[Boatanchors] SP-600 alignment problem

[DJED1 at aol.com]

One thing I have struggled with is how to set/check the phasing control on  
my SP-600.  The two peaks in the crystal filter may mean that the phasing  
is not set for a symmetrical passband.  I've tried unsuccessfully up until  
now to do a swept measurement- I think I need a sweep generator to get a 
clean  measurement.  So I've fiddled with the setting of the phasing control, 
then  slowly tuned around to see if the passband is symmetrical.  When I was  
satisfied, I peaked the generator on the crystal, then did the rest of the  
alignment.  I also noted that there was a dot of red paint on the phasing  
shaft, which might imply the zero setting.  You can check that, but I found  
two marks and I had to fiddle around too select the right one.
I did all my alignments in manual mode, with a 4 Mc RF input, so  I don't 
have to clip the generator into the receiver.  Obviously, you want  the radio 
all warmed up.  I then bring the generator output up just enough  to get a 
good reading at the audio terminals.  However, I haven't looked  closely to 
see if my radio performs any better.  Let me know if you  want a check.
Ed  W2EMN
 
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