I would be very suspicious of the growl caused by ferrites on the dc line, the
only reason for that would be ripple, aka noise, on the dc output. May be
worth putting a scope on that or at least adding some serious filter caps to
see if it helps. Also double check anything that comes off the dc lines, if
there are led bulbs, computers or phone chargers or supplies, a tv, etc it
could be a switching supply in them that goes off when you power the dc
converter off.
David Robbins K1TTT
e-mail: mailto:k1ttt@arrl.net
web: http://wiki.k1ttt.net
AR-Cluster node: telnet://k1ttt.net:7373
-----Original Message-----
From: RFI <rfi-bounces+k1ttt=arrl.net@contesting.com> On Behalf Of nm8rmedic
via RFI
Sent: Friday, July 22, 2022 14:11
To: rfi@contesting com <rfi@contesting.com>
Subject: [RFI] Travel trailer converter RFI solutions
Has anyone on the forum succeeded in quieting the RFI from the AC to DC
converter in their travel trailer?Or has anyone identified a suitable linear
power supply with battery charging circuitry?Our trailer has a switching power
converter rated at 55 amps. It produces RFI about every 30 khz, mainly in the
40 and 20 meter amateur bands. Powering down the converter kills them, so they
are coming from the switching power supply that forms the basis of the
converter. Neither an Isobar filtering power strip, nor Mix 31 ferrite cores
on the AC power cable had effect. The same cores on the DC line cause some odd
ferromagnetic resonance inside the converter because it audibly growls when
they are in place. Bypass capacitors on the DC line had no effect.I'm
interested in hearing anyone's success story.ScottSent from my Verizon, Samsung
Galaxy smartphone _______________________________________________
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