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
Alberto,
Thank you for the response and asking the software developer the question:
Ø I asked the software developer of the FDM-SW2 program about your
question.
Ø He said that the demodulated outputs of the channels corresponding to the
two IF frequencies that you would feed combined into the DUO,
Ø presently can be combined into VAC, but either at 48 or 192 kHz, not 96,
as a final sampling frequency...
Ø but he said also that if this is a requirements, it would not be too
complicated to add the 96 kHz capability...
I am not sure if we have got something wrong in the wording or translation
of my question. The output required to drive Joes MAP65 software is not
demodulated but two separate streams of 96KHz sample rate I & Q. These I
hope to produce from two different, but locked, IF channels from the H and V
signals from my 144MHz X-pol array.
To overcome the need for two A/D converters, ie ANAN 200D or two separate
locked receivers, I would like to use two different frequency IFs. Both
being locked to a 10MHz reference, filtered and combined in order to drive a
single receiver A/D converter and recover both I&Q for both IFs in software.
I already have a pair of G4DDK 144MHz transverters driven by a G4HUP locked
116MHz source. I have been testing a scheme whereby I filter both 28MHz Ifs
and mix one down to 18MHz using the 10MHz reference.
It should be possible to perform basic functionality tests for such a scheme
without VHF transverters. If one receiver is set on 14MHz and the other on
21MHz it should be possible to use MAP65 software simultaneous decoding HF
JT65 transmissions from each band but displayed as pure H or V
polarisations.
I hope that makes my question a little clearer.
73
John G4SWX
Date: Mon, 23 Feb 2015 10:47:43 +0100
From: Alberto di Bene <dibene(a)usa.net>
Subject: Re: [Moon-Net] SMALL VHF TRANSCEIVERS
To: moon-net(a)mailman.pe1itr.com
Message-ID: <54EAF73F.9060008(a)usa.net>
Content-Type: text/plain; charset="windows-1252"
On 2/22/2015 9:45 PM, John Regnault wrote:
> /After having read the attractive spec of this transceiver this raises
> a fairly complex question:/ /The Elad Duo can be run in a dual
> receiver mode. I am unsure as whether this transceiver in its dual
> receiver mode could be fed simultaneously directly into MAP65 at
> 96KSPS rate per channel./ / / /If that is the case and I fed the
> receiver with 2 frequency independent, but locked transverter IFs
> corresponding to V and H polarisations(I can solve that part) I would
> have a flexible transceiver with a MAP65 capability./
John,
I asked the software developer of the FDM-SW2 program about your
question.
He said that the demodulated outputs of the channels corresponding to the
two IF frequencies that you would feed combined into the DUO, presently can
be combined into VAC, but either at 48 or 192 kHz, not 96, as a final
sampling frequency...
but he said also that if this is a requirements, it would not be too
complicated to add the 96 kHz capability...
I will contact him again in a few days to know if/when that modification
will be done.
73 Alberto I2PHD
I have finished some maint. on my 2m eme station and have the array
back up for use.
I decided to remove my secondary TR relays (HP8765A) from the system
as the NARDA relays test >100 dB isolation. I kept the
double-shielded RG142 coax jumpers from the preamps to the TR relay
and continue to use RG-58 for dc supply (to avoid RF pickup on the
preamp power leads).
The other reason to remove the HP relays is their possible use for
3400-MHz (eme).
Progress continues on the 1296-eme system: I rebuilt my LNA into a
new larger enclosure with seals at the coax connectors. Also allows
me to add a second LNA to buffer gain needed for running MAP65.
The driver remains to be installed and final Tx tests. LNA need to
be reinstalled (15-min job). And one wheel replaced on the azimuth carriage.
I may be QRV on 2m around MR (2300utc Feb.28); check N0UK logger EME-1 for me.
73, Ed - KL7UW
http://www.kl7uw.com
"Kits made by KL7UW"
Dubus Mag business:
dubususa(a)gmail.com
Hello all, Wx permitting , I plan to be QRV on 13cm this WE for the
DUBUS activity
Because of the different worldwide allocations, 13cm can be a little
"tricky"" The VK portion that I use is 2300-2302 Mhz ..
I will Tx around 2301.975 MHz as usual +/- QRM At all times. I
can receive on ALL sub-bands and this can make it difficult so here is
my proposed schedule..
Sat 28/2 0700 - 0830 z Listening for NA
2304.075 +/- my doppler
1030 - 1130 z Listening for JA
2424.075 +/- my doppler
1200 - 1530 z Listening for Eu (all) 2301.975 +/- 2304
.075 +/- 2320 .075 +/- my doppler
Sun 1/3 0730 - 0830 Listening for NA
As above
1130 - 1630 Listening for Eu
(all) As above
For those that haven't worked me before ( please look for me!!) If
you hear me on *.XXX MHz then please put your echoes on or near
the same spot in your sub band..i.e 2304.XXX, 2320.XXX. I will
be listening on the equivalent echo frequency in your sub band (+/-
1-2 KHz). It can be a challenge so please call for a while!!!
Hope to work many of you again and some new ones on 13cm..
GL all
Charlie
VK3NX
QF21CT
3.7m dish 120 W
Hi all
I got 2 of this Thomson 10Ghz TWT TH3639 but I dont have any info about it,
is there any one who have it up and run on 10Ghz ???...is it worth to play
whit ???
pse look here: http://oz1ct.dk/10ghz-twt-thomson.html
OZ1CT Bent
Hi EME'ers,
I will be QRV in both parts of the Februar 144MHz CW EME ATP starting
tomorrow afternoon and I look forward to have a lot of fun working "old"
and new friends.
I will be QRV:
28. Feb: 1330 - 1630 UTC.
28. Feb - 1. Mar: 2200 - 0100 UTC.
Good luck to all and see you via the moon.
Best 73, Jorgen OZ1HNE.
