[Collins] wider audio for 51J4?

Bill kirklandb at sympatico.ca
Tue Jun 13 22:33:19 EDT 2006


Audio Transformer has a capacitor across its winding, thereby limiting
 the high end.

Some deltas in the IF sections between the three receivers (from an
earlier post I did)
are listed below.
Bill, ve3jhu


IF Transformers
T103:
	J2: has R175 (100K) across pins 4,3, output is pin 4
	J3: has R159 (220K) across pins 4,3, output is pin 4
	
T104:
	J2: output is pin 6, 
	    coupling cap is 5pf (actually varies for wide/narrow audio
bandwidth)
	J3: output is pin 6, center tap,
	    coupling cap is 2pf
	J4: output is pin 4,
	    coupling cap is 3pf	    

T105
	J2: output is pin 6, center tap
	    coupling cap is 4pf (actually varies for wide/narrow audio
bandwidth)
	J3: output is pin 6, center tap,
	    coupling cap is 2pf
	J4: output is pin 4,
	    coupling cap is 5pf




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