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 ...
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Sri I made, at least a mistake, I send it again.
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
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:
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:
TX: 1296.070 -1.5KHz = 1296.0685MHz
RX: 1296.070 +1.5KHz= 1296.0715MHz
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
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
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.
Its been awhile since I have been QRV with my 2m-eme station.
Four independent problems in my transmission line during the winter
kept me off the Moon and then my HVPS acted up. Well it turned out
to be a simple problem but it didn't appear that way. My 4kV dropped
to 2.8kV without a load. I envisioned all kinds of problems but in
the end it was simply a blown HV fuse. It did not blow open but
instead went to 16meg-ohm which was enough to drop the HV with very
low current being drawn by the HV panel meter.
Having no replacement fuse, I decided to remove the HB fuse holder
from the HVPS since changing the fuse required removing the 8877 deck
from the rack to gain access thru the HVPS top plate which is
directly under the amplifier. I will order some more HV fuses from
Nebraska sales ($25/ea.) and make an inline HV fuse box which will be
much quicker access to replace a fuse. Actually, I have only blown
two of these fuses in 8-years of running.
How I blew this one is that the 6-dB attenuator that I was using to
lower drive to my transverter to keep drive below 50w to the 8877
failed in short resulting in over 100w drive to the 8877. Anode
current spiked taking out the HV fuse as it is designed to
do. Probably hit over 2kW output!
A couple other improvements will make recovery from HV events
quicker: I brought the 240vac mains fuses to the front panel of the
HVPS and increased them to 20A. And I added a vernier to the 8877
drive input cap. Looks like I got a finer tune on the input as it is
taking less drive to reach 1200w.
I will be QRV Sunday from about 1400utc to 1700utc (Moonset):
144.116, 1st for CQ and on N0UK logger. Mon> I will be trying to
work 6W/PE1L in Senegal very early in my morning. We only have about
30-min common Moon on Monday but this increases on subsequent days.
73, Ed - KL7UW
"Kits made by KL7UW"
Dubus Mag business:
i heve :
3 meter Dish Reflector Kit. (also avaiable on request other Diameter)
307 CM DIAMETER F/D RATIO 0.4
The Kit includes:
8 Ribs pre-assembled (or 16 ribs)
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)
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 of 700.00 euro (850.00 euro for 16 ribs) (excluding shipping
costs) is not negotiable, 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 parable 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
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
Hi EME gang, anybody knows e-mail address to W5ZN and W4ZRZ please? Worked
on 27th of December KT1J as a #37 WAS - VT on 432 MHz and looking for
Answer please direct to my address.
Thank you in advance and HNY 2015 to all.
Zdenek - OK1DFC
QRV 144 - 3400 MHz EME - QRO and 10m DISH
WAC 432 - 1296 - 2320 MHz
DXCC 432 MHz
I was QRV 28. Dec. on 144MHz CW EME for a short time after my moonrise
and found excellent conditions with signals I never seen before !!!!
Maybe the moon was closer to the earth that day ??? Have any heard about
this ??? (-: (-:
Thanks for the QSO's and for exchange Happy New Year via the moon.
Thanks to all for the QSO's in 2014 and I wish You and Your family a Happy
and Healty New Year 2015 with many more EME QSO's and great fun.
Best 73, Jorgen OZ1HNE.
The answer is valid for either a 1/4L or 1/2L style of 2 way
If we label the common port as '1' and the 2 antenna ports as '2' and
The RTL you should measure at the design frequency is:
s(1,1) -infinity (in an ideal world), anything like -40dB on the bench
s(1,2) and s(1,3) -3.01dB
s(2,3) or s(3,2) -6.02 dB
s(2,2) and s(3,3) -infinity......
This assumes all the ports are terminated in 50R and calibrated at the
connector plane !
A simple test which demonstrates the insensitivity of these types of
combiners is to deliberately mis-terminate a
port with a known VSWR, say 1.5:1.....
If you make port 3 75R you will see s(2,3) drop 1db, i.e -7.02dB.
s(1,1) will still be better than -20 dB.
So, fault finding even small VSWR deviations in the overall set-up can
become rather diffcult without a network analyser.
Now for another interesting result, remove the load at port 2 or port 3
and check again.
The best RTL for s(1,1) will have moved to twice the design frequency,
868MHz and the RTL at the design
frequency will have dropped to ~9.5db (VSWR 2:1). This is the
theoretical and practical result if its functioning correctly.
Now if we connect a real antenna there can be some more horrific
results, needless to say one should try and get both
antennas to the same match (of course it won't be 50R) such that they
present the "similar" loads to the combiner.
I would also test the behavior of the RTL set-up with some known
mismatches to verify all is well.