Bob, Regarding your Cu wire dish... you might look at the Tek Sharp dishes as an easier alternative to "rolling your own." I picked one up on ebay about a year ago and put it in my attic... waiting for amsat-dl :-)
http://www.plumdragon.com/teksharp/hr_AO-40_products.htm
Drew, I have a spare PF dish about 60 cm, but it is steel, not aluminum like the G3RUH. I used it on AO-40 for 24 GHz. Let me know off-list if you want it.
73, Jerry, K5OE
---- previous message ---- You probably have one of the K5GNA "BBQ" dishes. The G3RUH is a solid round spun dish.
73, Drew
-----Original Message-----
From: Bob Bruninga bruninga@usna.edu Sent: Jan 3, 2012 2:19 PM To: 'Andrew Glasbrenner' glasbrenner@mindspring.com, 'amsat-bb' amsat-bb@amsat.org Subject: RE: [amsat-bb] Looking for a G3RUH dish
I'm looking for one of the 60cm G3RUH dishes
Got one, (but not available).
Questions: I measured reflector grid separation as .88 inches which works out to be about 0.18 wavelength. I always thought the grid had to be tighter than 0.1 inches to be an effective "surface".
Maybe the difference with almost double the spacing is not that significant? (especially for a steel one which would be quite heavy.
Reason I am asking is that I also need another S band dish (at 70 MPH on the roof of a tracking van) and we are thinking about building one by using an old solid 6' TVRO dish as a form and laying in copper wire and soldering it to copper straps. With all that labor, I'd not want to get the spacing wrong.
Bob, Wb4APR
Regarding your Cu wire dish... you might look at the Tek Sharp dishes as an easier alternative to "rolling your own."
We are after absolute minimum wind drag. I don't think the Tek dish would survive accurate tracking while driving along the interstate at 70 PMPH to catch a balloon. And we want it to be a good 3' by 4' dish... Need the gain for the tiny wifi video link...
Bob
I picked one up on ebay about a year ago and put it in my attic... waiting for amsat-dl :-)
http://www.plumdragon.com/teksharp/hr_AO-40_products.htm
Drew, I have a spare PF dish about 60 cm, but it is steel, not aluminum like the G3RUH. I used it on AO-40 for 24 GHz. Let me know off-list if you want it.
73, Jerry, K5OE
---- previous message ---- You probably have one of the K5GNA "BBQ" dishes. The G3RUH is a solid round spun dish.
73, Drew
-----Original Message-----
From: Bob Bruninga bruninga@usna.edu Sent: Jan 3, 2012 2:19 PM To: 'Andrew Glasbrenner' glasbrenner@mindspring.com, 'amsat-bb' amsat-bb@amsat.org Subject: RE: [amsat-bb] Looking for a G3RUH dish
I'm looking for one of the 60cm G3RUH dishes
Got one, (but not available).
Questions: I measured reflector grid separation as .88 inches which works out to be about 0.18 wavelength. I always thought the grid had to be tighter than 0.1 inches to be an effective "surface".
Maybe the difference with almost double the spacing is not that
significant?
(especially for a steel one which would be quite heavy.
Reason I am asking is that I also need another S band dish (at 70 MPH on
the
roof of a tracking van) and we are thinking about building one by using an old solid 6' TVRO dish as a form and laying in copper wire and soldering it to copper straps. With all that labor, I'd not want to get the spacing wrong.
Bob, Wb4APR
_______________________________________________ Sent via AMSAT-BB@amsat.org. 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 at Spectrum International used to sell a strong 3 foot mesh dish for HRPT (WX).
Jeff K2SDR
-----Original Message----- From: Bob Bruninga Sent: Wednesday, January 04, 2012 5:54 PM To: 'K5OE' ; amsat-bb@amsat.org Subject: [amsat-bb] Re: Looking for a G3RUH dish
Regarding your Cu wire dish... you might look at the Tek Sharp dishes as an easier alternative to "rolling your own."
We are after absolute minimum wind drag. I don't think the Tek dish would survive accurate tracking while driving along the interstate at 70 PMPH to catch a balloon. And we want it to be a good 3' by 4' dish... Need the gain for the tiny wifi video link...
Bob
I picked one up on ebay about a year ago and put it in my attic... waiting for amsat-dl :-)
http://www.plumdragon.com/teksharp/hr_AO-40_products.htm
Drew, I have a spare PF dish about 60 cm, but it is steel, not aluminum like the G3RUH. I used it on AO-40 for 24 GHz. Let me know off-list if you want it.
73, Jerry, K5OE
---- previous message ---- You probably have one of the K5GNA "BBQ" dishes. The G3RUH is a solid round spun dish.
73, Drew
-----Original Message-----
From: Bob Bruninga bruninga@usna.edu Sent: Jan 3, 2012 2:19 PM To: 'Andrew Glasbrenner' glasbrenner@mindspring.com, 'amsat-bb' amsat-bb@amsat.org Subject: RE: [amsat-bb] Looking for a G3RUH dish
I'm looking for one of the 60cm G3RUH dishes
Got one, (but not available).
Questions: I measured reflector grid separation as .88 inches which works out to be about 0.18 wavelength. I always thought the grid had to be tighter than 0.1 inches to be an effective "surface".
Maybe the difference with almost double the spacing is not that
significant?
(especially for a steel one which would be quite heavy.
Reason I am asking is that I also need another S band dish (at 70 MPH on
the
roof of a tracking van) and we are thinking about building one by using an old solid 6' TVRO dish as a form and laying in copper wire and soldering it to copper straps. With all that labor, I'd not want to get the spacing wrong.
Bob, Wb4APR
_______________________________________________ Sent via AMSAT-BB@amsat.org. 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 AMSAT-BB@amsat.org. 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
Hi Bob,
I'm trying to visualize you driving (bouncing) down the freeway at 70 mph with a square yard of curved (airfoil!) metal sitting at odd angles to the air flow, trying to aim it at a target you may not be able to see clearly, which is also moving at some rate in another direction, with an accuracy of +/- a half dozen degrees (which is what you get with a dish that size). I had a hard enough time aiming my 30 inch BBQ grill at AO-40, from my nearly stationary house (this is California, after all), with up to date KEPS, a rotor system calibrated earlier against the position of the Sun, NBS-sync'd clock on a Linux PC, and so forth.
Even if you mount the dish inside a camper minivan with a fiberglass roof (think mobile Radome), I don't see how this is going to work. I've seen you do amazing things, but what are you thinking?
The best use of the dish would probably be to catch the balloon payload as it falls from the sky...
Greg KO6TH
From: bruninga@usna.edu To: k5oe@aol.com; amsat-bb@amsat.org Date: Wed, 4 Jan 2012 17:54:02 -0500 Subject: [amsat-bb] Re: Looking for a G3RUH dish
Regarding your Cu wire dish... you might look at the Tek Sharp dishes as an easier alternative to "rolling your own."
We are after absolute minimum wind drag. I don't think the Tek dish would survive accurate tracking while driving along the interstate at 70 PMPH to catch a balloon. And we want it to be a good 3' by 4' dish... Need the gain for the tiny wifi video link...
Bob
I picked one up on ebay about a year ago and put it in my attic... waiting for amsat-dl :-)
http://www.plumdragon.com/teksharp/hr_AO-40_products.htm
Drew, I have a spare PF dish about 60 cm, but it is steel, not aluminum like the G3RUH. I used it on AO-40 for 24 GHz. Let me know off-list if you want it.
73, Jerry, K5OE
---- previous message ---- You probably have one of the K5GNA "BBQ" dishes. The G3RUH is a solid round spun dish.
73, Drew
-----Original Message-----
From: Bob Bruninga bruninga@usna.edu Sent: Jan 3, 2012 2:19 PM To: 'Andrew Glasbrenner' glasbrenner@mindspring.com, 'amsat-bb' amsat-bb@amsat.org Subject: RE: [amsat-bb] Looking for a G3RUH dish
I'm looking for one of the 60cm G3RUH dishes
Got one, (but not available).
Questions: I measured reflector grid separation as .88 inches which works out to be about 0.18 wavelength. I always thought the grid had to be tighter than 0.1 inches to be an effective "surface".
Maybe the difference with almost double the spacing is not that
significant?
(especially for a steel one which would be quite heavy.
Reason I am asking is that I also need another S band dish (at 70 MPH on
the
roof of a tracking van) and we are thinking about building one by using an old solid 6' TVRO dish as a form and laying in copper wire and soldering it to copper straps. With all that labor, I'd not want to get the spacing wrong.
Bob, Wb4APR
Sent via AMSAT-BB@amsat.org. 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 AMSAT-BB@amsat.org. 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
Speaking of which, can any of the available amateur software packages handle a moving ground station? I'd like to be able to automate the antenna tracking on a boat.
73, doug
On 05-Jan-12 05:55, Greg D. wrote:
Hi Bob,
I'm trying to visualize you driving (bouncing) down the freeway at 70 mph with a square yard of curved (airfoil!) metal sitting at odd angles to the air flow, trying to aim it at a target you may not be able to see clearly, which is also moving at some rate in another direction, with an accuracy of +/- a half dozen degrees (which is what you get with a dish that size). I had a hard enough time aiming my 30 inch BBQ grill at AO-40, from my nearly stationary house (this is California, after all), with up to date KEPS, a rotor system calibrated earlier against the position of the Sun, NBS-sync'd clock on a Linux PC, and so forth.
Even if you mount the dish inside a camper minivan with a fiberglass roof (think mobile Radome), I don't see how this is going to work. I've seen you do amazing things, but what are you thinking?
The best use of the dish would probably be to catch the balloon payload as it falls from the sky...
Greg KO6TH
From: bruninga@usna.edu To: k5oe@aol.com; amsat-bb@amsat.org Date: Wed, 4 Jan 2012 17:54:02 -0500 Subject: [amsat-bb] Re: Looking for a G3RUH dish
Regarding your Cu wire dish... you might look at the Tek Sharp dishes as an easier alternative to "rolling your own."
We are after absolute minimum wind drag. I don't think the Tek dish would survive accurate tracking while driving along the interstate at 70 PMPH to catch a balloon. And we want it to be a good 3' by 4' dish... Need the gain for the tiny wifi video link...
Bob
I picked one up on ebay about a year ago and put it in my attic... waiting for amsat-dl :-)
http://www.plumdragon.com/teksharp/hr_AO-40_products.htm
Drew, I have a spare PF dish about 60 cm, but it is steel, not aluminum like the G3RUH. I used it on AO-40 for 24 GHz. Let me know off-list if you want it.
73, Jerry, K5OE
---- previous message ---- You probably have one of the K5GNA "BBQ" dishes. The G3RUH is a solid round spun dish.
73, Drew
-----Original Message-----
From: Bob Bruningabruninga@usna.edu Sent: Jan 3, 2012 2:19 PM To: 'Andrew Glasbrenner'glasbrenner@mindspring.com, 'amsat-bb' amsat-bb@amsat.org Subject: RE: [amsat-bb] Looking for a G3RUH dish
I'm looking for one of the 60cm G3RUH dishes
Got one, (but not available).
Questions: I measured reflector grid separation as .88 inches which works out to be about 0.18 wavelength. I always thought the grid had to be tighter than 0.1 inches to be an effective "surface".
Maybe the difference with almost double the spacing is not that
significant?
(especially for a steel one which would be quite heavy.
Reason I am asking is that I also need another S band dish (at 70 MPH on
the
roof of a tracking van) and we are thinking about building one by using an old solid 6' TVRO dish as a form and laying in copper wire and soldering it to copper straps. With all that labor, I'd not want to get the spacing wrong.
Bob, Wb4APR
Sent via AMSAT-BB@amsat.org. 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 AMSAT-BB@amsat.org. 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 AMSAT-BB@amsat.org. 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
Hi Doug,
You might check out Lynn KJ4ERJ's APRSISCE/32 package. The development version can track satellites, and as an APRS App it's dynamically self-position aware by default. I don't think it currently outputs to anything that can drive an antenna or Doppler tracking, but the program is under active development and it's rumored that he can be bribed to make enhancements with suitable quantities of Mountain Dew. Even so, you will need to be creative in the lash-up.
Greg KO6TH
Date: Thu, 5 Jan 2012 06:39:29 +0000 From: faunt@panix.com To: amsat-bb@amsat.org Subject: [amsat-bb] Re: Looking for a G3RUH dish
Speaking of which, can any of the available amateur software packages handle a moving ground station? I'd like to be able to automate the antenna tracking on a boat.
73, doug
Greg thaks for posting this. It works better than ANY APRS client I have seen. I just blew Xastir off my drive.
Ronny
K4RJJ
----- Original Message -----
From: "Greg D." ko6th_greg@hotmail.com To: faunt@panix.com, amsat-bb@amsat.org Sent: Thursday, January 5, 2012 3:02:21 AM Subject: [amsat-bb] Re: Looking for a G3RUH dish
Hi Doug,
You might check out Lynn KJ4ERJ's APRSISCE/32 package. The development version can track satellites, and as an APRS App it's dynamically self-position aware by default. I don't think it currently outputs to anything that can drive an antenna or Doppler tracking, but the program is under active development and it's rumored that he can be bribed to make enhancements with suitable quantities of Mountain Dew. Even so, you will need to be creative in the lash-up.
Greg KO6TH
Date: Thu, 5 Jan 2012 06:39:29 +0000 From: faunt@panix.com To: amsat-bb@amsat.org Subject: [amsat-bb] Re: Looking for a G3RUH dish
Speaking of which, can any of the available amateur software packages handle a moving ground station? I'd like to be able to automate the antenna tracking on a boat.
73, doug
_______________________________________________ Sent via AMSAT-BB@amsat.org. 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
Doug,
FODTRACK does have a GPS input for the location.
http://ludens.cl/Electron/fodtrack/fodtrack.html
Note that it is a VERY old, DOS program, but according to the web page, with some effort will work with Vista and presumably WIN7. FWIW
Alan WA4SCA
-----Original Message----- From: amsat-bb-bounces@amsat.org [mailto:amsat-bb-bounces@amsat.org] On Behalf Of Doug Faunt N6TQS +1-510-655-8604 Sent: Thursday, January 05, 2012 12:39 AM To: amsat-bb@amsat.org Subject: [amsat-bb] Re: Looking for a G3RUH dish
Speaking of which, can any of the available amateur software packages handle a moving ground station? I'd like to be able to automate the antenna tracking on a boat.
73, doug
On 05-Jan-12 05:55, Greg D. wrote:
Hi Bob,
I'm trying to visualize you driving (bouncing) down the freeway at 70 mph
with a square yard of curved (airfoil!) metal sitting at odd angles to the air flow, trying to aim it at a target you may not be able to see clearly, which is also moving at some rate in another direction, with an accuracy of +/- a half dozen degrees (which is what you get with a dish that size). I had a hard enough time aiming my 30 inch BBQ grill at AO-40, from my nearly stationary house (this is California, after all), with up to date KEPS, a rotor system calibrated earlier against the position of the Sun, NBS-sync'd clock on a Linux PC, and so forth.
Even if you mount the dish inside a camper minivan with a fiberglass roof
(think mobile Radome), I don't see how this is going to work. I've seen you do amazing things, but what are you thinking?
The best use of the dish would probably be to catch the balloon payload as
it falls from the sky...
Greg KO6TH
From: bruninga@usna.edu To: k5oe@aol.com; amsat-bb@amsat.org Date: Wed, 4 Jan 2012 17:54:02 -0500 Subject: [amsat-bb] Re: Looking for a G3RUH dish
Regarding your Cu wire dish... you might look at the Tek Sharp dishes as an easier alternative to "rolling your own."
We are after absolute minimum wind drag. I don't think the Tek dish
would
survive accurate tracking while driving along the interstate at 70 PMPH
to
catch a balloon. And we want it to be a good 3' by 4' dish... Need the gain for the tiny wifi video link...
Bob
I picked one up on ebay about a year ago and put it in my attic...
waiting
for amsat-dl :-)
http://www.plumdragon.com/teksharp/hr_AO-40_products.htm
Drew, I have a spare PF dish about 60 cm, but it is steel, not aluminum like
the
G3RUH. I used it on AO-40 for 24 GHz. Let me know off-list if you want
it.
73, Jerry, K5OE
---- previous message ---- You probably have one of the K5GNA "BBQ" dishes. The G3RUH is a solid
round
spun dish.
73, Drew
-----Original Message-----
From: Bob Bruningabruninga@usna.edu Sent: Jan 3, 2012 2:19 PM To: 'Andrew Glasbrenner'glasbrenner@mindspring.com, 'amsat-bb' amsat-bb@amsat.org Subject: RE: [amsat-bb] Looking for a G3RUH dish
I'm looking for one of the 60cm G3RUH dishes
Got one, (but not available).
Questions: I measured reflector grid separation as .88 inches which
works
out to be about 0.18 wavelength. I always thought the grid had to be tighter than 0.1 inches to be an effective "surface".
Maybe the difference with almost double the spacing is not that
significant?
(especially for a steel one which would be quite heavy.
Reason I am asking is that I also need another S band dish (at 70 MPH on
the
roof of a tracking van) and we are thinking about building one by using
an
old solid 6' TVRO dish as a form and laying in copper wire and soldering
it
to copper straps. With all that labor, I'd not want to get the spacing wrong.
Bob, Wb4APR
Sent via AMSAT-BB@amsat.org. 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 AMSAT-BB@amsat.org. 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 AMSAT-BB@amsat.org. 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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Doug, I worked for Sperry and other maritime electronics companies. Using a satellite tracking antenna on a boat needs to have a North input to have a relative tracking of an object-You can also have a heads up input. There are mobile antennas for the DISH network that can meet your needs, however, you must adapt the "North" input to the trackers. I'm sure you can modify the antenna to make it receive on the proper frequency you desire. They are not cheap, however, if you shop on e-bay, you may find one to fit your needs. Interface to say- PCSAT32 - may be unique. Good luck. 73, Dee, NB2F
-----Original Message----- From: amsat-bb-bounces@amsat.org [mailto:amsat-bb-bounces@amsat.org] On Behalf Of Doug Faunt N6TQS +1-510-655-8604 Sent: Thursday, January 05, 2012 1:39 AM To: amsat-bb@amsat.org Subject: [amsat-bb] Re: Looking for a G3RUH dish
Speaking of which, can any of the available amateur software packages handle a moving ground station? I'd like to be able to automate the antenna tracking on a boat.
73, doug
On 05-Jan-12 05:55, Greg D. wrote:
Hi Bob,
I'm trying to visualize you driving (bouncing) down the freeway at 70
mph with a square yard of curved (airfoil!) metal sitting at odd angles to the air flow, trying to aim it at a target you may not be able to see clearly, which is also moving at some rate in another direction, with an accuracy of +/- a half dozen degrees (which is what you get with a dish that size). I had a hard enough time aiming my 30 inch BBQ grill at AO-40, from my nearly stationary house (this is California, after all), with up to date KEPS, a rotor system calibrated earlier against the position of the Sun, NBS-sync'd clock on a Linux PC, and so forth.
Even if you mount the dish inside a camper minivan with a fiberglass
roof (think mobile Radome), I don't see how this is going to work. I've seen you do amazing things, but what are you thinking?
The best use of the dish would probably be to catch the balloon
payload as it falls from the sky...
Greg KO6TH
From: bruninga@usna.edu To: k5oe@aol.com; amsat-bb@amsat.org Date: Wed, 4 Jan 2012 17:54:02 -0500 Subject: [amsat-bb] Re: Looking for a G3RUH dish
Regarding your Cu wire dish... you might look at the Tek Sharp dishes as an easier alternative to "rolling your own."
We are after absolute minimum wind drag. I don't think the Tek dish would survive accurate tracking while driving along the interstate at
70 PMPH to catch a balloon. And we want it to be a good 3' by 4' dish... Need the gain for the tiny wifi video link...
Bob
I picked one up on ebay about a year ago and put it in my attic... waiting for amsat-dl :-)
http://www.plumdragon.com/teksharp/hr_AO-40_products.htm
Drew, I have a spare PF dish about 60 cm, but it is steel, not aluminum like the G3RUH. I used it on AO-40 for 24 GHz. Let me know off-list
if you want it.
73, Jerry, K5OE
---- previous message ---- You probably have one of the K5GNA "BBQ" dishes. The G3RUH is a solid
round spun dish.
73, Drew
-----Original Message-----
From: Bob Bruningabruninga@usna.edu Sent: Jan 3, 2012 2:19 PM To: 'Andrew Glasbrenner'glasbrenner@mindspring.com, 'amsat-bb' amsat-bb@amsat.org Subject: RE: [amsat-bb] Looking for a G3RUH dish
I'm looking for one of the 60cm G3RUH dishes
Got one, (but not available).
Questions: I measured reflector grid separation as .88 inches which
works out to be about 0.18 wavelength. I always thought the grid had to be tighter than 0.1 inches to be an effective "surface".
Maybe the difference with almost double the spacing is not that
significant?
(especially for a steel one which would be quite heavy.
Reason I am asking is that I also need another S band dish (at 70 MPH on
the
roof of a tracking van) and we are thinking about building one by using an old solid 6' TVRO dish as a form and laying in copper wire and soldering it to copper straps. With all that labor, I'd not want to get the spacing wrong.
Bob, Wb4APR
Sent via AMSAT-BB@amsat.org. 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 AMSAT-BB@amsat.org. 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 AMSAT-BB@amsat.org. 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 AMSAT-BB@amsat.org. 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
The Balloon has APRS on it, so it is telling us where it is. We have GPS, so we know where we are and our heading, a PIC processor takes those two inputs, does the 3D math and points the AZ/EL mount. Again, the dish will be an open-wire grid with nearly 1" spacing and have little drag.
Will have to power the Yaesu mount from a 115v AC inverter because they are AC motors..
Bob, WB4APR
I'm trying to visualize you driving (bouncing) down the freeway at 70 mph
with a square yard of curved (airfoil!) metal sitting at odd angles to the air flow, trying to aim it at a target you may not be able to see clearly, which is also moving at some rate in another direction, with an accuracy of +/- a half dozen degrees (which is what you get with a dish that size). I had a hard enough time aiming my 30 inch BBQ grill at AO-40, from my nearly stationary house (this is California, after all), with up to date KEPS, a rotor system calibrated earlier against the position of the Sun, NBS-sync'd clock on a Linux PC, and so forth.
Even if you mount the dish inside a camper minivan with a fiberglass roof (think mobile Radome), I don't see how this is going to work. I've seen you do amazing things, but what are you thinking?
The best use of the dish would probably be to catch the balloon payload as it falls from the sky...
Greg KO6TH
From: bruninga@usna.edu To: k5oe@aol.com; amsat-bb@amsat.org Date: Wed, 4 Jan 2012 17:54:02 -0500 Subject: [amsat-bb] Re: Looking for a G3RUH dish
Regarding your Cu wire dish... you might look at the Tek Sharp dishes as an easier alternative to "rolling your own."
We are after absolute minimum wind drag. I don't think the Tek dish would survive accurate tracking while driving along the interstate at 70 PMPH to catch a balloon. And we want it to be a good 3' by 4' dish... Need the gain for the tiny wifi video link...
Bob
I picked one up on ebay about a year ago and put it in my attic... waiting for amsat-dl :-)
http://www.plumdragon.com/teksharp/hr_AO-40_products.htm
Drew, I have a spare PF dish about 60 cm, but it is steel, not aluminum like the G3RUH. I used it on AO-40 for 24 GHz. Let me know off-list if you want it.
73, Jerry, K5OE
---- previous message ---- You probably have one of the K5GNA "BBQ" dishes. The G3RUH is a solid
round
spun dish.
73, Drew
-----Original Message-----
From: Bob Bruninga bruninga@usna.edu Sent: Jan 3, 2012 2:19 PM To: 'Andrew Glasbrenner' glasbrenner@mindspring.com, 'amsat-bb' amsat-bb@amsat.org Subject: RE: [amsat-bb] Looking for a G3RUH dish
I'm looking for one of the 60cm G3RUH dishes
Got one, (but not available).
Questions: I measured reflector grid separation as .88 inches which works out to be about 0.18 wavelength. I always thought the grid had to be tighter than 0.1 inches to be an effective "surface".
Maybe the difference with almost double the spacing is not that
significant?
(especially for a steel one which would be quite heavy.
Reason I am asking is that I also need another S band dish (at 70 MPH on
the
roof of a tracking van) and we are thinking about building one by using
an
old solid 6' TVRO dish as a form and laying in copper wire and soldering
it
to copper straps. With all that labor, I'd not want to get the spacing wrong.
Bob, Wb4APR
Sent via AMSAT-BB@amsat.org. 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 AMSAT-BB@amsat.org. 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
I am not sure Tek Sharp continues to make the patch feeds. They certainly do not make the tri-band feed, but I was able to get a dual band patch from them in June 2009 for one of their hardware cloth dishes.
73's, Tim - N8DEU
----- Original Message ----- From: "K5OE" k5oe@aol.com To: amsat-bb@amsat.org Sent: Wednesday, January 04, 2012 4:37 PM Subject: [amsat-bb] Re: Looking for a G3RUH dish
Bob, Regarding your Cu wire dish... you might look at the Tek Sharp dishes as an easier alternative to "rolling your own." I picked one up on ebay about a year ago and put it in my attic... waiting for amsat-dl :-)
http://www.plumdragon.com/teksharp/hr_AO-40_products.htm
Drew, I have a spare PF dish about 60 cm, but it is steel, not aluminum like the G3RUH. I used it on AO-40 for 24 GHz. Let me know off-list if you want it.
73, Jerry, K5OE
---- previous message ---- You probably have one of the K5GNA "BBQ" dishes. The G3RUH is a solid round spun dish.
73, Drew
-----Original Message-----
From: Bob Bruninga bruninga@usna.edu Sent: Jan 3, 2012 2:19 PM To: 'Andrew Glasbrenner' glasbrenner@mindspring.com, 'amsat-bb' amsat-bb@amsat.org Subject: RE: [amsat-bb] Looking for a G3RUH dish
I'm looking for one of the 60cm G3RUH dishes
Got one, (but not available).
Questions: I measured reflector grid separation as .88 inches which works out to be about 0.18 wavelength. I always thought the grid had to be tighter than 0.1 inches to be an effective "surface".
Maybe the difference with almost double the spacing is not that significant? (especially for a steel one which would be quite heavy.
Reason I am asking is that I also need another S band dish (at 70 MPH on the roof of a tracking van) and we are thinking about building one by using an old solid 6' TVRO dish as a form and laying in copper wire and soldering it to copper straps. With all that labor, I'd not want to get the spacing wrong.
Bob, Wb4APR
Sent via AMSAT-BB@amsat.org. 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
Hi, Tim;
We still make the S/L patch feeds and may bring back the tribander, if there's enough demand. We also still produce the 1.2m and 1.8m dish kits and now have a 2.4m kit in the works. It's been the UAV industry that's kept us alive since the failure of AO-40, so our products are now made from aircraft grade aluminum and are milspec Class II gold anodized.
73,
Rick Fletcher, W7YP TekSharp P.O. Box 2789 Columbia Falls, MT 59912 PHN: 406-249-1787 FAX: 406-387-4523
-----Original Message----- From: amsat-bb-bounces@amsat.org [mailto:amsat-bb-bounces@amsat.org] On Behalf Of Tim Cunningham Sent: Wednesday, January 04, 2012 5:15 PM To: amsat-bb@amsat.org Subject: [amsat-bb] Re: Looking for a G3RUH dish
I am not sure Tek Sharp continues to make the patch feeds. They certainly do not make the tri-band feed, but I was able to get a dual band patch from them in June 2009 for one of their hardware cloth dishes.
73's, Tim - N8DEU
----- Original Message ----- From: "K5OE" k5oe@aol.com To: amsat-bb@amsat.org Sent: Wednesday, January 04, 2012 4:37 PM Subject: [amsat-bb] Re: Looking for a G3RUH dish
Bob, Regarding your Cu wire dish... you might look at the Tek Sharp dishes as an easier alternative to "rolling your own." I picked one up on ebay about a year ago and put it in my attic... waiting for amsat-dl :-)
http://www.plumdragon.com/teksharp/hr_AO-40_products.htm
Drew, I have a spare PF dish about 60 cm, but it is steel, not aluminum like the
G3RUH. I used it on AO-40 for 24 GHz. Let me know off-list if you want it.
73, Jerry, K5OE
---- previous message ---- You probably have one of the K5GNA "BBQ" dishes. The G3RUH is a solid round spun dish.
73, Drew
-----Original Message-----
From: Bob Bruninga bruninga@usna.edu Sent: Jan 3, 2012 2:19 PM To: 'Andrew Glasbrenner' glasbrenner@mindspring.com, 'amsat-bb' amsat-bb@amsat.org Subject: RE: [amsat-bb] Looking for a G3RUH dish
I'm looking for one of the 60cm G3RUH dishes
Got one, (but not available).
Questions: I measured reflector grid separation as .88 inches which works out to be about 0.18 wavelength. I always thought the grid had to be tighter than 0.1 inches to be an effective "surface".
Maybe the difference with almost double the spacing is not that significant? (especially for a steel one which would be quite heavy.
Reason I am asking is that I also need another S band dish (at 70 MPH on the roof of a tracking van) and we are thinking about building one by using an old solid 6' TVRO dish as a form and laying in copper wire and soldering it to copper straps. With all that labor, I'd not want to get the spacing wrong.
Bob, Wb4APR
Sent via AMSAT-BB@amsat.org. 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 AMSAT-BB@amsat.org. 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
participants (10)
-
Alan P. Biddle -
Bob Bruninga -
Dee -
Doug Faunt N6TQS +1-510-655-8604 -
Greg D. -
Jeff Kelly -
k4rjj＠comcast.net -
K5OE -
Rick Fletcher -
Tim Cunningham