[AMSAT-BB] Re: Feeding M2 Eggbeaters

14 Jan 2021

      Along the same lines as Zach's board, there is another KI0AG implementation
from KW4FB that uses 1206 and 1008 components, slightly larger than the
0805 ones used on Zach's board. I built one of these (boards also available
on OSH Park) as my first SMD project, and it turned out to be rather easier
than I'd anticipated. This one is designed for use without connectors on
the board. And yes, good for 10W.
http://kw4fb.com/micro-diplexer/
Martin.
KD6YAM
On Thu, Jan 14, 2021 at 7:47 AM Leffke, Zachary zleffke@vt.edu wrote:
...
Hi Folks,
Not sure if it helps, but it’s certainly related.  A while back I did a
simple EagleCAD layout for a microdiplexer (very similar to the diplexer
that comes with the Arrow, based on the KI0AG design) that uses 0805
surface mount components.  Cost for 3 boards from Osh Park is around $5.00
(not counting the caps/inductors and connectors that would be needed,
listed in the BOM).
https://github.com/zleffke/micro_diplexer
There are two variants in the repo, one for edge launch SMA connectors,
one for through hole SMA connectors (or coax pigtails if desired).  If
memory serves, with the components in the BOM, the board can handle roughly
10W of RF or so on TX (though at the time when I built them, my project was
RX only….so I haven’t actually tested the TX RF power handling
capability).  There is also a QUCS simulation in the repo if that’s of
interest for folks.
-Zach, KJ4QLP
--
Research Associate
Aerospace & Ocean Systems Lab
Ted & Karyn Hume Center for National Security & Technology
Virginia Polytechnic Institute & State University
Work Phone: 540-231-4174
Cell Phone: 540-808-6305
*From:* KENT BRITAIN wa5vjb@flash.net
*Sent:* Thursday, January 14, 2021 10:18 AM
*To:* amsat-bb@amsat.org; Fred Hillhouse fmhillhouse@comcast.net
*Subject:* [AMSAT-BB] Re: Feeding M2 Eggbeaters
Hi Fred:
All depends on the voltage breakdown rating of the 4.7 and 10 pf caps.
Something like Silver Mica's with 100+ voltage ratings should be good to
100 watts or so.
Some 1000 volt doorknobs, close to a KW.
Regarding your breakdown version.   One backpacker made his out of soft
wire.  He kind of wands it up and stuffs it in his backpack.   When he gets
to his hilltop, he 'unwads' the antenna and straightens out of elements.
 Says they are good for about a half dozen waddings, then he makes a new
one.
73 Kent WA5VJB
On Thursday, January 14, 2021, 09:07:02 AM CST, Fred Hillhouse <
fmhillhouse@comcast.net> wrote:
Hi Kent,
How much power would you expect the design in the PDF to handle?
Note: This is not to imply I am using high power into a satellite.
I made a “break-down” version of the Cheap-LEO. It still needs some
refinements, such as shedding weight.
Thank you!
Fred N7FMH
*From:* KENT BRITAIN [mailto:wa5vjb@flash.net wa5vjb@flash.net]
*Sent:* Thursday, January 14, 2021 2:29 AM
*To:* amsat-bb@amsat.org; Mike Lucas
*Subject:* [AMSAT-BB] Re: Feeding M2 Eggbeaters
How are his construction skills?   Here is the diagram for an easy to
build 145-435 MHz
splitter/diplexer.
http://www.wa5vjb.com/references/Cheap%20Antennas-LEOs.pdf
Can be built as shown, or in a metal box with connectors.
It would even be possible to locate the diplexer near the antenna, then he
would only
have one long coax run.    73 Kent WA5VJB
On Thursday, January 14, 2021, 01:11:11 AM CST, KENT BRITAIN <
wa5vjb@flash.net> wrote:
Several companies make a VHF/UHF Diplexer.   The 145/435 MHz signals are
split in filters.
Kent WA5VJB
On Thursday, January 14, 2021, 01:02:21 AM CST, Mike Lucas <
documike@comcast.net> wrote:
Friend of mine just got a M2 Eggbeater SatPack 1setup for VHF/UHF.
His rig covers both bands however only has a PL259 output so he’s
wondering how to feed those antennas with one feedline up to the boom. Is
there an RF switched coax relay box or something else that will maybe
work?  I’ve always had radios with 2 RF coax outputs on the radio, then run
2 lines up to the tower & each antenna.
I told him I’d post on here to see what feedback I got.
Thanks
Mike N7ASZ

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[AMSAT-BB] Re: Feeding M2 Eggbeaters

Martin Cooper