[amsat-bb] Re: Icom AG-35 Preamp Question

Art McBride kc6uqh at cox.net
Sat Aug 11 21:30:09 PDT 2012

I suggest you use a VOM or DMM to measure the current drawn on 12 volts
going to the power injector. If everything is connected correctly It will
draw 30-200 mA. Confirm that you have continuity in your coax. Some
lightning arrestors have a DC block built in. It is best to test it with a
short run of coax between the preamp and the power injector at the radio
while listening to a local repeater to see if the signal increases when you
apply power to it. If it operates then you can proceed to determine if there
are problems with the coax to the antenna, not carrying the 12 VDC. 

-----Original Message-----
From: amsat-bb-bounces at amsat.org [mailto:amsat-bb-bounces at amsat.org] On
Behalf Of Lawn, Richard
Sent: Saturday, August 11, 2012 3:30 PM
To: amsat-bb at amsat.org
Subject: [amsat-bb] Icom AG-35 Preamp Question

I bought an Icom AG-35 preamp about a year ago. The fellow ham advertised it
as virtually brand new and it was/is. I planned to use it this summer with a
TS-2000 which doesn't supply 12v voltage to the coax to power a preamp as
other xcvrs do. I used a Mirage KP2 unit to inject power to the coax to
drive mast mounted the preamp. When I turn the power on there seems to be
little or no noticeable difference in background noise and worse than that I
cannot here any signals on FO-29 downlink, and I know the bird has been
active. Any suggestions? Is the preamp fried? I can't even get the weather
proof case off to trouble shoot, not that I'd know what to look for. Any
suggestions on repair?


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