Hi, Nick,
That's a good point. If you use a doublet antenna and a low impedance
transmission line, as shown in the Hallicrafters S-40B manual, that 1000
ohm resistor would possibly drop the signal level quite a bit.
It depends on the impedance of the tuned circuit C4/C7A with half of L3
as transformed to the other half of L3 for presentation to the antenna
circuit in series with R65.
R65 might help a lot with BC overload without affecting the received
signal much because atmospheric (and modern electronic) noise would be
the limiting factor in most cases.
But you are right in that bypassing R65 might increase signal levels to
advantage in some cases.
73,
Maynard
W6PAP
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On 2/11/25 09:17, Nick, W1NJC via groups.io wrote:
So the same would be true for L6...
Also, I wonder if under some circumstances (~1/2w antenna) shorting out
that 1k resistor would improve Band 1 performance.? Seems like it would
be a voltage divider the way it's configured in the schematic.? Unless
maybe it was intentional attenuation to stop broadcast band overload in
urban areas?
