[sarex] Re: further late reply regarding ISS simplex

12 Aug 2006

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From: McGrane [mailto:tmcgrane@suffolk.lib.ny.us] 
Hi bob- You must live in a bad area. My fellow amateurs 
always quieted down when they heard an astronaut calling 
someone.
And how can you hear the astronaut on 145.800 if you or anyone
else in your area is transmitting on 145.800?  Simplex when one
end can hear millions of miles of coverage and hundreds of users
and the other end can only hear himself just simply does not
work.
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Seems like you and NASA are pretty set in your ways.
No, ham radio and anyone who stops to think about it will
realize that there is absolutely no advantage to simplex n this
unbalanced situation.  HAM radio learned that decades ago just
working DX.
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Dont you think its time to let some others have their way 
with the space program?
I remeber an joke I heard years ago; NASA spent a million 
dollars to develop a pen that would write in zero 
gravity...... the russians used pencils.
I see no open-mindedness here. pat
I hope what you see is common sense by those who undrstand the
value of operating split in an unblanaced situation.
Bob
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On Fri, 11 Aug 2006, Robert Bruninga wrote:
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Hello again- the astronauts will hear everyone calling
whether its
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split or simplex operation so why not make it
simplex!
Because many of us live near inconsiderate operators that
step all
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Over the downlink by transmitting on the uplink.  Simplex
is just not
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a good idea.
The downlink should be separate from the uplink so that
everyone can
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hear the downlink without interfererence from uplink
stations.
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Bob
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-----Original Message-----
From: sarex-bounces@AMSAT.Org
[mailto:sarex-bounces@AMSAT.Org] On Behalf Of McGrane
Sent: Friday, August 11, 2006 7:43 PM
To: Kenneth G. (JSC-OC)[BAR] Ransom; bruninga@usna.edu
Cc: Manned space BBS
Subject: [sarex] Re: further late reply regarding ISS
simplex
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Hello again- the astronauts will hear everyone calling
whether its
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split or simplex operation so why not make it
simplex!
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pat
On Fri, 11 Aug 2006, Ransom, Kenneth G. (JSC-OC)[BAR]
wrote:
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It sounds like your issue is not that split frequencies
are
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bad but
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that multiple uplinks makes it difficult for the crew to
listen to one
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uplink. ITU region regulations for ground station
operations are the
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culprit. Space has no borders but Earth does so have of
the
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problem is
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getting everyone to agree on a single uplink. Not
everyone
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in the
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world has the same frequency allocations nor do they use
the available
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spectrum in their region the same way.
The issue is not the 20-30 miles but the number of
callers
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in the 2000
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km wide footprint. The station has to listen to all of
them. Since you
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can't hear all of them, it becomes difficult to know
when
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someone is
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talking or not without guidance from the station
operator.
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In the MIR days, the crew did not have the luxury of
near
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full time
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satellite communication that provides voice, email
communication and
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an IP phone that lets them make phone calls. If the MIR
crew wanted to
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talk to someone, they needed to use the ham radio or the
Russian VHF
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space to ground system. The ISS crew has plenty of
options
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to choose
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from when they want to communicate and it depends on the
personality
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of the crew as to which ones get utilized.
Kenneth - N5VHO
-----Original Message-----
From: sarex-bounces@AMSAT.Org
[mailto:sarex-bounces@AMSAT.Org] On
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Behalf Of McGrane
Sent: Thursday, August 10, 2006 6:43 PM
To: Manned space BBS
Subject: [sarex] further late reply regarding ISS
simplex
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Greetings from patrick N2OEQ
Despite support of the present frequency scheme for the
ISS
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I still
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wish to disagree with the policy of split operation with
different
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phone uplinks.
Back when the MIR was up, the russians operated simplex
and
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left the
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radio on to listen for callers.
On several occasions, I called the MIR according to my
tracking
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program and was rewarded several times with a response.
With two different uplink frequencies, the astronauts
are
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less
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inclined to leave the radio on to listen for callers.
When there were several callers here on simplex
responding
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to a CQ
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call from the MIR, we acted civilized and took turns and
everyone made
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contacts so I dont buy the absolute need for split
operation.
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Besides, how many callers could there be within 20 or 30
miles up to
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the horizon.
We've had years of robot like amateur radio on the ISS.
How
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about
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loosening the ties!
Thanks for the soapbox..... pat

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