Re: [amsat-bb] Who is wasting uplink power?

["Lee" <lee-fl@xxxxxxxxxx>]

I don't think you can quite make the jump from LEILA triggering on a pulse
to AGC activity.  You really need to know the transmitted signal
characteristics and how they compare with the AGC time constants.
Information on AO-40's AGC and ALC circuits is something that I haven't
found much information for yet.  Another key piece in the puzzle would be
the filter bandwidth of the U-rx.

You might also want to look at the data.  It does not happen every orbit and
from the orbits I've looked at so far doesn't match up with known PAVE-PAWS
sites on a consistent basis.  Another very interesting thing in the data is
the AGC peaks that happen around perigee when AO-40's antennas are pointed
out to space.

Lee-KU4OS

----- Original Message ----- 
From: "Jon Ogden" <na9d-2@speakeasy.net>
To: "Peter Guelzow" <peter.guelzow@kourou.de>; "Reinhard Richter"
<r.richter@dj1km.de>
Cc: <amsat-bb@AMSAT.Org>
Sent: Thursday, May 01, 2003 20:31 PM
Subject: Re: [amsat-bb] Who is wasting uplink power?


> Peter is absolutely correct.  This is one reason why I find the AGC
numbers
> suspect in general for the U band.  If the radar can trigger Leila, the
> radar will cause the AGC to pump as well.
>
> 73,
>
> Jon
> NA9D
>
> on 5/1/03 3:14 PM, Peter Guelzow at peter.guelzow@kourou.de wrote:
>
> > Hi Reinhard,
> >
> > the answer might be RADAR-QRM on the Uplink, for example PavePaws...
> >
> > 73s Peter DB2OS
> >
> >
> > Reinhard Richter wrote:
> >> Hello all,
> >> I receive and save AO-40 telemetry with AO40Rcv regularly. When
watching
> >> the status screen (F2) today I noticed substantial values on U-RX AGC.
> >> I know that the rx is switched on, but who is transmitting when the
> >> transponder is switched off?
> >>
> >> Some values of today:
> >> block 693  10.1
> >> block 696  13.8
> >> block 710  14.7
> >> position of the sat was lon -5 lat -2 at 11:57 UTC
> >>
> >> block 1214  9.2  )
> >> block 1216  9.2  )
> >> position of the sat was lon -50 lat 0 at 15:54 UTC
>
> -------------------------------------
> Jon Ogden
> NA9D (ex: KE9NA)
>
> Citizen of the People's Democratic Republik of Illinois
>
> Life Member: ARRL, NRA
> Member:  AMSAT, DXCC
>
> http://www.qsl.net/na9d   <- Updated on 1/22/03!!!
>
> "A life lived in fear is a life half lived."
>
>
> ----
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