Schedule 40 & schedule 80 are simply different wall thicknesses for pressure ratings. I believe the gray PVC is intended for electrical conduit purposes, and it is more resistant to UV, but the color has nothing to do with the schedule grade.
The white stuff can tend to get brittle out in the sun. Painting it will help with this somewhat. My 70cm antenna was modeled after the cheap yagi design and had a white PVC boom that had been painted gray. When lowering the mast to do some rotator maintenance the antenna brushed a nearby dogwood tree that the XYL refuses to let me cut down. The boom snapped right at one of the elements. This could have been brittleness or just the fact of where it struck. I can't comment on the tan (CPVC) pipe as I haven't used it. My replacement antenna will be using schedule 80 which is gray in color and much more rigid for the boom. 73, Michael, W4HIJ
Message: 7 Date: Tue, 15 Aug 2006 18:56:47 -0700 From: James Cottle jim_cott@earthlink.net Subject: [amsat-bb] Any 9600 orbital sources up? To: amsat bb amsat-bb@amsat.org Message-ID: 44E27B5F.9080702@earthlink.net Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Hello there, I am having some difficulty. Are there any amateurs consistently receiving 9600 beacons or TLM from either POSAT, ECHO or TECHSAT? It has been some time since I heard anything from these. Thanks. Jim N6FO San Francisco
Message: 8 Date: Tue, 15 Aug 2006 21:20:22 -0700 From: "Zachary Schrempp" zach.km7i@gmail.com Subject: [amsat-bb] Some rare Washington grids To: amsat-bb amsat-bb@amsat.org Message-ID: eab046d0608152120y48e042c8nd19b2e1f4e837e82@mail.gmail.com Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Hey guys,
I am going over to CN77 on Thursday and Friday. I'll see if I can get into CN76, which is one of those grids where just a sliver of it skims the coast. Maybe CN86 too. I'll take the Arrow and run on AO-51 and SO-50.
73, Zach
-- Zachary Schrempp, KM7I Age 15 AMSAT #36023
Message: 9 Date: Tue, 15 Aug 2006 20:33:27 -0700 From: "kc6uqh" kc6uqh@cox.net Subject: [amsat-bb] Re: Cheap LEO antennas To: "Michael Tondee" mat_62@netcommander.com, "Joe Kononchik" kononchik@sbcglobal.net Cc: amsat-bb@amsat.org Message-ID: 000801c6c0e4$bcabf3e0$72b7b546@kc6uqh Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=original
Mike,
From an electrical point yes, but mechanical strength is poor especilly in
warm weather.
Art, KC6UQH ----- Original Message ----- From: "Michael Tondee" mat_62@netcommander.com To: "Joe Kononchik" kononchik@sbcglobal.net Cc: amsat-bb@amsat.org Sent: Tuesday, August 15, 2006 7:01 PM Subject: [amsat-bb] Re: Cheap LEO antennas
Joe Kononchik wrote:
Does anyone know if PVC (Schedule 40) can be used as a substitute for wood? _______________________________________________ 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! http://amsat.org/mailman/listinfo/amsat-bb
The white stuff can tend to get brittle out in the sun. Painting it will help with this somewhat. My 70cm antenna was modeled after the cheap yagi design and had a white PVC boom that had been painted gray. When lowering the mast to do some rotator maintenance the antenna brushed a nearby dogwood tree that the XYL refuses to let me cut down. The boom snapped right at one of the elements. This could have been brittleness or just the fact of where it struck. I can't comment on the tan (CPVC) pipe as I haven't used it. My replacement antenna will be using schedule 80 which is gray in color and much more rigid for the boom. 73, Michael, W4HIJ _______________________________________________ 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
Message: 10 Date: Tue, 15 Aug 2006 21:21:31 -0700 From: Emily Clarke emily@planetemily.com Subject: [amsat-bb] ISS Commander Bill McArthur is AMSAT's Keynote Speaker To: amsat-bb@amsat.org Message-ID: 7.0.1.0.2.20060815211951.05575a50@planetemily.com Content-Type: text/plain; charset="us-ascii"; format=flowed
ISS Commander McArthur to Keynote at AMSAT Symposium
AMSAT is excited to announce that ISS Expedition 12 Commander William (Bill) S. McArthur, KC5ACR, will be the keynote speaker at the 2006 AMSAT Space Symposium to be held at the Crowne Plaza Hotel in Foster City, California, October 6-8, 2006. Commander McArthur is well known to ham radio operators - during his six months aboard the ISS he became the most active radio amateur ever to serve in space. Commander McArthur logged more than 1800 QSOs, and earned the ARRL Worked All States Award. His impressive track record also included a record 37 school contacts, Worked All Continents (including Antartica) and 130 DXCC entities.
Astronaut McArthur is a veteran of four space flights that include: * STS-58 - October 1993 (Spacelab Life Sciences Mission 2) * STS-74 - November 1995 (Shuttle-Mir Docking Missing 2) * STS-92 - October 2000 (ISS Assembly Mission 3A) * Expedition 12 - October 2005 In addition Bill has made four spacewalks (two each aboard STS-92 and Expedition 12) and was on backup crews of Expeditions 8, 9 and 10. He will be featured during the Annual Banquet on Saturday evening, October 7, 2006.
The 2006 Space Symposium will be a joint meeting with the ARISS International Delegates and will also include the IARU Satellite Advisory Panel annual meeting, and a meeting of AMSAT International Delegates. For additional information please visit the AMSAT website at http://www.amsat.org. Click on the 2006 Space Symposium link in the left side menu.
This year you can register for the Space Symposium online. Online Registration can be found at http://www.amsat-na.com/symposium
73,
Emily Clarke, N1DID Symposium Chair
Sent via amsat-bb@amsat.org. Opinions expressed are those of the author. Not an AMSAT member? Join now to support the amateur satellite program! http://amsat.org/mailman/listinfo/amsat-bb
End of AMSAT-BB Digest, Vol 1, Issue 1
Thanks, Robin Midgett K4IDC 615-322-5836 office - rolls to pager 615-835-7699 pager 615-301-1642 home K4IDC@comcast.net http://www.people.vanderbilt.edu/~robin.midgett/index.htm
Sorry, I didn't mean to indicate that all schedule 80 PVC was gray in color, I was just refering to what I have on hand that I got at the local home improvement center. I do know that the pipe I have is definitely intended as plumbing pipe and not electrical conduit. I got it because of it's superior rigidity to shcedule 40. Obviously this is the case because it is thicker walled tubing. 73, Michael
Robin Midgett wrote:
Schedule 40 & schedule 80 are simply different wall thicknesses for pressure ratings. I believe the gray PVC is intended for electrical conduit purposes, and it is more resistant to UV, but the color has nothing to do with the schedule grade.
The white stuff can tend to get brittle out in the sun. Painting it will help with this somewhat. My 70cm antenna was modeled after the cheap yagi design and had a white PVC boom that had been painted gray. When lowering the mast to do some rotator maintenance the antenna brushed a nearby dogwood tree that the XYL refuses to let me cut down. The boom snapped right at one of the elements. This could have been brittleness or just the fact of where it struck. I can't comment on the tan (CPVC) pipe as I haven't used it. My replacement antenna will be using schedule 80 which is gray in color and much more rigid for the boom. 73, Michael, W4HIJ
participants (2)
-
Michael Tondee -
Robin Midgett