Rick, 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. 73 Art, KC6UQH
-----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Lawn, Richard Sent: Saturday, August 11, 2012 3:30 PM To: [email protected] 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?
TNX 73 Rick W2JAZ
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