Speech Compressor - unleash your DX potential
***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.
The compressor is also suitable for use with the FT-900, FT-857, FT-897 and FT-450 (all versions)
Speech compression is not recommended for use on FM
Occasionally people have problems plugging their microphone into the compressor. This is because the Yaesu microphones are fitted with an oversized rubber boot that shrouds the RJ45 connector. If the RJ45 connector does not click firmly into body of the speech compressor, gently retract the back rubber boot a few millimetres and the connector will engage properly (100% success rate!).
Also available from our international agent(s):
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52 Reviews Hide Reviews Show Reviews
Works as specified, a good product at a reasonable cost.
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.
I got my speech compressor for ft817nd this morning over the moon with it thanks
The compressor seems to working well. I would suggest better guidelines/help for the interactive adjustment with mic gain in the 817, mic level in the compressor and compression level. There must be better guideline available for a standard step by step procedure. The case would be improved with two small holes suitable for a jewllers screwdriver for pot adjustment without splitting ithe case. The plastic taps on the RJ-45 plugs on the interconnect cable are very susceptible to damage and should be protected, they are a weak link in the design. Other than that, first reports are good and I am optomistic.
Brilliant little gizmo makes my 5 watts seem more
it is nessesary if you don’t want to keep your voice ...loud...it is useful ..
Great product, easy to construct and easy to use.
Gave me plus Two "S" Points in use.
Works well, does what it says on tin, only thing did find was using a local mini loop there was a slight increase in background noise on 7MHz, but considering the aerial only 2 feet from rig and the unit is unscreened this would be expected.
This works well with the 817, 857 as I have both radio's and did see a lot of difference when in use.
I looked at several options for improving my signal on SSB. It seemed that some kind of speech processor add on was needed for my FT-817..
There are several options available from modifying your microphone or adding a circuit in the rig. I didn't feel comfortable with modifying my radio. The Sotabeams (inline) speech compressor looked to be the answer.
I ordered the Sotabeams speech compressor ,from England and it arrived at my QTH two weeks latter. It was easy to install, only requires plugging it in between the radio and microphone.
The first thing that was obvious, according to the power output meter on the 817, I was putting out more power. On air tests confirmed that I could be heard much better ,with the Speech Compressor making a big difference. It easily gave me the one S unit or better of improved signal as claimed.
My first few contacts gave me reports of some audio distortion and comments that I was driving the mic too hard. You need to remember (I forgot this in my hurry to test it out) to adjust the microphone audio level for use with the compressor! ) My normal mic setting without the compressor was 50. With the compressor inline, it works best set to 30.
I am happy with the Sotabeams compressor, it does what it says it will do and gives a better signal.