[amsat-bb] Re: LEO-satellites-antennas... ?

Burns Fisher burns at fisher.cc
Mon Jan 6 06:34:30 PST 2014


I should also say that I have an M2 Eggbeater for 2m which I am pretty
happy with.  I can pick up AO73 very easily when it is only a few degrees
above the horizon, and that  will generally be thorough a lot of trees.

73,

Burns W2BFJ


On Mon, Jan 6, 2014 at 2:21 AM, Ben Gelb <ben at 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.spiess at 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
> >
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