RFI from SMPS is far less at VHF as compared to HF, and VHF antennas for
weak signal work are generally far separated from the shack and highly
directional. The reason is pretty simple -- the noise source is the
harmonics of square waves in the range of 10-20 kHz, which by the time
you hit VHF are relatively weak as compared to HF. Bottom line -- I
wouldn't take the acceptability of a given SMPS unit at VHF as
indicating acceptability at HF and MF. It MIGHT be OK, but then again,
it might not. :)
73, Jim K9YC
On Fri,5/12/2017 5:52 AM, KR7O wrote:
These surplus power supplies are becoming popular at least with the VHF guys
to drive the current SSPA 1KW pallet amps out there. They are reportedly
reasonably RF quiet,
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