On 3/10/2019 11:34 AM, John Simmons wrote:
Once I got my LP100, I began to see the same behavior with my K3. This type of output anomaly is a huge reason to use ALC.
I've had an LP100 in line for several years, always set to read peak power, and the most overshoot I've seen from either of my two K3s is less than 1 dB. The K3s are driving a pair of 87As, and I have NEVER used ALC between rig and amp.
The earliest advice I've seen about this was in the user manual for the Ten Tec Titan 425, designed around 1979, and using a pair of the same 3CX8007 triodes used in the 87A. The manual said that ALC output was provided only for historical reasons, and advised against using it to control output power.
When you look ONLY at output power, you miss the mess that ALC causes. To see it, you must look at (or listen to) the transmitted frequency spectrum. A P3 on a second radio, or an SDR receiver will clearly reveal the splatter and clicks.
73, Jim K9YC ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft 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
