[sarex] Re: ARISS Frequencies
ka8vit at ka8vit.com
Sun Aug 13 12:53:59 PDT 2006
Well said, Frank.
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
> 70 cm.
> 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.
> To unsubscribe, visit http://amsat.org/mailman/listinfo/sarex
Bill Chaikin, KA8VIT
USS COD Amateur Radio Club - W8COD
WW2 Submarine USS COD SS-224 (NECO)
ka8vit at ka8vit.com
QRP-L NBR: 2596
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