i am not familiar with the 5100B, but I would be VERY surprised if the
screens weren't modulated as well as the plates - it is absolutely necessary
to achieve 100% modulation of tetrode, pentode, or beam-power calss C RF
stages. This is usually done with this class of transmitters (~100W
commercially-manufactured ham AM rigs)with a screen droping resistor from
the modulated plate supply. It can also be done with a dropping resistor
from the unmodulated B+, or an audio choke from a voltage source equal to
the desired screen voltage; in these cases, the screens self-modulate.
GL,
-Larry/NE1S
Tom Elmore writes:
Does, anyone know of a source for audio mods for the B&W 5100B
transmitter. I wonder if anyone has tried to modulate the screens in
addition to the plate of the finals. It appears the screens use a different
power supply than the plates of the finals.
Thank You
Tom Elmore KA1NVZ
Anchorage Alaska
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