[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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