November 2007 - AMSAT-BB - mailman.amsat.org

Re: Quadrifilar Helices
by Jeff Hite 02 Nov '07

02 Nov '07

> ------------------------------ > > Message: 5 > Date: Fri, 02 Nov 2007 10:33:09 -0700 > From: Dave Guimont <dguimon1(a)san.rr.com> > Subject: [amsat-bb] Re: Quadrifilar Helices > To: "R.Haighton" <ve3frh(a)cogeco.ca> > Cc: amsat-bb(a)amsat.org > Message-ID: <200711021733.lA2HX9s4008456(a)ms-smtp-03.socal.rr.com> > Content-Type: text/plain; charset="iso-8859-1"; format=flowed > > >> The Satellite Experimenters Handbook by Martin Davidoff K2UBC (1990 Pages >> 8-15 & 16) and it's successor The Radio Amateur's Satellite Handbook (1998 >> pages 10-13 to 10-15) both have details of this antenna, its use and its >> construction. >> I recommend this book to all satellite experimenters and users, it may be >> nearly 10 years old but the principles and information contained therein >> have not changed. >> >> Robin Haighton VE3FRH >> Immediate Past President AMSAT >> > > That's exactly where I started, Robin, on page 6-20 of the original edition. > But Maxwell's measurement produced a horrible > VSWR.....I saw Marty later on at a convention, > and I believe he said the same thing happened to him... > > It took me 4 iterations to get the antenna flat > with no matching device...I of course did it at > 435. But those dimensions translated very > successfully to 2M satellite, 2M repeaters, and > believe it or not to 2.4 gigs....In front of a dish, of course!!! > > I had seen other pictures of the antenna, and was > very interested prior to Marty's excellent > depiction of the construction details... > > I used a combination of 435 and 2M versions fixed > at about 45?, and rotated in AZ only and worked > very well with strong signal birds... > > Quadfilxxxxxxxxx has the dimensions for the 3, > but the 2.4 gig computation is left as an exercise for those interested. > > http://home.san.rr.com/doguimont/uploads/ > > Nice to hear from you, Robin....R U active on any of the birds?? > > > > > 73, Dave wb6llo(a)amsat.org > Disagree: I learn.... > > Pulling for P3E... > > > > I found WB6LLO's 435 version easy to reproduce with good results. -- Jeff KK7WR

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Re: New to this
by John Marranca, Jr 02 Nov '07

02 Nov '07

NR5A: Welcome. My Lord, our stories sound IDENTICAL. I was a Mode K/RS jockey myself. And I, too, sold my 2-meter FM gear years ago because of the junk that was going on locally. I also use an FT-817ND for...well...everything, really... ...as well as having 2 eggbeaters. And, with the gear I have, I'm having a blast. You shouldn't have any difficulty. either. I have the AO-51 and AO-27 AOS frequencies stored as a memory...but I manually tune the main VFO to chase the Doppler. Works out very well. I keep one of the VFOs on 145.825 for APRS via satellite. Finally, my HOME frequency is 144.390 for terrestrial APRS. Other than the birth of my kids, my wedding day, and the start of my career, the NEXT best day was the day my FT-817ND came. (Almost 20 years on HF doing the same-old same-old started getting boring....) Good Luck, my friend, and we'll listen for you on the birds. 73 de KB2HSH -- _______________________________ John Marranca, Jr PBX Technician/Shop Steward CWA Local 1122 BN Systems, Inc Orchard Park, NY (716)972-2006

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Re: Mobile Satellite Month
by John Marranca, Jr 02 Nov '07

02 Nov '07

QUOTE: >* 145.825 ANDE-1 (re-entry expected next month) *That will be sad, indeed...as I've enjoyed using it for the short amount of time I've been interested in the hamsats. John KB2HSH* * -- _______________________________ John Marranca, Jr PBX Technician/Shop Steward CWA Local 1122 BN Systems, Inc Orchard Park, NY (716)972-2006

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Re: New to this!
by Clint Bradford 02 Nov '07

02 Nov '07

> >>...mostly my FT-817 or I can go FT-857D if I get the urge... You can easily work AO-51 and SO-50 with your '817! Page 45 of the 817ND manual shows you how to program "split frequencies." Here's a quick tutorial on working AO-51 and SO-50 for you: http://homepage.mac.com/clintbradford/Menu3.html Clint Bradford, K6LCS AMSAT Area Coordinator

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My email
by Robert McGwier 02 Nov '07

02 Nov '07

If you attempted to send email to my AMSAT email alias in the past two weeks, it likely bounced. I recently changed providers from comcast to verizon and I was just certain I had moved all of my email accounts. I think I did, except for one, possibly the most important. Thanks to all who pointed it out. Bob -- AMSAT Director and VP Engineering. Member: ARRL, AMSAT-DL, TAPR, Packrats, NJQRP, QRP ARCI, QCWA, FRC. ARRL SDR WG Chair “An optimist may see a light where there is none, but why must the pessimist always run to blow it out?” Descartes

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Doppler compensation??
by Dave Guimont 02 Nov '07

02 Nov '07

Can someone explain this "new" thing about the difficulty in compensating for doppler? I used to do it with one hand on a knob, or with one of the many programs available. Has something changed?? 73, Dave wb6llo(a)amsat.org Disagree: I learn.... Pulling for P3E...

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WRC-07 - ERO report on first week
by Trevor 02 Nov '07

02 Nov '07

WRC-07 - ERO report on first week http://www.southgatearc.org/news/november2007/wrc07_first_week.htm 73 Trevor M5AKA --------------- Daily Amateur Radio RSS News: http://www.southgatearc.org/ Email your news items to: editor at southgatearc.org News On Your Website: http://www.southgatearc.org/rss/index.htm News On Your PC: http://www.southgatearc.org/rss/newsreader.htm Upload Your News: http://www.southgatearc.org/news/your_news.htm --------------- ___________________________________________________________ Want ideas for reducing your carbon footprint? Visit Yahoo! For Good http://uk.promotions.yahoo.com/forgood/environment.html

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New to this!
by nr5a 02 Nov '07

02 Nov '07

I use to work the RS birds and just loved it, now of course there is nothing like that. I swore I"d never do the FM birds cause I don't even do the FM Repeaters. I've lived near Rapid City, SD for 21 years and can count the number of times I've been on the reapeaters here on one hand. Sorry they just don't do anything for me. I've broke down and decieded I want to get on the FM birds. The radio will be mostly my FT-817 or I can go FT-857D if I get the urge. I see antennas like the Arrows where 2 beams are on the same boom, is there a real advantage to this?? My antenna will be mounted outdoors and I'm going in the direction of 2 antennas on a cross boom. I'm not that interested in parading around in a parking lot carring a antenna and looking silly. How much antenna do I really need? I have tried listening on the FT-817's rubber duck antenna with no results. I thru together a hastly built one element egg beater type. (a site to see, held together by duct tape.) The other nite I almost heard AO-51. My next step is tearing off the eggbeater and duct taping a 3 el yagi to the yardstick. I want to see the difference and maybe learn something while playing. I'll go now cause I'm probably wasiting your time thanks for reading this. Jerry - NR5A - South Dakota

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Rohn 45G stuff needed
by Stargate 02 Nov '07

02 Nov '07

OK, Last call before I order new. (I hate to do that:-) I'm looking for the following..... BPL45G Rohn 45G Flat top bearing plate Rohn TB3 bearing 45G house bracket AS455G Rotor shelf It doesn't need to be Rohn. Equivalent Nello, or other makers will be considered as well. Thanks, RoD KD0XX A good friend will come and bail you out of jail, A TRUE friend will be sitting next to you saying..... "DAMN THAT WAS FUN"

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I'm Here!
by Greg KJ6KO 01 Nov '07

01 Nov '07

Hi Guys! Thought I'd join the list just in case you had any questions. I think everyone is getting tired of forwarding email to me. Anyway, I can keep you updated on the amplifier progress and keep in touch easier this way. 73 de Greg KJ6KO www.kj6ko.com

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