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.
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.
I have no special contest plans other than I will be qrv in cw random calling cq on 2m-70cm-23cm. Hope gear at eme qth is ok. Emphasis will be on 144&432MHz so as to help increase cw activity on those 2 beloved bands. Pls note that I have bad qrn on 2m at moonset window even at high elevation, but will hang in there.
A tip: due to poor moon conditions and especially deep qsb minimums expected on 2m, when you hear qrz send your call a few more times for the period(s) needed, and be patient. QSO reward in this mode deserves the extra effort.
Want to wish GL to all participating stations and hope mixed and digital stations attempt to have fun in cw also. It is not about the numbers or dxcc's, it is about the moon journey...either spacecraft man guided or not, has its merits and joy.
2m: 16*6el xpol
70&23cm: 6.1m dishes
As a follow up to my analysis of the 1st leg of the contest, I found that
an additional 51 new stations were active in the second leg, bringing the
total to 357 stations per KB8RQs 18,000 decodes.
As Gary did spend a large part of his time CQing 2nd period, there may be
more stations, specifically in the US, that were not seen decoded. If a
large European station with good ears would send me their Map65rx file, I
would gladly compare and combine for a grand total of participants, at
least for 2M JT65B
Over the weekends, I had a blast and worked a total of 130 with my
moderate setup. I decoded close to 250 station. My limitation was not
having enough time to work all the stations I saw on Map-65, before they
Thanks to all who worked me. Next year look for me on 1296.
On Mon, Oct 28, 2013 at 10:51 PM, Les Listwa <llistwa(a)gmail.com> wrote:
> Did that get your attention? Yes, 306 EME stations logged in the first
> weekend of the contest on 2M with JT65b.
> So how many did you work? Now mind you, I did not say "worked", I said
> "logged". And I did not say it was me.
> During the contest, I was wondering how many stations I missed and could
> of worked, if I had the time.....then I wondered how many stations actually
> participated in the contest, not just the few who submitted logs to the
> ARRL, but all those who got on over the weekend and generated some RF.
> So I turned to Gary KB8RQ, who as we know has the best ears in the
> Americas, who provided me his Map65rx file. That file records every
> decode in .txt format that Map-65 makes, as it looks over the complete
> frequency range and not just .127 where Gary can always be found making
> noise. Gary was kind enough to share his file which contained about 10000
> decodes and after converting it to Excel and removing duplicates, the
> grand total was 306 different station calls it decoded here in the US
> during the first contest weekend.
> It is possible there were some additional European stations that came on
> and left before the US Moon rise. If a big gun in Europe will provide me
> their file, I will add it to Gary's, after duplicates are removed and we
> will have the full total.
> Credit goes to W3SZ for the idea of parsing the file in Excel, as he did,
> when analyzing the performance of Map-65 vs WSJT.
I plan to be active in the contest next weekend on 6cm. I checked out the system today and I am getting improved echoes following the dish rebuild. I should be on from about 1000 on Saturday and 1100 Sunday weather permitting.
Running 6m dish with 24W, (maybe 48W) Rules are at http://www.marsport.org.uk/dubus/EMEContest2014.pdf
Al, K2UYH tells me “ I plan to be QRV during both of my VK/JA windows to very close to my moonset. For the EU window, I should be QRV starting about 1730 and 1830 for the 2 days respectively. “
GL and 73 to all. Peter G3LTF
I recently had an 830 MHz cavity and good 3cx88U7 come into my hands.
I'm wondering if anyone thinks it could be possible to modify this cavity and tube to run on 1296 MHz? The datasheet seems to imply that only 33% efficiency is obtained at 900 MHz, it must be less even higher. Perhaps there is no advantage over a 2c39 in this case.