Speech Compressor for FT-817, 818

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Speech Compressor - unleash your DX potential

Version 3 replaces the obsolete SSM2165 compressor chip with the improved SSM2167

***apparent improvement can be up to 6dB!***

Available ready-built or as as an easy-to build kit. Build time approx 40 minutes

817に効きます! その差は歴然。JH4DUQ - via Twitter

The FT-817 FT-818 is a great radio but the SSB speech power does lack "punch". This great little external AF dynamic compressor from Germany Box 73 will aid readability and maximise the performance of your radio (essential when using QRP). Speech Compressors work by raising the average level of your audio signal, giving greater "talk power".

Plug and Play! Connects between the radio and microphone (lead included). The compressor function can be switched in or out, the module draws its power directly from the transceiver (approx. 10mA). The compression level is adjustable. Modifications to the microphone or transceiver are not required.

Click here for instructions.

The compressor is also suitable for use with the FT-900, FT-857, FT-897 and FT-450 (all versions)

Note: Speech Compression is not recommended for use on FM. 

Also available from: 

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38 Reviews Hide Reviews Show Reviews

  • 5
    Speech Compressor for FT-817,818.

    Posted by Les Virgo on 3rd Dec 2018

    I recently purchased the Speech Compressor kit to use with my FT817nd. After a lack of spare time I assembled the kit & performed the suggested checks, all OK. I used the Compressor for the first time during the VKFF team championships & received very good reports. I have since used it during more activations both QRP & with my 45 watt linear amp. This is a keeper & I highly recommend it.

  • 5
    ssb on ft-817

    Posted by Aleksander Jensen on 29th Nov 2018

    The ssb mode is really kicking with this smal but effective compressor.

  • 5
    SB Speech compressor for Yaesu FT8*7

    Posted by William Sefton on 21st Nov 2018

    Makes one HUGE difference. Used mine in the CQWW SSB contest, and worked some nice DX (for a QRP SSB station) Well worth the money, and highly recommended. Also used a Sotabeam linked dipole......what a combo....

  • 4
    FT-817 Speech Compressor Kit

    Posted by Derek G1ZJQ/P on 11th Sep 2018

    Easy to assemble and worked fine without tweaking the pots from their 50% setting. Comments received on 2m SSB were that, while audio is sweeter without it, the difference in signal level is dramatic.

  • 5
    Gives your FT-81x the missing "punch" on SSB

    Posted by Mark Dammer on 27th Aug 2018

    Apart from a lot of advantages that made the FT-81x transceivers one of the classic QRP rigs, the lack of power on SSB is well known. This compressor makes SSB workable and gives the FT-81x the punch it needs.

  • 5
    Speech Compressor for FT-817ND/FT-818ND

    Posted by Gust ON6KE on 17th Aug 2018

    I had a 590 set-up with just a patch lead connected to it. A simple test but boy does it MAKE a difference transmitting on the 818ND with the processor on and off, a great deal of difference! It also feels as if the TX bandwidth is narrower with the processor in switched on.

  • 4
    speech compressor

    Posted by Thom Jonsen VE7CNA on 9th Aug 2018

    Works as specified, a good product at a reasonable cost.

  • 5
    Speech Compressor FT 817

    Posted by Clive Smith on 2nd Aug 2018

    I received the kit very quickly and the construction went well. When tried on test equipment the FT817 showed a reasonable increase in average power.. I am happy with the unit and will go with me on a trip to NZ.

  • 5
    Speech Compressor

    Posted by Ray carpenter on 19th Jul 2018

    I got my speech compressor for ft817nd this morning over the moon with it thanks