For high power systems, I prefer to put an intermediate dummy load with a coaxial patch panel to select load or driving the final stage. This is done as it is time consuming to have to break loose a
Thanks Karl-Arne and Don for sharing insights in tuning up high power communications xmtrs! John K5PRO -- Having worked with really big transmitters; Telefunken 100 kW ISB and Thomson-CSF 500 kW carr
Et all: I second John's sentiments here. This is more like the kind of discussion I envision for a reflector. A question is posed, and those who have the background, share their knowledge, which educ
Thanks, I can also add that the Telefunken transmitters used Wye-Delta switching for reducing plate and screen voltages during tune-up. Still remember the tune-up sequence from a "cold start" by hear
I want to thank everyone for sharing their wonderful experiences with very high power transmitters. My curiosity was piqued especially when I read about the 600 kW British Aspidistra MW transmitter u
The Aspidistra transmitter was built by RCA, but I have never seen any detailed description or block diagram over it. It may however be suspected that it used the "tuning drawer" or "tuning waggon" c
To compliment what Karl-Arne said about MW and HF broadcasting transmitters, VHF high power transmitters have cavity resonators (sometimes called line circuits) that are in the range of 1/4 to a full