[Hallicrafters] Unexpected Testing Events and Cool Stuff

[Patrick A. Thompson Sr.]

Back in the 60's when there was a lot of AM on 6 meters but not a lot of 
SSB I tapped the 10 Mhz (or there-a-bouts) IF on my SW-250 SSB 
transceiver and used it to feed an AM shortwave receiver always tuned to 
the IF frequency. So I'd turn up the volume on the SW-250 to hear SSB 
and listen to the "outboard" receiver to hear the AM stations. I used a 
set of aux contacts on the Swan to kill the receive audio on transmit. 
The Swan AM position was too narrow for good listening.

It actually worked very well.

So, you could use the 756pro as a "front end" for the S-38E!

Pat
wa4tuk



Bill Gerhold wrote:
> This is cool.  While aligning one of my S-38E's, I used my 756pro to make
> sure my old URM-25D generator was right on frequency.  So, here I am
> punching in the 456khz frequency on the 756pro and then dial the URM-25D for
> that frequency looking for a large blip on the 756pro TFT screen.  This is
> how I do all my alignments, using the URM-25D and the 756pro combination for
> right on the money accuracy.
> 
> I found the BFO was not working on this particular unit and decided to go to
> another S-38E and leave this one alone but then decided to see if I could
> find the BFO signal using the 756pro screen.  While the 756 was still tuned
> to 456khz, I took a lead directly from the pro antenna input and using a
> blocking cap, connected it to the 2nd IF can of the S-38E receiver.  Well,
> all of a sudden, I'm listening to the S-38 455khz signal on the pro and it
> was completely tunable.
> 
> So what do I do, I tune in a 75 meter SSB signal which on the S-38E just
> sounds like the classical monkey chatter since the BFO was not working, put
> the pro in SSB mode and listen to the signal, clear as a bell.  While I knew
> somewhere in the back of my mind this would work, it was nice to suddenly
> witness this event and enjoy it and let it go for a while.
> 
> I then realized (after about 1/2 hour of tuning around on the pro using the
> S-38E as a front end, to disconnect the lead and connect the 756pro to a
> dummy load.  I then dialed in a 75 meter frequency on the 756pro, put it in
> AM mode and turned the wattage down to about 5 watts.  Transmitted a carrier
> and was now using the 756pro as an outboard BFO!  It works great that way
> too.
> 
> Oh well, back to reality.  I don't think using a $3k rig as an outboard BFO
> or a SSB detector is the way to go, so I guess I will fix the onboard BFO.
> Just cool events and happenings at the K2WH household.
> 
> K2WH
> 
>  
> 
> 
> 
> 
> 
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