Mike,
It has been a long time, but I believe I put a product detector mod on
mine.
There were many published circuits around at the time for doing this mod.
One thing I wanted to add was frequency accuracy. If the R390A was
perfectly calibrated you could read vernier scale on the right hand side of
the digital turns counter to about 200 hertz accuracy. This was the
absolute best you could hope for. The RX340 reads to 1 hertz and in good
calibration is probably always within 3 to 5 hertz accuracy.
Carl Moreschi N4PY
Franklinton, NC
> ----- Original Message -----
> From: "Mike Manship" <w9oj@peoplepc.com>
> To: <tentec@contesting.com>
> Sent: Thursday, January 23, 2003 10:48 PM
> Subject: Re: [TenTec] Perspective on Collins R390A
>
>
> > At 08:36 PM 1/23/03 -0000, Carl Moreschi wrote:
> > >The R390A did very well in it's day. It was one of the most accurate
and
> > >stable receivers of its time with excellent mechanical filters. It
> played
> > >real well on AM, SSB, and CW.
> >
> > Didn't the R390A require an external SSB adapter to become a "real"
> > SSB receiver (selectable sideband and a product detector) ?
> >
> > 73 de Mike W9OJ
> >
> >
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>
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