[HBR] Quartz Crystal Oscillator

[Peter Bertini]

You can find a pair of  near 1685kHz
crystals in many half-lattice crystal filters,
as used in the Heathkit GR-54 and HR-10
receivers. Plenty of junker parts sets out
there.... the crystals will be a few kHz off
of 1685kHz, but they should work if you
are willing to move the IFs a bit.

Pete

On Thu, Aug 4, 2011 at 4:19 PM, John Landrigan <jlandrigan at pol.net> wrote:

> Now that I've gotten myself unconfused, here is what I am trying to do:
> The HBR 16 variant that I am building up has a High Frequency L/C
> oscillator which mixes with the antenna input into an RF amplifier. The
> output from the first mixer goes to a Millen 1600 KHz IF transformer. The
> next step is to take this output and mix it with the 2nd oscillator, using
> the crystal I have, 1710 KHz, and put that output into a Miller 100 KHz 2nd
> IF transformer. There are two subsequent IF amplifiers that use similar
> Miller 100 KHz IF transformers.
> Once I ever get that setup working, I would like to change things so that
> the output from the Millen 1600 KHz IF transformer mixes with a 455 KHz 2nd
> oscillator and IF transformer then into a crystal lattice filter, or into
> two subsequent 455 KHz IF amlifiers.
> The next grandiosity is to find a means to develop a 2nd oscillator that
> will mix so that an output will be made available to either an 85 KHz IF or
> 50 KHz IF. It seems like the finding of crystals specific for 1685 KHz and
> 1650 KHz is not going to happen in this lifetime. Therefore, some type of
> L/C circuit is going to be in order. I was thinking that the Russian 59 KHz
> quartz crystal oscillator tube might prove usable somewhere in this
> mish-mash of thinking out loud.
> John KA4RXP and Jody KG4VES
>
>
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