Re: [amsat-bb] RS-20..?? Not Ham.??.

["Don Woodward" <dbwoodw@xxxxxxxxxx>]

Scott:

Since RS20 is similar to RS-21 I believe RS-20 does not have FM repeater or
transponder capabilities - it only sends telemetry, which has been received all
over the world.

I have copied one of the control operators on this email in hopes he will
explain further the capabilities of RS-20.

73's

Don Woodward
KD4APP
AMSAT 33535
kd4app@amsat.org
http://kd4app.webhop.org


----- Original Message -----
From: "Amsat2005" <Amsat2005@hotmail.com>
To: "AMSAT-BB" <amsat-bb@AMSAT.Org>
Sent: Tuesday, December 17, 2002 23:11
Subject: [amsat-bb] RS-20..?? Not Ham.??.


Russian news agencies quoted a spokesman for the Russian Space Forces as
saying:
the Mozhayets satellite will be used as a learning tool by students of
Russia's military space academy Mozhaysky, said the spokesman.

  The above statement sounds like Hams from other
parts of the world will not have access to RS-20.


Ve3hsc
144.214 USB
www.hamradio.50megs.com
Scott
----- Original Message -----
From: "Lee" <lee-fl@cfl.rr.com>
To: "i8cvs" <domenico.i8cvs@tin.it>; "AMSAT-BB" <amsat-bb@AMSAT.Org>
Cc: "Kevin Schuchmann" <kschuchm@pacbell.net>
Sent: Tuesday, December 17, 2002 10:11 PM
Subject: Re: [amsat-bb] get a clue...


>
> ----- Original Message -----
> From: "i8cvs" <domenico.i8cvs@tin.it>
> To: "Lee" <lee-fl@cfl.rr.com>; "AMSAT-BB" <amsat-bb@AMSAT.Org>; "Kevin
> Schuchmann" <kschuchm@pacbell.net>
> Sent: Tuesday, December 17, 2002 9:00 AM
> Subject: R: [amsat-bb] get a clue...
>
>
> >
> > The problem is that many radio operators in the passband instead to
> > disregard those stations using very high level downlink through the
L-band
> > congratulates instead with those L-band operators for their strong
signals
> > and they are happy to make QSO hearing strong signals so that the
pile-up
> > over a 6 dB or more signal over the beacon is higly populated and
> > continuously operating particularly when the moon is not in range for
some
> > EME operators.
>
> Exactly my point Dom.  There are many people being lead astry into
thinking
> their receiving arrangement is adequate because they hear these MB+6db
> stations with a usable SNR.  Unfortunately what they don't hear is the
> stations operating properly 10db below the beacon because the local noise
> floor is too high.  Further if they don't understand that they are only
> hearing the L-band stations and try to uplink on U-band they will
inevitably
> run excessive amounts of power trying to hear themselves.
>
> > > 2. The L-band rx AGC does not restrict users of this band to the
> > recommended
> > > MB-10db signal level.  As a result some stations attempt to achieve
the
> > same
> > > excessive levels using the 70cm uplink resulting in decreased U-Rx
> > > sensitivity.
> >
> > Stations using excessive 70 cm uplink power cannot achieve the same
> > excessive level of those using L-band because LEILA put  a notch and
> > the siren to the U-band offending signals for level just 8 dB belove the
> > beacon. If i use the U-band uplink i cannot desense the U-band receiver
> and
> > i cannot desense the L-band receiver at all because of the above LEILA
> > limitations.
>
> Clearly from the AGC data there are uplink signals being sent that have
the
> effect of reducing the receiver sensitivity for everyone else.  From what
I
> have seen LEILA operates at the IF level.  This appears to be after the
U-Rx
> AGC.  As a result even though LEILA notches out the offending station's
> downlink, the uplink will continue to drive the AGC.  It is not hard to
> imagine a station who copies the the MB+6db stations with a 10db SNR but
> can't find his U-band uplink and continues to turn up his transmit power
> without even hearing LEILA' s warning siren.
>
> > Normally my 70 cm and 23 cm TX are ON all the time and some time i
prefere
> > to use the U-band uplink but as soon LEILA get a notch on me i can
switch
> > immediately to the L-band and i can continue to discusse with my friends
> > even with a stronger signal over the LEILA siren using the L-band uplink
!
>
> Perhaps I'm missunderstanding what you are saying here.  Why not set a
good
> example and just reduce power to the proper level rather than switching
> modes and further exceeding the recommended operating condition?
>
> > > Take a look at some AO-40 AGC data downloaded from the archive for
this
> > > month.
> > > http://home.cfl.rr.com/lmclamb/ao40agc1202.html
> > >
> >
> > A test of desensing  was made by G3WDG, DJ1KM, 4X1AS and my self some
> monts
> > ago and this indicates that using U-band the SSB is mostly affected by
> LEILA
> > and that CW or a steady carriers like SSTV are  less affected  by LEILA
> for
> > example.
>
> I believe you are exactly right on this Dom.  The result is the high AGC
> values shown in the telemetry data.  As a result, other stations must run
5
> times as much power to overcome the 7db of AGC which exsists over 50% of
the
> time.
>
> 73,
> Lee-KU4OS
>
>
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