Re: [drakelist] R4C agc problem

[Bob Henderson]

Don   I probably should have been more specific but this effect in the fast agc position was not just a transitional effect.  If I injected a steady carrier into the radio from a sig gen and listened with agc set to medium or slow, the carrier sounded a nice clean T9 but if I switched to fast it adopted a very raspy quality.  At that point I used my scope to discover the recovered audio was modulated 50% by a 150 Hz waveform which was sawtooth in character.  I then scoped the AGC 1 & 2 lines and found sure enough the 150 Hz sawtooth waveform was there.  For what ever reason, when set to fast, the agc system was up and oscillating away happily.   Post fix, the fast position is still uncomfortable to listen to for both CW and SSB but it no longer has the 150 Hz overlay.   73   Bob, 5B4AGN, P3F [EMAIL PROTECTED] www.5b4agn.net   ----- Original Message ----- From: [EMAIL PROTECTED] To: [EMAIL PROTECTED] ; [EMAIL PROTECTED] Cc: drakelist@zerobeat.net Sent: Thursday, May 26, 2005 9:22 AM Subject: Re: [drakelist] R4C agc problem Bob: I agree with Mark about the AGC issue you have described.  The audio will have a somewhat distorted sound at times when in the fast AGC position.  Slowing the AGC release time down just a bit will resolve that issue.  I personally never use the Fast AGC position. I have owned many Drake receivers over the years and have found this to be common. I doubt you really have a problem.   73, Don / WA9TGT