Amateur Radio 4m High Power 300W Amplifier Kit

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New for 2021 is our 4m 300W high power amplifier kit. This kit uses the same PCB as our popular 2m kit and has been retuned for optimum performance on the 70MHz band. Using one of the new generation, highly rugged RF mosfet transistors at its core, the design has several features not offered by o ...Read more
£ 159.99 each
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New for 2021 is our 4m 300W high power amplifier kit. This kit uses the same PCB as our popular 2m kit and has been retuned for optimum performance on the 70MHz band.

Using one of the new generation, highly rugged RF mosfet transistors at its core, the design has several features not offered by other similar products.

Supplied with comprehensive instructions including clear assembly photos, assembly will take around 2-3 hours for the intermediate level constructor.

The kit does not come with heatsink, but we recommend either the Enigma HS150 or HS200 which should be purchased in addition to the kit of parts if you do not have a suitable heatsink available. A heatsink with a thermal resistance of at least 1.2º/W is recommended. 

Also available fully assembled and tested here.

Features:

-Partially assembled kit supplied with high quality PCB

-Mixed use of through-hole and SMT parts. All SMT parts already professionally mounted

-High quality components used throughout

-Latest high-ruggedness MRFE6VP6300H RF mosfet

-High efficiency design

-Broadband, requires no tuning

-On-board low pass filter. Excellent spectral purity

-Temperature compensated bias with external shutdown pins to save power

-On-board directional coupler and precision thermistor for SWR and temperature monitoring

-Suitable for FM & SSB

Specifications:

-Power Gain:  >22.5dB @48V/ 150mA bias (1.5W input required for >300W output)

-Efficiency: Approx. 75% @330W/ 48V (FM mode)

-Harmonic output: <-70dBc, 65-75MHz

-Current draw: Typical 9A at 48V

-Suitable for FM and SSB

-Mismatch ruggedness: >SWR 65:1. Tested into open and short circuit loads at the output without damage.

-Size: 150 (L) x 75 (W) x 35 (H)mm (Completed PCB)

150 (L) x 100 (W) x 75 (H)mm (mounted on Enigma HS150 heatsink).

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 for PTT (dual mode, either ground or +5-12V input to disable bias)

-LED indicators for +50V Supply and PTT bias on. 

-Supplied with full instructions & technical support via email. 

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