700px.jpg
2KW Dummy Load RF 2.5KW Dummy Load RF 3KW Dummy Load RF
fmuser 4kw dummy load 4000 watt rf load 700px.jpg fmuser 5kw dummy load 5000 watt rf load 700px.jpg fmuser 10kw dummy load 10000 watt rf load 700px.jpg
4KW Dummy Load RF 5KW Dummy Load RF 10KW Dummy Load RF
fmuser 15kw dummy load 15000 watt rf load 700px.jpg fmuser 20kw dummy load 20000 watt rf load 700px.jpg fmuser 50kw dummy load 50000 watt rf load 700px.jpg
15KW Dummy Load RF 20KW Dummy Load RF 50KW Dummy Load RF
fmuser 75kw dummy load 75000 watt rf load 700px.jpg fmuser 100kw dummy load 100000 watt rf load 700px.jpg fmuser 200kw dummy load 200000 watt rf load 700px.jpg
75KW Dummy Load RF 100KW Dummy Load RF 200KW Dummy Load RF

Those are the most commonly seen types of RF dummy loads, they are also the most popular high-power dummy loads among our customers, if you're looking for high power rf dummy load for sale, please make sure to find FMUSER, we sell broadcast equipment of amazing quality at a budget cost.

 

Additionally, in order to meet different needs of RF dummy loads, we also provide ultra high power RF loads for sale: 15000 watts, 50000 watts, 75000 watts, 100000 watts, 200000 watts, 10kw, 15kw, 50kw, 75kw, 100kw, 10000W, 15000W, 20000W, 50000W, 75000W, 100000W, 200000W, these RF dummy loads, which are specially designed for the medium and large FM radio stations, has now gained many favors from our customers who engage in first-line RF technical area 

  

Our dummy loads are featured by:

 

  • Professional FM radio stations at provincial, municipal, and township levels
  • Medium and large FM radio stations with ultra-wide coverage
  • Professional FM radio station with millions of audience
  • Radio operators who want to buy large professional FM radio transmitters at a low cost

 

RF Dummy Loads World Supply with Best Quality

 

FMUSER is also one of the best FM broadcast equipment suppliers and manufacturers in the following countries and regions: Afghanistan, Albania, Algeria, Andorra, Angola, Antigua and Barbuda, Argentina, Armenia, Australia, Austria, Azerbaijan, The Bahamas, Bahrain, Bangladesh, Barbados, Belarus, Belgium, Belize, Benin, Bhutan, Bolivia, Bosnia and Herzegovina, Botswana, Brazil, Brunei, Bulgaria, Burkina Faso, Burundi, Cabo Verde, Cambodia, Cameroon, Canada, Central African Republic, Chad, Chile, China, Colombia, Comoros, Congo, Democratic Republic of the, Congo, Republic of the, Costa Rica, Côte d’Ivoire, Croatia, Cuba, Cyprus, Czech Republic, Denmark, Djibouti, Dominica, Dominican Republic, East Timor (Timor-Leste), Ecuador, Egypt, El Salvador, Equatorial Guinea, Eritrea, Estonia, Eswatini, Ethiopia, Fiji, Finland, France, Gabon, The Gambia, Georgia, Germany, Ghana, Greece, Grenada, Guatemala, Guinea, Guinea-Bissau, Guyana, Haiti, Honduras, Hungary, Iceland, India, Indonesia, Iran, Iraq, Ireland, Israel, Italy, Jamaica, Japan, Jordan, Kazakhstan, Kenya, Kiribati, Korea, North, Korea, South, Kosovo, Kuwait, Kyrgyzstan, Laos, Latvia, Lebanon, Lesotho, Liberia, Libya, Liechtenstein, Lithuania, Luxembourg, Madagascar, Malawi, Malaysia, Maldives, Mali, Malta, Marshall Islands, Mauritania, Mauritius, Mexico, Micronesia, Federated States of, Moldova, Monaco, Mongolia, Montenegro, Morocco, Mozambique, Myanmar (Burma), Namibia, Nauru, Nepal, Netherlands, New Zealand, Nicaragua, Niger, Nigeria, North Macedonia, Norway, Oman, Pakistan, Palau, Panama, Papua New Guinea, Paraguay, Peru, Philippines, Poland, Portugal, Qatar, Romania, Russia, Rwanda, Saint Kitts and Nevis, Saint Lucia, Saint Vincent and the Grenadines, Samoa, San Marino, Sao Tome and Principe, Saudi Arabia, Senegal, Serbia, Seychelles, Sierra Leone, Singapore, Slovakia, Slovenia, Solomon Islands, Somalia, South Africa, Spain, Sri Lanka, Sudan, Sudan, South, Suriname, Sweden, Switzerland, Syria, Taiwan, Tajikistan, Tanzania, Thailand, Togo, Tonga, Trinidad and Tobago, Tunisia, Turkey, Turkmenistan, Tuvalu, Uganda, Ukraine, United Arab Emirates, United Kingdom, United States, Uruguay, Uzbekistan, Vanuatu, Vatican City, Venezuela, Vietnam, Yemen, Zambia, Zimbabwe

 

How to Use Dummy Loads for Transmitters?

 

"Whether you are a professional RF technician or a radio enthusiast, it is commonly recognized that: If you want to carry out RF tests of the FM radio transmitter without using the FM broadcast antenna, then use the RF dummy load."

-----Ray Chan, a technical employee from FMUSER

 

Wait, what kind of transmitter can you use a dummy load along with? Ok, this secret should never say it easily but it may be useful to you: When the power of the dummy load and the FM transmitter is similar, the bigger power the dummy load has, the more transmitter of different powers can be used, in a way, it means if you have a 20kw dummy load, you can use the transmitters with power below the 20kw (50 watts, 500 watts, 600 watts, 1kw, 2kw, 2.5kw, 3kw, 4kw, 5kw, 10kw, etc); when you have a dummy load which power is up to 200KW, you can use dozens of FM transmitters of all kinds of ranged power

 

Of course, you can use the dummy load along with almost all FM broadcast transmitters of all power range, we happen to manufacture the following types of available FM radio transmitters: 500W, 600W, 700W, 1000W, 1200W, 1500W, 2000W, 2500W, 3000W, 3500W, 5000W, 6000W, 7000W, 10000W, 15000W, 20000W, 30000W, 40000W, 50000W, 60000W, 70000W, 80000W, 1000 watt, 1200 watt, 1500 watt, 2000 watt, 2500 watt, 3000 watt, 3500 watt, 5000 watt, 6000 watt, 7000 watt, 10000 watt, 15000 watt, 20000 watt, 30000 watt, 40000 watt, 50000 watt, 60000 watt, 70000 watt, 80000 watt, 1kw, 2kw, 3.5kw, 5KW, 4KW, 5.3KW, 5.4kW, 8KW, 10KW, 15KW, 18KW, 20KW, 22.5kW, 25KW, 30KW, 35KW, 40KW, 45KW, 46.4KW, 50KW, 50.7KW, 55KW, 65KW, 75KW, 80KW, 100kw, 130kw, 150kw, 230kw, 250kw, 274kw, 300kw, 500kw, 700kw, 748kw, 1000kw, 2000kw, and plenty of even higher power types of FM transmitters. 

How do FM Branched Combiners and FM Balanced Combiners Works?

Fixed impedance filter type balanced duplexer. It consists of two identical 3dB directional couplers, four resonant cavity bandpass filters, two coaxial feeders of equal length, and a 50 - ohm absorption load. The 1-end is the F3 frequency signal, and the 5-end is the F1 + F2 signal input port of star diplexer.

 

 

*Star Point Combiner & balanced Combiner

  

The F3 signal is input from one end of the first 3dB coupler, and the power is divided into two by 3dB coupler 1, then half of the power is output at the 3-end and the 4-end respectively. The phase of the 3-end is the same as that of the  1-end, and the phase of the 4-end is 90 ° behind that of the 3-end. Due to the influence of two bandpass filters on F3, the signal passes through the middle of the filter unimpeded and is transmitted to the second 3dB coupler According to the inverse characteristics of the third dB coupler, the two powers are equal, and the phase of the 7-terminal signal is 90 ° behind that of the 6-terminal signal.

 

Because the previous 4-terminal signals are 90 ° behind the 3-terminal signals, the F3 signals at the 6-terminal are synthesized in-phase and sent to the antenna for transmission, while the F3 signals at the 5-terminal are reversed-phase and cancel each other, so the F3 signals will not enter the F1 + F2 channels to cause crosstalk. The F1 + F2 signal is input from 5 terminals, and the power is divided into upper and lower channels. The resonant cavity has total reflection to the F1 + F2 signal, so it is synthesized in phase at the 6-end and canceled in phase at the 5-end by a 3dB coupler. Finally, F1, F2, and F3 are synthesized at six terminals and sent to the antenna to realize frequency synthesis

 

Brief introduction of the 3dB Coupler

 

The 3dB coupler consists of two pairs of λ/4 terminals of the inner conductor and the outer conductor form four ports, which are converted into the interface between the same transmission line and the outer circuit. Each port has the same characteristic impedance, which is 50 ohm.

 

When the F3 power signal is input from the 1-end, half of the power is output at the 3-end, which is in phase with the first end, and half of the power is output at the 4-end. However, the phase is 90 ° behind the 1-end, and there is no output at the 2-end, so the 2-end and the 1-end are isolated from each other, and signals of different frequencies can be sent at the two ports to realize the duplex. Ideally, the 2-end does not affect the performance of the coupler, and the input impedance of the 1-end is independent of the frequency, so it shows broadband characteristics.

 

The 3dB coupler itself is a simple duplexer. In actual use, the two terminals will crosstalk a small number of signals, so the absorption resistance is used to absorb the consumption.

 

Brief Introduction of the Bandpass Filter

 

The band-pass filter is mainly composed of two resonators with two λ/4 end-open terminals. The two resonators are coupled by small holes, which is similar to the double loop parallel resonant circuit. The input and output are ring-coupled, and the required passband characteristics are obtained by designing the ring coupling area and the coupling aperture area

 

 

 *The Connections of transmitter combiner

 

Experimental Test of the FM Combiners

 

We select a network analyzer with incident/reflection test accessories. The test frequency range of the instrument is 4 ~ 1300mhz, and the test data can be read directly on the instrument. The input impedance and output impedance of the instrument are both 50ohm, which is the same as that of the multiplexer. The reflection loss, isolation degree, and insertion loss can be read directly on the screen of the instrument, which eliminates the intermediate error, improves the accuracy of the measurement results, and facilitates the analysis of the results.

 

 

 

 

 

The Solution of Intermodulation Frequency

 

  • Synthesizing three transmitters through the multi-channel combiner and transmitting in the way of a transmitting antenna. This requires that the transmitting antenna must be fully broadband. Due to the high isolation of the multiplexer, the crosstalk power is very small
  • Connecting a point frequency filter on the 105.5mhz transmitter, the isolation is only greater than 30dB, so when its transmitting antenna receives the signal, the received signal cannot reach the 105.5mhz power amplifier unit due to the full reflection of the filter, so the intermodulation frequency cannot be formed, which fundamentally solves the interference problem

 

The Solution of Intermodulation Frequency for Multifrequency Generation

 

There are three frequencies, 105.5mhz, 94.2mhz, and 89mhz, of which 105.5mhz is connected with a pair of the vertically polarized transmitting antenna and 94.2mhz.89mhz is combined with a pair of vertically polarized transmitting antennae through a star diplexer. Because the two antennas are on the same tower, the 105.5mhz transmitting antenna is not only the transmitting antenna of this frequency but also the receiving antenna.

 

It receives 94.2mhz and 89mhz signals, and these two signals will generate intermodulation signals on the 105.5mhz transmitter power amplifier. The generated frequencies are 105.5 - 89 + 105.5 = 122mhz, and the other frequency is 105.5 - 94.2 + 105.5 = 116.8mhz. These two frequencies are sent out through the transmitting antenna. If there is a local navigation frequency, it may be in the range.

What is FM Star Point Combiner
  • FM Branched Combiner is suitable for narrow-band signals such as FM transmitters. It is composed of two band-pass filters with different frequencies. They resonate in parallel with their respective frequencies, and the signal can pass through the filter circuit without hindrance.
  • FM Branched Combiner is composed of a filter, star point, and connecting line. All transmitters are connected with the star point through the filter and connecting line, and the Starpoint combiner is connected with the antenna.
  • FM Branched Combiner is composed of two bandpass filter resonators BPF1 and BPF2 connected with a T - shaped tee coupling. Each bandpass filter resonator corresponds to a selected frequency and blocks another frequency
  • FMUSER is also one of the most famous star type combiner suppliers in the radio broadcast equipment industry, buy Starpoint combiner with multiple channels and cavities from FMUSER, we provide both the best quality and price, as well as  customized FM Combining system solution for radio station

Why You Need an FM Combiner?

What is an RF Combiner?

 

Simply put, an RF combiner is a device that acts as a transmission component. It combines the power between two or more ports, and they are most commonly used for connecting more than one antenna to a single radio. RF combiners can also be used to connect multiple radios to a single antenna using the same frequency.

 

The broadcasters can mix multiple FM broadcast signals into the transmitter combiner (AKA: FM star point combiners or FM balanced combiners), or mix the TV signals into the UHF/VHF combiners (AKA: UHF VHF Starpoint combiners or balanced combiners) and the audience can listen to multiple broadcast programs at the same time. Transmitting several frequencies from a single broadband antenna system requires the use of a combining system, or combiner, composed of RF filters and interconnecting transmission lines. There are two types of multi-channel combiners, which is the FM combiner and the TV combiner, they are different in terms of specific use:

  • FM Combiner - FM Branched Combiner (Star Point Combiner)/FM Balanced Combiner (CIB-Constant Impedance Combiner)
  • TV Combiner - UHF/VHF Combiner (UHF/VHF balanced combiner and branched combiner)

 

Why is RF Combiner so Important?

 

In order to solve the problem of resource shortage of antenna towers, the shared tower technology for FM and TV multi-channels can be used. 

 

Over the years, technology and changed, and electronic communication has become an essential and vital part of everyday life, and at FMUSER, we have recognized these facts. We have been consistently researching and developing new ways to improve our RF combiner options to ensure that our customers will always be able to find an RF combiner that will not only work retroactively but also work with emerging technologies.

 

FMUSER offers a wide array of multi-channel duplexers and triplexers for sale to combine analog and HD Radio digital FM signals. These products include 10 dB Hybrid Injectors, Reverse Fed Constant Impedance FM Channel Combiners, and High-Efficiency Diplexer.

 

Why do You Need a High Power FM Balanced Combiner for Your Radio Station?

 

With the rapid development of the global radio and television industry, radio and TV stations in many countries and regions are adding FM channels and TV channels. In terms of performance and cost, it should be an inevitable choice to use a multi-channel transmitter combiner to realize multi-channel shared tower transmitting broadcasting. 

 

Taking the 4 channels transmitter combiner as an example, such a mixed RF device can transmit a plurality of different frequencies transmitter signals through a shared FM transmitter antenna, which means that by using such broadcast equipment, those broadcast stations can broadcast multiple signals through ONE transmitter combiner at the same time instead of using TENS OF sets of FM broadcast antenna.

  

To be more specific, there are the following 5 reasons to briefly explain the importance of having a good multi-channel combiner for the FM/TV broadcast station:

 

  • The key equipment of the shared tower technology is the multi-channel combiner. A good FM/UF/VHF combiner can directly improve the performance of the whole signals transmission system.
  • Additionally, a good FM/UF/VHF combiner can save the cost of setting up multiple antennas, especially in some urban transmitting stations, Reducing the buying costs of RF transmitting equipment is the most effective way to maintain the operation of the FM/TV station. 
  • What's more, a tower needs to install multiple sets of TV transmitting antennas and FM broadcast antennas. However, the available height of the tower is very limited.
  • For the FM antenna tower, generally, only a set of FM antennas is allowed to be installed on the tower, thus is necessary to use a good transmitter combiner so as to broadcast multiple sets of FM programs to the audience at the same time.
  • Therefore, it is vital to have a standard technical index test of the combiner to help measure the quality of the FM combiner, which is directly related to the broadcasting quality of FM broadcasting.

 

At fmradiobroadcast.com, we have an experienced staff ready to answer any questions you may have about finding the correct RF combiner. Feel free to contact us anytime by visiting fmradiobroadcast.com or by calling +86 - 139 - 22702227. We're always one of the most pro FM combiner manufacturers.

 

Buy Multi-Channel Transmitter Combiner for Radio Station? Here is the Right Place!

 

FMUSER is one of the best transmitter combiner manufacturers who produce 4 channel transmitter combiners for sale in near 200+ countries and regions around the world, here are the ones from which you can buy transmitter combiners:

 

Afghanistan, Albania, Algeria, Andorra, Angola, Antigua and Barbuda, Argentina, Armenia, Australia, Austria, Azerbaijan, The Bahamas, Bahrain, Bangladesh, Barbados, Belarus, Belgium, Belize, Benin, Bhutan, Bolivia, Bosnia and Herzegovina, Botswana, Brazil, Brunei, Bulgaria, Burkina Faso, Burundi, Cabo Verde, Cambodia, Cameroon, Canada, Central African Republic, Chad, Chile, China, Colombia, Comoros, Congo, Democratic Republic of the, Congo, Republic of the, Costa Rica, Côte d’Ivoire, Croatia, Cuba, Cyprus, Czech Republic, Denmark, Djibouti, Dominica, Dominican Republic, East Timor (Timor - Leste), Ecuador, Egypt, El Salvador, Equatorial Guinea, Eritrea, Estonia, Eswatini, Ethiopia, Fiji, Finland, France, Gabon, The Gambia, Georgia, Germany, Ghana, Greece, Grenada, Guatemala, Guinea, Guinea - Bissau, Guyana, Haiti, Honduras, Hungary, Iceland, India, Indonesia, Iran, Iraq, Ireland, Israel, Italy, Jamaica, Japan, Jordan, Kazakhstan, Kenya, Kiribati, Korea, North, Korea, South, Kosovo, Kuwait, Kyrgyzstan, Laos, Latvia, Lebanon, Lesotho, Liberia, Libya, Liechtenstein, Lithuania, Luxembourg, Madagascar, Malawi, Malaysia, Maldives, Mali, Malta, Marshall Islands, Mauritania, Mauritius, Mexico, Micronesia, Federated States of, Moldova, Monaco, Mongolia, Montenegro, Morocco, Mozambique, Myanmar (Burma), Namibia, Nauru, Nepal, Netherlands, New Zealand, Nicaragua, Niger, Nigeria, North Macedonia, Norway, Oman, Pakistan, Palau, Panama, Papua New Guinea, Paraguay, Peru, Philippines, Poland, Portugal, Qatar, Romania, Russia, Rwanda, Saint Kitts and Nevis, Saint Lucia, Saint Vincent and the Grenadines, Samoa, San Marino, Sao Tome and Principe, Saudi Arabia, Senegal, Serbia, Seychelles, Sierra Leone, Singapore, Slovakia, Slovenia, Solomon Islands, Somalia, South Africa, Spain, Sri Lanka, Sudan, Sudan, South, Suriname, Sweden, Switzerland, Syria, Taiwan, Tajikistan, Tanzania, Thailand, Togo, Tonga, Trinidad and Tobago, Tunisia, Turkey, Turkmenistan, Tuvalu, Uganda, Ukraine, United Arab Emirates, United Kingdom, United States, Uruguay, Uzbekistan, Vanuatu, Vatican City, Venezuela, Vietnam, Yemen, Zambia, Zimbabwe

 

Important Electrical Index of the 4 Chan FM Combiner

 

40kW transmitter combiner with 4 channels from FMUSER is used to combine RF from a number of different sources. The FM combiners can be used in a myriad of different applications to accomplish a variety of outcomes.

 

With such a broad range of usefulness, it can become a daunting task when it comes to choosing the right FM combiner for your needs. Basically, when choosing a multi-channel transmitter combiner, one must consider the specifications for key performance parameters, insertion loss, isolation between ports, the proximity in the amplitude of the split signals, and the closeness of the signal phase for the split signals.

 

  1.  Isolation: Isolation refers to the isolation capability of multiple devices to multiple signals of different frequencies. If the isolation capacity is poor. The intermodulation will be generated between the two signals, thus reducing the quality of FM broadcasting. Generally, the isolation degree is better than 30dB
  2.  Minimum Frequency Interval: the minimum interval between two input frequencies of duplexer is generally about 1.2MHz (balanced type) under the premise of ensuring performance index
  3.  Input Impedance: 50 ohms (coaxial), matching the output impedance of the FM transmitter.
  4.  The Output Impedance: 50 ohm (coaxial), which matches the input impedance of the antenna feeder.
  5.  Frequency Range: 87 - 108mhz (whole frequency modulation broadcast band)
  6.  Power Capacity: The power capacity of the multi-channel combiner shall be determined according to the power of the FM transmitter.
  7.  Insertion Loss: < 0.25dB (refers to the attenuation caused after the signal passes through the duplexer).
  8.  VSWR: The voltage standing wave ratio of the input terminal shall be less than 1.1

 

Important Components to Build a 4 Channels transmitter combiner

 

In order to enable a broadband antenna to transmit programs at the same time from several channels, a power combining device is needed; Secondly, in order to make the programs not interfere with each other, a frequency selection device is essential. There are many kinds of power synthesis devices, among which the most commonly used is the 3 dB coupler.

 

The frequency selection device is a filter composed of high Q resonators (such as axial cavity and waveguide cavity). Under specific conditions, by using a special waveguide cavity, the frequency can be selected and the power can be synthesized at the same time.

 

Another important component of the combiner is the bandpass filter. The most commonly used filter unit in FM is a 1/4 wavelength coaxial resonator.

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Why do You Need An Dummy Load?

In addition to allowing you to accurately adjust the parameters of the transmitter and receiver, the dummy load can also prevent damage to the device caused by misoperation. Professional RF engineers all know that a dummy load is a tool for loading equipment load to test on an amplifier or RF system.

 

If you use the antenna directly instead of any load during the test, not only can you not tune perfectly, the heat generated by RF power will directly damage your transmitter or receiver. The dummy load can be simulated the perfectly tuned antenna connected to the amplifier can avoid improper parameter settings or damage to RF equipment.

 

Therefore, we strongly recommend that you choose a reliable dummy load and use it timely and correctly when testing RF equipment to avoid unnecessary loss.

How does RF Termination Work?

In the process of RF system testing, the Rack 20kw dummy load (also known as 20000w dummy antenna) acts as the actual "antenna". It is used to simulate the load of the electrical device, which is connected to the output of the radio transmitter. It can be used to test and configure the transmitter or receiver without radiating radio waves. A 20kw dummy load rack usually consists of a resistor connected to a radiator that dissipates power from the transmitter

 

The 20000-watt dummy load is used to dissipate RF power. It is characterized by 50 Ω impedance, and the VSWR is not more than 1.20:1. Therefore, due to the low reflection coefficient, it is very useful for :

  • the maintenance of FM radio transmitter and tv transmitter
  • the load discharge of the RF filter
  • the end processing of the power synthesizer. 

 

Note: The export connectors for this series of products can be replaced from the n-type fast connector to other models easily.

 

When the load is powered on, screw out the vent hole on the breathing valve. To eliminate, due to the increase of dummy load temperature, load chamber, heated expansion of air. If the heated air is not removed in time, the pressure in the chamber will increase, so that the pressure at the gasket is too high, and the oil leakage at the loading outlet will be caused. Enough space (at least 12 inches around and top) around the load to allow air circulation and to much more easily dissipate the heat for the dummy load

 

The Fan Assembly of 20KW RF Dummy Load Rack 

 

When leaving the factory, the wiring of fan components has been installed, and special wiring is not required. The fan must be operated manually unless the component is connected with automatic operation in the factory. If the fan is not started, the power added to the false load shall not be higher than 1250W (suitable for 5kW and 10kW load with air cooling).

 

The Transmitter Interlock of Rack 20KW RF Dummy Load

 

There is an interlock between the 1 and 2 pins of three core sockets, a normally closed heat-sensitive switch (cksd301 250V 10A 60 ℃) is connected with the transmitter. If the cooling temperature of the false load is too high, the false load will be damaged, this switch will turn on and off the transmitter.

 

The Maintenance of 20KW Rack RF Dummy Load

 

Almost no maintenance is necessary, but it is needed to keep the machine clean and dust-proof. Field replacement of resistors is not recommended. However, if necessary, tighten the breathing valve and place the machine vertically with the RF connector facing up.

 

Remove the socket head screws of the 8 fixed RF components. Carefully and quickly lift the assembly so that excess oil is drained back to the radiator. Release clip at the end of the cover and remove the 6 tapered head screws. Carefully pull the cover off the resistor. To install a new resistor, follow the opposite steps, but make sure that the resistor fits perfectly with the fixture safely.

 

Check the O-ring between the radiator and RF assembly. If there is any crack or damage, it must be replaced immediately. After determining that the assembly is in the radiator, return to the horizontal position and check for coolant leakage.

 

The Suggestions for the Cooling of 20KW RF Dummy Load Rack 

In the factory, the false load is injected at normal temperature, with a special non-toxic and non-conductive coolant, and reaches the normal plane. Observe the coolant for leaks. A small amount of leakage will not affect the work, but the leakage is large, which will have adverse effects. If there is no condition, do not replace the coolant, please use the coolant provided by the original factory. The special electrical and constant temperature characteristics of the coolant are very important for the continuous and normal working resistor.

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