On 9/30/2017 11:46 AM, Kenneth G. Gordon wrote:
Samlex, pure-sine-wave inverter. Get the model(s) which are specified as low or
no RFI. I bought a 300 watt version (don't have the model number handy) and am
very pleased with it.
Hi Ken,
I do NOT share your experience with these inverters. I bought Samlex's
smallest PST-series unit to power the logging computer for our 7QP
county mobile operation. I was able to make it quiet enough, but it
needed a LOT of ferrite cores to do it. Another member of our team
bought one of the bigger PST units, (maybe the 300W version) and we were
not able to make it quiet enough. The thing that makes it hard is that
the antennas are VERY close to the inverter, and any trash on the power
wiring roars into the antenna.
Slide # 213 in the link below
http://k9yc.com/KillingRXNoiseVisalia.pdf
shows what I had to do to make the PST-120-12 quiet enough to use in the
mobile with a hamstick on the back. The top two chokes (the largest
ones) were not needed for 20M/40M in the mobile, but were needed to keep
the noise out of the 160M vertical about 30 ft from my operating desk at
home. The smaller chokes with 4-5 turns are for 40 and 20, the
single-turn clamp-ons are for 2M.
Noise is, of course, a matter of degree. We were operating from very
quiet places in the middle of nowhere, where the local noise is S1. If
you're using the inverter in an urban environment (or in a noisy
vehicle) where the noise level is S9+, you're less likely to hear the
noise from the inverter.
73, Jim K9YC
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