I notice up to a +10dB pop on the leading edge of cw elements with my Omni 6+. Please see a recorded waveform at http://n1eu.com/omni6agc.gif and the accompanying 20sec recording is at http://n1eu.co
disconnect plug 52 on the if/af board. I never noticed the problem, but my ear is not that "refined"! HI 73 Clayton N4EV ________________________________ From: Barry N1EU <barry.n1eu@gmail.com> To:
Thanks Clayton, but that is only related to the audio from your sidetone and T/R switching (and I already have plug 52 disconnected anyway). My concern is the AGC circuit itself and the audio pops on
Is it possible that I'm seeing AGC popping because the capacitors are aging? I'm thinking of replacing the 14-year old 3.3uF electrolytic AGC timing capacitor with a new tantalum capacitor of equal o
Barry, Possibly leakage with age. I heard the recording, but it sounds like the AGC attack time is a bit too long. Most conventional AGC circuits sample the I.F. with a small signal diode followed by
Paul, the Omni 6 circuit is exactly as you describe, with a 270 ohm charge capacitor and a 330K discharge capacitor. It uses a 3.3uF electrolytic capacitor in fast mode which is paralleled with a 10u
You should be able to change the 270-ohm resistor to find a more suitable attack time. You don't want attack *too fast.* Then, the AGC starts becoming overly aggressive with every micro-burst of elec