BX-817 : Dynamic Compressor kit V3.0 for FT-817/818

Image of completed kit.Image of completed kit.

Easy to build external Dynamic Compressor especially for the Yaesu FT-817/818, but can also be used for other transceivers with the same microphone interface such as the FT-857, FT-897 or FT-900.

When transmitting SSB, dynamic compressor increases average transmitted power, and thus the audibility of a weak signal at the distant receiver, by at least one S-unit. This accessory is of special interest to amateur radio operators who work with lower transmitting power or wish to be better heard in a pile-up.

Based on SSM2167 (Analog Devices)

PCB with all SMD parts preassembled.

Powered over RJ45 cable (10 mA), no power supply or battery required.

$45.00 includes shipping and handling


New charge of kits available presumably mid September 2018.


MP3 file with two CQ calls during a summer thunderstorm situation. First call made without compressor, the second with the compressor turned on.

Dual language (english / german) construction and user manual.


Product reviews

If you are not from the United States, Canada, Japan, Australia or New Zealand you can order this item via our main online store at https://www.box73.de instead.