167-223 MHz 24kW Digital VHF CIB Combiner for TV Station

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Where to Buy the Best VHF CIB Combiner?

 

FMUSER has been one of the leading broadcast equipment suppliers for nearly half a century. Since 2008, FMUSER has created a working environment that fosters creative collaboration between 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. One of our proudest achievements, as well as a popular choice of our many clients, is our Radio Frequency System for the radio station.

 

"You may find some good stuff from FMUSER. They cover all ranges of power for the TV Transmitter Combiner, best VHF Combiner for sale, power ranging from 1kw to 40kw"

- - - - - James, loyal member of FMUSER

 

The Next Part is Advice for Using a VHF Combiner | Skip

 

What We Bring You in This Page with

 

Where to Buy the Best VHF Combiner?

Advice for Using an VHF Combiner

How to Choose RF Combiner for Broadcast Station

Why You Need an VHF Combiner?

What is FM Star Point Combiner

How FM Combiners Work

 

 FMUSER 6 Channels 24KW Digital Balanced VHF Combiner Works Well In:

 

  • Professional TV stations at provincial, municipal, and township levels
  • Medium and large TV stations with ultra-wide coverage
  • Professional TV stations with over millions of audience
  • TV operators who want to buy large professional TV equipment at a low cost

 

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 that is a high power transmitter combiner with multiple inputs and outputs, is usually employed to broadcast multiple sets of FM programs with shared FM antennas. 

 

 

The application of the 24kW Digital VHF CIB combiner can meet the increasing broadcast needs, solve the problem of lack of space on the antenna tower. We all know that the balanced VHF combiner for TV stations is also known as the Constant Impedance Combiner(CIB), the same as Radio Frequency System technology is a perfect low-cost broadcast solution for TV broadcasters.

 

The TV antenna needs to be a wideband antenna with sufficient power capacity and a full frequency band to meet the needs of the TV 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 VHF combiner most applicable as a radio frequency system for the broadcast station.

 

The FMUSER 24kW digital VHF combiner for sale, which applies the advanced RF technology and the latest CAD technology, that has 3/4 cavities 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 VHF combiner for sale 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.

 

 

Because the antenna is expensive, and the antenna tower can only have limited antennas, a balanced VHF combiner could dramatically reduce the cost of the TV transmission system.

 

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

 

▲ Where to Buy the Best VHF Combiner ▲

▲ Back to Content ▲

 

Advice for Using the 24kW Digital VHF CIB Combiner

 

The Previous Part is Where to Buy the Best VHF Combiner | Skip

The Next Part is How to Choose RF Combiner for Broadcast Station | Skip

 

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 6 cavities VHF 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 24kW VHF 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, radio station equipment such as the FM broadcast transmitter, FM antenna, 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.

 

How to Choose the Right RF Combining System?

 

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Many customers come to us and ask, "Hey, which types of  VHF TV combiners for sale are the most popular ones? What's the price for FMUSER UHF/VHF combiner?", 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:

 

 

Copper, silver-plated brass, and high-quality aluminum alloy is better

 

Dude, if it's about the long-term business of your broadcast 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 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.

 

You Need a More Professional One

 

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' broadcast 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 covers almost all the professional multi-channel RF combiners you can find on the market. Let's chat, you will surely find the best one

 

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 you are a small-town radio broadcast station or a national TV 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

 

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

 

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 contents: more than half of our customers reported that they did not consider the price and appearance at the first time when made 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 24kw TV transmitter combiner with 6 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 24kw Digital VHF CIB 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

 

We have the best multi-channel UHF/VHF TV combiners for sale, buy TV combiners that power ranging from 1kW to 40kW from FMUSER!

 

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

 

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 VHF CIB combiners or VHF star type (or Star point) combiners, with frequency ranging from 167 - 223 MHz, 470 - 862 MHz, 1452 - 1492 MHz

 

We also 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, 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.

 

Here are 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

 

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

 

The Previous is 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

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

 

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

 

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 1 kW A 3 2 MHz 6 kW * 15 kW * More
VHF 1 kW A1
4 1 MHz 6 kW * 15 kW *
VHF 1 kW B 3 2 MHz 10 kW * 15 kW * More
VHF 1 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

 

Chart F. High Power VHF Starpoint Combiner Price

 

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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.

 

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

 

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

 

Chart I. Solid-State UHF Digital Balance Combiner 

 

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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

 

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

 

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

 

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

 

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

 

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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

 

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 TV broadcast equipment with high value, for example, the high power VHF combiner, it is required to: 

 

  • Doing maintenance work regularly, days/weeks/months, etc.
  • Creating a good working condition is an important guarantee for 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. 

 

▲ Advice for Using a VHF Combiner ▲

▲ Back to Content ▲

 

You Need a 24kW Digital VHF CIB Combiner More than Ever

 

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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 Combiners, and VHF/UHF TV Combiner and High-Efficiency Diplexer.

 

Why You Need a High Power FM Balanced Combiner for Your Broadcast 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 6 channels transmitter combiner as an example, such a mixed RF device can transmit a plurality of different frequencies transmitter signals through a shared 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 or TV 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/UHF/VHF combiner can save the cost of setting up multiple antennas, especially in some urban transmitting stations, reduce 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 on 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 for 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 RF combiner manufacturers.

 

Buy VHF TV Transmitter Combiner for Broadcast Station? Here is the Right Place!

 

FMUSER is one of the best transmitter combiner manufacturers who produce VHF CIB 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 24kW Digital VHF CIB Combiner

 

A 24kW VHF TV transmitter combiner from FMUSER is used to combine RF from a number of different sources. The VHF 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 VHF TV 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: 167-223 MHz
  6.  Power Capacity: The power capacity of the multi-channel combiner shall be determined according to the power of the TV transmitter.
  7.  Insertion Loss: < 0.25dB (refers to the attenuation caused after the signal passing 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 6 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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What is FM Star Point Combiner

 

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  • 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 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

 

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How FM Branched Combiners and FM Balanced Combiners Works?

 

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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 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 F1 + F2 signal, so it is synthesized in phase at the 6-end and canceled in phase at the 5-end by 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 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 transmit 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, and 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, 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 antenna 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.

 

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  • 24kW Banlanced VHF Digital TV Combiner x 1PCS 

 

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What You Need to Know About 24kW Digital VHF CIB Combiner

 

The “double bridge” combining filters allows easy changes to new figures of the operating frequencies. With 100% modulation, they can satisfactorily separate two adjacent frequencies up to 2MHz. They are composed of two different double cavity filters and two hybrid couplers, including narrowband and wideband input lines. Low figures of frequency channels separation and high RF power, will be designed on request by our technical department.

 

We Bring You These in This Page

 

What You Need to Know About 24kW Digital VHF CIB Combiner

Electrical Index of FMUSER 24kW VHF CIB Combiner (Reference Only)

Two Reasons Why RF Combiner is Used

Why My RF combiner Stop Working

Four Extra Reasons to Explain Why Your RF Combiner Stop Working

What is Multiplexing and How it Works

 

Electrical Index of FMUSER 24kW VHF CIB Combiner (Reference Only)

 

  • Copper, silver-plated brass, and high-quality aluminum alloy
  • 6-cavity filters
  • High-frequency selectivity
  • Low insertion loss and VSWR
  • High isolation
  • Compact design
  • Convenient for multi-frequency integration
  • The tailored design, multi-structure, and power combination

 

Model

Digital VHF Combiner

Configuration

CIB

Frequency Range

167 - 223 MHz

Min. Frequency Spacing

0

Narrowband input

Max. Input Power

6 kW

VSWR

≤ 1.1

Insertion loss


f0

≤ 0.30 dB

f0±3.8MHz

≤ 0.40 dB

f0±4.2MHz

≥ 4 dB

f0±6MHz

≥ 35 dB

f0±12MHz

≥ 40 dB

NB to WB isolation

≥ 35 dB

Wideband input

Max. Input Power

18 kW

VSWR

≤ 1.1

Insertion loss

≤ 0.1 dB

WB to NB isolation

≥ 50 dB

Connectors

3 5/8"

Number of cavities

6

Dimensions

1530 × 870 × 730 mm

Weight

~ 165 kg

 

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Two Reasons Why RF Combiner is Used

Shortage of prime locations

 

As populations migrate to the suburbs, it has become more desirable to construct large broadcasting facilities which can reach these heavily populated areas from more central locations. Of course, these prime locations have become more valuable, so it makes sense to use each location to its fullest potential. This can best be done by sharing a transmitter site and a common antenna among several users. To accomplish this, the broadcast industry uses combiners of various types and sizes. For example, in San Francisco (Mt. Sutro), Toronto (CN Tower), Montreal (Mt. Royal), New York City (Empire State Building), and Chicago (John Hancock and Sears Buildings), tall towers or towers on skyscrapers have been used to consolidate as many broadcasting facilities as possible, including VHF-TV, UHF-TV, FM and land mobile communications services. This approach has proven very effective, not only using real estate economically but also spreading the tower costs over many users.

Group ownership of FM stations in a market has led to a proliferation of combined stations. And with the implementation of DTV systems, FM stations are being forced off existing towers, making it even more imperative that they share tower space, which increases the demand for combined systems.

 

The Requirements of FCC Isolation 

 

When more than one signal is broadcast over a single antenna, the signals must be combined in such a way that no chance exists for the signals to feedback into each other’s transmitters. Failure to do so would allow intermodulation products to be generated within the final amplifier stages of the transmitters and broadcast over the antenna. These in-  intermodulation products are generally referred to as “spurs.” Spurs created between FM stations can occur not only in the  FM band but also within the low band VHF channels and above the FM band causing interference to the aviation band.  In addition, FCC Rule 73.317(d) specifies that spurs more than G00 kHz removed from the carrier must be attenuated below the carrier frequency by 80 dB or by 43 + 10log10 (power in watts) dB, whichever is less. In practice, stations operating transmitter output powers of 5 kW or greater must usually meet the 80 dB requirement, while stations running lower TPOs (transmitter power outputs) fall under the computational method.

 

Experience has shown that to prevent spurs, each transmitter must be isolated from all others in the system by a minimum of 40 dB, with 4G to 50 dB ensuring regulatory compliance. Spur attenuation is accomplished by a combination of transmitter turn-around loss and filtering. Turn-around losses are inherent to the way spurs are created in the transmitter.  These losses typically run in the G-13 dB range for tube-type transmitters, while 15-25 dB is typical for solid-state units.  An off-frequency signal is attenuated 40 dB as it passes through the bandpass filters of the combiner module toward the transmitter with the spur it creates exiting the transmitter an additional G-25 dB below the level the signal entered. This spur is then attenuated 40 dB as it passes back through the bandpass filters. The result is spur attenuation of at least  80 dB, with 100 dB or more possible.

 

In today's world, the combiner has become an important part of the broadcast chain. It is important to realize it's technical and complexity. According to the advantages and disadvantages of the assembly, the system designer needs to choose specific applications. Correctly installed and correct tuning assemblies pass your signal to the far-stayed audience, and improper use of crosses can lead to reflections, resulting in poor health of the transmitter. 

 

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Why My RF combiner Stop Working

 

After years of continuous testing by the FMUSER technical team, we found that the common fault of the multiplexer is that the absorption resistance is burnt out.

 

In some bad weather environments (such as thunderstorms), the feeder system of the combiner is more vulnerable to the impact of lightning. At this time, the RF combiner is exposed to thunder, it may stop working, along with the burnout of multiple branch feeders. Several transmitters may have excessive reflection and high voltage drop, and the absorption resistance may also be burned out. The most effective solution is to replace the absorption resistor.

 

It is worth noting that there are different reasons to explain why your RF combiner stop working, which requires the RF technicians to treat it differently and remove the fault. Pay attention when the feeder fails or the reflection of the transmitter increases. Please check for times whether the RF combiner has abnormal temperature rise and whether the absorption load resistance is normal.

 

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Four Extra Reasons to Explain Why Your RF Combiner Stop Working

 

During the routine maintenance, we also found that the absorption resistance was damaged and the resistance value became larger. In the middle of the work, we did not find that the transmitter reflected too much or dropped high voltage, and the VSWR of the antenna feeder was also normal. This has happened several times. After careful analysis, it is believed that the reasons may be various. The result is as follows.

 

  1. If the antenna feeder is abnormal, it will affect the working of the RF combiner. For example, the insulation resistance of the main feeder may become smaller; bad weather such as rain and snow will bring an instantaneous short circuit, open circuit, and a worse standing wave ratio to the antenna, all these factors will make some power reflect back.
  2. The index of the RF combiner becomes worse, the isolation of the 3dB directional coupler becomes low, and the bandpass filter becomes wide. According to the common principle, we know that there will be some leakage at the isolation end of the 3dB directional coupler, and it is impossible for the bandpass filter to reflect the out-of-band signal completely. When the power to the isolation end is so big as to exceeds the rated power of the absorption load, the temperature of the absorption load will rise and burn out finally.
  3. If the modulation is too large, the bandwidth of the RF signal becomes larger, and the power leaked to the absorption resistor increases. The transmitter exciter is generally not limited, and the early modulation system is often more than 130%.
  4. Some power will be transferred to the absorbing load due to the resonance frequency offset of the band-pass filter, carrier frequency offset of the transmitter, impedance mismatch between RF combiner and antenna, etc.

 

Advice from FMUSER: the damage of the absorption resistance may be caused by one or more reasons. If the absorption resistance is not replaced in time, the power borne by the absorption resistor will be reflected in the transmitter, which will cause greater harm.

 

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What is Multiplexing and How it Works

 

The Passageway of Multiplexing RF Signals - RF Multiplexer

 

A multiplexer is a device that allows digital information from several sources to be routed onto a single line for transmission to a single destination. A demultiplexer does the reverse operation of multiplexing. It takes digital information from a single line and distributes it to a given number of output lines.

 

Multiplexing is the process of transmitting information from more than one source to a single signal by shared media. In any communication system that is either digital or analog, we need a communication channel for transmission. This channel can be a wired or a wireless link. It is not practical to allocate individual channels for each user.

 

Therefore a group of signals is combined together and sent over a common channel. For this we use multiplexers.  We can multiplex simulations or digital signals. If an analog signal is multiplexed, this type of multiplexer is called an analog multiplexer. If the digital signal is multiplexed, this type of multiplexer is called a digital multiplexer.

 

Why RF Multiplexer is important?

 

We can transfer a large number of signals to a single medium. The channel can be a physical medium such as a shaft cable, a metal conductor, or a wireless link, and a plurality of signals must be processed once.

 

Therefore, the transfer cost can be reduced. Even if the transmission occurs on the same channel, they do not necessarily happen at the same time. Typically, multiplexing is a technique in which multiple message signals are combined into a composite signal so that these message signals can be transmitted on the common channel.

 

In order to transmit various signals on the same channel, the signal must be separated to avoid interference between them, and then they can easily separate them at the receiving end.

 

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