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
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.
For newcomers: The idea of activity weekends is to encourage activity on the higher microwave bands outside contest weekends. There are no restrictions... if you wish then use the logger, telephone, HF....and use any mode. It is not a contest. It enables everyone to make QSOs, test new equipment, feeds, preamps etc. Hopefully some of the big guns get on and provide signals for newcomers to look for.
Although co-incidence of lowest loss and high declination ( which we know gives the highest levels of activity) is slowly getting better year by year it is still hard to find good weekend dates not already committed.
My proposals for 2016 are June 11/12 9cm, July 30/31 3cm, August 27/28 6cm, and September 17/18 13cm
If anyone has any better suggestions, please make them. In past years these weekends have proved useful but there is no pressure to participate!
GL73 Peter G3LTF
We do have some complete build and tested OE5JFL standalone antenna
trackers left after our Heelweg meeting.
More info about this design see the site from Johannes:
If you are interested please contact me off list.
In case you want to reduce the shippingcosts: we can take them to Hamradio
in Friedrichshafen end june and to the EME conference in august in Venice.
All boards are build and tested. No MAB25 encoders enclosed but can be
ordered if you need them.
In case there are more demands then available boards we will prepare 10 new
Jurgen PE1LWT and Johan PA3FPQ
For Sale: 24 GHz Experimenter's gear
Due to "thinning the herd" and moving, I am selling my entire collection of 24 GHz gear. Not an assembled station, but a useful collection of experimenter's parts.
Includes 2 DB6NT Transverters, transmit modules, receive modules, preamps, power amplifiers, oscillators, doublers, antenna feeds, small dishes, transitions, detectors, wave meters, cartridge diodes, all manner of waveguide stuff... And a pair of HP 11517A 12-40 GHz spectrum analyzer range extenders. Over 80 pieces in all. And a pile of documentation with sweeps and characterizations.
As I recall, everything works but, of course, I can't guarantee it. This certainly isn't a beginners project but if you are into expanding your microwave horizons, here are a lot of really useful pieces. The whole collection is being sold as one piece.
I have a complete list and pictures; contact me off list. $1500 OBO (I'll ship in continental US)
Ed Krome K9EK
Hey guys I am putting together a small digital station for next winter when I go back to St. Martin island in the French Antilles.
I will be using an FT857D a laptop computer & this new interface from G3LIV. It was recommended to me by a friend of mine who is very familiar with mobile operations. It appears very simple to use with the soundcard of the computer & isolation transformers
Check out Johnny 's web site http://www.g3liv.co.uk/