[Date Prev][Date Next][Thread Prev][Thread Next] - [Date Index][Thread Index][Author Index]

Re: SUNSAT reported dead



Interesting idea...  If it worked.  One FM voice channel is certainly not
enough during an LEO pass, especially over the east coast of North America.
Hopefully we'll see more dual transponder experiments on LEO's in the
future...

Frank
wb2bxo@amsat.org

----- Original Message -----
From: Tony Langdon <tlangdon@atctraining.com.au>
To: 'Frank Grossman (WB2BXO)' <flgrossman@earthlink.net>; Tony Langdon
<tlang@freeway.apana.org.au>; <amsat-bb@AMSAT.Org>
Sent: Sunday, February 04, 2001 8:42 PM
Subject: RE: [amsat-bb] SUNSAT reported dead


> The dual frequency was actual two independent Mode J transponders
operating
> simultaneously.  Unfortunately, problems with Mode J in general (lack of
Rx
> sensitivity) were made much worse (10 - 20dB worse) by this configuration,
> so it was never used in general operation.  The idea was to provide an
extra
> channel for more voice QSOs during a pass.
>
> By the time SO-35 went back to Mode B, the idea was forgotten...
>
> Tony Langdon.
> Systems Development and Support.
> ATC Training Australasia.  Level 2 321 Exhibition St Melbourne  3000.
> Phone:  1300 13 1983     WWW:  http://www.atctraining.com.au
>
>
>
> > -----Original Message-----
> > From: Frank Grossman (WB2BXO) [mailto:flgrossman@earthlink.net]
> > Sent: Monday, 5 February 2001 6:19
> > To: Tony Langdon; amsat-bb@AMSAT.Org
> > Subject: Re: [amsat-bb] SUNSAT reported dead
> >
> >
> > What, prey tell, was the "dual frequency" transponder?  I thought all
> > transponders--other than  the parrot--are dual frequency.
> >
> > Speaking of the parrot, I have a QSL for a parrot contact on
> > a US East Coast
> > pass.  I understand there weren't many parrot contacts on
> > those passes.
> >
> > 73,
> > Frank
> > wb2bxo@amsat.org
> >
> > ----- Original Message -----
> > From: Tony Langdon <tlang@freeway.apana.org.au>
> > To: <amsat-bb@AMSAT.Org>
> > Sent: Sunday, February 04, 2001 8:12 AM
> > Subject: Re: [amsat-bb] SUNSAT reported dead
> >
> >
> > >
> > > Hello Bruce!
> > >
> > > 03 Feb 01 16:46, you wrote to All:
> > >
> > >  BP> i guess i now hold one more piece of history. i wasn't
> > thinking of it
> > >  BP> and did not start encoding until a bit late in the
> > pass. but most of
> > >  BP> it is there.
> > >
> > > There is an extensive collection of VK passes and
> > accompanying journal on
> > > http://www.qsl.net/vk3jed/sat.html
> > >
> > > Some of these are also of historiacal significance,
> > including those tram
> > mobile
> > > ones (Oct 1999), and the parrot pass that wasn't supposed
> > to happen, back
> > in
> > > March 2000. :)
> > >
> > > Also some details of experiments with dual frequency
> > transponders that
> > were
> > > conducted only over Australia and occasionally South Africa.
> > >
> > > Tony, VK3JED
> > >
> > > .. road ahead, ask those coming back.---
> > > --
> > > |Fidonet:  Tony Langdon 3:633/284.18
> > > |Internet: tlang@freeway.apana.org.au
> > > |
> > > | Standard disclaimer: The views of this user are strictly his own.
> > >
> > >
> > > ----
> > > Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
> > > To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org
> > >
> >
> > ----
> > Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
> > To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org
> >
> ----
> Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
> To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org
>

----
Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org


AMSAT Top AMSAT Home