[hpsdr] Pentalope audio

[a.groff]

Upon further review,  it appears that the noise problem may not be a 
noise problem but a metering problem....

A 10db change in mic input level ( measured externally ) produces a 3db 
change on the TX mic meter. !!   
So it looks like its going to be by-guess and by-gosh on the mic level 
adjustments for now....

Al, K0VM



> (SW: PSDR TFD 10 Jan, Mercury V2.4, WInXP sp3; HW: Mercury, Pentalope, 
> Ozy )
>
> There seems to be a high noise level in the pentalope audio system. In 
> L/USB, AM modes and no mic plugged in, the TX Mic meter reads in the 
> range of -20 to -25db when PSDR MOX is keyed.  With MON on, the noise 
> sounds like a mix of crackling white noise and unstable audio tones.  
> Enabling the audio gate kills the noise as does enabling VAC.   The 
> noise is present on the external TX RF output meter about 25-30 db 
> below peak output and is visable on then TX Panadaptor.
>
> The noise reminds me a bit of noises that in past time I traced to bad 
> solder joints or over stressed/reversed polarized capacitors.
>
> Does/has anyone else seen this characteristic ?    Is there some setup 
> that I have missed ?
>
> AL, K0VM

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