[Amps] Subject: Henry hum on transmitted signal

[gudguyham at aol.com]

Rob, it seems as though is not “if” but “ when” the choke craps out in those Henry amps.  I’ve seen where many chokes shorted to the core and guys mounted the choke on insulated material instead of getting a new one. Lou


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On Tuesday, September 5, 2023, 7:14 AM, Rob Atkinson <ranchorobbo at gmail.com> wrote:

I think the resonant choke design is clever by a half.  It's just too
finicky and failure prone for my liking.  Also, I've seen a choke
Henry used in one of their amps, I forget which one but it was
supposedly rated for 700 ma.  I have  a 700 ma filter choke out of a 1
KW broadcast rig intended to run continuously and it's at least twice
as big and heavy as the dinky thing Henry used.  I've seen I don't
know how many RF power amplifiers designed for volatile loads like SSB
and CW and they did fine with nothing but around 40 mfd capacitance
for a filter.  I would only use a choke input for power supplies
serving transmission modes that put the supply under continuous load,
such as AM and RTTY.  I would rebuild that power supply for whatever
xmission mode is intended and ditch that resonant choke scheme.

73

Rob
K5UJ
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