Ron -
Another biggest problem is the sensitivity of phones versus speaker. Phones often require running the AF Gain control near zero for the desired volume. Since the AF preamp and output stages in these receivers run "wide-open" and the volume is set by varying the input signal to these stages, the S/N (hum) ratio is worst at the lowest Gain setting. A series resistor chosen so that the Gain has to be set nearer to 10 - 11 O'clock (EST, you DID remember didn't you?) for suitable volume levels will help considerably.
73, Garey - K4OAH Atlanta
Ron Wagner wrote:
John,
Not sure that changing filter caps will help theheadphone hum. Biggest problem is that new headphones respond to very low freq. I played with my R4B for a long time before I threw in the towel and built an audio filter. Best I can tell, it will be more a function of headphones then your power supply filters.
73,
Ron
won't be happy until I change out those filter caps... :)
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