[sarex] Re: further late reply regarding ISS simplex

12 Aug 2006

      I listen to the uplink (split) frequency as well as
the downlink frequency so I can avoid QRM to other
local operators. I can identify any inconsiderate
operators too.
Kenneth - N5VHO
--- Stan Vandiver w4sv@arrl.net wrote:
...
The "transmit-at-will" method of split-frequency
operation is also 
inconsiderate, since no attempt at all is made to
take turns (with 
those near you) in a gentlemanly manner.  For that
we are "rewarded" 
with a clear downlink... most of the time.  I still
find 
unknowledgable people transmitting on the downlink
from time to time, 
and I try to educate them to proper splits and
operation so they can 
make a QSO too.
If you have 10 callers in the Chicago-land area,
courteously taking 
turns calling the ISS on simplex... that may be as
much as a 90% 
reduction in the QRM (only 1 out of 10 calling at a
time) from this 
area.... but probably a little less due to the
randomness of calling 
patterns.  I realize the ISS footprint is much
larger, and you can't 
take turns with the whole country... but if every
urban area were to 
operate similarly, there would indeed be at least
some reduction in 
QRM for the crew.
Inconsiderate people on simplex too?  Sure,
sometimes.  But the key 
is to educate people to proper operation, whether
simplex or split.  
And on simplex, you can IDENTIFY who is
inconsiderate of others.
Best regards,
Stan/W4SV
On 11 Aug 2006 at 20:17, Robert Bruninga wrote:
...
...
Hello again- the astronauts will hear everyone
calling
...
...
whether its split or simplex operation so why
not make it
...
simplex!
Because many of us live near inconsiderate
operators that step
...
all
Over the downlink by transmitting on the uplink.
Simplex is
...
just not a good idea.
The downlink should be separate from the uplink so
that everyone
...
can hear the downlink without interfererence from
uplink
...
stations.
Bob
...
-----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
...
...
Hello again- the astronauts will hear everyone
calling
...
...
whether its split or simplex operation so why
not make it
...
simplex!
...
pat
On Fri, 11 Aug 2006, Ransom, Kenneth G.
(JSC-OC)[BAR] wrote:
...
...
...
It sounds like your issue is not that split
frequencies are
...
bad but
...
...
that multiple uplinks makes it difficult for
the crew to
...
...
listen to one
...
uplink. ITU region regulations for ground
station
...
...
operations are the
...
culprit. Space has no borders but Earth does
so have of the
...
...
problem is
...
getting everyone to agree on a single uplink.
Not everyone
...
in the
...
...
world has the same frequency allocations nor
do they use
...
...
the available
...
spectrum in their region the same way.
The issue is not the 20-30 miles but the
number of callers
...
...
in the 2000
...
km wide footprint. The station has to listen
to all of
...
...
them. Since you
...
can't hear all of them, it becomes difficult
to know when
...
...
someone is
...
talking or not without guidance from the
station operator.
...
...
...
In the MIR days, the crew did not have the
luxury of near
...
full time
...
...
satellite communication that provides voice,
email
...
...
communication and
...
an IP phone that lets them make phone calls.
If the MIR
...
...
crew wanted to
...
talk to someone, they needed to use the ham
radio or the
...
...
Russian VHF
...
space to ground system. The ISS crew has
plenty of options
...
...
to choose
...
from when they want to communicate and it
depends on the
...
...
personality
...
of the crew as to which ones get utilized.
Kenneth - N5VHO
-----Original Message-----
From: sarex-bounces@AMSAT.Org
[mailto:sarex-bounces@AMSAT.Org] On
...
...
Behalf Of McGrane
Sent: Thursday, August 10, 2006 6:43 PM
To: Manned space BBS
Subject: [sarex] further late reply regarding
ISS simplex
...
...
...
Greetings from patrick N2OEQ
Despite support of the present frequency
scheme for the ISS
...
I still
...
...
wish to disagree with the policy of split
operation with
...
different
...
...
phone uplinks.
Back when the MIR was up, the russians
operated simplex and
...
...
left the
...
radio on to listen for callers.
On several occasions, I called the MIR
according to my
...
tracking
...
...
program and was rewarded several times with a
response.
...
...
...
With two different uplink frequencies, the
astronauts are
...
less
...
...
inclined to leave the radio on to listen for
callers.
...
...
...
When there were several callers here on
simplex responding
...
to a CQ
...
...
call from the MIR, we acted civilized and took
turns and
...
...
everyone made
...
contacts so I dont buy the absolute need for
split
...
operation.
...
...
Besides, how many callers could there be
within 20 or 30
...
...
miles up to
...
the horizon.
We've had years of robot like amateur radio on
the ISS. How
...
about
...
...
loosening the ties!
Thanks for the soapbox..... pat

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[sarex] Re: further late reply regarding ISS simplex

Kenneth, N5VHO