[amsat-bb] ARRL Antenna book, eggbeater antenna designs

Sat May 4 22:29:55 UTC 2019

Psat is one of the weakest satellites up there.  It is only 0.25W AND that
is FM packet.  So when you compare that to a 0.1W linear downlink, which is
on al the time, the average power of PSAT is only 0.025w.  But it was the
only transmitter we had at the time.  PSAT2 will be 1.5W or about 8 dB
stronger.

Bob, Wb4APR

On Sat, May 4, 2019 at 6:11 PM KE6BLR Robert via AMSAT-BB <
amsat-bb at amsat.org> wrote:

> I'll add the TX/RX angles for the ISS so we can compare those too.
>
> 73s
>
> Robert
> KE6BLR
>
>
> On Sat, May 4, 2019 at 1:11 PM John Brier <johnbrier at gmail.com> wrote:
>
> > Forgive me, I see those are PSAT packets. Dunno what its power is.
> >
> > 73, John Brier KG4AKV
> >
> > On Sat, May 4, 2019, 16:09 John Brier <johnbrier at gmail.com> wrote:
> >
> >> Not disputing the utility of egg beaters, but fwiw the ISS is the most
> >> powerful ham transponder we have. The Ericsson is speced at 4 or 5
> watts.
> >>
> >> 73, John Brier KG4AKV
> >>
> >> On Sat, May 4, 2019, 16:02 KE6BLR Robert via AMSAT-BB <
> amsat-bb at amsat.org>
> >> wrote:
> >>
> >>> >>> 7 DEGREES RX via EggBeater <<<
> >>>
> >>> N6DAN-1 gets APRS packets on 145.825 MHz as low as 7 degrees via the
> >>> EBB144.
> >>>
> >>> See Tweet of report:
> >>> https://twitter.com/MachaleRobert/status/1124763800865873920
> >>>
> >>> I asked him to leave the EBB on the N6DAN-1 iGate for the entire month
> of
> >>> May to get performance metrics. He also has a directional antenna for
> >>> N6DAN-2.
> >>>
> >>> For the pSat, you can monitor the TX and RX angles here:
> >>>
> >>> http://www.spaceCommunicator.club/igates/
> >>>
> >>> 73s
> >>>
> >>> Robert
> >>>
> >>>
> >>> On Fri, May 3, 2019 at 4:03 PM Bob Liddy (K8BL) via AMSAT-BB <
> >>> amsat-bb at amsat.org> wrote:
> >>>
> >>> >  I got a good chuckle out of KG5CCI's link to the MFJ Dummy
> >>> >   Loads.
> >>> > Quite a few years back, I picked up a pair of the M2 Eggbeaters at a
> >>> > Hamfest for $150. I put them up with some 9913 and found that they
> were
> >>> > very close to being Dummy Loads in the sky. That was probably why the
> >>> guy
> >>> > was selling them so cheap. They were sold again a couple years ago at
> >>> > Dayton for the same price. Lesson learned.
> >>> > I always thought the concept was very good, but the results were very
> >>> > disappointing. That was before the excellent performing SATs we have
> up
> >>> > there now. Maybe they would have moderate success now, but I wouldn't
> >>> get
> >>> > my hopes up.
> >>> > My suggestion would be to get/build a couple small Yagis and put them
> >>> on a
> >>> > mast several feet apart with the 70cm above and the 2M below with one
> >>> > vertical and one horizontal polarized. Tilt them up 15-20 degrees
> and a
> >>> > cheap TV Rotor is all you need. The tilting can  be done by
> fashioning
> >>> a
> >>> > mast-to-boom plate drilled for the desired  angle for each antenna.
> >>> Or, you
> >>> > could merely bend the mast that small  amount. This should give you
> >>> > reasonable success until you decide you  have the experience to get
> >>> more
> >>> > sophisticated and will not have spent  a bunch of money initially.
> >>> > GL/73,     Bob  K8BL        (AMSAT #6593 since 1979)
> >>> >
> >>> >     On Friday, May 3, 2019, 5:00:48 PM EDT, David Swanson via
> AMSAT-BB
> >>> <
> >>> > amsat-bb at amsat.org> wrote:
> >>> >
> >>> >  Hi Sean!
> >>> >
> >>> > I don't recall seeing any name calling here until your post, I
> >>> genuinely
> >>> > want to make sure the author of this thread who has sent numerous
> >>> emails to
> >>> > this list explaining how to operate gets the best tips in regards to
> >>> their
> >>> > planned build. I'm actually in the process of building the setup I
> >>> > recommended and will plan on doing a demo for folks sometime here
> soon,
> >>> > stay tuned!
> >>> >
> >>> > -Dave, KG5CCI
> >>> >
> >>> > On Fri, May 3, 2019 at 3:51 PM Sean Waite <waisean at gmail.com> wrote:
> >>> >
> >>> > > Ah, yes, rather than maybe educate someone let's just berate them
> and
> >>> > > functionally call them an idiot.
> >>> > >
> >>> > > Eggbeaters have a bad rap because they don't necessarily hear well.
> >>> You
> >>> > > may be making it into the bird but not hearing yourself, so you
> keep
> >>> > tuning
> >>> > > around and calling trying to find yourself only to be deaf-ly
> QRMing
> >>> > other
> >>> > > stations. I have no experience with them, but that's what I've
> heard.
> >>> > >
> >>> > > 73,
> >>> > > Sean WA1TE
> >>> > >
> >>> > > On Fri, May 3, 2019 at 4:49 PM David Swanson via AMSAT-BB <
> >>> > > amsat-bb at amsat.org> wrote:
> >>> > >
> >>> > >> Instead of building eggbeaters, pick up a few of these:
> >>> > >>
> >>> > >> http://www.mfjenterprises.com/Product.php?productid=MFJ-261
> >>> > >>
> >>> > >> You'll also need a pair of these:
> >>> > >>
> >>> > >>
> >>> https://www.amazon.com/Coaxial-Cable-Female-SO239-PL259/dp/B00KQHH7VC
> >>> > >>
> >>> > >> Hook those into your baofengs and you'll be just as effective on
> the
> >>> > >> Satellites as you would with some homemade 'beaters.
> >>> > >>
> >>> > >> Good luck! 73!
> >>> > >>
> >>> > >> -Dave, KG5CCI
> >>> > >>
> >>> > >> On Fri, May 3, 2019 at 3:19 PM Devin L. Ganger via AMSAT-BB <
> >>> > >> amsat-bb at amsat.org> wrote:
> >>> > >>
> >>> > >> > Greetings, programs!
> >>> > >> >
> >>> > >> > I'm looking to work with my son (who will be studying to get his
> >>> > >> > Technician license later this month) on building a UHF/VHF pair
> of
> >>> > >> > eggbeater antennas. I've found a few papers online, but does
> >>> anyone
> >>> > >> have a
> >>> > >> > good reference to a detailed design?
> >>> > >> >
> >>> > >> > Does the ARRL Antenna book latest edition have any significant
> >>> > coverage
> >>> > >> of
> >>> > >> > eggbeaters at all? I have an older version that has nothing.
> >>> > >> >
> >>> > >> > Also, most of the designs I see are for a single band. If you're
> >>> > >> deploying
> >>> > >> > a pair for satellite operations, do you simply attach them
> >>> through a
> >>> > >> > duplexer? I have a Diamond MX-72N that I picked up a while ago
> for
> >>> > using
> >>> > >> > with dual Baofengs, but it's been sitting in my drawer since I
> >>> picked
> >>> > >> up my
> >>> > >> > TH-D72A. It has a 1.6~150MHz lead and a 350~460MHz lead.
> >>> > >> >
> >>> > >> > Thanks in advance for any pointers you might have.
> >>> > >> >
> >>> > >> >
> >>> > >> > --
> >>> > >> > Devin L. Ganger (WA7DLG)
> >>> > >> > email: devin at thecabal.org<mailto:devin at thecabal.org>
> >>> > >> > web: Devin on Earth<http://www.devinonearth.com/>
> >>> > >> > cell: +1 425.239.2575
> >>> > >> >
> >>> > >> > _______________________________________________
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> >>> > >> > expressed
> >>> > >> > are solely those of the author, and do not reflect the official
> >>> views
> >>> > of
> >>> > >> > AMSAT-NA.
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> >>> views of
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> >>> > >
> >>> > _______________________________________________
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> available
> >>> > to all interested persons worldwide without requiring membership.
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> >>> > expressed
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> >>> of
> >>> > AMSAT-NA.
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> >>> > _______________________________________________
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> available
> >>> > to all interested persons worldwide without requiring membership.
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> >>> > expressed
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> >>> of
> >>> > AMSAT-NA.
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> >>> _______________________________________________
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> >>> to all interested persons worldwide without requiring membership.
> >>> Opinions expressed
> >>> are solely those of the author, and do not reflect the official views
> of
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> >>
> _______________________________________________
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> to all interested persons worldwide without requiring membership. Opinions
> expressed
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