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
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
http://www.kl7uw.com
"Kits made by KL7UW"
Dubus Mag business:
dubususa(a)gmail.com
Despite the minus 25-30 Degree C weather I activated the station for the 432 contest.
Activity is lower than previous years and an elevated K index disturbed conditions.
The following stations were worked this weekend;
N4GJV, ES5PC, VK3UM, JA6AHB, I1NDP, OK1CA, UA3PTW, SP6JLW, LZ1DX, NC1I, DL9KR, SP7DCS.
Huge signals this weekend from DL9KR, NC1I, UA3PTW, OK1CA, and VK3UM despite the disturbances, and apogee conditions.
I called W1AW/4 and received QRZ's, and heard the following with no opportunity to call, DL7APV, DF3RU, PA3?, and IK2OLO?.
Overall a fun weekend and nice to hear some of the big signals make it back from the moon.
I also managed to work WA4NJP as W1AW/4 prior to the contest period.
I hope to make it on for the 13 cm contest next month.
73's to all and thanks to the stations who got on.
Grant
VE6TA
DO33gs
Our overall period of operation begins at 0000 UTC September 3, 2014
(Tuesday evening September 2, 8PM EDT/7PM CDT) and ends at 2359 UTC on
September 9, 2014.
Greetings all,
I have been authorized to operate as W1AW/4 during the upcoming ARRL
Centennial week in TN. I will be running 4 X 2M12's with AZ/EL and 800-900W
output on JT65B from EM75wx, and I plan to operate as much as my schedule
permits. I will be monitoring and posting on the N0UK EME page.
GL and 73,
Phil - N1KI
Hello All,
I feel I should give you all an update about current possibilities
activating Gibraltar on 144 MHz EME.
Gibraltar is no CEPT country so one must apply for a temporary permit with
Gibraltar Regulatory Authority http://www.gra.gi/
As some probably know the regulation scheme has changed in mid of 2007.
Until that day some 200 watts out or so were permitted on 2 m, since then it
is 100 W ERP(!!!) which is ridiculous since it renders any VHF dx activity
impossible. HF reciprocal licenses are not granted at all since 2007.
Planning for a dxpedition in 2008, I had some extensive discussions with GRA
then and also - without reaction - approached the president of the Gibraltar
Amateur Radio Society GARS http://www.gibradio.net/index.htm
Eventually an officer at GRA told me that the current regulations were
decided in close collaboration with the GARS. He even mentioned they (GRA)
would be willing to make an exception if I applied to GARS and GARS
expressed their consent. As written before, no reply from our ZB ham
"friends" at GARS.
Some years later Colin, G4ZFJ, who believed he had some advantage being a
British citizen and holding a British license, tried to get a reciprocal
license, also without success. For the same reasons.
This year I tried again and was at least successful getting a reply from the
current GARS president Ronald ZB2B ex ZB3B. It was a friendly discussion in
the beginning, However, when I mentioned that an officer at GRA told me in
2008 that GRA would be willing to make an exception for a EME dxpedition and
grant a special high power license if only the local Amateur Radio Society
GARS would be in favour of that activity the tone of discussion changed.
Ronald denied having any influence on the regulator 's decision and said he
would regard it offensive (!) if I continued giving the impression that the
ZB amateurs would have a say when it comes to exceptions like that one
needed. That was the point I felt I better stopped the email exchange.
I do have some understanding for the problems the ZB amateurs faced in the
past when QROOO HF dxpeditions travelled there, maybe caused some severe
interference from a location in central Gibraltar and the ZB amateurs had to
take the blame after the dxpedition left.
However, it is disappointing that even since did not make a difference that
I could explain to them that DH7FB's and my dxpedition in April 2007 at the
Caleta hotel (East of rock, outside of town) as QTH did not cause a single
complaint from inside or outside the hotel as did other 2 m dxpeditions to
that hotel before (for example ZB2/DL5MAE).
So it looks like ZB will reach the level of Mount Athos SV/A in the years to
come.very sad.and very annoying.
73 Bernd DF2ZC
Thanks for your comments guys, here is another one from the Monday in Pleumeur-Bodou
https://www.youtube.com/watch?v=3JBnKEsw40c
a third one I hope to publish tomorrow
73 de Ben
