need some sb102 magic

[Steve & Anne Ray]

I had a similar problem a number of years ago on my HW-101.  It would work
fine on AM signals (CHU Canada is USB with a carrier), but distort on SSB.
Looking in my notes I found that I had replaced RFC 101 at V13C in the
product detector to cure the problem.  Check the voltages around V13C to see
if they are correct.

73,
Steve Ray K4JPN ex K1VKW HW-101, HW-8, OHR-100A, SWL 30-40 and NC 38S
HeathKit fan
Warner Robins GA EM82fp




----- Original Message -----
From: mike bryce <prosolar at SSSNET.COM>
Sent: Monday, March 27, 2000 1:43 PM
Subject: need some sb102 magic


> Hola..
>
> I have brought back from the brink of death a sb102.. Everything
> works..sorta. here's da poop!
>
> on receive, the signals seem to be distorted. Either usb or lsb. I can't
> tell if the CW is distorted. The cal signal does not sound correct either.
> this problem in on all bands.
>
> the transmit audio seems to be just fine.
>
> I found that by reducing the rf gain control the distortion clears up.
>
> yes, the avc is working, with no signals the avc line rests at about -1
> volt. with strong signals the avc goes up to -5 or so volts. The rf gain
> control is also able to move the avc voltage.
>
> this radio has been retubed with nos tubes.
>
> the problem is before the audio stages. I took a external audio amplifier
> and picked off the audio before it went to the audio power amplifier.
still
> screwed up.
>
> I have also replaced the 2.1 khz filter. The two crystals in the carrier
> oscillator are  new, too.
>
> so, any ideas? The only other bug this rig has is no grid drive is
displayed
> on the meter. It transmits ok, but the major problem is the distorted
audio
> on receive.
> --
>
>
> Mike Bryce, wb8vge
> SunLight Energy Systems
> "Electricity at the speed of light"
>

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