300W FM Broadcast High Power Amplifier Module

The Enigma Broadcast PA108-300 FM power amplifier is perfect for professional or semi-professional radio stations wishing to increase the power of the their 87.5-108MHz broadcast exciter. 

With an output of 320-350W using an input drive of only 1.5W, this compact module has several novel features and excellent specifications.  The amplifier can also be driven with lower power 1W exciters at an increased supply voltage of 50V, where typically over 300W will be produced across the band.

Based around the design of our hugely successful amateur radio 300W amplifier modules, we have re-tuned and optimised this design for the 87-5-108MHz band, resulting in excellent performance. High efficiency exceeding 70% (typically 75%) and super low harmonics (always less than -70dBc) guarantee a clean, cool running amplifier which complies with international broadcast standards. 

The amplifier is supplied completely assembled and tested on a heatsink. For a finished product you will need an FM exciter, a case, a fan of at least 50cfm, 500W/ 48-50V power supply, coax cable and connectors.  You may also add a SWR or temperature protection circuit using the monitor outputs provided on the board. 

Features

• Fully assembled and tested amplifier building-block, no tuning or set-up required.
• High quality components used throughout.
• Latest high-ruggedness MRFE6VP6300H RF transistor.
• High efficiency design.
• Broadband, requires no tuning from 87.5-108MHz.
• On-board low pass filter. Harmonic output complies with international broadcast standards.
• On-board directional coupler and precision thermistor for SWR and temperature monitoring.
• Bias shutdown facility. 
• Temperature compensated mosfet bias.

Specifications

• Power Gain:  >23dB @48V/ 250mA bias (1.5W input required for >300W output).
• Efficiency: Approx. 75% @330W/ 48V (FM mode).
• Harmonic output: <-70dBc, 87.5-108MHz.
• Current draw: Typical 9A at 48V.
• Supplied tested and set-up for FM use.
• Mismatch ruggedness: >SWR 65:1. Tested into open and short circuit loads at the output without damage.
• Size: 200 (L) x 100 (W) x 75 (H)mm (mounted on Enigma HS200 heatsink). 
• Voltage outputs via an edge connector for thermal and SWR monitoring, suitable for connection to a microcontroller.
• Bias shutdown via edge connector for monitoring or protection.
• LED indicators for +50V Supply and bias on. 
• Supplied with a full test report, user manual & technical support via email. 

Disclaimer: This product is capable of providing strong RF output signals and is designed for educational projects and experimental use only. If you intend on connecting the PA108-300 to an antenna please be aware that it may not be licensable to do so in some countries. It is the user's responsibility to check local laws before applying power to the unit. Enigma Shop cannot be held responsible for misuse of this product and we reserve the right to refuse sale to those customers believed to be involved in illegal broadcasting.