Looking back through my old ARRL Handbooks, I see that the parasitic
suppressors varied somewhat. Some were the parallel L-R combination used
generally today, others were an actual trap ( which seems, prima facie, at the
very least, peculiar!) while another approach was a trap, loaded by a shunt
resistor, tuned to the parasitic frequency, and coupled by means of a link to
the anode circuit. At first sight, such an approach could see a lower series
impedance on 10 metres while maintaining the impedance at the parasite
frequency, but has anyone here ever tried it? I presume that the idea is, in
all cases, to get an anode parasitic resonance below the grid resonance
You could even make the trap out of nichrome and avoid having to have a
resistor.
73
Peter G3RZP
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