[TenTec] Power supply for Hercules II

Jim Brown k9yc at audiosystemsgroup.com
Fri May 12 12:31:11 EDT 2017

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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