[sarex] Re: ARISS Frequencies
hutch at electric-web.org
Sun Aug 13 16:13:22 PDT 2006
Regarding the ISS split Frq's, I am in favour for the split, I monitor
the ARISS Frq. 24 / 7days a week. Although I may not be in the shack at
the time I'm generally within hearing distance and if I hear activity
I come in to monitor it. I'm sure that if the ISS used simplex with
others calling every orbit I wouldn't bother.
That's my bit regarding ISS frqs. and I would think I'm not the only one
that follows this practice
Regards Tony. VK5ZAI
P.O.Box 470 Kingston SE
South Australia 5275
Australian ARISS Co-ordinator
and Satellite ground Station.
Web Site :-
Frank H. Bauer wrote:
>I have seen the back and forth chatter on frequencies. Let me say that the
>ENTIRE ARISS international team have discussed this subject and debated it
>for over 10 years now. And the Mir and Shuttle teams have worked on this
>for about 13 years before the ARISS team. Collectively, we have spent many
>hours in international meetings discussing this issue. And the ARISS team
>has developed and implemented an INTERNATIONAL human spaceflight plan for 2
>meters. This plan represents the best compromise that can be developed,
>given the substantial differences that exist in band planning from one area
>to the next.
>Several things to think about:
>1) We have many astronauts/cosmonauts using the equipment.
>2) Those on-board that use the ARISS equipment do not like to hear the
>uplink chatter of Packet, APRS or SSTV.
>3) 1 & 2 above result in the need to separate the uplinks of these
>non-voice modes from voice.
>4) One of the big joys (and learning experiences) of ARISS is to hear the
>downlink of the on-board crew member. One cannot do this well when some
>local ham is transmitting on the same freq. This is especially true in big
>cities where there are a lot of hams. I personally experienced the
>frustration of hams transmitting on the downlink many times while Mir used
>simplex. And the reason that DXers use split mode is to prevent this
>issue, so that all can hear the DX station.
>5) ARISS is the ultimate DX, so split operation emulates the DX operations
>done on the ground.
>6) Remember---unless the repeater is in use, you cannot hear who is
>transmitting from the ground and when they will stop. So it is generally
>hard to know when to start. For simplex operations, this results in
>frequency collisions with people on the ground uplinking at the same time
>that the on-board crew is downlinking.
>7) I am really surprised at all the chatter about wanting to get crew
>members to talk more on the radio. We just had Bill McArthur on
>board. And Pavel is working hard to get SSTV on the air. Kenneth Ransom
>and Sergey Samburov have done an outstanding job in getting the on-board
>crews motivated to use the ham radio systems. I think this community has
>been around long enough to realize that it is the crew member's prerogative
>to pick up the mic. Simplex or split.
>8) Constant complaints or slams at the space agencies and our crew members
>will ultimately limit or eliminate our future operations on ISS and other,
>future vehicles. Remember, there are many that subscribe to these systems
>that are members of the various space agencies. And we have also have
>several crew members that subscribe to these systems.
>9) Because of the significant frequency contention on 2 meters, we have
>developed a dedicated, international human spaceflight frequency segment on
>10) If we continue to foster a great relationship with the international
>space agencies, Human spaceflight opportunities beyond low Earth orbit
>could potentially be in our future. Many of us in the ARISS program are
>working this very aggressively. These opportunities will dictate the use
>of much higher bands with smaller antennas and less doppler. We need to
>prepare for these opportunities by using some of our higher bands on
>ISS. Something to think about for the future.
>Personally, I really appreciate the feedback from the amateur
>community. This is how we learn and grow. But we need to do this in a
>very constructive way. And while we reminisce about Shuttle or Mir, we
>need to realize that THESE are the good old days. Let's use them to the
>best of our abilities.
>WRT the simplex issue and additional 2 meter frequencies, it is my opinion
>that we have all beat it to death. We have squeezed just about all we can
>get from 2 meters. And for those in the US---please remember that our 2
>meter band is 2 times larger than that in many other countries.
>Thanks for all the interest in ARISS. And don't forget that our next
>international meeting will be in the US this year in conjunction with the
>AMSAT-NA meeting in San Francisco. This is your opportunity to interact
>and participate more fully in the ARISS program. I hope to see you there!
>73, Frank Bauer
>ARISS International Chairman
>AMSAT V.P. for Human Spaceflight Programs
>Via the sarex mailing list at AMSAT.ORG courtesy of AMSAT-NA.
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