How does one eliminate chirp in a master oscillator power amplifier, MOPA design? Lightly couple the crystal to the tube, regulate the voltage, or design a separate oscillator? Thinking back I had issues with the Ameco AC-1 which was my first transmitter with a MOPA design. Besides the Ameco or CONAR transmitter does anyone recall another MOPA transmitter used by Hams? Mike N2MSOn 08/19/2024 7:13 PM EDT Ken Gordon <[email protected]> wrote: Well, IMHO it depends very much on the AMOUNT of chirp. Sure, al little is fine, but a yoop can make it hard to copy at speeds greater than 20 WPM. Personally, I will make great efforts to remove as much chirp as possible...and I want NO clicks. Minimizing chirp isn't really all that difficult for most rigs....even for the Conar. Ken W7EKB On 19 Aug 2024 at 21:21, sbjohnston--- via Milsurplus wrote:Clicks can take up a lot of bandwidth so it is understandable that they would be of concern. Same with hum on the carrier. But chirp or yoop takes up only a little extra bandwidth and I've never felt it was too a big deal for routine contacts. Actually helps discern one signal from another and gives character, right? I'd love to have a time machine to go back and hear how the bands sounded in the decades before I was a ham. I bet they were more interesting than today. The only Official Observer card I ever received was for operating "out of band". I was on 40m CW with my crystal controlled HW-16 and he was hearing me 455 or 910 kHz away from my actual frequency (I don't recall which). Even as a Novice I remember thinking that this seemed more likely a receiver problem on his end than a transmitter issue at my station. I was in QSO with another station at the time the OO report mentioned, so clearly at least some of my energy was inside the band. I set up my station to match my logged conditions of that date and time and listened with my Knight R-100 shortwave receiver (my only other piece of gear in those early days) for a spurious out of band signal - nothing heard. It is not impossible that I had a spurious emission that he heard, but it would be a remarkable coincidence that it was 455 or 910 kHz from the main signal. If he was having a receiver problem, I bet he wrote a lot of cards that day for all those stations he was hearing out of the band. Steve WD8DAS______________________________________________________________ Milsurplus mailing list Home: http://mailman.qth.net/mailman/listinfo/milsurplus Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html