[amsat-bb] Re: Another newbie question

[Andrew Rich]

Mark,

I saw an increase in signal strength on mine from S2 to S9

Now the signal to noise did not change that much, ever so slightly.


  ----- Original Message ----- 
  From: Mark Lunday, WD4ELG 
  To: APBIDDLE at mailaps.org ; amsat-bb at amsat.org 
  Sent: Sunday, December 21, 2008 9:55 AM
  Subject: [amsat-bb] Re: Another newbie question


  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
  wd4elg at arrl.net
  http://wd4elg.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

  Mark,

  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.

  Alan
  WA4SCA



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