> I have used an Astron RS35M for 30 yrs. and it
> is noise free, I own several other Astrons and
> none of them make any noise when running.
> Gene Hawkins
And Gene, not only is your Astron quiet, but it is also RF quiet, too. No
matter what anybody says, all switching mode power supplies put out RF noise.
Some guys don't know what it sounds like, so they will deny that any noise is
generated by their units. But give me a receiver and I will find the noise
every time. It may be weak, but it's there. And certain antenna configurations
make the problem worse. This is why I have never liked switching mode power
supplies. Sure, they're light. But they are also sources of RFI and I don't
allow them near my shack.
It is difficult enough to deal with the many, many SMPS in electronic devices
all over this neighborhood, most of which are many times worse than the ones
many hams use.
Gene, a big, linear power supply is awesome. Hang on to that unit.
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