Hi,
One solution is to use batteries. Charge the batteries while you are
*NOT* using the radios and noisy power supplies won't interfere (unplug
those rascals). I am using a combination of batteries and old fashioned
'iron' chargers. There is no power line crud conducted into my radios
and no switcher RFI. I began the "all battery" practice when I started
NDB hunting and 630 meter listening. Lower powered transmitters can last
a while on battery operation too.
For high output transmitters - well you are on your own. Batteries do
not seem practical for 1500 watt amplifiers plus the exciter. For
receive use they are helpful.
73,
Bill KU8H
On 11/26/19 12:50 PM, Michael Walker wrote:
I have now tossed all my Amateur switching supplies (almost). The older
they got, the noisier they got.
The last one to go was the Alinco DM-330V. I really liked this as a bench
supply, but its time has come.
It was bad on 160M and even bad on 6M. I replaced it with an old iron
Astron RS70 that I had lying around and that cleared that up. Birdies all
gone.
However, I did get a 30A SolidState Powerwerx from the office to test and I
have to admit is is pretty quiet on HF.
If you really want to be sure, limit you switching supplies and/or have a
good listen to them.
Mike va3mw
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