[AMRadio] Sonar FS-23 to 10 Meter AM

[Mike Duke, K5XU]

As I recall from my CB days in the 1960's, the FS23 had some of the 
best sounding audio on 11 meters. The conversion won't do anything to 
change that.

----- Original Message ----- 
From: "Byron Tatum" <bjtatum1 at att.net>
To: <amradio at mailman.qth.net>
Sent: Thursday, April 19, 2012 10:57 AM
Subject: [AMRadio] Sonar FS-23 to 10 Meter AM


Hello-
I thought I would ask if anyone has ever converted a Sonar FS-23 over 
to 10
meter AM? I picked one up at a swapmeet and have been studying 
conversion
possibilities. Here is my plan to convert it, and I submit it for 
opinions,
critical review, etc:
1. Wire in permanently the 16.4 Mhz crystal in the 16 MC crystal osc
circuit.
2. Remove crystals from 4 MC osc circuit.
3. Build a VFO tuned circuit to substitute for crystals in 4 MC osc
circuit. The VFO will tune 6.400 to 6.800 Mhz
4. The new injection freq out of first synth mixer is now 22.800 to
23.200 Mhz. Retune T-5 to peak at this freq range.
5. Repeak receiver front end for 28.800 to 29.200 freq range.
6. Repeak transmitter circuits for same.
I figured I would use the existing circuitry and just change the 
mixing
frequencies. I should be able to build a fairly stable VFO for 6.4-6.8 
Mhz
range. This way I am not confined to crystal frequencies. Of course, I 
would
leave the receiver 5.545 MC crystal osc and transmitter 6.000 MC 
crysta osc.
intact and as they are.
Thanks all, Byron WA5THJ
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