[Hallicrafters] SR-150 Tuning

[Yardleyite at aol.com]

Greetings all,
                   Interesting point! I had the same situation with my 
SR-2000 "Hurricane" with low receiver output, and realized that I could get power 
out of the 8122's at a few different points. I thought I had a problem in the 
pi-net. 

Upon further inverstigation, I tuned it up per the instructions in the manual 
and I got good power output and strong receiver performance as well. I must 
have had it off resonance.
               Regards,
                           Joe Cro N3IBX


In a message dated 1/5/04 10:43:14 AM Eastern Standard Time, wa0kds at yahoo.com 
writes:


> I am in the process of restoring an SR-400 and have noticed the same 
> thing.  Is this normal for the Hallicrafter transceivers?  If is is has 
> anyone modified the circuit to correct the problem or know what might be 
> causing this. If it was a little off it would not bother me but it  is a 
> long way off.  If this is not normal then what might be the problem?   I 
> have not checked the schematices but knowing a little bit about other 
> Hallicrafter products I expect the SR-150 and SR-400 might have a lot of 
> circuit in common.
> 
> Thanks
> Ron   WA0KDS
> 
> 
> 
> John N. Schwartzberg wrote:
> 
> >
> >> Hey Gang -
> >>
> >> I dusted off my radio bench, then the SR-150, to warm up the shack.  
> >> I noticed the following while tuning it up on both 20 and 40 meters:
> >>
> >> With a resonant antenna load, peaking both the pre-selector tuning 
> >> and the final output tuning for maximum indication on either an 
> >> external watt-meter or the internal meter results in relatively low 
> >> receiver sensitivity.  I can then increase the receiver sensitivity 
> >> with the pre-selector tuning, but at the expense of output.  The 
> >> manual includes the following tuning instructions:
> >>
> >> "Adjust the RF Level control until a small indication is seen on the 
> >> S-meter.  In the transmit mode, the S-meter indicates the relative RF 
> >> voltage.  Adjust the FINAL TUNING control for maximum output and then 
> >> adjust the PRESELECTOR for maximum output indication.  Adjust the RF 
> >> LEVEL control as required to keep the S-meter below S9, while tuning 
> >> the PRESELECTOR."
> >>
> >> Is it "normal" to then be able to peak up the received signal using 
> >> the PRESELECTOR control after this tuning procedure?  I don't recall 
> >> that being the case in the past, but I can't honestly say that I've 
> >> ever checked it.  I follow the prescribed tuning procedure, and go.  
> >> For some reason today, I adjusted the preselector some time after 
> >> tuning thinking the received signals were kind of low, and discovered 
> >> that I could peak them up, but lost about 1/4 to 1/3 of the output 
> >> indication.
> >>
> >> Has anyone else observed this on their SR-150, or does the collective 
> >> brain trust have any thoughts?
> >>
> >> Thanks... and Happy New Year (or is that Hallicrafter's New Year?)
> >>
> >> 73,
> >>
> >> John
> >>
> >> N0GII
> >>
> >> Denver, CO
> 




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