I would be afraid that the switching pulses would show up on the air, or
produce inter mod products every 50 or 100 KHz (or whatever the
switching frequency is)
Thanks
73
Jim W7RY
On 2/7/2020 6:05 PM, Jim Brown wrote:
On 2/7/2020 3:54 PM, Jim Garland wrote:
One might mention that the switcher needs to have a floating 7.5V
output, so it doesn't provide a ground reference for the filaments.
Yes. BUT -- given that switchers are notorious for RF noise, I'd be
seriously cautious about selection of one that's quiet. We all know
it's POSSIBLE to build quiet ones -- the ones that Elecraft and Expert
are using with their amps seem to be pretty quiet.
73, Jim K9YC
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