[amsat-bb] Re: Another newbie question

Mark Lunday, WD4ELG mlunday at nc.rr.com
Sat Dec 20 15:55:56 PST 2008

Thanks, Alan.

I double-checked the coax connections and those are good.

Will double-check power and the pins.  I was wondering if it was just my
hearing that was going.

Mark Lunday
wd4elg at arrl.net

-----Original Message-----
From: amsat-bb-bounces at amsat.org [mailto:amsat-bb-bounces at amsat.org] On
Behalf Of Alan P. Biddle
Sent: Saturday, December 20, 2008 6:47 PM
To: amsat-bb at amsat.org
Subject: [amsat-bb] Re: Another newbie question


You should see a significant jump in signal strength if everything is
working correctly.  On FM you will hear little or no change in background
noise, but in SSB that should be very apparent.  

Two things to check.  The first is to make certain you have the antenna and
feed line going to the right connections.  It sounds obvious, but many have
gotten them backwards.  Best not to transmit through it that way.  ;)

The other is whether the DC voltage is getting to the unit.  Power using the
coax, or separate DC power cable?  

If the first, make certain you are getting 12 volts from your rig.  Check
for 12 volts DC on the rig (or bias T) antenna jack, and that you have a DC
connection to the unit.  Most TX amps have capacitive coupling which will
block the DC.  Verify 12 volts at the antenna feed at the unit.

If the second, check 12 volts to the connector at the unit, and that it is
going to the right pins.  It is possible to make up a little test jig with a
multimeter and check the current draw.

Good luck, and let us know what you find.


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