JAG RF stocks a wide range of combiners from hybrid to cavity-ferrite. Transmitter combiners are an important part in any large-scale multi-channel radio system from trunking to cellular. These multi-cavity apparatus’s are essential when system operators want to make the most efficient use of available frequency allocations and limit the number of antennas introduced into a given RF system. Transmitter combiners are particularly good at combining multiple transmitters onto a single antenna while minimizing interference between adjacent transmitters; therefore, minimizing intermodulation products.

Some RF combiner systems are designed to allow them to grow as needs change. JAG RF stocks many expandable combiner systems from manufacturers such as dB Products, TXRX, Davicom, and Sinclair. JAG RF refurbishes a lot of Sinclair ‘C’ series combiners in particular, as these combiners do not require critical length cables between channels. Although this style of combiner is convenient, there are two drawbacks, they take up a lot of space and sometimes require an entire room and they are very difficult to configure for closely spaced channels.

When size is an issue, compact combiners are the solution to space constrained sites. These combiners are very good at combining closely spaced transmitters when tuned properly. However, they are a little more difficult to expand for additional channels, which usually requires major adjustment of all critical length cables. For frequency allocations as close as 250 kHz, these combiners will do the job; however, the FCC and Industry Canada are know to allocate no ideal frequency assignments that are sometimes extremely close together.

For extremely close frequency assignments up to 75 kHz, larger round cavity ferrite combiners are the best solution. Although these combiners are big and bulky, they are often the best compromise for low loss combining coupled with closely space channels. If the FCC or Industry Canada take your frequency allocations a step further and put them virtually on top of one another, your only choice will be hybrid combiners in most cases, which produce very high insertion loss. JAG RF can provide both types of combiners and can customize them to suit any customer’s specific needs.