[TenTec] Ameritron SPS-75?

[WA3FIY at radioadv.com]

Hi Clark,

I have VERY LIMITED experience with the SPS-75.  I just put it in 
service with my Herc II New Years day.  So far no issue with switching 
noise BUT I have not tried it on all bands and in various parts of the 
bands.  I have been on 80/75, both ends of the band and 40 CW end 
with no problems.  the local power company is supposed to be 
working on some line noise problems for me and after that is 
complete, it will be interesting to see how quiet the supply is.  Spo far 
so good.  I did ask about returning the unit if it made unacceptable 
noise and was told I could do so.

The 75 amp limit is right on the edge.  I can get full power on most 
bands (into a dummy load meaning ideal match) but on a couple 
bands I only get around 500 watts or so.  Don't recall which bands at 
the moment.  I don't think this will be an issue but if it becomes one, I 
will just parallel my 10 amp Astron through a low voltage drop power 
diode.  that should work OK as it seems the SPS-75 reduces voltage 
gradually at it's current limit rather than folding back.

Probably not much help.

73,

-Lee-



On 4 Jan 2007 at 6:37, Clark Savage Turner wrote:

> Anyone have experience with the Ameritron SPS-75 switching supply?  I 
> like to think it could be a fair supply for my Herc II.  Not concerned 
> with running max power, 75 amps should run it fine, I am more concerned 
> with the RF noise it might generate.
> 
> Clark
> WA3JPG
> 
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