if you've anything to contribute this month, please send to me at the usual
john at g4bao.com.
Full articles for Scatterpoint to Roger
editor at microwavers.org
FYI I also intercept that email address
73 and thanks
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 ...
The information in this email may be confidential and/or privileged. This email is intended to be reviewed by only the individual or organization named above. If you are not the intended recipient or an authorized representative of the intended recipient, you are hereby notified that any review, dissemination or copying of this email and its attachments, if any, or the information contained herein is prohibited. If you have received this email in error, please immediately notify the sender by return email and delete this email from your system.
I was active for about
one hour on
saturday and 2.5 hours on sunday, at moon set,
in ARRL EME contest
25 QSO and two stations
lost. Many thanks to these operators which responded to my QRZ many times!
They both were too
persistant to call me for a long time but I was not able to
recognise the callsigns. Moon was on the horizon and signals were
weak. It was on saturday at
10,46 UTC. As usually it was
contest,good activity. Hope to be more lucky during
TNX and 73,
Hello EME Friends,
Yesterday we upgraded the 1296 EME setup at club station W2ZQ to include
wideband receiving and Q65 decoding using Linrad and MAP65. For the
possible interest of others, I'll give a brief description of our
present setup and what it does.
Our LNA and 250 W SSPA are located at the 3m dish. We're now using the
following chain of hardware and software components in the shack:
IC-9700 -> PTRX -> RSPduo -> Linrad -> MAP65
(In case this diagram displays poorly in you email reader, an equivalent
.txt file is attached.)
Our Icom IC-9700 is outfitted with the Leo-Bodnar board for GPS locking
and the PTRX-9700 to provide wideband IF at 367 MHz. The PTRX sends the
IF signal to an RSPduo controlled by the Linrad-5.01 version built by
Franco Venturi, K4VZ:
Franco's Linrad build has excellent plug-and-play support for the
SDRplay v3.11 API.
Linrad sends I/Q data in timf2 format to MAP65. The Linrad wide
waterfall is configured to display a 90 kHz sub-band, 1296.000 to
1296.090, and its high-resolution graph provides a zoomed-in display 3
kHz wide at the selected Rx frequency. MAP65's "Wide Graph" waterfall
displays the same 90 kHz sub-band, also with an accompanying zoomed-in
display, and the program decodes all Q65-60C activity found in the 90
kHz range. When interested mainly in Q65 QSOs, we move the displayed
range up to something more like 1296.040 - 1296.130.
For Q65 QSOs we activate WSJT-X to take care of Doppler control,
transmitting, and narrow-band reception of our QSO partner. For CW QSOs
we activate CWtype and terminate WSJT-X.
We find that this setup provides an extremely capable receiving system
for 1296 EME in both CW and Q65, with high-sensitivity waterfalls
showing all CW and Q65 activity in a 90 kHz wide EME sub-band. MAP65
decodes all Q65-60C signals in the displayed range, WSJT-X conducts Q65
QSOs, and a simple mouse-click sends any visible CW signal to the
headphones for CW QSOs.
We'll be very interested in communicating with others who are doing
something similar to what's described here. If we haven't already
worked you in the ARRL EME contest, please look for us in either CW or
Q65 during the November 12-13 weekend!
One further comment, for possible future discussion. MAP65 v3.0
currently supports only the 60-second submodes of Q65. Our experience
is that most 1296 EME stations (say, 2m dish or larger) can work each
other easily using Q65-30B -- an obvious potential advantage of twice
the QSO rate in EME contests. Would it be useful to agree on some
sub-band, perhaps 1296.100 to 1296.150, for Q65-30B activity? MAP65
might then be upgraded accordingly, to handle 30-second sequencing.
With best wishes,
-- 73, Joe, K1JT
I wrote an e-mail to Remco PA3FYM (just mailed in the past) but I got a failure feedback of “spam message rejected” from the AMSAT mail server of his account.
I ask if anybody can help me.
Tnx es 73 de
Via Santa Marta, 26
20871 Vimercate (MB) - Italy
IZ2EWV amateur radio station
ITU 28 – CQ 15 – WWL JN45qo
iz2ewv(a)alice.it <mailto:firstname.lastname@example.org> / iz2ewv(a)gmail.com <mailto:email@example.com>
Georgia 23cm and 222Mhz EME activation on November 4-5
* EM70NR - Georgia - 2200UTC Nov 4 - 0300UTC Nov 5 - Plan to operate on 23cm and 222 Mhz from Lake Seminole on the Georgia/Florida border. I dont believe my new relays for 70cm will have arrived by then
Al, K2UYH, and Matej, OK1TEH, are working on the 432MHz and above EME Newsletter this week.
Send all your news, especially about your activity in the first 50-1296MHz weekend of the ARRL EME 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
Dear all, I've recently become qrv on 23cms eme with my homebrew 0.38 f/d
dish and square septum.
My thoughts are turning to improvements. I am looking at making a round
Kumar choke to fit to the feed.
For an initial tryout I was thinking of making the choke from galvanised
wire mesh rather than the more usual aluminium sheet.
I wondered if this method would work ok and if anyone has any practical
experience of making a mesh choke.
The proposed material is 12.7mm (1/2") square.
I look forward to hearing any comments.