[R-390] 200KC calibration crystal source

[Phil M.]

I don't think this is exactly rocket science....but...

Remove the oven.  Take the 17 mc xtal out of the oven and solder
tube pins to it.  Insert this xtal in the socket so that it is between
pins 4 and 6.  Take a common 100 kc calibrator xtal, solder tube pins
to it, and insert it in the socket so that it is between pins 2 and 8.
Now you can have markers at each 50 kc point as well as each 100 kc
point.

73, Phil
W5BVB

----- Original Message ----- 
From: "Perry Sandeen" <sandeenpa at yahoo.com>
To: <r-390 at mailman.qth.net>
Sent: Thursday, March 29, 2007 12:20 PM
Subject: [R-390] 200KC calibration crystal source


> Gents,
>
> Wrote: 200KC calibration crystal source <snip>
>
> Perhaps a heretical solution is to build the marker generator in the ARRL 
> handbook (which is
> conveniently impossible to find rationally listed in the index).
>
> It has jumpers that allow the choice of several reference xtals or an 
> input from a high stability
> source.  Jumper selection can give a 200Khz signal.  I don't know if its 
> amplitude can be used as
> is or how one would couple it.  There is a PC board available.
>
> One advantage would be avoiding the 85C oven and its accelerating effects 
> on aging.
>
> Regards,
>
> Perrier - Who almost successfully removed his left thumb top on a table 
> saw cutting kindling wood.
> Six stitches really spoils your day and my limited typing ability.
>
>
>
>
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