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| Reviews Summary for DF4ZS RF speech processors |
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Reviews: 5
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Average rating: 4.6/5
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MSRP: $65-130
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Description: Increase average SSB power of radios without RF speech processing by up to 9 db without excessive distortions; smallest model fits into a microphone; make IC-706 or FT-100 sound like with a 400 W amplifier
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More info: http://jwm.de/afu/index0.htm
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PE1JLJ
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Rating: 5/5
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Aug 6, 2006 00:49
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cool, worthwhile to get processor for your MH-31
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Time owned: more than 12 months
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after paying,the PCB got lost in the mail and Joachim sent me another one.
The voice characteristics can be adjusted a little bit with a different condensator if you like, at the front. The speech processor gives quite some "punch" and you'll have to watch the ALC at first not to overdrive you set.
I found it very peasing to work with; compared to original mikes, it indeed gives you quite a few more contacts.
Thumbs UP !
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G4ZRZ
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Rating: 3/5
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Jul 8, 2004 12:40
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OK but not with supplied mic element
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Time owned: 3 to 6 months
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I've had one of these for a few months now. I have to say that it really helps to increase signal strength. However the downside is that audio quality just isn't very good.
To fit the unit you are required to remove the stock element and fit a small electret element. The claim is that this gives much better sounding audio. It doesn't. The new element has far too much treble and has a edgy sound. After processing this is even worse. At first I thought it was just my unit but after listening to the sound comparisons on the FT817 yahoo group I can see that it's the same for others (who seem happy with the sound).
On SSB much of the harshness isn't apparent but on FM it's awful even without the processor turned on. I've tried adjusting the mic gain but it's no good. Before I did this mod I was always receiving complements about my FM audio with the stock mike, not any more.
I'd love to hear what this unit sounds like with say a Heil HC5 as the element or even with the stock mike element but I'm about to convert my microphone back and try a W4RT one big punch.
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DL6XAZ
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Rating: 5/5
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Jul 8, 2004 08:31
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excellent
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Time owned: 6 to 12 months
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Ordered and installed on unit in the MH31 Yaesu mike for FT817 - the result was simply amazing! Reports indicated at least one more S-units and a very clear modulation.
Based on this positive experience I bought another one for the FT857, improved version, and the results are the same.
Highly recommended for especially QRP equipment!
Service and delivery, documentation and support far above standard!
vy73 Fred DL6XAZ
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WB6UQA
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Rating: 5/5
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Dec 3, 2002 21:53
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Alot of punch for A 706
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Time owned: 0 to 3 months
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I ordered this miniature RF prossesor from Germany.I was worried it wouldn't drive my Icom 706,but I was wrong.I do not have to close talk my mike anymore,pleanty of punch.It will fit in any mike case,about half the size of A book of matches.I get very good audio reports when I talk 9 or 10 inches away.For $63 it delivers alot of bang for the buck.
73's Gary
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NO9E
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Rating: 5/5
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Oct 10, 2002 10:50
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Good punch at bargain price
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Time owned: 0 to 3 months
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I ordered a minature speech processor from DF4ZS. It came in about 2 weeks. The unit generates a 455 KHz SSB signal, clips it, and converts back. Amazing size for what it does. It effectively makes a signal of cheap radios (like IC706, FT-100) sound like with 400 W amplifiers at a fraction of cost and labor.
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