Can anyone here run a link budget for me?
I'm in an slight heated debate with some people, About how they have heard about the possible Geo synchronous bird coming up, and they are all wondering why don't "THEY" I like the "THEY" part, anyway why don't they just put it on the moon.
I gave them several reasons why a Geo bird is better,
1- It is there 24/7 where the moon is visible less than 50% of the day
2- the Geo bird doesn't move ( or extremely little) so set the antenna and forget it. Where the moon requires tracking programs and antennas that can move in AZ and EL
3- Useable "Window" The amount of the earths surface that can see either is soo close to the same why bother I bet a geo bird would be at least close to 90% of what the moon see's
4- And finally antennas and power required. The moon being soooo much farther away the amount of power needed each way has to be MUCH more. And thats what I was wondering say you had a nice decent transponder in Geo orbit. what power levels say ERP I guess is needed each way? then drop the same transponder and how much more erp each way will be needed to have the same level of contact quality?
Joe WB9SBD
oops I missed Now drop the same transponder on the moon,, and how much more is needed?
Joe WB9SBD Sig The Original Rolling Ball Clock Idle Tyme Idle-Tyme.com http://www.idle-tyme.com On 11/7/2015 1:57 PM, Joe wrote:
Can anyone here run a link budget for me?
I'm in an slight heated debate with some people, About how they have heard about the possible Geo synchronous bird coming up, and they are all wondering why don't "THEY" I like the "THEY" part, anyway why don't they just put it on the moon.
I gave them several reasons why a Geo bird is better,
1- It is there 24/7 where the moon is visible less than 50% of the day
2- the Geo bird doesn't move ( or extremely little) so set the antenna and forget it. Where the moon requires tracking programs and antennas that can move in AZ and EL
3- Useable "Window" The amount of the earths surface that can see either is soo close to the same why bother I bet a geo bird would be at least close to 90% of what the moon see's
4- And finally antennas and power required. The moon being soooo much farther away the amount of power needed each way has to be MUCH more. And thats what I was wondering say you had a nice decent transponder in Geo orbit. what power levels say ERP I guess is needed each way? then drop the same transponder and how much more erp each way will be needed to have the same level of contact quality?
Joe WB9SBD
Sent via AMSAT-BB@amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
It's about 20 dB more path loss to the moon than to geosynchronous orbit. So if you need 5-10 watts of RF to a small dish for the geosynchronous satellite, you'd need 1000w to the same dish or a much larger dish to reach a transponder on the moon.
Not to mention the delay for a signal to the moon and back is 2.6 seconds compared to about 240 ms for a signal to and from a geosynchronous satellite.
73,
Paul, N8HM
On Sat, Nov 7, 2015 at 3:00 PM, Joe nss@mwt.net wrote:
oops I missed Now drop the same transponder on the moon,, and how much more is needed?
Joe WB9SBD Sig The Original Rolling Ball Clock Idle Tyme Idle-Tyme.com http://www.idle-tyme.com
On 11/7/2015 1:57 PM, Joe wrote:
Can anyone here run a link budget for me?
I'm in an slight heated debate with some people, About how they have heard about the possible Geo synchronous bird coming up, and they are all wondering why don't "THEY" I like the "THEY" part, anyway why don't they just put it on the moon.
I gave them several reasons why a Geo bird is better,
1- It is there 24/7 where the moon is visible less than 50% of the day
2- the Geo bird doesn't move ( or extremely little) so set the antenna and forget it. Where the moon requires tracking programs and antennas that can move in AZ and EL
3- Useable "Window" The amount of the earths surface that can see either is soo close to the same why bother I bet a geo bird would be at least close to 90% of what the moon see's
4- And finally antennas and power required. The moon being soooo much farther away the amount of power needed each way has to be MUCH more. And thats what I was wondering say you had a nice decent transponder in Geo orbit. what power levels say ERP I guess is needed each way? then drop the same transponder and how much more erp each way will be needed to have the same level of contact quality?
Joe WB9SBD
Sent via AMSAT-BB@amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
Sent via AMSAT-BB@amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
Hi Joe,
if they or you would like to play with numbers I can thoroughly recommend a number of Jan King's spreadsheets we are hosted here http://www.amsatuk.me.uk/iaru/spreadsheet.htm
Of course not only the moon much further away but it gets mighty cold on the surface when it is in eclipse...
73
Graham G3VZV
-----Original Message----- From: Joe Sent: Saturday, November 07, 2015 7:57 PM To: amsat-bb@amsat.org Subject: [amsat-bb] Link Budget
Can anyone here run a link budget for me?
I'm in an slight heated debate with some people, About how they have heard about the possible Geo synchronous bird coming up, and they are all wondering why don't "THEY" I like the "THEY" part, anyway why don't they just put it on the moon.
I gave them several reasons why a Geo bird is better,
1- It is there 24/7 where the moon is visible less than 50% of the day
2- the Geo bird doesn't move ( or extremely little) so set the antenna and forget it. Where the moon requires tracking programs and antennas that can move in AZ and EL
3- Useable "Window" The amount of the earths surface that can see either is soo close to the same why bother I bet a geo bird would be at least close to 90% of what the moon see's
4- And finally antennas and power required. The moon being soooo much farther away the amount of power needed each way has to be MUCH more. And thats what I was wondering say you had a nice decent transponder in Geo orbit. what power levels say ERP I guess is needed each way? then drop the same transponder and how much more erp each way will be needed to have the same level of contact quality?
Joe WB9SBD
_______________________________________________ Sent via AMSAT-BB@amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
An overview of the Phase 4 link was presented this week at the Palomar Amateur Radio Club. The video from the meeting is at: https://youtu.be/-pjsS4OLg8w It explains a bit more than can be covered in an e-mail.
-- 73 de JoAnne K9JKM k9jkm@amsat.org
-----Original Message----- From: AMSAT-BB [mailto:amsat-bb-bounces@amsat.org] On Behalf Of Joe Sent: Saturday, November 07, 2015 1:57 PM To: amsat-bb@amsat.org Subject: [amsat-bb] Link Budget
Can anyone here run a link budget for me?
While it appears that you are right about the link budget, one of you arguments holds only *some* water, and that is tracking. GeoSTATIONARY birds would require to tracking, but there are geosynchronous orbits (i.e. 24 hours, but not necessarily 0 inclination and 0 eccentricity) which would move north/south or east/west in the sky over the course of a day.
And regarding the moon: Another argument against it is that it is darned hard to land on the moon. Lots more deltaV required.
73,
Burns W2BFJ
On Sat, Nov 7, 2015 at 2:57 PM, Joe nss@mwt.net wrote:
Can anyone here run a link budget for me?
I'm in an slight heated debate with some people, About how they have heard about the possible Geo synchronous bird coming up, and they are all wondering why don't "THEY" I like the "THEY" part, anyway why don't they just put it on the moon.
I gave them several reasons why a Geo bird is better,
1- It is there 24/7 where the moon is visible less than 50% of the day
2- the Geo bird doesn't move ( or extremely little) so set the antenna and forget it. Where the moon requires tracking programs and antennas that can move in AZ and EL
3- Useable "Window" The amount of the earths surface that can see either is soo close to the same why bother I bet a geo bird would be at least close to 90% of what the moon see's
4- And finally antennas and power required. The moon being soooo much farther away the amount of power needed each way has to be MUCH more. And thats what I was wondering say you had a nice decent transponder in Geo orbit. what power levels say ERP I guess is needed each way? then drop the same transponder and how much more erp each way will be needed to have the same level of contact quality?
Joe WB9SBD
Sent via AMSAT-BB@amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
Fudge. That is GeoSTATIONARY birds would require *no* tracking....
On Sat, Nov 7, 2015 at 3:28 PM, Burns Fisher burns@fisher.cc wrote:
While it appears that you are right about the link budget, one of you arguments holds only *some* water, and that is tracking. GeoSTATIONARY birds would require to tracking, but there are geosynchronous orbits (i.e. 24 hours, but not necessarily 0 inclination and 0 eccentricity) which would move north/south or east/west in the sky over the course of a day.
And regarding the moon: Another argument against it is that it is darned hard to land on the moon. Lots more deltaV required.
73,
Burns W2BFJ
On Sat, Nov 7, 2015 at 2:57 PM, Joe nss@mwt.net wrote:
Can anyone here run a link budget for me?
I'm in an slight heated debate with some people, About how they have heard about the possible Geo synchronous bird coming up, and they are all wondering why don't "THEY" I like the "THEY" part, anyway why don't they just put it on the moon.
I gave them several reasons why a Geo bird is better,
1- It is there 24/7 where the moon is visible less than 50% of the day
2- the Geo bird doesn't move ( or extremely little) so set the antenna and forget it. Where the moon requires tracking programs and antennas that can move in AZ and EL
3- Useable "Window" The amount of the earths surface that can see either is soo close to the same why bother I bet a geo bird would be at least close to 90% of what the moon see's
4- And finally antennas and power required. The moon being soooo much farther away the amount of power needed each way has to be MUCH more. And thats what I was wondering say you had a nice decent transponder in Geo orbit. what power levels say ERP I guess is needed each way? then drop the same transponder and how much more erp each way will be needed to have the same level of contact quality?
Joe WB9SBD
Sent via AMSAT-BB@amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
Actually, we are working on one that will be orbiting the Moon...
Jerry N0JY
On Nov 7, 2015 1:57 PM, Joe nss@mwt.net wrote:
Can anyone here run a link budget for me?
I'm in an slight heated debate with some people, About how they have heard about the possible Geo synchronous bird coming up, and they are all wondering why don't "THEY" I like the "THEY" part, anyway why don't they just put it on the moon.
I gave them several reasons why a Geo bird is better,
1- It is there 24/7 where the moon is visible less than 50% of the day
2- the Geo bird doesn't move ( or extremely little) so set the antenna and forget it. Where the moon requires tracking programs and antennas that can move in AZ and EL
3- Useable "Window" The amount of the earths surface that can see either is soo close to the same why bother I bet a geo bird would be at least close to 90% of what the moon see's
4- And finally antennas and power required. The moon being soooo much farther away the amount of power needed each way has to be MUCH more. And thats what I was wondering say you had a nice decent transponder in Geo orbit. what power levels say ERP I guess is needed each way? then drop the same transponder and how much more erp each way will be needed to have the same level of contact quality?
Joe WB9SBD
Sent via AMSAT-BB@amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
what kind of ground station will be needed? Sig The Original Rolling Ball Clock Idle Tyme Idle-Tyme.com http://www.idle-tyme.com On 11/7/2015 2:45 PM, Jerry Buxton wrote:
Actually, we are working on one that will be orbiting the Moon...
Jerry N0JY
On Nov 7, 2015 1:57 PM, Joe nss@mwt.net wrote:
Can anyone here run a link budget for me?
I'm in an slight heated debate with some people, About how they have heard about the possible Geo synchronous bird coming up, and they are all wondering why don't "THEY" I like the "THEY" part, anyway why don't they just put it on the moon.
I gave them several reasons why a Geo bird is better,
1- It is there 24/7 where the moon is visible less than 50% of the day
2- the Geo bird doesn't move ( or extremely little) so set the antenna and forget it. Where the moon requires tracking programs and antennas that can move in AZ and EL
3- Useable "Window" The amount of the earths surface that can see either is soo close to the same why bother I bet a geo bird would be at least close to 90% of what the moon see's
4- And finally antennas and power required. The moon being soooo much farther away the amount of power needed each way has to be MUCH more. And thats what I was wondering say you had a nice decent transponder in Geo orbit. what power levels say ERP I guess is needed each way? then drop the same transponder and how much more erp each way will be needed to have the same level of contact quality?
Joe WB9SBD
Sent via AMSAT-BB@amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
Sent via AMSAT-BB@amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
Joe And Others for many years I have Heard thoughts about a Geo synchronous well mostly it was the cost, But I also heard a lot of people say if We had a Geo type bird We would have the people who like to setting us Big ants lots of power and just set and be on the birds all the time . Unfortunately I know We do have this type on the air I haves no idea if this would actually happen or not
73 De Don KA9QJG
-----Original Message----- From: AMSAT-BB [mailto:amsat-bb-bounces@amsat.org] On Behalf Of Joe Sent: Saturday, November 07, 2015 1:58 PM To: amsat-bb@amsat.org Subject: [amsat-bb] Link Budget
Can anyone here run a link budget for me?
I'm in an slight heated debate with some people, About how they have heard about the possible Geo synchronous bird coming up, and they are all wondering why don't "THEY" I like the "THEY" part, anyway why don't they just put it on the moon.
I gave them several reasons why a Geo bird is better,
1- It is there 24/7 where the moon is visible less than 50% of the day
2- the Geo bird doesn't move ( or extremely little) so set the antenna and forget it. Where the moon requires tracking programs and antennas that can move in AZ and EL
3- Useable "Window" The amount of the earths surface that can see either is soo close to the same why bother I bet a geo bird would be at least close to 90% of what the moon see's
4- And finally antennas and power required. The moon being soooo much farther away the amount of power needed each way has to be MUCH more. And thats what I was wondering say you had a nice decent transponder in Geo orbit. what power levels say ERP I guess is needed each way? then drop the same transponder and how much more erp each way will be needed to have the same level of contact quality?
Joe WB9SBD
_______________________________________________ Sent via AMSAT-BB@amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
The good thing is that high power at 5 GHz is expensive, so I doubt anyone will be running too much more than they have to on P4B!
73,
Paul, N8HM
On Sat, Nov 7, 2015 at 4:10 PM, KA9QJG KA9QJG@comcast.net wrote:
Joe And Others for many years I have Heard thoughts about a Geo synchronous well mostly it was the cost, But I also heard a lot of people say if We had a Geo type bird We would have the people who like to setting us Big ants lots of power and just set and be on the birds all the time . Unfortunately I know We do have this type on the air I haves no idea if this would actually happen or not
73 De Don KA9QJG
-----Original Message----- From: AMSAT-BB [mailto:amsat-bb-bounces@amsat.org] On Behalf Of Joe Sent: Saturday, November 07, 2015 1:58 PM To: amsat-bb@amsat.org Subject: [amsat-bb] Link Budget
Can anyone here run a link budget for me?
I'm in an slight heated debate with some people, About how they have heard about the possible Geo synchronous bird coming up, and they are all wondering why don't "THEY" I like the "THEY" part, anyway why don't they just put it on the moon.
I gave them several reasons why a Geo bird is better,
1- It is there 24/7 where the moon is visible less than 50% of the day
2- the Geo bird doesn't move ( or extremely little) so set the antenna and forget it. Where the moon requires tracking programs and antennas that can move in AZ and EL
3- Useable "Window" The amount of the earths surface that can see either is soo close to the same why bother I bet a geo bird would be at least close to 90% of what the moon see's
4- And finally antennas and power required. The moon being soooo much farther away the amount of power needed each way has to be MUCH more. And thats what I was wondering say you had a nice decent transponder in Geo orbit. what power levels say ERP I guess is needed each way? then drop the same transponder and how much more erp each way will be needed to have the same level of contact quality?
Joe WB9SBD
Sent via AMSAT-BB@amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
Sent via AMSAT-BB@amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
Why not L/S on a geo bird? I may have missed the memo on that idea. Many of us still have AO40 (sobsob) gear. 73 Bob W7LRD
----- Original Message -----
From: "Paul Stoetzer" n8hm@arrl.net To: "KA9QJG" KA9QJG@comcast.net Cc: "Joe" nss@mwt.net, "amsat-bb@amsat.org" AMSAT-BB@amsat.org Sent: Saturday, November 7, 2015 1:22:13 PM Subject: Re: [amsat-bb] Link Budget
The good thing is that high power at 5 GHz is expensive, so I doubt anyone will be running too much more than they have to on P4B!
73,
Paul, N8HM
On Sat, Nov 7, 2015 at 4:10 PM, KA9QJG KA9QJG@comcast.net wrote:
Joe And Others for many years I have Heard thoughts about a Geo synchronous well mostly it was the cost, But I also heard a lot of people say if We had a Geo type bird We would have the people who like to setting us Big ants lots of power and just set and be on the birds all the time . Unfortunately I know We do have this type on the air I haves no idea if this would actually happen or not
73 De Don KA9QJG
-----Original Message----- From: AMSAT-BB [mailto:amsat-bb-bounces@amsat.org] On Behalf Of Joe Sent: Saturday, November 07, 2015 1:58 PM To: amsat-bb@amsat.org Subject: [amsat-bb] Link Budget
Can anyone here run a link budget for me?
I'm in an slight heated debate with some people, About how they have heard about the possible Geo synchronous bird coming up, and they are all wondering why don't "THEY" I like the "THEY" part, anyway why don't they just put it on the moon.
I gave them several reasons why a Geo bird is better,
1- It is there 24/7 where the moon is visible less than 50% of the day
2- the Geo bird doesn't move ( or extremely little) so set the antenna and forget it. Where the moon requires tracking programs and antennas that can move in AZ and EL
3- Useable "Window" The amount of the earths surface that can see either is soo close to the same why bother I bet a geo bird would be at least close to 90% of what the moon see's
4- And finally antennas and power required. The moon being soooo much farther away the amount of power needed each way has to be MUCH more. And thats what I was wondering say you had a nice decent transponder in Geo orbit. what power levels say ERP I guess is needed each way? then drop the same transponder and how much more erp each way will be needed to have the same level of contact quality?
Joe WB9SBD
Sent via AMSAT-BB@amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
Sent via AMSAT-BB@amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
_______________________________________________ Sent via AMSAT-BB@amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
Not enough space for the antennas is the big reason. Then there's the issue of S band downlink from GEO being unusable due to terrestrial QRM from WiFi and ISM devices.
Also, it's not impossible that we could lose the amateur satellite service allocation at 1260 MHz due to Galileo. Some European authorities are already restricting amateur operations there (even though Galileo receivers were supposed to be able to coexist with other users of the band).
Don't get rid of it yet. Maybe P3E will be able to carry L/S. Bands haven't been determined yet. There's still the issue of terrestrial QRM at S band though. Even so, maybe the L band uplink will be available and you'll just need to swap out the LNB and preamp on your receive system to receive 10 GHz.
And remember you'll be able to play around with your L band uplink system on Fox-1Cliff and Fox-1D.
73,
Paul, N8HM
On Saturday, November 7, 2015, Bob- W7LRD w7lrd@comcast.net wrote:
Why not L/S on a geo bird? I may have missed the memo on that idea. Many of us still have AO40 (sobsob) gear. 73 Bob W7LRD
*From: *"Paul Stoetzer" <n8hm@arrl.net javascript:_e(%7B%7D,'cvml','n8hm@arrl.net');> *To: *"KA9QJG" <KA9QJG@comcast.net javascript:_e(%7B%7D,'cvml','KA9QJG@comcast.net');> *Cc: *"Joe" <nss@mwt.net javascript:_e(%7B%7D,'cvml','nss@mwt.net');>, " amsat-bb@amsat.org javascript:_e(%7B%7D,'cvml','amsat-bb@amsat.org');" < AMSAT-BB@amsat.org javascript:_e(%7B%7D,'cvml','AMSAT-BB@amsat.org');> *Sent: *Saturday, November 7, 2015 1:22:13 PM *Subject: *Re: [amsat-bb] Link Budget
The good thing is that high power at 5 GHz is expensive, so I doubt anyone will be running too much more than they have to on P4B!
73,
Paul, N8HM
On Sat, Nov 7, 2015 at 4:10 PM, KA9QJG <KA9QJG@comcast.net javascript:_e(%7B%7D,'cvml','KA9QJG@comcast.net');> wrote:
Joe And Others for many years I have Heard thoughts about a Geo
synchronous
well mostly it was the cost, But I also heard a lot of people say if
We
had a Geo type bird We would have the people who like to setting us Big
ants
lots of power and just set and be on the birds all the time . Unfortunately I know We do have this type on the air I haves no idea if
this
would actually happen or not
73 De Don KA9QJG
-----Original Message----- From: AMSAT-BB [mailto:amsat-bb-bounces@amsat.org
javascript:_e(%7B%7D,'cvml','amsat-bb-bounces@amsat.org');] On Behalf Of Joe
Sent: Saturday, November 07, 2015 1:58 PM To: amsat-bb@amsat.org
javascript:_e(%7B%7D,'cvml','amsat-bb@amsat.org');
Subject: [amsat-bb] Link Budget
Can anyone here run a link budget for me?
I'm in an slight heated debate with some people, About how they have
heard
about the possible Geo synchronous bird coming up, and they are all wondering why don't "THEY" I like the "THEY" part, anyway why don't they just put it on the moon.
I gave them several reasons why a Geo bird is better,
1- It is there 24/7 where the moon is visible less than 50% of the day
2- the Geo bird doesn't move ( or extremely little) so set the antenna
and
forget it. Where the moon requires tracking programs and antennas that
can
move in AZ and EL
3- Useable "Window" The amount of the earths surface that can see either
is
soo close to the same why bother I bet a geo bird would be at least
close to
90% of what the moon see's
4- And finally antennas and power required. The moon being soooo much farther away the amount of power needed each way has to be MUCH more. And thats what I was wondering say you had a nice decent transponder in
Geo
orbit. what power levels say ERP I guess is needed each way? then drop
the
same transponder and how much more erp each way will be needed to have
the
same level of contact quality?
Joe WB9SBD
Sent via AMSAT-BB@amsat.org
javascript:_e(%7B%7D,'cvml','AMSAT-BB@amsat.org');. AMSAT-NA makes this open forum available to all
interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite
program!
Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
Sent via AMSAT-BB@amsat.org
javascript:_e(%7B%7D,'cvml','AMSAT-BB@amsat.org');. AMSAT-NA makes this open forum available
to all interested persons worldwide without requiring membership.
Opinions expressed
are solely those of the author, and do not reflect the official views of
AMSAT-NA.
Not an AMSAT-NA member? Join now to support the amateur satellite
program!
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Agreed ! Bob is so dead on this. Seems that LOW EARTH ORBIT for some reason is stuck in a lot of heads. AO-40 was so much fun and so easy to use.
John, W0JAB
On 11/7/2015 3:46 PM, Bob- W7LRD wrote:
Why not L/S on a geo bird? I may have missed the memo on that idea. Many of us still have AO40 (sobsob) gear.
AMSAT has two serious projects underway - for both GEO and HEO.
There aren't many details available at this point. P4B, in a geosynchronous orbit will be 5 GHz up and 10 GHz down. Bands for P3E, going to a Molniya orbit, have not been determined yet.
Not only that, but AMSAT's partnership with Ragnarok for the Lunar CubeQuest challenge could result in a transponder in lunar orbit, which would be an interesting challenge. Again that will use 5 GHz up and 10 GHz down.
And AMSAT is continuing with LEO projects, of course. Fox-1Cliff and Fox-1D launch 1Q 2016. RadFXSat (Fox-1B) launches November 2016 and Fox-1E is also being worked on.
Lots of exciting stuff in progress over the next few years!
73,
Paul, N8HM
On Saturday, November 7, 2015, John Becker w0jab@big-river.net wrote:
Agreed ! Bob is so dead on this. Seems that LOW EARTH ORBIT for some reason is stuck in a lot of heads. AO-40 was so much fun and so easy to use.
John, W0JAB
On 11/7/2015 3:46 PM, Bob- W7LRD wrote:
Why not L/S on a geo bird? I may have missed the memo on that idea. Many of us still have AO40 (sobsob) gear.
Sent via AMSAT-BB@amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
participants (9)
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Bob- W7LRD -
Burns Fisher -
Graham Shirville -
Jerry Buxton -
JoAnne Maenpaa -
Joe -
John Becker -
KA9QJG -
Paul Stoetzer