Echoes of Apollo EME 2010, April 16,17,18 aka World Moon Bounce
approaching fast. Like last year, we would like it to be all EME
all bands, and modes, a fun event, with a common Science outreach
People thread. We are still open to event design inputs as to
QSO exchanges, etc.
This year, EOA has been graced with a special opportunity; We have
Arecibo Dish on board, for 432 SSB, and CW; Maybe 1296.
For Planning purposes, Arecibo can only steer +-20 degrees from
and is located at:
We are working with the very kind, generous and capable Arecibo
and Staff, and the Arecibo Observatory Amateur Radio Club, on
setting up a
1296 station, which we have to source, design, fabricate and test,
If anyone is interested in joining the Arecibo DX-pedition team,
a 1296 transportable station, please contact me off line.
) The EOA team will/can stay on site, at the $60/day (way below
rates) accomodations for the Visiting Scientist Staff.
The 1296 station will be located inside the Gregorian Feed Dome
feed horn, will illuminate their dual mirror Gregorian feed, and
1000' spherical dish, 450 ft below. Yesterday we encountered a
one of space, to mount a planned OM6AA design Dual Mode Feed. We
have much space behind the phase center, to mount the feed, and
the OM6AA feed will fit. We may only have 18" (still checking)
phase center point for the feed. We are still testing and
checking, but I
(an EME newbie) would welcome suggestions for feeds that are
short, that will more likely fit inside the Gregorian Dome on the
floor, at Arecibo. I am still gathering exact required F/D
We are planning a pre EOA event test of the Arecibo 432 system,
and date not determined, but probably Feb 24 or 25 from about 0:00
01:30 UTC (evenings of the local 23rd and 24th, Arecibo time).
short, and not aimed at QSOs, in the interest of minimizing
and dish clock time. I will know later if/how many two way QSO
opportunties exist for this test. Principal objective of the test,
see what is required in terms of a minimum station receiver
preamps to hear either CW or SSB.
We would like any 432 EME stations to listen, perhaps even record,
received, and send reception reports in, noting their receiver
Arecibo has more than 50 dbi gain perhaps much more, on 432 (still
an exact figure) so if it can be heard with modest equipment, I
encourage Hams to connect with schools, set up a 432 receive
bring the kids to your EME station) ,and demonstrate EME to the
We are also looking for a documentarian, to video the Arecibo
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A meeting with NASA at NASA-Ames yesterday bore fruit as earlier
predicted, with an opportunity for collaboration between NASA and
and possible regular EME operations from Arecibo in the future.
mentioned, that whether this happens, now turns on a critical EME
test that will happen in March, date as yet undetermined.
The test, which we had hoped to do earlier this week, had to be
due to operational issues at the Arecibo. NASA and Arecibo would
well organized test done, and, based on the results, will make a
of a level of support and interest for future Arecibo EME/Science
/ Fun projects. As many as several per year.
What Arecibo, and NASA want, is to
get quality data from as many sources
as possible during the test, and a well thought out, standardized
data collection, and submission for analysis, that includes
details of the
reception, (a digital audio file recording would be great) listing
obviously, time, date, frequency, Make and model, serial number,
item used at the receive location, Receiver, Preamp, if any,Coax,
station layout used, Antenna type, make, model, Signal strength
objective, (precision, if possible) and subjective, and any notes
the antenna was pointed, whether hand held, or some auto track
(software used) A careful record of actual Az and El vs time,
Operator name, location and contact information, and a subjective
by the operator after the test. Photographs, or video of each
actually used, or in operation, showing key components, Antenna,
interconnects, relays, Receiver preamps used, etc.
It is my guess that with all the highly skilled, and dedicated EME
owner operators out here, there are many who have developed their
careful note books and forms for documenting their station
it is constantly improved. If there are any who have developed a
station configuration and performance report form that is suitable
groomed into a standardized report form for this Arecibo event, we
love to see it, and perhaps use it for the event.
Arecibo and NASA would like to
bracket the gamut of stations used, from
the least sophisticated, to the most sophisticated. [Maybe not]
Surprisingly, with particular interest in unsophisticated,
stations. NASA and Arecibo really want to see proof that easy to
out of common materials, (welding rod, copper wire, Grape stake or
lath (1x 2s, etc) booms, Stanley Tape elements, etc, antennas that
that are buildable by a, say, middle school age child, under adult
supervison, and ideally, who has a mentor who can work with the
showing/teaching/explaining how to use software to determine the
dimensions and spacing of Yagi Elemnts, driven loops, etc. I think
element Quagi on a variety of lengths of wooden boom would be a
target home brew antenna, especially if you could A/B compare and
that antenna's performance against a (any) commerical, or more
conventional antenna of known characteristics used. I could see a
Science Fair entry coming for someone out of this exercise.
Post test, Data forms need to be
in for review by NASA/Arecibo, at a to-be supplied address.
All of these operations, and test at Arecibo are being conducted
conformance with operational guidelines, governing operations at
and US Part 97 FCC regulation.
The frequency suggested for use is 432.045,
subject to change and
confirmed prior to the test. Modes will be SSB, and CW.
Arecibo will use a 432 station lineup provided by the local
Obervatory Amateur Radio Club, capable of providing 60 watts, or
feed. The Arecibo Antenna Gain is about 58 dbi at 432. (!) If
loan a higher power PA to the test effort, it would be welcomed.
now of the essence, for setup prior to the test later in March.
A complete operational, tested, backup 432 EME station, if it
found, and made available at Arecibo, both for the test, and the
April 16,17,18 would be a good idea, and if needed, could be
hand carried, accompanied by the owner-operator who would be the
support component of it's operation at Arecibo. As mentioned
organized sked should be made for the EME event, particularly due
very short (2.5 hour max per day) Arecibo operational windows to
We are looking for volunteers for a team to organize skeds.
73, de Pat Barthelow AA6EG
Od: Edward Cole
Datum: 27.2. 2010, 21:15
Couple comments (inserted): Please inform the eme community with
a lead-time as possible for those stations that must install
equipment (and just general planning).
I'm sure they would like to get data that is comparable (to a
format), and accurate. In fact JT-65 provides this more easily
but takes up more time. Perhaps a one-way beacon using JT-65 for
ten-minute test period would allow a lot of stations to record the
with a variety of equipment and antennas. JT-65 produces a
level measurement and is capable of producing .wav files of
A data base of participating stations could be built and analyzed
VK3UM's sw. That should provide a comparable performance document.
My preliminary eme path-link analysis indicates that you will need
than 60w at Arecibo for the small home-built antenna/receivers to
successful (especially for SSB). My guess is that a 7-10 element
(12-dBi gain) would require use of JT-65 for reception of a 60w
transmitter at Arecibo (60w is 14 dB weaker than 1500w; 60w SSB
SNR= -5.4 dB, 60w CW= +1.4 dB). Therefore, obtaining a high power
very important. I will run my eme path-loss sw to give you an idea
ground station requirements for receiving Arecibo with a zero SNR
different modes. SSB typically needs SNR= +6 dB, CW SNR> -12
dB, JT-65 SNR
> -28 dB (those are my guesstimates).
73, Ed - KL7UW, WD2XSH/45
Od: Patrick Barthelow
Předmět: [Moon-net] EOA, Quagi Antenna Construction Tips,
Datum: 2.3. 2010, 08:42 - dnes v 08:42
Assuming the coming pre EOA event (Event: April 16,17,18, pre
sometime in March) test goes well, there will probably be a series
Arecibo moon bounce events organized, in coordination with
thrice yearly, as part of a NASA-Arecibo Ham Radio-EME outreach
and a series of articles covering them, probably in CQ-VHF. "Goes
terminology is critical for success, and is defined as a
of a small, simple to build 432 Yagi, or Quagi antenna(s) that
successfully receive audio (SSB) trasmissions from the moon.
meetings with NASA and discussions with Arecibo have empasized the
for very careful, scientific rigor in building and documenting the
operational performance of the Quagi antenna of various boom
are used for the test. If simple antennas are proven to work
(helped by 58
dbi gain and a KW at the feed) then work begins on arranging
EME events at Arecibo, with among other things, science outreach
opportunities as the goal.
UHF Quagis, and Quads, have been designed and built in the past,
commonly available materials, 12 guage solid house wire, welding
(aluminum, or Brass 1/16") and wood 1" x 2" lath. Perhaps Stanley
Carpenters steel tape fills, (can be bought at a hardware store,
not modeled, so someone needs to model the tape elements, (flat
etc) for a Quagi. Should not take more than about 4 hours to build
these, once you pick up the materials from the hardware store.
Well known antenna and Contester Icon, Wayne Oberbeck, N6NB
wrote the book, and landmark articles on Quagis, see below, for
detailed Quagi construction information and tips.
Build some... some as described, some with fewer elements, some
elements and longer booms. follow the prescribed dimensions, and
design tips in Wayne's article carefully. I need for the pre-event
test, a number of these kinds of antennas with different boom
evaluate a minimum required design for EME success.
The Arecibo test is later this month, at a to be determined time,
declination of the moon is high, favoring good Arecibo windows.
the test event, there will be built Quagi antennas of various boom
lengths, and careful measurements made, on the complete stations
results obtained. I anticipate a Quagi with a boom length of about
will be more than required to hear the Bounced 432 SSB signals. We
like to confirm if a much less lengthy boom will also perform
adequately... So, get your materials, this article attached, and
73, de Pat Barthelow AA6EG
Od: Patrick Barthelow <email@example.com>
Komu: firstname.lastname@example.org , email@example.com
Předmět: Re: [Moon-net] Anyone having Experience with Freescale MRF6VP41KH
Datum: 11.3. 2010, 13:57
Dear John, and EME Friends,
A timely question, indeed. I am working with Freescale now, and expect
delivery, soon on a 600W output 432 amp, perhaps the first in the field,
for ham radio use. It is in Europe now, at Freescale Semi getting final
detailed adjustments, and bench burn-in testing.
The amp design has been in operational development, for a couple of years
now, and the development engineer says he has extremely high reliability,
with the single KW device package (two FETs).
I anticipate final 432 SSPA checkout, test, and shipment shortly.
We plan to use this at Arecibo. 5 W in, will deliver ~600 W out with high
safety margin, in amateur service. 10:1 SWR withstand capability. Engineer
says that is conservative, and with a proper heatsink, (including water
cooling) says 1KW output is mathematically possible. He says this one that
we are taking to Arecibo at 600W out is operating very safely, and
conservatively at that power level.
A single active device package, 50V switching supply, air cooled heat
sink, 5W in 600W out in a small light package. The amp, we are taking to
Arecibo, will come with a spare MRF6VP41KH device, which can be changed in
the field, with only a screw driver, and some heat sink paste, no
soldering/desoldering necessary. I am truly astonished.
We think a complete 600W output Amp AND switching 50V Power supply can be
packaged < 10kg. I may want to get into building these, for ham use, here
in California. Stay tuned...
73, de Pat Barthelow AA6EG firstname.lastname@example.org
Od: Patrick Barthelow <email@example.com>
70cm, from Arecibo Possibly Tomorrow
Datum: 18.3. 2010, 20:41
Angel at Arecibo is preparing for an operational test at Arecibo, maybe
even as soon as tomorrow, Friday. He and others in the Arecibo Radio Club
have moved quickly on assembling a station, approx 500 watts, and will
position closely to feed, to minimize coax losses.
He has not confirmed the frequency or a mode, or call sign used but it may
be the club Call sign, KP4AO. A frequency that I earlier suggested was
432.045. I will update as soon as I know additional details.
This test is the one I want to get detailed reports on. Please take
careful notes, of your setup and signal strengths received.
I'm sure you already reported that, but I wonder what mininimum elevation
is needed at Arecibo to see the moon (mainly I guess by tilting/lifting
the feed as the reflector is a fixed one) ? 70°, 80°, more ? This would
help to compute maximum mutual window at any location, the vk3um planner
is doing this nicely.
Dear Jean-Marc, and Friends,
Arecibo [FK68OI] can steer its beam a maximum of 20 degrees from local vertical,
local zenith angle. That would be entered in VK3UM planner as Minimum
elevation of 70 degrees. Check me on this, but I ran that for today and
find that Arecibo's maximum window in time today, March 19, is from 18:00Z
through 20:40Z. I had planned a number of areas of study, and equipment to
ship and place at Arecibo, such as SDR receivers, High power Amps and
detailed test operations, so as to get a reasonably precise figure of
received signal strength with a variety of antennas.
I had also planned to open up the SWL (schools, radio clubs, and Satellite
ops) population to listening in with simple antennas, especially with high
power at the feed of Arecibo, and ~ 58 dbi of gain. Thanks to Ed, KL7UW
for working with me to run numbers and using exprience to come up with a
minimum antenna/performance required for hearing Arecibo SSB off the moon,
assuming 500 watts at Arecibo Feed. For SSB, it looks like a long boom 20
element, or possibly 2 booms at 13 elements are going to be required.
(Thanks a ton, (or rather about 5 kg) to Lionel, F1JRD, of Freescale
Semiconductor, for his custom designed, single device, 5 in - 600 out
Special thanks go to Russ Pillsbury K2TXB who offered to do some event and
QSO scheduling, and to bring an SDR receiver, during the event at the
Remember, this event is only one of the EOA EME/WMBD events (and other EME
(DUBUS)events that weekend. I encourage all to work whatever you can EME
on any band, and have confirmed Dwingeloo participation, and HB9MOON, and
I am guessing some of the guys from Australia, VK3UM, et al, will
participate. Consider that EOA aspects are not limited to 70cm operation.
If you have an idea on how to make a distinctive QSO marker, or content to
the EOA activity, I am interested in hearing suggestions. Perhaps EOA
folks can create at special certificate of participation, or QSL for the
event, for mailing to EME stations or even SWL stations that confirm a
recipt of a QSO.
After Arecibo, I plan to make the Freescale Semi amp ( a backup amp this
time at Arecibo) an EME community "Rover" amp, available to EME
expeditioners, or special ops on 70cm needing QRO. It is an amazingly
capable piece of QRO, lightweight, small, and even capable of higher
power. If.. you can design a water cooled heatsink for the single package
active device. (MRF6VP41KH) I think the whole amp/Switching power supply
package comes in under 10kg, havent seen it yet, it is being prepared for
shipment from France. As soon as I know scheduling of any tests from
Arecibo, I will post.