Tnx, Oh, I see, you calibrate the tuning dial by using the Xtal as a reference
knowing it is at the stated Xtal frequency when the magic eye peaks. I assume you
use the little knob next to the dial for this tweaking? or do you loosen the dial
and re-set it according to this calibration?

Bill K6TAJ

Dbowey wrote:

Bill posted:

Someone gave me an old ARC 5 (7-9.1) transmitter found at the county
dump. I would like to see if I can get it going on 40 meter CW. I have
found some information online, namely a schematic and an article for
"converting to Amateur use". I realize this is a crap shoot, but I
think it would be fun trying. I am trying to verify the wiring
according to this old schematic knowing that so many units have been
hacked into over the years. I have put together a power supply along
the lines of the reprinted "converting" article available at the ARRL
website. The Xtal in this unit is 8870 KC. Is this OK? How does this
Xtal function in this otherwise VFO unit, and what determines the
frequency that was chosen for this xtal? Other information or sources
of information would be welcome. Anyone else have any luck with these
things? Any recommendations?


You should not have any strange problems getting it running. The xtal was
selected for each mission. The crystal is used as a reference for setting the
VFO frequency. In the check position, the VFO and crystal oscillator are both
on, and when the vfo comes close to the crystal freq you will see the affect on
the tuning eye.

Have a ball.

Don