In putting together my antenna,?? (144-432)I need something to use as a horizontal- cross? support boom. What would be the best length, and,? what would be the minimum length,,,? would 6? ft separation be OK?? To minimize problems, should I mount one beam horizontal, one vertical? Does it matter which one, is? which way?
I doubt I can find a fiberglas boom locally,,,? what else could I use?? or, where can I order a fiberglas boom?
thanks Bob W0DXZ
Hi Bob,
I ordered the fiberglass M2 boom from RANDL.com, item HDFGBOOMKIT (http://www.rlham.com/cgi-bin/shop/modellookup.dbw?MODEL=HDFGBOOMKIT); however, is a bit pricey at $184.95 plus shipping. I have read where other homemade methods have been used with success.
Are you going to use both azimuth and elevation rotors or just azimuth?
73, Jeff - K7WIN
----- Original Message ----- From: w0dxz@aol.com To: amsat-bb@amsat.org Sent: Friday, April 04, 2008 7:36 AM Subject: [amsat-bb] cross boom?
In putting together my antenna,?? (144-432)I need something to use as a horizontal- cross? support boom. What would be the best length, and,? what would be the minimum length,,,? would 6? ft separation be OK?? To minimize problems, should I mount one beam horizontal, one vertical? Does it matter which one, is? which way?
I doubt I can find a fiberglas boom locally,,,? what else could I use?? or, where can I order a fiberglas boom?
thanks Bob W0DXZ _______________________________________________ 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
Pretty simple to make a fiber pole functional equal.
use a pc of schedule 40 PVC pipe. apply a couple of wraps of 5 oz glass cloth using epoxy or polyester resin. The glass will prevent the PVC from sagging and adds great strength.
FWIW
KU8L Curt
K7WIN - Jeff wrote:
Hi Bob,
I ordered the fiberglass M2 boom from RANDL.com, item HDFGBOOMKIT (http://www.rlham.com/cgi-bin/shop/modellookup.dbw?MODEL=HDFGBOOMKIT); however, is a bit pricey at $184.95 plus shipping. I have read where other homemade methods have been used with success.
Are you going to use both azimuth and elevation rotors or just azimuth?
73, Jeff - K7WIN
----- Original Message ----- From: w0dxz@aol.com To: amsat-bb@amsat.org Sent: Friday, April 04, 2008 7:36 AM Subject: [amsat-bb] cross boom?
In putting together my antenna,?? (144-432)I need something to use as a horizontal- cross? support boom. What would be the best length, and,? what would be the minimum length,,,? would 6? ft separation be OK?? To minimize problems, should I mount one beam horizontal, one vertical? Does it matter which one, is? which way?
I doubt I can find a fiberglas boom locally,,,? what else could I use?? or, where can I order a fiberglas boom?
thanks Bob W0DXZ _______________________________________________ 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 had good luck with Schedule 40 and a broomstick, as well. Run the broomstick through the PVC and bolt it twice on each end such that each end has two bolts running through it in a 'cross' configuration.
It's not as light as fiberglass but the rigidity is great for my 2x8element array 25 feet off the ground.
On Fri, Apr 4, 2008 at 12:49 PM, Curt Nixon cptcurt@flash.net wrote:
Pretty simple to make a fiber pole functional equal.
use a pc of schedule 40 PVC pipe. apply a couple of wraps of 5 oz glass cloth using epoxy or polyester resin. The glass will prevent the PVC from sagging and adds great strength.
FWIW
KU8L Curt
K7WIN - Jeff wrote:
Hi Bob,
I ordered the fiberglass M2 boom from RANDL.com, item HDFGBOOMKIT (http://www.rlham.com/cgi-bin/shop/modellookup.dbw?MODEL=HDFGBOOMKIT); however, is a bit pricey at $184.95 plus shipping. I have read where
other
homemade methods have been used with success.
Are you going to use both azimuth and elevation rotors or just azimuth?
73, Jeff - K7WIN
----- Original Message ----- From: w0dxz@aol.com To: amsat-bb@amsat.org Sent: Friday, April 04, 2008 7:36 AM Subject: [amsat-bb] cross boom?
In putting together my antenna,?? (144-432)I need something to use as a horizontal- cross? support boom. What would be the best length, and,?
what
would be the minimum length,,,? would 6? ft separation be OK?? To
minimize
problems, should I mount one beam horizontal, one vertical? Does it
matter
which one, is? which way?
I doubt I can find a fiberglas boom locally,,,? what else could I use?? or, where can I order a fiberglas boom?
thanks Bob W0DXZ _______________________________________________ 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
Max-Gain Systems has some great quality stuff at very reasonable prices. http://www.mgs4u.com/
73, Jim KQ6EA
--- Jonny 290 jonny290@gmail.com wrote:
I had good luck with Schedule 40 and a broomstick, as well. Run the broomstick through the PVC and bolt it twice on each end such that each end has two bolts running through it in a 'cross' configuration.
It's not as light as fiberglass but the rigidity is great for my 2x8element array 25 feet off the ground.
On Fri, Apr 4, 2008 at 12:49 PM, Curt Nixon cptcurt@flash.net wrote:
Pretty simple to make a fiber pole functional
equal.
use a pc of schedule 40 PVC pipe. apply a couple
of wraps of 5 oz glass
cloth using epoxy or polyester resin. The glass
will prevent the PVC
from sagging and adds great strength.
FWIW
KU8L Curt
K7WIN - Jeff wrote:
Hi Bob,
I ordered the fiberglass M2 boom from RANDL.com,
item HDFGBOOMKIT
(http://www.rlham.com/cgi-bin/shop/modellookup.dbw?MODEL=HDFGBOOMKIT);
however, is a bit pricey at $184.95 plus
shipping. I have read where
other
homemade methods have been used with success.
Are you going to use both azimuth and elevation
rotors or just azimuth?
73, Jeff - K7WIN
----- Original Message ----- From: w0dxz@aol.com To: amsat-bb@amsat.org Sent: Friday, April 04, 2008 7:36 AM Subject: [amsat-bb] cross boom?
In putting together my antenna,?? (144-432)I
need something to use as a
horizontal- cross? support boom. What would be
the best length, and,?
what
would be the minimum length,,,? would 6? ft
separation be OK?? To
minimize
problems, should I mount one beam horizontal,
one vertical? Does it
matter
which one, is? which way?
I doubt I can find a fiberglas boom locally,,,?
what else could I use??
or, where can I order a fiberglas boom?
thanks Bob W0DXZ _______________________________________________ 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
You were not clear on whether they are circular or linear. If they are linear mount them both vertical and use steel tubing. If they are circular you can still use steel tubing, just be careful where on the boom you attach it.
It's and age old debate :-)
http://www.g6lvb.com/fibermetalboom.htm
73, Joe kk0sd
-----Original Message----- From: amsat-bb-bounces@amsat.org [mailto:amsat-bb-bounces@amsat.org] On Behalf Of w0dxz@aol.com Sent: Friday, April 04, 2008 9:36 AM To: amsat-bb@amsat.org Subject: [amsat-bb] cross boom?
In putting together my antenna,?? (144-432)I need something to use as a horizontal- cross? support boom. What would be the best length, and,? what would be the minimum length,,,? would 6? ft separation be OK?? To minimize problems, should I mount one beam horizontal, one vertical? Does it matter which one, is? which way?
I doubt I can find a fiberglas boom locally,,,? what else could I use?? or, where can I order a fiberglas boom?
thanks Bob W0DXZ _______________________________________________ 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 used schedule 80 PVC with a large wooden dowel pushed inside for added rigidity. I sealed each end with epoxy. It's been going strong for a couple of years now. I saw your other post about antennas. At present I'm using a four element 2 meter beam and an 11 element 70cm beam in vertical polarization. Both are homebrewed using Ken Britain's "cheap yagi" design. 73, Michael, W4HIJ ----- Original Message ----- From: w0dxz@aol.com To: amsat-bb@amsat.org Sent: Friday, April 04, 2008 10:36 AM Subject: [amsat-bb] cross boom?
In putting together my antenna,?? (144-432)I need something to use as a horizontal- cross? support boom. What would be the best length, and,? what would be the minimum length,,,? would 6? ft separation be OK?? To minimize problems, should I mount one beam horizontal, one vertical? Does it matter which one, is? which way?
I doubt I can find a fiberglas boom locally,,,? what else could I use?? or, where can I order a fiberglas boom?
thanks Bob W0DXZ _______________________________________________ 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
-- No virus found in this incoming message. Checked by AVG. Version: 7.5.519 / Virus Database: 269.22.6/1360 - Release Date: 4/4/2008 6:02 PM
If you are using linearly polarized yagis, just mount each vertical and separate horizontally about 5-6 feet using an aluminum crossboom. There is no need for non-metallic boom if the crossboom is perpendicular to the plane of polarization. Ideally, the separation would be so that the field of neither antenna were to touch, but practical separation of the field of the higher frequency antenna is sufficient. If you get cross-talk between VHF and UHF it may be and advantage to have one antenna place in the opposite polarization. Then mount each on a 45-degree slant -----/
I use two x-yagis mounte on metallic crossboom. The antennas are mounted in an X----X configuration and both are RHCP with no problem of cross-talk using up to 50w. Preamps are used with both antennas so either mode-UV or VU may be used. My crossboom is about 6-foot long and both antennas have about 18-foot booms.
73 Ed - KL7UW http://www.kl7uw.com/sat.htm for pictures
At 06:38 PM 4/4/2008, Michael A. Tondee wrote:
I used schedule 80 PVC with a large wooden dowel pushed inside for added rigidity. I sealed each end with epoxy. It's been going strong for a couple of years now. I saw your other post about antennas. At present I'm using a four element 2 meter beam and an 11 element 70cm beam in vertical polarization. Both are homebrewed using Ken Britain's "cheap yagi" design. 73, Michael, W4HIJ ----- Original Message ----- From: w0dxz@aol.com To: amsat-bb@amsat.org Sent: Friday, April 04, 2008 10:36 AM Subject: [amsat-bb] cross boom?
In putting together my antenna,?? (144-432)I need something to use as a horizontal- cross? support boom. What would be the best length, and,? what would be the minimum length,,,? would 6? ft separation be OK?? To minimize problems, should I mount one beam horizontal, one vertical? Does it matter which one, is? which way?
I doubt I can find a fiberglas boom locally,,,? what else could I use?? or, where can I order a fiberglas boom?
thanks Bob W0DXZ _______________________________________________ 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
-- No virus found in this incoming message. Checked by AVG. Version: 7.5.519 / Virus Database: 269.22.6/1360 - Release Date: 4/4/2008 6:02 PM
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 went with the choice of a non metallic crossboom because originally I had planned to build CP antennas and thought it would be the best option. As it turned out, I decided against CP antennas at present because I didn't have the measuring equipment to properly determine the velocity factor of the coax used in the phasing harneses. I probably will eventually construct CP antennas, I even have a second set of aluminum rod elements for the 70 cm antenna,but I just decided to simplify things to start with. 73, Michael, W4HIJ ----- Original Message ----- From: "Edward Cole" kl7uw@acsalaska.net To: "Michael A. Tondee" mat_62@netcommander.com; amsat-bb@AMSAT.Org Sent: Saturday, April 05, 2008 12:50 AM Subject: Re: [amsat-bb] Re: cross boom?
If you are using linearly polarized yagis, just mount each vertical and separate horizontally about 5-6 feet using an aluminum crossboom. There is no need for non-metallic boom if the crossboom is perpendicular to the plane of polarization. Ideally, the separation would be so that the field of neither antenna were to touch, but practical separation of the field of the higher frequency antenna is sufficient. If you get cross-talk between VHF and UHF it may be and advantage to have one antenna place in the opposite polarization. Then mount each on a 45-degree slant -----/
I use two x-yagis mounte on metallic crossboom. The antennas are mounted in an X----X configuration and both are RHCP with no problem of cross-talk using up to 50w. Preamps are used with both antennas so either mode-UV or VU may be used. My crossboom is about 6-foot long and both antennas have about 18-foot booms.
73 Ed - KL7UW http://www.kl7uw.com/sat.htm for pictures
At 06:38 PM 4/4/2008, Michael A. Tondee wrote:
I used schedule 80 PVC with a large wooden dowel pushed inside for added rigidity. I sealed each end with epoxy. It's been going strong for a couple of years now. I saw your other post about antennas. At present I'm using a four element 2 meter beam and an 11 element 70cm beam in vertical polarization. Both are homebrewed using Ken Britain's "cheap yagi" design. 73, Michael, W4HIJ
participants (8)
-
Curt Nixon -
Edward Cole -
Gary "Joe" Mayfield -
Jim Jerzycke -
Jonny 290 -
K7WIN - Jeff -
Michael A. Tondee -
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