[1000mp] Low audio to sound card

Sat, 14 Sep 2002 06:05:29 -0000

Glenn:

There was also an audio board mod for the MP--maybe for the Mk. V also. It
replaces two chip feedback resistors in a stereo power op amp. Added only
about 3 dB. You can get this from Yaesu, but it is fairly obvious if you
have a shop manual.

Garry, NI6T

> -----Original Message-----
> From: [email protected]
> [mailto:[email protected]]On Behalf Of Glenn Rattmann
> Sent: Friday, September 13, 2002 20:03
> To: [email protected]
> Subject: Re: [1000mp] Low audio to sound card
>
>
> At 03:24 PM 9/13/2002 -0400, you wrote:
>
> >Is the mismatch between the 4-8 ohm headphone output of the Mark
> 5 and the
> >isolation transformer simply too large, and that is the source of the
> >problem?� In that case, I could add a small 8:600 ohm transformer to
> >provide a better match.� Or should I be looking somewhere else for the
> >solution to the problem?
>
> Hi Pete,
> I can't answer your specific question but I have a related one
> which maybe you
> have already confronted.  I have an "older" Heil ProSet and the
> earphone audio
> is way low out of my Mark V.  It was perfect with my old TS-940S.
>
> I'm wondering if maybe something like the 8:600 ohm transformer
> you mentioned
> might help; I could mount it externally in a little box with 1/4" jack,
> etc.  I
> seem to remember hearing something about the newer Heils being
> better, but not
> sure.  Are the older ones higher impedance?
>
> I think someone, not me, said once that they mentioned the
> problem to Heil and
> Bob just flew off yelling about lousy designers at Yaesu, etc.
> etc.  Sheesh.
>
> Thanks,
> Glenn K6NA
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