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.
Anybody using a 144 mc LNA device called ALN0140WT ?
Specs look very interesting .. but are they for sale ???
73's Rick ,PA1BVM
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There was very nice CW activity during ARRL contest this year (on all bands except 2m from US) and it is unfortunate I did not have a lot of free time for it.
I also “worked” JT65 logger eme (I thought: who is going to find out anyway??) and apart from constant chatter I also found JAMMING.... a lot of Jamming, even from its own creator!!?
Check a small part of it from N0UK logger:
11/19 17:04 VE3KH you being jammed by K1JT and W6YX (W7IUV Larry WA DN07dg 188.8.131.52)
11/19 17:05 Why Larry .... they on 142 also? (VE3KH Kevin ON FN03aj 184.108.40.206)
11/19 17:06 They are calling me to get a contest poitn and it ain't gonna happen!! (W7IUV Larry WA DN07dg 220.127.116.11)
11/19 17:08 Thansk Larry 73 ... Yes, I have been jumped by a quite a few stations (VE3KH Kevin ON FN03aj 18.104.22.168)
11/20 17:47 Also hr k1jt calling me -22 but not ans him (KN4SM/5WL/KW Jerry VA FM16qt 22.214.171.124)
11/20 18:02 Contest = reduced courtesy! (K5DOG/2M Stevedog NM DM52xw 126.96.36.199)
11/20 18:04 Yes, K1JT and W3SZ can hear on gold tooth. (K5DOG/2M Stevedog NM DM52xw 188.8.131.52)
One thing I wouldn’t regret missing on EME is JAMMING!!!
GL 73, Petros SV3AAF
It has been a topic here about 3 to 4 weeks ago.
Despite all I bought the largest off those Rotator.
The Big RAS/HR
After I received it I did connect all the cable.
The rotator works fine. I can controll the rotator with MD-01 controll box.
Then we connected USB and all the sudden the elevation readout startet
on counting down.
Even when the rotator turned up it counted down.
Trying to find the problem. (Testing cables, connections etc)
all the sudden AZ is now also only counting up. left or right no diffrence.
As well the newly installed LAN modul is not working.
The programm is seen the controller but those not communicate with it.
Can someone give a hint where I should start looking for the fault.
Is the fault in the hall sensor or is it in the controll box
as there is not schematic available, I can not search for the fault.
And sending the rotator trough half off europe doesn't make sense either.
vy 73 de Michel
Thanks for your reply(s) Daniel et al. My Kuhne PA will go as high as 140W,
as per kuhne. Yes, I have been on JT65C listening. I did login to HB9Q
logger about 3-4 hours ago. The UTC time listed on the logs seemed to be 2
hours behind though so that was confusing. Can anyone tell me why?
I understand that next weekend Sunday should be good, so I will be QRV for
listening at least.
Thank you to all who responded for your support. I hope to make a real QSO
on EME soon. I also see via one of the EME planners that the ON0EME beacon
should be available to me next weekend, which will help confirm my receive
capabilities. I have a 24Y with the 27db gain LNA so I hope I have enough
sensitivity to hear the beacon and/or one of the big guns.
CN89tb on the west coast of Canada
Nice sunny day yesterday so I though I would test some more.
With the standard set up using a sma transfer relay I measured only
8.7 dB sun/cs.*
Suspecting the sma-elbow and relay, I connected the LNA
direct. First I measured with the LNA unconnected at -75 dBm. The
SDR-IQ noise floor looking into the output of the 1296-28 transverter
is -76 dBm with xvtr off and -76.5 dBm with it on (no LNA).
With LNA directly connected to a 50-ohm sma termination I read -72.5
dBm. CS = -75.5 dBm for a 3-dB hot/cold reading.
Looking at the sun I got -65 dBm for a 10.5 dBm sun/cs*. That is 1.8
dB better than when the elbow+ relay are in line!
I tested with only the relay and got -67.4 dBm for sun noise which is
2.4 dB lower than with the LNA direct - wow! I tired a HP mw relay
and sun noise was -66.2 dBm (half the loss seen with the transfer relay).
Figuring that the effect was mainly on system NF, I inserted some
loss numbers into the VK3UM calculator and determined the loss ahead
of the LNA was 0.96 dB to account for 2.4 dB drop in sun noise. The
better relay looked to be 0.43 dB insertion loss.
I guess I will be testing some relays to try getting this down to <
0.2 dB insertion loss.
I didn't test the elbow by itself, so should do that to see if it is
worse than a short length of .141.
*VK3UM Calc indicates I should be seeing 12.87 dB sun/cs (108sfu)
with a septum+collar ring into my 4.9m dish, so still need to get 2
more dB of performance out of the feed.
WE had a very unusual rain storm with much lightning last
night. Overcast today so will not do any testing today. Hope that
didnot affect any of the LNA's.
73, Ed - KL7UW
"Kits made by KL7UW"