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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Any of you have a FT 991 for radio. according to what I read it does not required an Interface for digital work which include WSJT X. It has a soundcard but where is the interface????
I am considering a mobile radio which I can carry around easily like a FT857 or a FT991.
Please give me your comments & suggestion off line.
Thank you very much
I have a plan
I would like to apply, but step py step for EME of new stations .... I wld
like apply 6m & 70cm & 23cm ... the question what the first band I start ?
from above I have just ft-2000d & ft857
On 25 Jun 2016 1:01 p.m., <moon-net-request(a)mailman.pe1itr.com> wrote:
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> Today's Topics:
> 1. QRV 144 eme (Mike White)
> 2. Re: KL6M EME Reborn (Bob McCormick W1QA)
> 3. Re: 1296MHz Scalar ring on small dish. Good or no good? (Andy)
> Message: 1
> Date: Fri, 24 Jun 2016 22:35:56 +0000 (UTC)
> From: Mike White <k7uls(a)yahoo.com>
> Subject: [Moon-Net] QRV 144 eme
> To: "moon-net(a)mailman.pe1itr.com" <moon-net(a)mailman.pe1itr.com>
> Content-Type: text/plain; charset="utf-8"
> I will be qrv this weekend starting tonight 144Mhz with 2x12 350w full
> az/el will post to N0UK for freq and seq.de K7ULS
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.
I was listening only, having made some more improvements since the DUBUS 3cm contest weekend, and I now believe I have the dish structure and focus as good as I can get them. Still using a non optimised feed but a new one is under way. I will now start the process of converting the manually controlled “ lash up” into a fully usable system, including a PA..
I was only on for Sunday but in the short window that I have I heard HB9Q, OK1KIR, OZ1LPR, all big signals especially Peter, OZ1LPR. I could just copy SM6CKU and partially copy IZ1DJP and SA6BUN. Moon noise was 0.9dB . I know there are more improvements that I can make to feed and preamp NF.
I’m glad everyone enjoyed it and the kind comments are appreciated, (but its not really a lot of work!)
I was also delighted to work ZS6EME during the week on 13cm ssb and today on CW IK5QLO with an excellent signal.
GL 73 Peter
I start to build on our new ME2XP dual RX high performance 2m transverters.
Features:( 2x RX & single TX, IF 28 or 14MHz)
- variable gain btn 10 to +25dB
- PGA103+ front end < 1dB NF
- +17dBm CSYM-1815 RF mixer
- LO with high stability AXTAL TCXO ( <0.5ppm, sidenoise < -150dBc @ 10KHz)
- High dinamics IF amplifier( OIP3 >40dBm)
- Tx out 30 or 50W ( variable fm 5W up to full PWR)
- +17dBm CSYM1815 TX mixer
- -20 to +37dBm IF input ( jumperable)
- fan speed control ( depend from heatsink tmp)
- LCD screen( PWR,DC voltage, TMP etc)
- built in seq for ext. PA
- complete in box, ready to use
Please send your suggestions, request etc. for me ( any modification, supplement is in time yet)
Ezt az e-mailt az Avast víruskereső szoftver átvizsgálta.
Tom, if the azimuth axis is not perfectly vertical (never is perfect) the
actual azimuth direction has a built in error that is related to the amount
and direction of the axis tilt and the elevation angle.
Without getting into the details I will give you an extreme example of the
obscure and not well understood problem:
Assume you live at a latitude that allows the moon to reach an elevation of
90 degrees. Further assume that there is an azimuth axis tilt of .5
degrees toward the east and the moon is passing through a calculated direction of
The calculated azimuth axis would be straight up. The tilt toward the east
changes the axis from a calculated value of 180 degrees to an actual angle
of only 90 degrees. The elevation angle is reduced from 90 degrees to 89.5
This is an extreme example but the trend and concept is present for other
latitudes and tilt directions. This is the same problem that is encountered
with multiple side by side feeds in a dish. Working with Al, W5LUA in the
past we have been able to mathematically correct his errors to a large
degree. On my own system, the tower has a slight lean toward the southeast that
requires a correction of about 2 degrees in azimuth as the moon passes
through zenith. The correction varies as the declination and elevation angle
I hope this is the issue you were asking about. If not, please ignore this.
In a message dated 7/26/2016 4:41:53 P.M. Central Daylight Time,
If on 3 cm auto tracking and must correct moon noise during a QSO?
I am trying to understand why the auto tracking does not do 100% correct
the cause may be various reasons?.
Those on 3 cm or 5760 and auto tracking,
drop a note on what you find and if have found a cure of the error problem.
Try to change the W2DRZ controller and AB encoders to hi res (16 bit) on
encoders to see if that changes the tracking error.
the USD encoders will then do about 14 bit resolution or "1 tenth a degree"
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