Micro Communications offers a complete range of broadcast RF switches and switching accessories in coaxial and waveguide configurations. Our broadcast RF transfer switches are offered from DIN 7-16 up to 6 – 1/8″ coaxial. Our waveguide configurations are available from WR-62 up to WR-2300+. For accessories, we offer a range of switch control panels, programmable switch controllers and N+1 switching matrix.
High-Power Switching Combiner Systems
The MCI high power switching combiner module permits the parallel combined operation of two transmitters or the use of either one singly in an emergency. This operation can be accomplished by computer control, hard-wired logic or local manual selection.
In the normal combined mode of operation, the outputs of both transmitters are fed to the two inputs of a 90° hybrid combiner. The combined signal can then be fed to the diplexer or station load. If either transmitter should fail, switches A and B (see schematic) can be automatically actuated so that the transmitter outputs are connected directly to the inputs of switch C. Switch C, again automatically, selects the active transmitter to be connected to the diplexers and simultaneously connects the failed transmitter to a dummy load.
Manual override of the high power switch positions permits routine checks of system performance during off-air hours. The system includes a hybrid combiner, three coaxial switches, and elbow and RF probe (on the dumping load port) and the mounting frame. The air or water cooled dumping load is not included but can be supplied.
- Combines Outputs of Two Parallel Transmitters
- Allows Combiner Bypassing with Failure of One Transmitter
- Switches Either Transmitter to Diplexer or to Load
- Compatible with Computer Control
- Manual Override
N + 1 Switching Matrix
MCI’s N + 1 Switching Matrix is designed to allow a standby transmitter to be used in place of any number of main transmitters. A path to a test load is provided so that any of the inputs can be fed directly to the load. Commonly used in FM multi-station sites, where a tunable FM transmitter is provided as backup, should one of the main transmitters fail. Applications for VHF and UHF are also available.
The matrix consists of motorized coax switches interconnected to each other using rigid line components. The switching modes are controlled with MCI’s “Micro-Switcher” microprocessor based controller that requires a dry contact closure to activate the mode switching. The N + 1 is available in standard EIA coax sizes.
Product Highlights:
- Compact Size
- Standard EIA sizes
- Microprocessor Controlled
- Quick installation
Options available:
- Wattmeter
- Couplers
- Fine Matchers
- Test Load
Specifications
| VSWR | 1.02 to 1.08 (based on frequency) |
| Frequency | Specify channels of use |
| Insertion Loss | 0.20 dB max (0.10 dB typical) |
| Input Isolation | 40 to 60 dB (based on frequency) |
| Impedance | 50 ohms |
| Connections | Standard EIA coaxial |
Broadcast RF Switches: “Micro-Switcher”
To learn more about our Broadcast RF Switches, Systems or Accessories – or to learn about our capabilities specific to broadcast – contact us at sales@microwavetechniques.com! We look forward to partnering on your RF project!
