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Atlas 210x - external VFO help

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Andreas Weller

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Aug 25, 2002, 11:07:02 AM8/25/02
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Hallo!

One of my friends owns an old "Atlas 210x". Now he wants to use it as his
"digital modes Transceiver" because the receivers spectrum is very linear.
But it has a terrible frequency drift problem.
Now he remembered that there is a connector for an external VFO at his
radio's rear. His idea is that there must be a way to stabilize the radio on
the frequency - for example 14.070 for PSK31. May be with a little circuit
using crystals, etc...

Do you have any ideas about how to do this? Schematics? Or something that
may help him...

Thank you very much!


73 de Andreas, DF1PAW


Andreas Weller

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Aug 26, 2002, 3:53:48 AM8/26/02
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Additional Info:

We just found http://www.hamanuals.com/MMans/ATLS10XB.pdf where you can see
the original schematics of the external crystal oscilator. Do you think it's
possible to replace this circuit with a PLL?

Any Ideas about that?


73 de Andreas, DF1PAW


Richard Hosking

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Aug 26, 2002, 11:09:33 AM8/26/02
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You try my freq counter/stabilizer at
http://members.iinet.net.au/~richardh/vfostab.htm

This will stabilize the VFO if it drifts less than about 5 KHz and provide a
freq readout.

Richard
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"Andreas Weller" <wel...@andreas-weller.de> wrote in message
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Richard Hosking

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Aug 26, 2002, 7:48:33 PM8/26/02
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Let me rephrase that
> You *might* try my freq counter/stabilizer at
> http://members.iinet.net.au/~richardh/vfostab.htm
>
Richard

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J M Noeding

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Aug 27, 2002, 2:26:35 PM8/27/02
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could you just repeat the first URL, couldn't decode the information
(http://www.hamanuals.com/MMans/ATLS10XB.pdf)

73
Jan-Martin

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chuck & shirley hawks

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Aug 27, 2002, 3:00:53 PM8/27/02
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I went to the home page of hammanuals.com and followed the link for manuals
online. The mentioned pdf file is for the noise blanker only.

I have a 210X and found the manual and schematics at the following site.
Also the Atlas 210X-215X news group at Yahoo.com has the same info.

Hope this is of help

Chuck
KE4ETH

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