If technically feasible, I would shoot for 50 to 100 kHz. We shouldn't be aiming only at our current membership. A "fixed in space" satellite will gain many users that have not been interested in satellites in the past.
And, then there is the emergency communications capability we should consider. In fact, that needs to be our prime cause for doing this in the first place and our argument for raising money from government and other sources.
73,
Bill, W3XO
----- Original Message ----- From: "John B. Stephensen" [email protected] To: "Andrew Glasbrenner" [email protected]; "Bob McGwier" [email protected]; "'Bill Ress'" [email protected]; "'David Goncalves'" [email protected] Cc: "'AMSAT BoD'" [email protected]; [email protected] Sent: Tuesday, July 15, 2008 8:58 PM Subject: [eagle] Re: what is going on?, some technical content at last.
Assuming the average occupancy that I witnessed on AO-13, a 25 kHz wide linear transponder would work for the current membership, but I have no idea whether they would provide enough donations to fund it.
73,
John KD6OZH
----- Original Message ----- From: "Andrew Glasbrenner" [email protected] To: "Bob McGwier" [email protected]; "'John B. Stephensen'" [email protected]; "'Bill Ress'" [email protected]; "'David Goncalves'" [email protected] Cc: [email protected]; "'AMSAT BoD'" [email protected] Sent: Friday, July 11, 2008 11:20 UTC Subject: Re: [eagle] Re: what is going on?, some technical content at last.
Bob wrote:
There is an alternative to think about. I would not wait forever for the larger picture to come together, for the good of AMSAT and amateur radio. A likelihood assessment needs to be made regularly about the "Vision Thing" and the will power to change directions should be found if it needs to be done. We could put together a small, simple package and smaller than desirable antennas and give our users analog transponders on an Intelsat platform. This would require large antennas on the ground and would serve to make our current user base quite happy I am sure. If we do this, it should be the absolute dumbest, most bullet proof, impossible to destroy, dumber than rock, transponder without a single chance of failing in 300 years unless the rocket blows up or it is hit by a meteor. It would be a box with two connectors and a power plug going to the smallest possible CREDIBLE antennas. There has been an argument that this is very undesirable for the long term health of AMSAT, Inc. I made the argument in the open and have suffered regular personal threats as a result since from one very angry disgruntled member. I am sure it was the manner in which I presented the argument that caused the reaction so I am 99% to blame.
But this is clearly outside of the vision statement of AMSAT, but it would be a way forward. If we come in with very low mass, with little footprint and 50-100 w peak power requirements, and we look at the matrix of costs Intelsat gave us, I think we might be able to raise that amount from "amateur radio sources".
This idea has been floating around for some time now, but to see you suggest it is a powerful example of convergent thinking. I do not believe that it is an either/or situation. The ACP is a complex design, and developing and implementing it is going to be a long road, that frankly we may not have enough momentum to carry us down. A simple, SMALL linear transponder as you describe would serve as an intermediate step, allowing us to keep the organization alive, build the membership and hence the donation base, and blaze the trail to launching ACP.
One point of disagreement is that this intermediate step is, to me at least, clearly -inside- the mission statement, even moreso than the ACP. For those that have forgotten, here is the mission statement:
"AMSAT is a non-profit volunteer organization which designs, builds and operates experimental satellites and promotes space education. We work in partnership with government, industry, educational institutions and fellow amateur radio societies. We encourage technical and scientific innovation, and promote the training and development of skilled satellite and ground system designers and operators.
Our Vision is to deploy high earth orbit satellite systems that offer daily coverage by 2009 and continuous coverage by 2012. AMSAT will continue active participation in human space missions and support a stream of LEO satellites developed in cooperation with the educational community and other amateur satellite groups."
The intermediate step would immediately fulfill the continuous coverage part of the vision statement, and I think it has a much better chance of success by 2012, and certainly 2009, than does the ACP.
The decision to make this course correction certainly does have considerable benefits and risks, but I think it is one the BOD -and- the members should carefully consider, and if we go forward with it, the infighting and Monday morning quarterbacking needs to be left behind and a serious "get to the moon" effort be undertaken. We'll need 10 times the people soliciting donations as actually building the thing, but I do believe it's well within reason to be accomplished.
73, Drew KO4MA
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