SB-102 weak modulation

[Eddy Swynar]

Hi Aatos,

Is the low audio on one specific sideband, i.e. USB, or LSB...or both?

If it's just the one, suspect the carrier generating crystal for that
particular sideband---if it's off by much, the bulk of your signal could be
outside the bandpass of the crystal filter,

Those old Heath HC-6U crystals are rather notorious for changing frequency
over time. My former SB-400, after a long off-the-air absence, developed
weak, tinny-sounding audio on LSB---turns out that the LSB generator crystal
had, indeed, changed with age. A replacement crystal brought it back to life
in that mode...

~73~ Eddy VE3CUI - VE3XZ




----- Original Message -----
From: "oh8jep" <apo at kotinet.com>
To: <HEATH at LISTSERV.TEMPE.GOV>
Sent: Thursday, February 20, 2003 11:54 AM
Subject: SB-102 weak modulation


> Hello!
>
> I took my oldie SB-102 in use after some years "sleep" ,seems work quite
well,but found
> some little problems with the modulation level. Mic is OK. Is there some
well known fault which
> can appear after years when not used for a long time,some modulation
specified problem,some component fault
> maybe? Any ideas,all the help is very welcom,does anyone know how can I
increase modulation level?
>
> 73 de Aatos OH8JEP
>
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