[amsat-bb] Re:L band antenna configuration

["Stacey E. Mills" <w4sm@xxxxxxxxxxxxx>]

>This was the planned configuration.  Is this is the actual configuration?
>Both L band hi gain and low gain
>are connected together?

I'm not sure exactly where you're quoting from. Echo? AO-40?  I would doubt 
that the antennas are directly connected together, but rather have 
intervening pre-amps (see below).  This is a good option when there's no 
transmit function, as on L-band.  AO-40 is wired this way:

     OMNI --->|Pre-amp#1|---\
                            C|---->L-band receiver(s)
   HiGain --->|Pre-amp#2|---/

  C= splitter (combiner)

..whichever pre-amp is powered, that's the signal you get. Powering off the 
other pre-amp effectively isolates that antenna.  No moving parts to break.



-- 
  ________________________________________________________________________
  Stacey E. Mills, W4SM    WWW:  http://www.keplerian.com
    Charlottesville, VA     PGP key: http://www.keplerian.com/key
  ________________________________________________________________________  

----
Sent via amsat-bb@amsat.org. Opinions expressed are those of the author.
Not an AMSAT member? Join now to support the amateur satellite program!
To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org