No subject

[John T. M. Lyles]

Hi Jon and all,

I have had acceptable results with Nichrome wire as the resistive 
part of parasitic suppressors in FM broadcast transmitters using the 
4CX3500A up to about 5500 watts CW. Probably hundreds of these units 
are around the world with this circuit in them. Also used the wire in 
the prototype of my 100 kW x 2 amplifier at 2800 KHz which I built 
two years ago. However, in that unit, I finalized the prototype 
around small Carborundum type resistors because they were easy to 
mount, and well, they worked too. I also find a bit of ferrite is 
helpful in some magic absorbers. I do not built these things from 
paper models and equivalent circuits, but with a network analyzer 
sweeping a cold amplifier circuit. Right now I have no suppressors in 
the big amp.


OK, my 2 cents worth. If I get a chance to digitize some plots from 
the ANA, I could show some examples of before and after sweeps of the 
amplifier S21 response.

John
K5PRO

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