Jim After looking over your web document. As I see it then the slew distortion is caused by the RF bypass capacitor's inability to discharge fast enough to follow the shape of the audio as it falls. Or, you might say the inability of the load resistor to discharge the capacitor fast enough. If that is the case then it probably effects the higher modulating frequencies more that the lower ones. The Audio bypass is chosen to reduce the RF component of the rectified output to some acceptable value. If that is true then the circuit design could be improved by starting with a higher IF frequency. I would think that the greater ratios of RF to audio frequency would lend its self to a lower time constant there by extending the frequency range of the less distorted audio, Assuming I am on tr5ack here, perhaps one thing that might help is a full wave detector. Two diodes on a center tapped secondary IF XFMR. A smaller bypass capacitor could be used because the RF ripple would be twice the original IF frequency.
Am I on track with any of this detector thinking? Do active detectors or DBL Bal product detectors have similar problems? My guess is that they do, but probably not as noticeable except at lower RF to AF frequency ratios. I know many folks that would say "it isn't that important" and to some degree they are right but it doesn't stop me from trying to understand and design something that is a little better. My fun in this hobby is in the design and modification aspect. Even if no one can tell the difference, it helps me to understand. John, WA5BXO ______________________________________________________________ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
