PM series FM transmitters
The PM series transmitters/exciters are designed to operate in the whole FM frequency range (87.5 - 108 MHz) as stand-alone transmitter or versatile exciter for high power amplifiers. The RF output power is continuously adjustable from 0 to 300W (PM 300), 500W (PM 500) or 1000W (PM 1000).
- Low dimensions and weight. Designed to fit into space limited facilities, PM series units feature one of smallest dimensions and weight in the industry, simplifying transport, installation and maintenance.
- COLD-FET™ technology. This technology is used in the PM series transmitters to optimize the MOSFET’s output matching in order to obtain broadband amplification stages without any RF component. This means:
- higher RF efficiency > 83%
- lower heating
- higher devices safety
- higher total reliability
- low AC power consumption
- MOSFETs Safety. The COLD-FET™ technology permits to obtain from the PA the full power rating reducing of almost 15% the MOSFETs recommended operating DC voltage and current.
- Uninterrupted service. A true proportional foldback protection circuit keep the transmitters always on the air reducing the output power in case of:
- antenna VSWR
- environmental over-temperature
- failure in one or more amplification modules
- failure in one or more power supply modules
- Frequency-agile PM transmitters are fully broadband. All RF stages, including the output filters, can operate on any FM channel, selectable via a integrated digital selector.
- Automatic power control circuit maintains constant RF output with precision (±1%).
- Advanced controller provides full front panel transmitter control capabilities and extensive metering of individual modules. Standard or special remote control interface is also available.
- Power supply. A rugged, high-efficiency (> 93%) power supply, protected from incoming AC line overvoltage, overcurrent, transient and lightning and equipped with PFC circuit assures to the PM transmitters/exciters very high reliability and very low consumption.
- Cooling: an oversized low noise air cooling system with internal fans extends transistors life.
- Low overheating. Thanks to the high RF efficiency, due to COLD-FET technology, the heatsink overheating respect to the environmental temperature is limited at + 10°C only. This permits to operate also in hard climatic conditions.
- Low AC power consumption. The high overall efficiency means a reduction of AC power consumption and operating costs.
- Meets or exceeds international standards for safety and electrical specifications.
