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
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.
Grant
VE6TA
DO33gs
While I have no man made noise, in the last 2 weeks I noticed my Smeter going from barely S1 to S3 to S4. The culprit is my main computer. When turned off no problem. So what can I do about it??? will grounding the computer help?? This seriously affect my reception. My 10 years old laptop does not interfere or generate noise on the receiver. The main computer is window 7 & I guess the power supply may be the problem but I really do not know. Any suggestion would be helpful
Serge VE1KG
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.
73
Jimmy SV1BTR
2m: 16*6el xpol
70&23cm: 6.1m dishes
I have decided to get PE1RKI to make me a similar coupler with 7/16
connectors so I have decided to sell the a dual directional coupler. I
am asking £140 GBP + shipping which is £10 EU and £14 USA.
Photos are here:
https://www.flickr.com/photos/pe1rki/8601582168/in/set-72157631581406613http://www.g4nok.org/wp-contenT1234/uploads/20130503_161644.jpg
Specifications are as follows.
Connectors: N Male and N female:
Forward and reflected ports SMA:
Specifications measured by PE1RKI and confirmed by me using an Agilent
E5071C ENA.
6m-13cm 1kw directional coupler
50 MHz to 2320 MHz
forward and reflected port symmetrical.
50 MHz 50db coupling 30db directivity
70 MHz 47db coupling 30db directivity
100 MHz 45db coupling 30db directivity
144 MHz 42db coupling 30db directivity
200 MHz 38db coupling 30db directivity
430 MHz 32db coupling 30db directivity
900 MHz 28db coupling 30db directivity
1300 MHz 27db coupling 29db directivity
2320 MHz 34db coupling 28db directivity
3400 MHz 26db coupling 15db directivity
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73
Conrad G0RUZ IO93FR
North Wakefield Radio Club
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Today it was flee market day on my road & I picked up a bran new satellite dish with feed horn & preamp. This is an offset dish which I would like to use to receive DL0SFH beacon on 10ghz It is an odd shape 1M wide & 75 CM high so my question is. Is it a 1M dish or a 75cm dish??? Also the LNB on the feed horn as only one input type F connector. So would the polarization be horizontal or vertical??? I assume this dish is for North America.So do I change the polarization by changing the voltage on the LNB??? Which polarization is needed to receive DL0SFH since I am in NA?? or it does not matter or do I need circular polarization?? I will be using a funcube dongle after the LNB followed by a software program like HDSDR or SDRSHARP or Spectravue.
Now does anyone know the IF frequency from these Satellite LNB?? I believe they are around 950mghz or 975mghz but I am not sure.
Thank you for your help
Serge VE1KG
