[AMRadio] Sonar FS-23 to 10 Meter AM

[Byron Tatum]

OK Bill-
    Thank you for the kind reply. I a not sure if I follow you here- the FS-23 
is a plate modulated AM-only rig, using a 12BH7A to modulate a 6BQ5 final. 
I don't believe I am increasing the load on any part of the unit by just 
changing the freq of operation.
            Thanks, Byron WA5THJ
    



________________________________
From: Bill Harris <w7kxb at msn.com>
To: AMRadio <amradio at mailman.qth.net>
Sent: Thu, April 19, 2012 11:36:22 AM
Subject: Re: [AMRadio] Sonar FS-23 to 10 Meter AM


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
> ______________________________________________________________

                        
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