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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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
I have a Beko 950 6m amp with a problem. It is the output relay. I
plan to replace it myself. However, I would like to know more about it
and have not been able to find a schematic for this unit. In
particular, I have smoked a resistor that is connected to the RX input
side of the output T/R relay, apparently it is the preamp power input.
I think maybe I had tried to TX with too much power when in bypass mode
and took out this resistor. It is connected to the center pin of the NC
side of the output T/R relay. I can probably just leave it out as I do
not power a preamp thru the coax but would like to know what the proper
value is as it is burned beyond recognition other than that it's a
resistor and the first band is brown!
I am also considering replacing the relay used, Tohtsu CX531, with a
more robust power handling relay as this one seems quite under spec'd to
me (and others on the 'net).
This amp has been fine for several years in service for me at W4ZST and
with the Fourlanders Contest group W4NH, both here and portable. No
I have tried contacting Island Amplifier but have had no response.
Any advice or helpful comments appreciated. Thanks and 73, Bob W4ZST
I recently read a comment from you about working WSJT on CW.
I assume that I would only use the doppler correction for my "DX echo", "my
Echo" or "CFOM" equipment, that would be fantastic!!
Let me know if I'm right and please a guide on how to configure WSJT-x for
this type of work.
What is the calling frequency on 10GHz for Q65? Which sub mode does
everyone use? and is it typical to use CFOM ?
I would like to setup my terrestrial system (60cm PF dish) to tracking
during moonrise and moon set for the next few days to see if I can decode
any signals during this period of low degradation.
Any help appreciated.
73 de Peter
Please take into account another issue for 10Ghz EME.
Due to the spreading the cw tone will be wider and more “noisy” thus then it is more convient to use a SSB filter to copy this signal rather then using a cw-filter.
Most likely you will not be able to decode it through the CW filter at all.
For those who have experience in Aurora signals will know this phenomen.
Br. Jan PAoPLY
Verstuurd vanaf: myMail voor iOS
Following Charlie's comments about frequency setting and a 50Hz offset .
Andy G4JNT reported doing many measurements of the downlink frequency of
QO100 and finding a similar offset in frequency .
It was concluded that the remaining offset , when all system components
were optimised /locked , was down to the synth used in most LNBs and even
with a GPS or Rubidium reference , this could not be removed .We just have
to live with it or use a different RX architecture .
On Fri, 30 Sept 2022 at 11:02, <moon-net-request(a)mailman.pe1itr.com> wrote:
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> Today's Topics:
> 1. Re: 10GHz Q65 (Charles)
> 2. Re: 10GHz Q65 (Bob Atkins)
> 3. Re: 10GHz Q65 (Paul N1BUG FN55mf)
> Message: 1
> Date: Fri, 30 Sep 2022 06:02:23 +0200
> From: Charles <g3wdg(a)moon-net.eu>
> To: moon-net(a)mailman.pe1itr.com
> Subject: Re: [Moon-Net] 10GHz Q65
> Message-ID: <c9e9cdc0-b0ac-fd59-0789-7524f8425ab3(a)moon-net.eu>
> Content-Type: text/plain; charset="utf-8"; Format="flowed"
> Hi Peter
> Yes, CFOM is the standard Doppler method on 10GHz, for normal operating.
> To receive the beacon however, you need to select 'Full Doppler to DX
> Grid' or 'On Dx Echo'.? The beacon itself is on a fixed transmit
> frequency.? Make sure you have DL0SHF entered as the DX station and
> JO54CG as its grid locator.? This is needed so that the correct Doppler
> offsets can be applied by WSJT-X, and also allows more sensitive decoding.
> If your system is all GPS locked the beacon will appear at about 1050Hz.
> For some receivers, performance will be better if you set the beacon to
> appear at about 700Hz, so tune not to 10368.024, but to 10368.0243 and
> look for the beacon at about 750Hz.
> We don't know why the beacon appears 50Hz high.? Its not something to do
> with WSJT-X Doppler calculations.
> Charlie DL3WDG
> On 30/09/2022 05:37, VA3ELE Peter via Moon-net wrote:
> > Thanks for the input Bob. I was actually just on your site reading
> > about sun/cold sky measurements. I'm hoping in the next short while to
> > test with my portable dish.
> > 73 de Peter
> > VA3ELE FN03dm
> > On Thu., Sep. 29, 2022, 10:32 p.m. Bob Atkins, <ka1gt(a)hotmail.com>
> > Peter
> > By far your best bet will be to look for the beacon, DL0SHF. If
> > you tune to 024 you should see the Q65-60*_E_* sync trace at
> > 1000Hz during the even minutes. FSK CW on the odd minutes. If you
> > can't see it (when it is on - see below), it's very unlikely you
> > will copy anything else (there are a couple of stations who are
> > louder, but only a couple).
> > Almost everyone else will be using 60D for some reason. E is often
> > better, but isn't used much. There isn't really a much-used
> > calling frequency. People do use .200 but stations my be calling
> > CQ anywhere between .100 and .200.
> > *_NOTE that D0SHF is not on when the moon is at low
> > declination_**. *?It's off when declination drops below -15
> > degrees (like it is now). It won't come back on before late next
> > week. Maybe around the the 7^th ?it will be back on (DGRD ~
> > 0.7dB). Don't go chasing it when it isn't on! Occasionally it's
> > not on when it's supposed to be on, which can lead to some
> > frustration and confusion (like wondering what you have done wrong
> > or what part of your Rx system has broken...). There is a status
> > page you can check, but even that can say it's on when it's not. I
> > think the status page might give correct info on the Tx state, but
> > it doesn't show when they are having tracking issues, so it may
> > occasionally be on, but not pointing at the moon.
> > See http://www.bobatkins.com/radio/DL0SHF_10GHZ_beacon.html
> > You may be able to detect the beacon at moonrise, but if you have
> > no elevation control, ground noise may make that quite difficult
> > with a small dish. If you really want to see it you are probably
> > going to need some elevation so you get rid of ground noise.
> > Good Luck
> > 73,
> > Bob, KA1GT
> > _______________________________________________
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