[AMRadio] Sonar FS-23 to 10 Meter AM

[Bill Harris]

Sounds like a fun project Byron....Don't know if the components in the final RF amplifier will take the stress of 100% modulation, but you could unload it down to 1/4th the normal input if you run into any problems. de Bill-w7kxb/7. .
> Date: Thu, 19 Apr 2012 08:57:26 -0700
> From: bjtatum1 at att.net
> To: amradio at mailman.qth.net
> 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
> ______________________________________________________________