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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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.
Anybody using a 144 mc LNA device called ALN0140WT ?
Specs look very interesting .. but are they for sale ???
73's Rick ,PA1BVM
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There was very nice CW activity during ARRL contest this year (on all bands except 2m from US) and it is unfortunate I did not have a lot of free time for it.
I also “worked” JT65 logger eme (I thought: who is going to find out anyway??) and apart from constant chatter I also found JAMMING.... a lot of Jamming, even from its own creator!!?
Check a small part of it from N0UK logger:
11/19 17:04 VE3KH you being jammed by K1JT and W6YX (W7IUV Larry WA DN07dg 220.127.116.11)
11/19 17:05 Why Larry .... they on 142 also? (VE3KH Kevin ON FN03aj 18.104.22.168)
11/19 17:06 They are calling me to get a contest poitn and it ain't gonna happen!! (W7IUV Larry WA DN07dg 22.214.171.124)
11/19 17:08 Thansk Larry 73 ... Yes, I have been jumped by a quite a few stations (VE3KH Kevin ON FN03aj 126.96.36.199)
11/20 17:47 Also hr k1jt calling me -22 but not ans him (KN4SM/5WL/KW Jerry VA FM16qt 188.8.131.52)
11/20 18:02 Contest = reduced courtesy! (K5DOG/2M Stevedog NM DM52xw 184.108.40.206)
11/20 18:04 Yes, K1JT and W3SZ can hear on gold tooth. (K5DOG/2M Stevedog NM DM52xw 220.127.116.11)
One thing I wouldn’t regret missing on EME is JAMMING!!!
GL 73, Petros SV3AAF
It has been a topic here about 3 to 4 weeks ago.
Despite all I bought the largest off those Rotator.
The Big RAS/HR
After I received it I did connect all the cable.
The rotator works fine. I can controll the rotator with MD-01 controll box.
Then we connected USB and all the sudden the elevation readout startet
on counting down.
Even when the rotator turned up it counted down.
Trying to find the problem. (Testing cables, connections etc)
all the sudden AZ is now also only counting up. left or right no diffrence.
As well the newly installed LAN modul is not working.
The programm is seen the controller but those not communicate with it.
Can someone give a hint where I should start looking for the fault.
Is the fault in the hall sensor or is it in the controll box
as there is not schematic available, I can not search for the fault.
And sending the rotator trough half off europe doesn't make sense either.
vy 73 de Michel
Thanks for your reply(s) Daniel et al. My Kuhne PA will go as high as 140W,
as per kuhne. Yes, I have been on JT65C listening. I did login to HB9Q
logger about 3-4 hours ago. The UTC time listed on the logs seemed to be 2
hours behind though so that was confusing. Can anyone tell me why?
I understand that next weekend Sunday should be good, so I will be QRV for
listening at least.
Thank you to all who responded for your support. I hope to make a real QSO
on EME soon. I also see via one of the EME planners that the ON0EME beacon
should be available to me next weekend, which will help confirm my receive
capabilities. I have a 24Y with the 27db gain LNA so I hope I have enough
sensitivity to hear the beacon and/or one of the big guns.
CN89tb on the west coast of Canada
I plan to be QRV on 23cm CW tomorrow from about 0600 probably on 1296.015 so if anyone wants a test or sked then please email. I have 6m dish +400W and receive side is pretty good, 0.4dB from Taurus and ~20dB sun noise. I have worked stations with 2.4m and 200W. I will be on the HB9Q logger.
73 Peter G3LTF
I think, from my experience, that the power
handling capabilities of type "N" center pins,
can be a bit underrated. When I was running hi
power(=> 2.5KW) on 2M EME I took risks and used
totally type "N" connectors. 7/16 DIN
connectors, either weren't out or not readily available then.
The only time that I lost a connector, was when I
was only running 500 W (single 4x150 PA). One
rainy night I had to climb my tower to replace a
rotor jumper cable, from which a center pin had
evaporated. I had neglected to fully tighten one
of the type N connectors. I made several
thousands of QSOs with N connectors, with no
other N failures. However I destroyed many
contacts in relays. I finely ended up using
mostly Dow Key DK-60 type relays. Their contacts
are almost the size of pennies, HI. Their
isolation at 144 MHz is inadequate, so an
additional low power coax relay, with good
isolation, had to be used ahead of the LNA.
With all this history and experience being
expressed, as I rebuild my new 2M EME array, I
will opt to use only 7/16 DIN connectors in the TX path.
BTW, does anyone know of a source of hi power
relays that utilize 7/16 DIN connectors, or of HC(m) to 7/16 DIN(f) adaptors ??
At 12:35 AM 8/13/2013, Edward R Cole wrote:
>Yes, certainly the center pin of the N-connector
>is weak point where too much RF current passes
>for its design. In my initial set up of the
>8877 amp I did not have long enough cable from
>the amp to the Bird43 meter so I ran two
>sections of cable. I had an N-connector failure
>that literally burned up the center-pin and
>conductor where I spliced the two cables with a
>N barrel. When I removed the cable I discovered
>I used a section of RG-213 to a section of
>LMR-400. The total run is about 20-feet around
>three sides of the room. I was dissipating
>about 100w in the two cables. Connectors were
>definitely pretty warm. under load.
>I ran the amp at 600w for about two years due to
>limitations of the HVPS so this weak point in
>the cable escaped initial notice. It was when I
>got a 3000v 1amp supply to run higher power that this showed up.
>I now have a single run of LMR-600 in the place
>of those two cables. Of course the highest
>power level exists right at the amp output so
>this 20-foot run is exposed to 1400w. I've had
>no further issues with connector heating since
>replacing the cable. I have a drop of 70w in
>that cable, but the N-connectors at the amp and
>meter are barely warm under JT65 operation.
>Another short run of LMR-600 thru the wall to
>the 110-foot 1-5/8 Heliax run to the base of the
>tower, then 45-foot of LMR-600 up to the
>CX-600NL on the tower. It connects to a DowKey
>400 relay for polarization selection and two
>NARDA relays for TR (one on each pol). I
>measure about 0.15 dB loss thru the whole relay
>matrix. The NARDA are about 0.05 dB and too
>little to really measure with a power
>meter. The CX-600 is used to switch from 2m-eme
>to a 1296 antenna for terrestrial use, so it is
>switched very rarely (default is to 2m).
>I do run LMR-400 past my elevation axis to the
>4-way dividers but the power level has dropped
>down to 1015w at that point. Final power to the
>antenna connections is 950w but of course each
>phasing wire carries 1/4 the power to each of the antennas.
>I would guess most begin with N-connector
>components. What I am hearing, which fits with
>my own experience, is all relays are not
>equal. The Tohtsu are on the lower end. My
>relay failure was at the relay contacts and not
>the connectors. Apparently its well known that
>contact alignment is not that good for this
>model relay. I discovered one of the other
>relays had contacts that did not meet
>properly. Its relegated to low power use
>(actually not in use, presently). The other two
>were good and one is in use while the other is
>in the shack for future use on 6m at 800w.
>73, Ed - KL7UW
>At 07:16 PM 8/12/2013, Brian, WA1ZMS wrote:
>>Let me please add my input here ..
>>Relay isolation aside, the limiting factor for
>>QRO is that of the N-connector.
>>In particular the center pin. This is where
>>7/16 DIN connectors are superior.
>>The relay failures I have seen have been from
>>over-heating of the center pins.
>>A ½ Heliax or SuperFlex coax jumper can help remove heat from the center
>>pin much better than a jumper made from RG-213.
>>My day-job experience & hobby has taught me
>>that heating of the center pin is the
>>first limiting factor when using Type
>>N-connectors. Refer to the Dow Key data sheets
>>for an example. If you include SWR, then you
>>*MUST* de-rate the relay by 80 to 90%.
>>For these various reasons, I think this is why
>>one user may have had good experiences
>>with a given brand or style of relay, while
>>others have had nothing but failures.
>>Just my 2 cents after building several 2m QRO SSPAs in the past few years.
>>Moon-Net posting and subscription instructions
>>are at http://www.nlsa.com/nets/moon-net-help.html
>73, Ed - KL7UW
>"Kits made by KL7UW"
>Moon-Net posting and subscription instructions
>are at http://www.nlsa.com/nets/moon-net-help.html