I have been playing with a new Triquint ULNA device (TQP3M9036). It
Shows a lot of promise. It is like a MAR or MSA device in that it is
50ohm in and out. and has a claimed NF about .4db nf ( their numbers).
I have built several pramps to test them and have gotten even better
than they claim and they cover 50-1296 with ease and NF is .4ish or
below. The S11 and S22 are both great and the OIP3 is +35db also
...very nice device. It has great promise as a good terrestrial LNA.
Preamps are foolproof to build and would cost under $50 if all the best
quality parts are used.
Just for information only ...
Pete WA2ODO
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Sri I made, at least a mistake, I send it again.
Hi all,
Very interesting answers. I come from Sats world, where the Doppler
is a serious issue and it is so quick that it is impossible to work
JT65.
I will speak thinking in one carrier. Sats need to receive in only
one fix frequency (it is an active RX with a wideband), if the Sat
receives a carrier in this frequency then it will be repeated. The
signal TX from the Sat will be in one fix frequency. So people who
work Sats must correct its TX frequency (according with actual
Doppler) to reach the sat in its fix frequency, in the same way
because of the Sats will repeat this signal in a fix frequency, people
must correct its RX frequency (according with actual Doppler).
This way of dealing with Doppler is very interesting because NOBODY
KNOWS the Doppler of the other stations and nobody needs to know it,
we only need to know our own Doppler.
If we would use this agreement to EME communications we will always
speak about the frequency we hit the Moon, in other words the
frequency which the Moon hear us and repeat our signal.
The actual EME software shows us the Doppler as the sum of the Doppler
effects to reach the Moon and to receive the bounce signal, so Moon
will receive us at ½ Doppler announced, the other ½ effect will appear
after de bounce.
I will try to set a couple of examples.
1.- We will agree to hit the Moon in 1296.070. This is the frequency I
will announce in the log. In our software the dates will be:
*Self Doppler
+3KHz
*DX Doppler
-2KHz
The sign that the software shows will aplly to RX frequency and the
opposite to the TX frequency, and always ½ magnitude on each one.
Both of us must deal with Doppler, each one must do their task to hit
the moon in the agreed frequency and to receive the bounce according
our Doppler. Then we must set on our transceivers:
*Me
TX: 1296.070 -1.5KHz = 1296.0685MHz
RX: 1296.070 +1.5KHz= 1296.0715MHz
*DX
TX: 1296.070 +1.0KHz = 1299.071MHz
RX: 1296.070 -1.0KHz= 1296.069MHz
Each station who sees the post will act only according its own
Doppler. Don´t mind where is the DX station.
2.- In this case I see a signal in my receiver in 1296.070. What
kind of pair of frequencies I must set (I know nothing about the DX
station I have still decode nothing), I only know me own Doppler, and
it is +2KHz. I must hit the moon in the same frequency that my
partner:
TX: 1296.070 -1.0KHz = 1296.069MHz
RX: 1296.070 = 1296.070MHz
WE WILL NOT NEED TO KNOW NO MORE THAN OUR DATES.
I haven´t spoken about what frequencies will be the echoes (both
echoes), to make the understanding easy.
As a drawback we should change our habits, we should always use the
RIT as follow:
TX: The frequency we choose plus the opposite sign of Doppler and ½
Doppler magnitude.
RIT: the sign of our Doppler and ½ Doppler magnitude.
Although at first glance it seems not to be interesting in 144MHz but
we will always hit the target in whatever band, even in 144MHz.
Somebody can tell that they need a computer, to do JT65 of course, if
you do CW surely have a smart phone with the proper software to know
your own Doppler or you can print it before.
If I made some mistakes let me know.
It is my 2 cents.
Juan Antonio
EA4CYQ
Hi Lunatic!!
i heve :
3 meter Dish Reflector Kit. (also avaiable on request other Diameter)
307 CM DIAMETER F/D RATIO 0.4
The Kit includes:
16 Ribs pre-assembled
8 Angular reinforcement structure
1 Central Drum
1 Attack must (dia. 45 mm approx. – innocents-)
5 Tube Ø 16 mm shaped for the circumference.
All the necessary mounting hardware (all INOX)
Photo-mounting instructions
All parts are numbered and the entire structure is easily assembled.
For mounting serve three keys: 10, 13 and 8.
The whole structure is made of anodized aluminium avio anti-corodal.
All hardware is STAINLESS steel.
The weight should be around 20/30 Kg (a person can hold it alone)
Once assembled it remains only to apply a mesh (not included in Kit) which
vest more befitting to the frequency on which will be working the parable,
keeping in mind that we can say that the length of the side of the mesh
shall be at least one-tenth of the wavelength of the lowest frequency
(example. 1296 MHz wavelength at least 23 cm knit 2,3 cm). A good
compromise may be from 1.2 cm that is what I have installed on my parable,
who works on 432 MHz 1296 and 2320 with excellent results.
The price is 850.00 euro(excluding shippingcosts),
taking into account the type of materials used
and the workmanship, and also taking into account that a German firm
producing a specimen like this and wants to € 1400.00!!!!
Just for news I built many kits from this dish and I personally tried
with great satisfaction via Tropo 432-1296-2320 MHz and 1296 Mhz EME,
representing that every subsequent construction are applied to minor
improvements.
On request I can provide support for elevation, support for feed (depending
on what you decide to use) and feed.
On request sending other photos via email.
Anyway almost identical to this: http://digilander.libero.it/iz0cls/
Or watch this video: https://www.youtube.com/watch?v=Fxqs7mtuT-A
If you or someone of your friend is interested
Contact to: fabrizio.iz0cls(a)gmail.com or iz0cls(a)libero.it
73 to All! de Fabrzio IZ0CLS
I thought some of you might like to see this note from this week's AMSAT news:
+ Eimac Moonbounce Notes collection
Way back in 1980 when I first got interested in amateur satellites
and AMSAT, I wrote off to Eimac Corporation for their "Moonbounce
Notes" collection.
While on a household paper eradication campaign I came across them
and scanned them. I thought others might enjoy a look back at some
bleeding-edge ham activities from the mid-late 1970s. It's
particularly amusing to see how much effort was spent just tracking
the moon with the technology then available.
http://www.ka9q.net/moonbounce-notes
This is a raw collection of pdf files, but the file names are pretty
descriptive. Collect the entire set!
If anybody has any notes missing from my collection, please let me
know.
[ANS thanks Phil KA9Q for the above information]
I somehow got hold of a number of those Eimac notes in the late 70's, and it was the computer listings for moon position calculation by Lance WA1JXN (W7GJ) that got me started in computing myself, typing it into some automatic test equipment at work and getting output on line print paper, years before I had a Moonbounce station myself. It became a dream and an obsession to make a Moonbounce contact after that.
73
David GM4JJJ
31 Oct: MR 0500utc QRV 144.116 1st JT655b ...... 0700-1000utc QSY
1296.070 +/- preference to JT65
sleep time
31 Oct: 1400-1800utc 144.116 1st JT65b ..... 1800utc Local 2m Net (I am NC)
1 Nov. MR 0600-1000utc 144.116 1st JT65b
sleep time
1400-1800utc 1296.070 +/- ..... 1800utc-?? (2230 MS) 144.116 1st JT65b
If 2m local noise prohibits operating I will switch to
1296. Typically 0700-1800utc are quietest for 2m.
Sunday will offer working VK/ZL/JA and Asia/EU at their MR and Dish
will be in Az range-two (it takes over 30-min for change over between
Az ranges so easier to do in daylight on Saturday).
144-eme: 4x XP20, WA2ODO dual-pol adaptive Rx, 1300w
1296-eme: 4.9m dish, G4DDK, 125w -- Az Ranges: 57-148, 148-248,
248-310 with 10-degree El minimum
Dish has 15-mph wind maximum. Snow expected this weekend.
*** We will be looking to work PJ1/PE1L on both bands during common window
73, Ed - KL7UW
http://www.kl7uw.com
"Kits made by KL7UW"
Dubus Mag business:
dubususa(a)gmail.com
A short message as we are so busy to build up the 432 MHz station
About ur next moonpass:
Moonpass starting November 1 0200 UTC Ending November 1 1500 UTC QRV 432
MHz and some 1296 MHz.
best regards,
Team Sint Maarten
Hi Gents,
Barring any hiccups, I intend being QRV for this lef of the contest as
follows: -
OCT 31 (US window) 12:00Z (moonrise) until about 16:00Z or so
OCT 31 (EU window) 19:00Z until moonset 22:50Z
and
NOV 1 (US window) 13:00Z (moonrise) until about 16:00Z or so.
NOV 1 (EU window) 18:00Z until about 21:00Z
Cheers,
Allan
VK4EME
QG63kq
16x15 full polarity (open-wire & 1/2" heliax feed)
FHX35 cavity preamp + MGF1302 postamp
120W
Skeds welcome almost anytime :-)
I will be QRV tonight for ARRL EME contest on 70cm with the 9.2m dish and polarity rotation.
Just now got everything going on 432Mhz after a 3 year absence. Sun noise looks very promising.
Gary, N8CQ
Eimac 8938 1.5KW, K4MEME preamp, Loop feed (aka OK1DFC style with scalar), 9.2m dish
