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Re: further late reply regarding ISS simplex




Sorry kenneth but you totally missed the original point----- theres been
very little phone activity from the ISS for many years and split seperate
frequencies are an unneccesary incumberance to operation.

What good is split operation if the astronauts dont use it????

With simplex, maybe theyll leave the radio on for callers.
That states my point simply.

pat


On Fri, 11 Aug 2006, Kenneth, N5VHO wrote:

> Split operations allows everyone can hear the
> astronauts talking back all the time.
> 
> Kenneth - N5VHO
> 
> --- McGrane <tmcgrane@suffolk.lib.ny.us> wrote:
> 
> > 
> > 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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> > of AMSAT-NA.
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> > > 
> > 
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> 
> 
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