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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I’m ready on 6cm with the same dish I’m using on 3cm.
Despite the strong local 5 GHz WiFi noise, had a nice 579/569 first QSO with this setup today with HB9Q, thank you Dan !
Setup is a 3.7m dish and 60W at CP feeder.
I can be QRV on 6cm or 3cm most of the days, skeds and tests are very welcome, as usual.
qrv 70cm, 33cm, 23cm, 13cm, 9cm, 6cm and 3cm.
For 10Ghz only one preamp is available and we will close further production after delivering more then 100 pcs.
We expect a crowed band in the coming time,hi.
We are currently preparingthe first batch of a super LNA for 24Ghz with NF: 1.1dB
Furthemore we would like feedback for the design and production of an 24Ghz SSPA.
Design goal is: 10Watt rf out, Vdc: 15Vd and WG connections.We will design against a reasonable price but need your feedback.
Thanks in advance,
I seek to add a camera to the center of my EME array to know when it¹s
on/off the moon.
1. wired camera (not wireless nor Bluetooth),
2. CCTV type is OK if available
3. All weather capable 20 deg F through 110 deg. F
4. Reliable all the time
5. Monochromatic or color (either one) is OK
I recall there was some detail about viewing the moon that a certain focal
length (lens) is best and I¹d welcome (please) camera recommendations
What specific camera manufacturer and model do you recommend?
What specific monitor (manufacturer and model) recommended?
What cable type is required? (impedance, number of conductors and gauge
for 150 foot or 48 meter length)
Thank you; very 73,
I invite you to send your log will be appreciated, also with only one
qso, end-time Monday June 18th.All format areaccepted, better if xls.
Best 73'sde EnricoI5WBE
A.R.I. - EME Manager Coordinator
I am almost done with firmware for MABMPU simple controller. This is a potential replacement for DRO levels that can be expanded in the future to work with various popular EME trackers like RazTrak, DrzTrack, OE5JFL, F1EHN.
In order to use this setup, one MABMPU encoder board takes on role of the controller and reads the US Digital SEI bus encoders and displays the results on the LCD. This simple controller works with US Digital A2 and A2T encoders or MABMPU encoder board (using MAB25, MAB28, ETS25 or MPU9150 inclinometer).
Power (+12VDC) is provided to the encoders over the 6-wire CAT-3 cable from the MABMPU simple controller. In theory, the US Digital SEI bus can drive cables over 100m.
For those that already have a EME tracker which utilizes US Digital encoders, I have a version of the MABMPU LCD firmware that monitors the SEI encoder bus for encoder read position commands and simply displays the positions on the LCD display. In this configuration, the power to the MABMPU monitor is obtained from the SEI 6-wire bus.
Call for Papers and Presentations for the second Super VHF Conference,
April 26-28, 2019, in Sterling, VA, near Washington, DC.
The the second Super VHF Conference is jointly sponsored by Packrats, NEWS
Group, and SVHFS, and Hosted by the Grid Pirates Contest Group and
Directive Systems and Engineering
details at http://vhfsuperconference.com/
Presentations or papers are welcome on VHF, UHF, microwaves, and higher.
All aspects welcome, technical and non-technical - operating, contesting,
homebrewing, roving, software, EME, surplus, antennas, test equipment,
amplifiers, SDR, 47 GHz superregen, whatever. Your winter project might be
a good candidate - take some pictures.
N2CEI and W1GHZ will be coordinating the proceedings book and CD.
submissions and questions to:
Robin Midgett K4IDC
I have several N type failsafe relays, typically made by Ducommon, RLC,
etc. that cause noise on receive.
I think this is caused by oxidation on the contacts, although I assume
are gold plated. Maybe the plating is fatally damaged already?
I have tried running ~100 ma through the contacts while switching them
rapidly without much effect.
By disassembly, I could apply the typical burnishing tool or "business
card" stock but don't know if that would do more damage than good. Is
"deoxit" completely out of the question for a high power relay? What
methods should I absolutely avoid?
Any suggestions on these or other methods would be appreciated. Also
looking for suggestions on testing them after "treatment". I am
thinking that using a NF meter would be a good test method, but I would
like to hear other ideas.