It's all good stuff, and should be mandatory learning for anyone laying
out PC boards these days.
73,
-- Dave, N8SBE
Original Message
Subject: Re: [Elecraft] P3 generates noise on 144MHz
From: Roger Crofts ro...@monitorsensors.com
Date: Tue, February 12, 2013 6:02 pm
, and should be mandatory learning for anyone laying
out PC boards these days.
73,
-- Dave, N8SBE
Original Message
Subject: Re: [Elecraft] P3 generates noise on 144MHz
From: Roger Crofts ro...@monitorsensors.com
Date: Tue, February 12, 2013 6:02 pm
To: elecraft
and/or ferrite cores is very expensive, and often doesn't produce the
desired results. Nothing short of re-laying out the offending PCB will
suffice in the majority of cases.
73,
-- Dave, N8SBE
Original Message
Subject: Re: [Elecraft] P3 generates noise on 144MHz
From
: [Elecraft] P3 generates noise on 144MHz
I fitted a commercial EMI filter (intended for 240V AC operation) inside my
P3. It is a fully sealed unit with solder tags. This unit was connected in
the + and - DC supply line. This filter completely removed any trace of
noise from the power cord to the P3
I fitted a commercial EMI filter (intended for 240V AC operation) inside my P3.
It is a fully sealed unit with solder tags. This unit was connected in the +
and - DC supply line. This filter completely removed any trace of noise from
the power cord to the P3.
I used a short coax with a one inch
Last night I cleaned all mating metal surfaces in the P3 but, alas, this made
no difference. The noise was still at S6.
When I had the I/O printed circuit board out of the case, I noticed that the
earth planes for the power supply section and RS232 section are separated by a
zig zag gap. They
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