Heathkit SB-102 LSB problem

[Ed Swynar]

Al,

For whatever reason, those HC-6U crystals used in the "SB" line can---and
DO!---change frequency over time...

If the audio sounds tinny on only ONE sideband (i.e. either upper, or
lower), cast suspicions onto the appropriate sideband generating
crystal...if the frequency calibration (i.e. zero set) has "...gone south"
on any band(s), suspect the heterodyne crystal for that band(s).

You can readily confirm the EXACT frequency of any of those crystals by
using a short piece of wire as an antenna, placed next to the crystal in
question. Hook the other end to the antenna terminal of a good, calibrated,
digital read-out receiver with general coverage. Then COMPARE what the
receiver says at zero beat to what's stamped on the crystal.

If there is a significant difference between the two, I'm afraid it's time
to give JAN Crystals in Fort Myers a buzz...

Good luck, &

~73!~ Eddy VE3CUI - VE3XZ






----- Original Message -----
From: "Schichler, Alfred" <ASchichler at MICROWAVEDATA.COM>
To: <HEATH at LISTSERV.TEMPE.GOV>
Sent: Monday, November 22, 2004 9:29 AM
Subject: Re: Heathkit SB-102 LSB problem


> I have a similar problem with my SB-301. It's not very severe, but the
audio
> sounds more tinny on one sideband than it does on the other. I was
wondering
> if there are any articles about fixing this or similar problems with the
> SB-301.
>
> Thanks,
> Al Schichler
>
>
>
> -----Original Message-----
> From: Mark Graalman WB8JKR [mailto:wb8jkr at JUNO.COM]
> Sent: Friday, November 19, 2004 11:15 AM
> To: HEATH at LISTSERV.TEMPE.GOV
> Subject: Re: Heathkit SB-102 LSB problem
>
>
>  You should see NO signal at the plate of V16
> the plate is grounded for RF. The BFO output
> is taken from the cathode and in LSB you should
> see about 3396.6 Khz. As little as a 50 hz shift
> of both crystals can cause a noticable difference
> in the audio passband response. If you can I
> suggest reading the article on optimizing the
> SB/HW series transceivers in the Feb 2003
> QST, if you don't have access to it I can E mail
> you a .PDF file of it.
>
> 73,  Mark WB8JKR
>
>
> On Fri, 19 Nov 2004 13:16:07 +0000 dmurman at VERIZON.NET writes:
> > I have picked up a Heath SB-102 transceiver and noticed that the LSB
> > sounds real tinny.  I suspect it is the LSB crystal.  What frequency
> > should I see at the plate of V16B.  Would that be the crystal
> > frequency?
> >
> > USB sounds A-OK.
> >
> >
> >
> > Thanks;
> > David
> > WA4ECM
>
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