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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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 18.104.22.168)
11/19 17:05 Why Larry .... they on 142 also? (VE3KH Kevin ON FN03aj 22.214.171.124)
11/19 17:06 They are calling me to get a contest poitn and it ain't gonna happen!! (W7IUV Larry WA DN07dg 126.96.36.199)
11/19 17:08 Thansk Larry 73 ... Yes, I have been jumped by a quite a few stations (VE3KH Kevin ON FN03aj 188.8.131.52)
11/20 17:47 Also hr k1jt calling me -22 but not ans him (KN4SM/5WL/KW Jerry VA FM16qt 184.108.40.206)
11/20 18:02 Contest = reduced courtesy! (K5DOG/2M Stevedog NM DM52xw 220.127.116.11)
11/20 18:04 Yes, K1JT and W3SZ can hear on gold tooth. (K5DOG/2M Stevedog NM DM52xw 18.104.22.168)
One thing I wouldn’t regret missing on EME is JAMMING!!!
GL 73, Petros SV3AAF
Where could I find any article or document about how I must handle the
Doppler issue when we are working moonbounce?
When I see in the WSJT software that doppler is +1KHz and my partner
see -1 KHz, if we sked in 432.066, Which frequency should we choose to
TX and RX? Which is the current rule or agreement?
I am aware that if all of us had a SDR recevier with a 90KHz
waterfall, we will not be worried about doppler, but to make a contact
where we can´t ear our partner it is very difficult. To hit the
target is our best weapon.
Sri for this beginner question.
Some time ago there were a lot of Ericsson couplers floating around (model KRF 111 063/1). Has anybody used one? Should be straightforward enough to experiment with, but would be interested to know if anybody is using one on 432MHz.
Thanks everyone for the good advice.
I have purchased a DowKey 412 transfer switch for the job. I'm sure it'll
be a long term valuable bit of kit for EME. I'll keep the signal paths out
to the antenna array totally separate for RX and TX so only the one transfer
switch is required.
73's Peter VK4JD