[amsat-bb] Re: Pre-amps with SWR meter

Stan, W1LE stanw1le at verizon.net
Wed Jun 15 17:21:59 PDT 2011

Hello Mike,

Measure DC resistance from the input coaxial center conductor to the 
output coaxial center conductor.
If it is low resistance then it will pass DC to the preamp.
If it is high DC resistance then somewhere inside is capacitive coupling 
and DC will NOT pass top the preamp.

Also measure DC resistance of the coaxial center conductors to ground. 
It should be high DC resistance.
If this DC resistance is low, it will not pass DC power to the preamplifier.

I do not have a schematic of the referenced SWR meter to verify/review.

I suspect it will pass DC.

Stan, W1LE     Cape Cod   FN41sr

On 6/15/2011 6:22 PM, wolthui3 at msu.edu wrote:
> Installing my new UHF/VHF SSB preamps tonight.  I have FT-847 to send 12VDC to them.  I currently have an SWR meter between the 847 and the preamps.  Can I feed power through the SWR meter safely?  The SWR meter is an SX-1000 by Diamond.
> Thanks,
> Mike
> kb8zgl
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