Hello. I’m building a 10ghz eme station and am in need of an amp. Looking for twt or sspa. Please contact me off list if you have something excess to your needs. Tnx. 73. Gary. W4AF
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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A possible solution may be the PGA144 preamp.
This was designed to have minimal input matching losses, to achieve a low noise figure. A number of well known VHF DXers (LA8AK, DJ7VY, and one of the YUs) previously recommended the best way to do this was to use a very low loss, high pass filter in front of the active device to suppress the strong VHF band 2 FM signals whilst adding minimal extra loss before the active device. G4SWX added the refinement of an additional band 2 notch, to give even more suppression, whilst adding very little extra additional loss.
In front of a PGA103+ this arrangement gives excellent IIP3 with a noise figure around 0.5dB. This is marginally good enough 144MHz EME noise figure in a quiet rural location, but probably quite adequate in most other locations. This also works very well on 432MHz, with the notch at 144MHz!
I still have some PCBs and PGA103+ devices left, after I closed the DDKits business last year. If anyone is interested, please contact me. I can also bring some PCBs and devices to Prague, later this week. I do need to limit the amount, however.
Www.g4ddk.com for further information
73 de Sam, G4DDK
Hello boys,
I tell you about a problem that we encountered in my club station after
installing the new 432 MHz Yagi. It isn’t strictly related to EME because
we were working in FT8 but I think that this group is the best for dealing
with weak signals and interferences.
Beaming to an interesting direction (and from the sidelobes) we receive a
“hair-comb” like you can see in the photo…
Does anybody of you have a solution in the hat for a audio filtering method
to kill this noise?
Obviously we cannot identify the source and, even if we would be able, it
is not sure that we could remove it!
Tnx es 73 de
Alberto, IZ2EWV
I have been trying to download and install WSJT.2.6.0-rc3 and windows 11
says "unconfirmed 570431.crdownload" I have tried to download and run from
the Princeton and Source forge with no luck. Yes I shouldn't have let the
computer upgrade but can anyone help?
73
Richard
WC8RK
Note new Email "gkreute(a)gmail.com"
Dear EME 2022 delegates.
In the questions from the audience part of my presentation, Charlie,
DL3WDG, asked a question that I would like to elaborate somewhat on, as
there was not enough time to deep dive into the details from the stage at
that occasion. I have also discussed this question with Paul, W1GHZ.
The question was:
"There is a disclaimer in the Feed_GT plot of 'Real world efficiency at
least 15 percent points down from the reading'. Do you have any information
if this would be different with different f/D's and how much can you
believe the efficiency curve in Feed_GT and where does this reduction come
from"?
The longer answer would be:
The terms that are not well modeled would be:
- diffraction from the edge of the dish
- dish surface accuracy
- additional real world blocking that is not included in the feed size
blockage
- diffraction and reflections from any feed support structure
- misalignment of the feed
These are either difficult to estimate with good accuracy or will be
different for each installation depending on the mechanical structure. It
is therefore not meaningful to implement any compensation for them in the
calculation, at this stage.
The amount of diffraction from the edge (rim) would be larger with an over
illuminated dish compared with an under illuminated dish. The estimated
loss from the cross polar contribution will be under estimated for low
f/D's if only the E and H-planes are evaluated as the cross polar error
will be higher in the diagonal cuts (pure geometry). However, in Feed_GT
the simulated data from the diagonal cuts of the feed evaluated is included.
When coming down to single percentage points in the efficiency calculation,
even nuts and bolts, dirt on the surface and the quality of any joints in
the surface counts. Maybe we are not yet there :-)
The "more than 15 percent points reduction" is, as I said in my answer from
the stage, to a large part derived from real world experience and
measurements. You can estimate your total efficiency by doing some
measurements using celestial sources (i.e. Sun, Moon or other known sources
depending on what band you are evaluating) together with Ground to Cold Sky
noise.
The relative performance from one feed to another would have good relevance
and accuracy and the absolute efficiency value would be fairly close using
the 15 percent points reduction. But, it is of course very much dependent
on your own installation and what you have added in the form of mounting HW
etc. etc. YMMV.
I hope this satisfies the level of decency in an answer on details in a
presentation :-)
The question triggered my curiosity (Thanks Charlie!) so I may try to see
if it is possible to find a way to get a slightly better estimation of the
diffraction loss. No promises, but I will think about it.
73 / Ingolf, SM6FHZ
--
Ingolf, SM6FHZ
http://www.2ingandlin.se/SM6FHZ.htm
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Hello EME friends, If you are looking for High Quality ATTENUATORS, i have for
sale. Made by API/INMET/WEINSCHEL:Power: 2W -Connector: SMA or APC3.5 Male/Female-Values: 3, 4, 5, 6, 9, 10 and 20dB -Frequency: DC-18GHz, also usable up to 24Ghz (tested)-Many pcs available at an interesting price €10,- +
shipping for 1 pcs-Data Sheets available Made by MCL/INMET/WEINSCHELPower: 5W-Connector: SMA Male/Female-Values: 3 and 20dB-Frequency: DC-18GHz-Data Sheets available Made by AEROFLEX/WEINSCHELPower: 50W-Connector: N Male/Female-Value: 10dB-Frequency: DC-18GHz-Data Sheet available Email me direct for pictures and detailed information. 73s de Jac, PA3DZL
QRV EME-MOONBOUNCE on
2m, 70, 23, 13, 9, 6 and 3cm
Al, K2UYH, and Matej, OK1TEH, are working on the 432 and above EME Newsletter this week.
Send all your news, especially about your activity in the 9cm Dubus-REF contest, the first microwave weekend of the ARRL EME contest and with recent DX-peditions, plus any technical items and interesting pictures to alkatz(a)tcnj.edu
Previous NL can be found at http://www.nitehawk.com/rasmit/em70cm.html
73,
Peter G3LTF
