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@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 _______________________________________________ Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb

Hi Mike, KB8ZGL

Any SWR meter has a directional coupler inside that pass DC so you can can feed DC power throught it safely like into a coax cable.

73" de

i8CVS Domenico

----- Original Message ----- From: wolthui3@msu.edu To: "AMSAT" amsat-bb@amsat.org Sent: Thursday, June 16, 2011 12:22 AM Subject: [amsat-bb] Pre-amps with SWR meter

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 _______________________________________________ Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb