[R-390] Product detector rocks - USB/LSB rocks

[John Kolb]

Well, $35 a pair isn't much better than $20 each for the 453.5 and 456.5
at INRAD, although the 453.6 and 456.3 would be a better match
to the 2.0 kHz filter of the R-390.

This isn't an application that requires xtal stability - I'd
go for either two LC tuned circuits - this would let you adjust
the BFO freq relative to the mech filter edge to get the voice
sound you prefer - or a large BFO tuning knob like onthe CV-591,
with an adjustable oscillator circuit tuning 455 +/- 3 kHz.

I've got some 455.0 kHz xtals if anyone has need of one.
Work great if you have a matched pair of LSB/USB mechanical
filters.

John

On Mon, 30 Sep 2002, Rodney Bunt wrote:

> Alex,
>
> I contacted "International Radio" people who quoted prices for two rocks at $35 plus postage, BUT
> they said they made a minimum of 10 rocks at a time, and I would have to buy them all, as they had
> no use for 45xkHz rocks. So $350 for them is a bit excessive.
>
> Any interest from 9 other SSB / product detector enthusiasts out there ???
>
> Rodney
> VK2KTZ
>
> --- AI2Q Alex <ai2q@adelphia.net> wrote:
> > Hey listers!  Any of you wishing to dupe my product detector can now
> > apparently acquire the requisite rocks, brand new, at
> > http://www.qth.com/inrad/home.htm
> >
> > My circuit can be found at http://pdq.com/boatanchors/ssb/ as well as
> > http://fly.hiwaay.net/~wb7vdn/Download.htm
> >
> > Vy 73, AI2Q, Alex in Maine   .-.-.
> >
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>
>
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