With the coming of the next group of HEO satellites I am checking if there is any interest in a 10' Weingard mesh dish. It has been taken out of service by a local manufacturing company here in central Ohio and has been taken apart and will be created, ready to be shipped. If you have an interest, please contact me at [email protected]
Regards,
Gunther Meisse
W8GSM
Gunther (Gog) Meisse
WVNO / WRGM / WMFD
2900 Park Avenue West
Mansfield, OH 44906
Ph: 419-529-5900
Cell: 419-544-8622
Fax: 419-529-2319
www.NorthcentralOhio.com
Wow, Gunther! That is a lot of antenna. How are you going point that monster? Auto-tracking will be required, and when you do that, it had better be right on the money, and update about every minute or so. Well, whatever floats your boat. Enjoy!
Remember, once you can hear the noise floor of the transponder, then additional gain is, well, not needed very much, let's say (HI).
I, on the other hand, plan to use the smallest antenna pair I can get away with. I thought that was the advantage of satellite operating: 140 foot towers with a stack of monobanders not needed? (HI).
73, John - K8OCL
From: "Gunther Meisse" [email protected] To: [email protected] Subject: [amsat-bb] 10' Dish available Date: Fri, 13 Oct 2006 11:02:24 -0400
With the coming of the next group of HEO satellites I am checking if there is any interest in a 10' Weingard mesh dish. It has been taken out of service by a local manufacturing company here in central Ohio and has been taken apart and will be created, ready to be shipped. If you have an interest, please contact me at [email protected]
Regards,
Gunther Meisse
W8GSM
Gunther (Gog) Meisse
WVNO / WRGM / WMFD
2900 Park Avenue West
Mansfield, OH 44906
Ph: 419-529-5900
Cell: 419-544-8622
Fax: 419-529-2319
www.NorthcentralOhio.com
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
John,
Remember, one of the advantages of the SDX is a much lower noise floor. So with this, you still might be able to hear and demonstrate it. ;) I always did enjoy doing that with AO-13.
Alan WA4SCA
Before someone thinks I was crowing, I reread what I just posted and I wanted to point out that I was being facetious about hearing the IF.. didn't come across the way I meant. I do remember there were a few odd noises from the satellite you could hear with the big dish though, mixing products or the suppressed spurs from the transmitter.. I don't remember which, but it baffled me at the time.
73, Jason N1XBP
Wow, Gunther! That is a lot of antenna. How are you going point that monster? Remember, once you can hear the noise floor of the
transponder, then
additional gain is, well, not needed very much, let's say
(HI).
With the coming of the next group of HEO satellites I am checking if there is any interest in a 10' Weingard mesh
dish.
Having collected old 10' dishes myself (with no practical applications), I can add these comments too: 1) The dish is "overkill" for the simple reason, that AMSAT would not be designing any transpondrs that would "require" that kind of gain, otherwise very few people could use the satellite. SO AMSAT designs for smaller more practical size dishes, lets say up to 1 meter or maybe 4 feet or so in size.
2) But this means that the 10' dish can uaually be broken up into 4 quadrants and 4 reasonable sized amateur radio dishs can result. Being 1/4th the size and 1/4th the mass, it is easier to build a mount and tracking system. And the quadrant will work just as well as any other approximate 1 meter antenna with the proper feed.
See my web page (near the bottom) on the subject: http://www.ew.usna.edu/~bruninga/amsat-ideas.html
Bob, WB4APR
Bob, Your creativity *never* ceases to amaze me! 73, Jim KQ6EA
--- Robert Bruninga [email protected] wrote:
Wow, Gunther! That is a lot of antenna. How are
you going
point that monster? Remember, once you can hear the noise floor of the
transponder, then
additional gain is, well, not needed very much,
let's say (HI).
With the coming of the next group of HEO
satellites I am
checking if there is any interest in a 10'
Weingard mesh dish.
Having collected old 10' dishes myself (with no practical applications), I can add these comments too:
- The dish is "overkill" for the simple reason,
that AMSAT would not be designing any transpondrs that would "require" that kind of gain, otherwise very few people could use the satellite. SO AMSAT designs for smaller more practical size dishes, lets say up to 1 meter or maybe 4 feet or so in size.
- But this means that the 10' dish can uaually be
broken up into 4 quadrants and 4 reasonable sized amateur radio dishs can result. Being 1/4th the size and 1/4th the mass, it is easier to build a mount and tracking system. And the quadrant will work just as well as any other approximate 1 meter antenna with the proper feed.
See my web page (near the bottom) on the subject: http://www.ew.usna.edu/~bruninga/amsat-ideas.html
Bob, WB4APR
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
Jim, Thanks. I stumbled on that idea when the boss ordered me to the roof to clean up the old dishes (lost two due to huirricane damage) and I noticed that one had only a single quadrant that was intact... Bingo... Couldn't throw it away! Had to think of a use for it...
Bob
-----Original Message----- From: Jim Jerzycke [mailto:[email protected]] Sent: Monday, October 16, 2006 10:50 AM To: [email protected]; [email protected] Subject: Re: [amsat-bb] Re: 10' Dish available
Bob, Your creativity *never* ceases to amaze me! 73, Jim KQ6EA
--- Robert Bruninga [email protected] wrote:
Wow, Gunther! That is a lot of antenna. How are
you going
point that monster? Remember, once you can hear the noise floor of the
transponder, then
additional gain is, well, not needed very much,
let's say (HI).
With the coming of the next group of HEO
satellites I am
checking if there is any interest in a 10'
Weingard mesh dish.
Having collected old 10' dishes myself (with no practical applications), I can add these comments too:
- The dish is "overkill" for the simple reason,
that AMSAT would not be designing any transpondrs that would "require" that kind of gain, otherwise very few people could use the satellite. SO AMSAT designs for smaller more practical size dishes, lets say up to 1 meter or maybe 4 feet or so in size.
- But this means that the 10' dish can uaually be
broken up into 4 quadrants and 4 reasonable sized amateur radio dishs can result. Being 1/4th the size and 1/4th the mass, it is easier to build a mount and tracking system. And the quadrant will work just as well as any other approximate 1 meter antenna with the proper feed.
See my web page (near the bottom) on the subject: http://www.ew.usna.edu/~bruninga/amsat-ideas.html
Bob, WB4APR
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
Bob, Jim,
How does one build a feed to properly illuminate a pizza slice-shaped reflector? Or is this a matter of 1/4 of a 10' dish being still so over-kill that you only use the fat end, and under-illuminate that?
Greg KO6TH
----Original Message Follows---- From: "Robert Bruninga" [email protected] Reply-To: [email protected] To: "'Jim Jerzycke'" [email protected], [email protected] Subject: [amsat-bb] Re: 10' Dish available Date: Mon, 16 Oct 2006 11:50:32 -0400
Jim, Thanks. I stumbled on that idea when the boss ordered me to the roof to clean up the old dishes (lost two due to huirricane damage) and I noticed that one had only a single quadrant that was intact... Bingo... Couldn't throw it away! Had to think of a use for it...
Bob
-----Original Message----- From: Jim Jerzycke [mailto:[email protected]] Sent: Monday, October 16, 2006 10:50 AM To: [email protected]; [email protected] Subject: Re: [amsat-bb] Re: 10' Dish available
Bob, Your creativity *never* ceases to amaze me! 73, Jim KQ6EA
--- Robert Bruninga [email protected] wrote:
Wow, Gunther! That is a lot of antenna. How are
you going
point that monster? Remember, once you can hear the noise floor of the
transponder, then
additional gain is, well, not needed very much,
let's say (HI).
With the coming of the next group of HEO
satellites I am
checking if there is any interest in a 10'
Weingard mesh dish.
Having collected old 10' dishes myself (with no practical applications), I can add these comments too:
- The dish is "overkill" for the simple reason,
that AMSAT would not be designing any transpondrs that would "require" that kind of gain, otherwise very few people could use the satellite. SO AMSAT designs for smaller more practical size dishes, lets say up to 1 meter or maybe 4 feet or so in size.
- But this means that the 10' dish can uaually be
broken up into 4 quadrants and 4 reasonable sized amateur radio dishs can result. Being 1/4th the size and 1/4th the mass, it is easier to build a mount and tracking system. And the quadrant will work just as well as any other approximate 1 meter antenna with the proper feed.
See my web page (near the bottom) on the subject: http://www.ew.usna.edu/~bruninga/amsat-ideas.html
Bob, WB4APR
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
_______________________________________________ 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
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How does one build a feed to properly illuminate a pizza
slice-shaped
reflector? Or is this a matter of 1/4 of a 10' dish being
still so
over-kill that you only use the fat end, and under-illuminate
that?
Well, presumably one will be using this on S-Band either for 802.11 or other 2400 MHz purpose so one has to build his own feed anyway. Probably a dipole over a splashplate. That is typically a good feed for a typical .4 F/D dish? If that is so, then when it is used to illuminate just 1/4th of the dish area, then there is spillover and a few dB are lost. Maybe a good feed for the 1/4 quadrant dish might be a dipole over a splashplate with a director?
Someone who is good on feeds might suggest the right answer here... But in any case, one is not trying to illuminate the tastey end tip of the pizza slice, but generally the center of the crusty end...
De WB4APR, Bob
participants (7)
-
Alan P. Biddle -
Greg D. -
Gunther Meisse -
Jason White -
Jim Jerzycke -
John Champa -
Robert Bruninga