Hi James:
I am in favor of any band that has the desired results. I just used the 2/440 bands as the opener. Remember the higher in frequency the less affordable the system becomes and the fewer Amateur Radio operators and Short Wave listeners will have access to those frequencies. We do not want to design a system that only 2 people can afford.
Goals: Uplink to the Moon with an antenna system that would cost less than $1000 USD. Receive from the Moon with an Antenna system that would cost less than $1000 USD. An Off the Shelf transceiver system that cost less than $2000 USD.
With a properly designed repeater and properly selected Amateur Radio bands, it should be possible to meet these goals. I have seen some project proposals for ISS for example, that when reviewed it was discovered that no one could afford the project (2 megabit fast TV, the link budget, Antenna, Receiver requirement and precision rotor made the project only affordable by a government).
If we are going to seriously think about a Moon repeater, we need to make sure the Earth stations are practical and affordable.
It would also be helpful if we had more Amateur Radio band with ITU approved Satellite segments. Anyone interested in going to the next WARC meeting to petition for downlink access to 1.2 Gig and wider band access on 70cm.
Thanks Miles WF1F MarexMG.org
--- On Thu, 7/2/09, James French [email protected] wrote:
From: James French [email protected] Subject: [amsat-bb] Re: The Moon is our Future To: "AMSAT-BB" [email protected] Date: Thursday, July 2, 2009, 12:30 PM On Thu, 2009-07-02 at 10:52 -0500, [email protected] wrote:
As far as the dreaming goes, wouldn't an L/S
transponder be better than a
V/U or U/V transponder? Granted, the path loss is
greater, but the antenna
gain is easier to produce...
Miles,
Why not use a L/s, U/L. or a U/s transponder for this? Why limit ourselves to V/u for everything? Aren't we supposed to 'experiment' with the higher frequencies we have allocated?
Its in the AMSAT by-laws to support the higher frequencies.
From the AMSAT-NA by-laws Section three, subsection E:
Encouraging the more effective and expanded use of the higher frequency amateur radio frequency bands.
This would mean smaller antennas with MUCH better gain and beamwidth.
I vote in favor of at least a L/s transponder for this.
James W8ISS
Sent via [email protected]. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
At 03:17 AM 7/3/2009, MM wrote:
Hi James:
I am in favor of any band that has the desired results. I just used the 2/440 bands as the opener. Remember the higher in frequency the less affordable the system becomes and the fewer Amateur Radio operators and Short Wave listeners will have access to those frequencies. We do not want to design a system that only 2 people can afford.
V/U are the bands with the _most_ expensive antenna requirements, because of the sheer size of the arrays required on both ends. L/S would be much cheaper, and particularly the S side is nowadays well supported, just have to enlarge those dishes a bit.
In years gone by, I would never have been able to operate a HEO on 2m and 70cm. However, microwave bands were more practical at the time. Even now, I still believe a HEO would work better for me on microwaves, because of the more modest mechanical requirements. I don't have the mechanical skills to hoist large antenna arrays into the sky. A small dish? That's much more likely. :)
73 de VK3JED / VK3IRL http://vkradio.com
participants (2)
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MM -
Tony Langdon