Oops. Jeff Moore noticed my typo: Tony's call is AA2TX. I left out the T before.
On Mon, Jan 6, 2014 at 9:32 AM, Burns Fisher <bu...@fisher.cc> wrote: > Ben, > > Have you looked at the AA2X Lindenblads? Tony has designed both a 70cm > Lindenblad (with a single dipole driven element and parasitic elements for > the rest) and a 2m Lindenblad (with phasing using lengths of 75ohm (yes, > 75!) coax. I'm not terribly skilled at building stuff, but I was able to > build the 70cm version, and I am just starting the 2m version. Not > terribly hard and using easily-available materials. The only somewhat > specialized items are ferrites, cable, and connectors. Most of the rest > you can get at your local hardware store. > > The Lindenblads have a nice pattern too: highest gain toward the horizon > somewhat less overhead (where the bird is closest). > > 73, > > Burns W2BFJ > > > On Mon, Jan 6, 2014 at 2:21 AM, Ben Gelb <b...@gelbnet.com> wrote: > >> Hi Jens - >> >> I bought 3 of the antennas.us QFH antennas a few years ago. >> >> - 1 70cm QFH (passive) >> - 1 70cm QFH w/ preamp >> - 1 2m QFH (passive) >> >> I live in an apartment and have limited space for big antennas, so I >> thought these would be a good fit. They're very compact, and easy to set >> up >> on my flat roof. >> >> Over the couple of years I used them, I made some QSOs on FO-29 and others >> (I don't have 70cm TX, so primarily used 70cm for receive only). Worked >> OK, >> but found that I needed pretty high elevation passes to have success. >> >> I think the QFH throws most of the energy straight up (broad pattern, but >> not a lot at the low elevation angles). >> >> Then, the 2m antenna turned into an open... turned out to be a broken >> solder joint inside of the antenna (not easy to get at it to fix, >> either... >> needed a hacksaw, as the antenna is sealed in a plastic tube). >> Then, the preamp in the 70cm ant stopped working. Haven't bothered trying >> to fix. >> >> Lately, I switched to a small 6-el "cheap yagi" (WA5VJB design) for 70cm >> receive, mounted on a motorized pan/tilt for security cameras... SO MUCH >> better (and not a "long" yagi by any means either). So there is definitely >> a compromise going to the omni-type ants. >> >> If i'd continued down the fixed/omni path, I think I would have liked to >> try a simple 1/4 vertical as a baseline - my hunch is it may have >> performed >> at least as well as the QFH, since there would be better coverage of the >> lower elevations (where the sat is farther away). The "Lindenblad" looked >> interesting too, but complicated to make yourself. >> >> 73, >> Ben >> >> >> >> On Tue, Dec 24, 2013 at 3:45 AM, Jens Spiess <jens.spi...@bluewin.ch> >> wrote: >> >> > Hi all , >> > >> > I would like to work the LEO-satellites after a stop of my >> amsat-activities >> > since 12 years now again . >> > But I have changed my QTH in the Swiss-Alps and the weather is at a lot >> > of times of the year very roughly . (A lot of snow, ice and storms ...) >> > >> > So , I want NOT use long YAGI-Antennas with rotators again – ... or so >> on >> > ..- >> > because all was always and always – also the rotator – demaged . >> > So I am interested to use – maybe – only fixed antennas for 2m/70cm like >> > the >> > edgbeater from M2 or the other like this (I found it in the internet ) : >> > >> > >> > >> http://www.antennas.us/store/p/229-UC-4364-328-UHF-Amateur-Satellite-Antenna.html >> > >> > BUY BOTH as KIT : >> > ================= >> > UC-AMSAT-KITP, 2 m / 70 cm Passive Amateur Satellite Antenna Kit >> > Item #: UC-AMSAT-KITP-VHFL-UHFR-N-VHF-10ft-UHF-10ft >> > Availability: approx. 2 weeks >> > Usually ships In approx. 2 weeks >> > Price: $250.00 >> > >> > But they will always use with low-noise 20 dB-gain-Preamplifieres >> installed >> > on the top of my house directly after the antennas . >> > >> > Can anybody tell me , which antenna-types will get the best results as >> > fixed-mounted ones or have anybody experiences or maked a compare >> > between these antennas ...? >> > >> > Like this : >> > >> > >> http://www.antennas.us/store/p/229-UC-4364-328-UHF-Amateur-Satellite-Antenna.html??? >> > or these : >> > http://www.m2inc.com/pdf_manuals/EB-144%20_%20RK2M.pdf ??? >> > >> > Which of them will be better work for LEO-communication ...?? >> > >> > 73 de Jens / HB9JOI >> > >> > _______________________________________________ >> > 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
