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

Sun May 5 00:45:39 UTC 2019

>>> 4.21 DEGREES RX with EggBeater <<<

W0ARP-15 got this one at 4.21 degrees elevation about 23 hours ago. Pretty
amazing performance from an EBB144 w/Pre-Amp. Bruninga confirms the pSat
power is fairly low at 0.25 watts.

https://twitter.com/MachaleRobert/status/1124836474807930880

Also, you can monitor these pSat angles on:
http://www.spaceCommunicator.club/igates/

N6DAN-1 = EBB144 w/pre-amp
W0ARP-15 = EBB 144 w/pre-amp

73s

Robert
KE6BLR

On Sat, May 4, 2019 at 3:30 PM Robert Bruninga <bruninga at usna.edu> wrote:

> 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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>