[AMRadio] Sonar FS-23 to 10 Meter AM

Thu Apr 19 22:31:18 EDT 2012

Sorry Bryon....I was thinking of the Sonar VFX-680 NBFM exciter.  It was the answer to those who were pledge with TVI in the late 40's.  Running NBFM eliminated the cross hatching seen on the screen caused by AM'ing a transmitter, though the carrier would probably cause some TVI as well.You say you have the FS-23, which was their was their 5 watt; 23 chanel CB radio that came out in 65.

http://www.radiomuseum.org/r/sonar_exciter_vfx_680.html 
http://www.radiomuseum.org/r/sonar_fs_23_fs2.html

Later
de Bill-w7kxb/7. .

> Date: Thu, 19 Apr 2012 15:30:02 -0700
> From: bjtatum1 at att.net
> To: amradio at mailman.qth.net
> Subject: Re: [AMRadio] Sonar FS-23 to 10 Meter AM
> 
> 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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