Re: Ubitx microphony
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Most likely the torroid chokes.. Hot melt glue or wax them in place. 73 de Mike
On Thursday, December 20, 2018, 11:01:00 a.m. GMT-5, Peter Russell <peter.russell@...> wrote:
When I say "microphony" I mean that the circuit boards are acting as a microphone - any slight tap on the case can be heard loudly in the phones. I haven't tried it on transmit yet, so I don't know whether it will be a problem there also. I'm sure I've seen reference to it somewhere but I'm not sure where. Any ideas will be welcome. Peter. G8FWY On 20/12/2018 15:05, iz oos wrote:
> What do you mean exactly with 'bit' of microphone? If you refer to low > average SSB output, I replaced to add another resistor (47ohm)in > parallel to R63 and worked nicely. However late November Barry Underwood > suggested to use a VOGAD. So I have just made (I still need to test it) > another external box with that compressor to use also with other SSB > QRPs, like ILER. I have a mil surplus radio that use the VOGAD and I > have always been impressed by it, as you can just whisper and have a lot > of output. See the attached file made by Barry. > > > Il 20/dic/2018 12:35, "Peter Russell" <peter.russell@... > <mailto:peter.russell@...>> ha scritto: > >? ? Hello from a newbie! >? ? I've just completed the build of my uBITX and I have to say, I'm >? ? impressed! >? ? Just one little niggle - and I'm sure I've seen it mentioned >? ? somewhere but I can't remember where - I seem to have a bit of >? ? microphony. Can anyone point me in the right direction? >? ? Thanks. >? ? Peter, G8FWY. > >? ? --- >? ? This email has been checked for viruses by AVG. >? ? > > > > > |
VE3MIC