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CX2SA > SATDIG 25.11.20 21:00l 618 Lines 20826 Bytes #999 (0) @ WW
BID : AMSATBB15442
Read: GUEST
Subj: AMSAT-BB-digest V15 442
Path: IW8PGT<HB9ON<IW2OHX<IR1UAW<IQ5KG<IK1NHL<CX2SA
Sent: 201125/1712Z @:CX2SA.SAL.URY.SOAM #:44190 [Salto] FBB7.00e $:AMSATBB15442
From: CX2SA@CX2SA.SAL.URY.SOAM
To : SATDIG@WW
Today's Topics:
1. Re: Fiberglass Cross-boom Alternative? (Bill Booth)
2. Rocket Lab Launches (Wendy and Terry Osborne)
3. Re: Fiberglass Cross-boom Alternative? (MICHAEL WILLIAMS)
4. Re: Fiberglass Cross-boom Alternative? (Gary)
5. Re: Fiberglass Cross-boom Alternative? (Tony)
6. Wanted: Kenwood TM-710GA (Tony)
7. Re: Fiberglass Cross-boom Alternative? (Hasan N0AN)
8. Re: Fiberglass Cross-boom Alternative? (kb2mjeff@???.????
9. Re: Fiberglass Cross-boom Alternative? (Jean Marc Momple)
10. Re: Fiberglass Cross-boom Alternative? (Jean Marc Momple)
11. Re: Fiberglass Cross-boom Alternative? (Bob Hammond)
12. Silent key (John Hale)
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Message: 1
Date: Tue, 24 Nov 2020 20:16:34 -0500
From: Bill Booth <ve3nxk@?????.???>
To: amsat-bb@?????.???
Subject: Re: [amsat-bb] Fiberglass Cross-boom Alternative?
Message-ID: <f22583d5-9ccd-4391-d344-0db77137cf84@?????.???>
Content-Type: text/plain; charset=utf-8; format=flowed
On 2020-11-24 7:00 p.m., Tony via AMSAT-BB wrote:
> alternative to fiberglass cross booms?
I took a length of electrical PVC conduit 1.5 inch and put a wooden dowel
inside
it. It was a tight fit but I ground some off to make it slide in with a bit
of
force (hammer). The dowel was coated with a light 50/50 alcohol/shalac
rubbed on
with a cloth. It is still in use after maybe 20 years.
I am not 100% sure about the wooden dowel. I may have use something smaller
than
the inside of the PVC and only drove in a piece at each end that was tight.
It
was wood though.
--
Bill Booth VE3NXK
Sundridge ON, Canada
79.23.37 W x 45.46.18 N
FN05ns
Visit my weather WebCam at http://www.almaguin.com/wxcurrent/weather.html
Organ and Tissue Donation - The Gift of Life
Talk to your family. Your decision can make a difference.
------------------------------
Message: 2
Date: Wed, 25 Nov 2020 14:47:15 +1300
From: Wendy and Terry Osborne <wandtosborne@?????.???>
To: "amsat-bb@?????.???? <amsat-bb@?????.???>
Subject: [amsat-bb] Rocket Lab Launches
Message-ID: <a28085de-20fb-e8f4-9305-50114350f47c@?????.???>
Content-Type: text/plain; charset=utf-8; format=flowed
The last Rocket Lab launch raised $286,092 for Starship Children's Hospital.
See: https://twitter.com/captainstarship/status/1330972678807760901
The next launch is 12 December UTC.
See: https://twitter.com/RocketLab/status/1331319876590346240
The details are here: https://www.rocketlabusa.com/missions/next-mission/
It will be a night launch 11:09 PM NZDT.
They will be streaming it from here:
https://www.rocketlabusa.com/live-stream
73,
Terry Osborne ZL2BAC
------------------------------
Message: 3
Date: Tue, 24 Nov 2020 21:24:41 -0500 (EST)
From: MICHAEL WILLIAMS <k9qho67622@???????.???>
To: "amsat-bb@?????.???? <amsat-bb@?????.???>
Subject: Re: [amsat-bb] Fiberglass Cross-boom Alternative?
Message-ID: <99093736.33390.1606271081363@???????.???????.???>
Content-Type: text/plain; charset=UTF-8
My first cross boom was a clothes closet rod from Home Depot or Lowes.
Being very strong, it was a good substitute.
It supported a 14 element KLM for 2 meters on one end and a 11 turn helix
(70cm) on the other.
I gave it a coat of paint and used it for many years.
GL, Mike, K9QHO
------------------------------
Message: 4
Date: Wed, 25 Nov 2020 03:03:30 +0000
From: Gary <gary_mayfield@???????.???>
To: Tony <73guddx@?????.???>, "AMSAT-BB@?????.????
<AMSAT-BB@?????.???>
Subject: Re: [amsat-bb] Fiberglass Cross-boom Alternative?
Message-ID:
<CH2PR13MB3864EE5E6E6460749EF79AE58AFA0@?????????????.????????.????.???????.??
?>
Content-Type: text/plain; charset="us-ascii"
Don't dismiss using a metal cross-boom. People say it won't work without
actually examining the problem. When antenna guru Kent Britain, WA5VJB
looked at the problem he found a metal boom to work quite well. He then
tested it on the antenna range and verified it worked. You can see the
paper he presented at an AMSAT symposium here:
http://www.kk0sd.net/metalboom/metalboom.htm
When I had a permanent satellite station I used a metal cross-boom, and
there were several others in the OSCAR-13 and AO-40 era that did.
73,
Gary "Joe", kk0sd
-----Original Message-----
From: AMSAT-BB <amsat-bb-bounces@?????.???> On Behalf Of Tony via AMSAT-BB
Sent: Tuesday, November 24, 2020 6:00 PM
To: AMSAT-BB <amsat-bb@?????.???>
Subject: [amsat-bb] Fiberglass Cross-boom Alternative?
All:
Is there a cheaper non-metallic alternative to fiberglass cross booms?
Or maybe a wholesale fiberglass rod distributor that has such a beast at a
reasonable price?
Tony -K2MO
_______________________________________________
Sent via AMSAT-BB@?????.???. 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: https://www.amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 5
Date: Tue, 24 Nov 2020 23:49:08 -0500
From: Tony <73guddx@?????.???>
To: AMSAT-BB <amsat-bb@?????.???>
Subject: Re: [amsat-bb] Fiberglass Cross-boom Alternative?
Message-ID: <c675c15d-1fd2-9d34-7fec-04789ab24278@?????.???>
Content-Type: text/plain; charset=utf-8; format=flowed
All:
Thanks for all the useful info on cross boom alternatives.
Tony -K2MO
------------------------------
Message: 6
Date: Tue, 24 Nov 2020 23:52:44 -0500
From: Tony <73guddx@?????.???>
To: AMSAT-BB <amsat-bb@?????.???>
Subject: [amsat-bb] Wanted: Kenwood TM-710GA
Message-ID: <208550b3-d1ad-1df0-ab84-0d8cadf1daec@?????.???>
Content-Type: text/plain; charset=utf-8; format=flowed
All:
I'm looking for a used Kenwood TM-710GA in good condition - preferably a
shack unit that has not been installed in a mobile.
Please contact me direct.
Tony -K2MO
------------------------------
Message: 7
Date: Wed, 25 Nov 2020 04:50:30 -0600
From: Hasan N0AN <hbasri.schiers6@?????.???>
To: Tony <73guddx@?????.???>
Cc: AMSAT-BB <amsat-bb@?????.???>
Subject: Re: [amsat-bb] Fiberglass Cross-boom Alternative?
Message-ID:
<CAM4UQf3syb7WirqeqvZ79Vkti3wOUsccVEF0+qN2X9xmQcsR_A@????.?????.???>
Content-Type: text/plain; charset="UTF-8"
I have tested the VJB paper in the real world on a metal cross boom (after
having used fiberglass for years), and it worked just fine if you follow
his instructions precisely. I used a 70cm M2 circularly polarized antenna
(boom length about 10' or so, can't recall the model number)
73, N0AN
Hasan
On Tue, Nov 24, 2020 at 10:50 PM Tony via AMSAT-BB <amsat-bb@?????.???>
wrote:
> All:
>
> Thanks for all the useful info on cross boom alternatives.
>
> Tony -K2MO
>
> _______________________________________________
> Sent via AMSAT-BB@?????.???. 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: https://www.amsat.org/mailman/listinfo/amsat-bb
>
------------------------------
Message: 8
Date: Wed, 25 Nov 2020 07:06:31 -0500
From: <kb2mjeff@???.???>
To: <amsat-bb@?????.???>
Subject: Re: [amsat-bb] Fiberglass Cross-boom Alternative?
Message-ID: <02ad01d6c323$6a5bc880$3f135980$@???.???>
Content-Type: text/plain; charset="utf-8"
I second what Joe is saying. Years ago I had also put up a Fiberglas cross
boom, this was before I read Kent's report ?. If you do put up a Fiberglas
boom be prepared every 5 years or so to remove the antennas and recoat the
boom with fresh gelcoat. Over time, and I guess depending on their size ,
the antennas will move around on the boom chewing it up.
Now I have rotor controlled sat stations at two different locations. These
are downsized from what I used to have. Both stations have aluminum cross
booms that the manufacturer supplied with the sat antenna systems made by
Cushcraft, and M2. Only thing I think is necessary is when you mount the
antennas don't line up the elements with the cross boom, position them 45
degrees off, and as far apart as possible to limit crosstalk...
73 Jeff kb2m
-----Original Message-----
From: AMSAT-BB <amsat-bb-bounces@?????.???> On Behalf Of Gary via AMSAT-BB
Sent: Tuesday, November 24, 2020 10:04 PM
To: Tony <73guddx@?????.???>; AMSAT-BB@?????.???
Subject: Re: [amsat-bb] Fiberglass Cross-boom Alternative?
Don't dismiss using a metal cross-boom. People say it won't work without
actually examining the problem. When antenna guru Kent Britain, WA5VJB
looked at the problem he found a metal boom to work quite well. He then
tested it on the antenna range and verified it worked. You can see the
paper he presented at an AMSAT symposium here:
<http://www.kk0sd.net/metalboom/metalboom.htm>
http://www.kk0sd.net/metalboom/metalboom.htm
When I had a permanent satellite station I used a metal cross-boom, and
there were several others in the OSCAR-13 and AO-40 era that did.
73,
Gary "Joe", kk0sd
-----Original Message-----
From: AMSAT-BB < <mailto:amsat-bb-bounces@?????.???>
amsat-bb-bounces@?????.???> On Behalf Of Tony via AMSAT-BB
Sent: Tuesday, November 24, 2020 6:00 PM
To: AMSAT-BB < <mailto:amsat-bb@?????.???> amsat-bb@?????.???>
Subject: [amsat-bb] Fiberglass Cross-boom Alternative?
All:
Is there a cheaper non-metallic alternative to fiberglass cross booms?
Or maybe a wholesale fiberglass rod distributor that has such a beast at a
reasonable price?
Tony -K2MO
_______________________________________________
Sent via <mailto:AMSAT-BB@?????.???> AMSAT-BB@?????.???. 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: <https://www.amsat.org/mailman/listinfo/amsat-bb>
https://www.amsat.org/mailman/listinfo/amsat-bb
_______________________________________________
Sent via <mailto:AMSAT-BB@?????.???> AMSAT-BB@?????.???. 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: <https://www.amsat.org/mailman/listinfo/amsat-bb>
https://www.amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 9
Date: Wed, 25 Nov 2020 19:56:10 +0400
From: Jean Marc Momple <jean.marc.momple@?????.???>
To: "Joseph B. Fitzgerald" <jfitzgerald@????.???.???>
Cc: Patrice Mompl? <patricemomple@?????.???>, AMSAT-BB
<amsat-bb@?????.???>
Subject: Re: [amsat-bb] Fiberglass Cross-boom Alternative?
Message-ID: <CD25294B-64B6-4FE2-A500-6210C9FE11A8@?????.???>
Content-Type: text/plain; charset=utf-8
Tony,
This side fiberglass tube for booms not available and importing same quite
expensive.
You may do it yourself for a fraction of the commercial cost using PVC
(non-pressure) tube as a mould and using glass 2/4 coats of fiberglass matt
300grm/m2 for strength and for finishing surface matt and plenty of resin or
epoxy. sanding between the coats will be required to get it good looking
I made one to support a long VHF LF cross Yagi about 7m long and another OM
here Patrice (3B8FA) for HF Quad boom and spreader (fiberglass over bambous
former).
However working fiberglass may repel some as ?dirty? work and particularly
when sanding it as the powder may get you scratching yourself for the night,
just use some vaseline over you exposed body part to avoid same.
Hope this helps.
73
Jean Marc
> On Nov 25, 2020, at 4:49 AM, Joseph B. Fitzgerald via AMSAT-BB
<amsat-bb@?????.???> wrote:
>
> Max Gain Systems might work for you as a fiberglass wholesaler, depending
on your definition of "reasonable price".
>
> https://mgs4u.com/?fiberglass
>
> de KM1P Joe
>
> ________________________________________
> From: AMSAT-BB <amsat-bb-bounces@?????.???> on behalf of Tony via AMSAT-BB
<amsat-bb@?????.???>
> Sent: Tuesday, November 24, 2020 7:00 PM
> To: AMSAT-BB
> Subject: [amsat-bb] Fiberglass Cross-boom Alternative?
>
> All:
>
> Is there a cheaper non-metallic alternative to fiberglass cross booms?
> Or maybe a wholesale fiberglass rod distributor that has such a beast at
> a reasonable price?
>
> Tony -K2MO
>
> _______________________________________________
> Sent via AMSAT-BB@?????.???. 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: https://www.amsat.org/mailman/listinfo/amsat-bb
> _______________________________________________
> Sent via AMSAT-BB@?????.???. 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: https://www.amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 10
Date: Wed, 25 Nov 2020 20:43:02 +0400
From: Jean Marc Momple <jean.marc.momple@?????.???>
To: Gary <gary_mayfield@???????.???>
Cc: "AMSAT-BB@?????.???? <AMSAT-BB@?????.???>
Subject: Re: [amsat-bb] Fiberglass Cross-boom Alternative?
Message-ID: <E6347166-AD82-4BD3-A942-778D48CF155E@?????.???>
Content-Type: text/plain; charset=utf-8
Gary,
Yes, many of us believe that having a metaling cross boom, boom or clamps
has no significant effect on your Yagi, actually for most purposes I fully
agree it is generally not noticeable.
Being a purist, I wish to state that theoretically any metal part within the
antenna except the active element, including boom, clamps etc... affect the
antenna theoretical performance. This is why I am presently building a UHF 4
x 30 ele. cross pol LFA Yagis array and a VHF 22 ele. cross pol VHF yagi.
These antennas will have no metal parts except the active elements and the
purpose is to be prepared or the future Lunar and eventually Mars repeaters,
but also for own experimentation. All this not really require fo LEO?s anyway.
For info: when I started to study the LFA?s which is actually a superb
concept and I already build a few to test same, with success using
fiberglass booms. Originally when I contacted the supposed ?inventor? which
is inviting the OM?s to contact him for help on his Web site, it was
frustrating as unfortunately he was too busy ?making a living? thus did not
help at all. Actually a blessing in disguise as thus I reversed engineered
his design using the appropriate softwares and found many flaws in his
claims (probably driven by commercial consideration), such as the metal boom
having no effect, element support, worse his proposal for cross pol Yagis
totally wrong conceptually, etc? In a nutshell the theoretical conclusion is
that having no metal part in the LFA design will make a even better antenna
that the ?inventor? claims particularly for space com and low signal or in
noisy QTH. The acid test will be done in a few months when all this will be
on the roof here.
I already suggested a way to do cheap fiberglass booms and forgot to say
that paint roller extension is also a cheap way to make fiberglass booms,
just ensure that you have aluminium tube on the parts where you will clamps
same secure some epoxy glue so that clamps do not crush it.
73
Jean Marc (3B8DU)
> On Nov 25, 2020, at 7:03 AM, Gary via AMSAT-BB <amsat-bb@?????.???> wrote:
>
> Don't dismiss using a metal cross-boom. People say it won't work without
actually examining the problem. When antenna guru Kent Britain, WA5VJB
looked at the problem he found a metal boom to work quite well. He then
tested it on the antenna range and verified it worked. You can see the
paper he presented at an AMSAT symposium here:
> http://www.kk0sd.net/metalboom/metalboom.htm
>
> When I had a permanent satellite station I used a metal cross-boom, and
there were several others in the OSCAR-13 and AO-40 era that did.
>
> 73,
> Gary "Joe", kk0sd
>
> -----Original Message-----
> From: AMSAT-BB <amsat-bb-bounces@?????.???> On Behalf Of Tony via AMSAT-BB
> Sent: Tuesday, November 24, 2020 6:00 PM
> To: AMSAT-BB <amsat-bb@?????.???>
> Subject: [amsat-bb] Fiberglass Cross-boom Alternative?
>
> All:
>
> Is there a cheaper non-metallic alternative to fiberglass cross booms?
> Or maybe a wholesale fiberglass rod distributor that has such a beast at a
reasonable price?
>
> Tony -K2MO
>
> _______________________________________________
> Sent via AMSAT-BB@?????.???. 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: https://www.amsat.org/mailman/listinfo/amsat-bb
> _______________________________________________
> Sent via AMSAT-BB@?????.???. 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: https://www.amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 11
Date: Wed, 25 Nov 2020 08:56:18 -0800
From: Bob Hammond <propgrinder@?????.???>
To: amsat-bb@?????.???
Subject: Re: [amsat-bb] Fiberglass Cross-boom Alternative?
Message-ID:
<CAKoB7Op4GWdwqo3Sqt1XWGYtfAZH8MobEY9aC-zVDrxOZtn1AQ@????.?????.???>
Content-Type: text/plain; charset="UTF-8"
I got my 1/25" diameter solid fiberglass boom from www.MGS4U.com at what I
think was a reasonable price. I painted it white to protect the finish and
it's working quite well. I have three sat antennas on it: 70cm and 23cm
on one side of the rotor and a 2m on the opposite side. To aid in clamping
the antennas and the EL rotor to the boom, I cut appropriately-sized
sections of PVC pipe to place at those clamping points. I then applied
self-adhesive non-skid tread to the boom, attached the PVC sections over
the non-skid tread, slid the fiberglass boom into the EL rotor, and
attached the antennas. Seems to be working just fine.
On Tue, Nov 24, 2020 at 4:01 PM Tony via AMSAT-BB <amsat-bb@?????.???>
wrote:
> All:
>
> Is there a cheaper non-metallic alternative to fiberglass cross booms?
> Or maybe a wholesale fiberglass rod distributor that has such a beast at
> a reasonable price?
>
> Tony -K2MO
>
> _______________________________________________
> Sent via AMSAT-BB@?????.???. 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: https://www.amsat.org/mailman/listinfo/amsat-bb
>
------------------------------
Message: 12
Date: Wed, 25 Nov 2020 17:02:23 +0000
From: John Hale <M0DJH@???????.???>
To: "amsat-bb@?????.???? <amsat-bb@?????.???>
Subject: [amsat-bb] Silent key
Message-ID:
<AM4PR08MB269061B078D7B8DF9D202200E7FA0@?????????????.????????.????.???????.??
?>
Content-Type: text/plain; charset="us-ascii"
Dear Sirs
Please could you arrange to cancel all emails being sent to the address
above i.e m0djh@???????.???<????????????@???????.???>.
My husband is now a silent key and I have been unable to do so.
Thankyou
Hilary Hale
------------------------------
Subject: Digest Footer
_______________________________________________
Sent via amsat-bb@?????.???.
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 member? Join now to support the amateur satellite program!
https://www.amsat.org/mailman/listinfo/amsat-bb
------------------------------
End of AMSAT-BB Digest, Vol 15, Issue 442
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