Moon-net January 2015

moon-net@mailman.pe1itr.com

128 participants
142 discussions

by Pete M

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 -- ++++++CONFIDENTIALITY NOTICE++++++ The information in this email may be confidential and/or privileged. This email is intended to be reviewed by only the individual or organization named above. If you are not the intended recipient or an authorized representative of the intended recipient, you are hereby notified that any review, dissemination or copying of this email and its attachments, if any, or the information contained herein is prohibited. If you have received this email in error, please immediately notify the sender by return email and delete this email from your system.

6 months

Beko HLV-1200 SOLD.

by pa3fpq

Gents, The amplifier is sold. Johan PA3FPQ

3 years, 5 months

Doppler question

by Juan Antonio Fernandez

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

6 years, 9 months

Preamplifier and Bandpass filter for 144 MHz

by Dual

7 years, 2 months

QRV on 2m

by Edward R Cole

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

7 years, 9 months

23cm Amplifier

by John Sygo

Good Day. I wanted to thank all those that sent me Advice, Guidance and emails of support regarding my 2 x 23cm Amplifiers. There were just to many to answer individually. I learnt some very Valuable lessons in RF Principles and Grounding etc on 23cm. I have it working now with the full 300W Output. Many Thanks. 73 John ZS6JON --- This email has been checked for viruses by Avast antivirus software. http://www.avast.com

8 years, 3 months

432 and above EME Newsletter

by Peter Blair

Al Katz, K2UYH, will be working on the 432 and above EME Newsletter this week. Send your news, and any technical items, to him at alkatz(a)tcnj.edu Previous NL can be found at http://www.nitehawk.com/rasmit/em70cm.html ALSO.... a first reminder that January 31st-Feb1st is the DUBUS 144/ 432MHz CW/SSB contest. Rules are at http://www.marsport.org.uk/dubus/eme.htm Overlapping the 432 contest is the EME Newsletter SSB Funtest. If you’ve not tried SSB before on 432 MHz this is a good time to start, CW/SSB contacts count and will qualify for DUBUS as well. Further details and rules are at the above link in the January 2015 NL. 73, Peter G3LTF

8 years, 3 months

Re: [Moon-Net] Chinese 10MHz GPSDO anybody tried? Distribution amplifier

by w8zn54＠verizon.net

8 years, 4 months

Re: [Moon-Net] Chinese 10MHz GPSDO anybody tried? Distribution amplifier

by Edward R Cole

10-4 (assembled) = $75 10-4CK (full kit with enclosure) = $50 10-4K (board and parts, only)=$25 10-4PCB (board only) = $12 http://fwfvq.tehfm.servertrust.com/category-s/1833.htm they have a new website. I am using two of these. 73, Ed - KL7UW PS: 10-4 Steve has a sense of humor! At 07:52 AM 1/31/2015, w8zn54(a)verizon.net wrote: > Down East Microwave sells a 4 port distribution amp that I've used > several times and they work very well and is filtered. I think it's > their model 10-4. > ><http://www.downeastmicrowave.com>www.downeastmicrowave.com > >Terry Price >W8ZN - ex K8ISK/WD8ISK >1.8 MHZ - 47 GHz - FM18dv >Member of the K8GP Contest Group >FM19bb > >On 01/31/15, PA2V<peter(a)pa2v.com> wrote: > >Hi all. >No experience here with that GPSDO. >But some with Alibaba and alike companies. DON'T try them! >All junk and clutter. Better throw your money in the pond. >You might see some nice circles in the water, hi. > >When one need a cheap distribution amplifier look for a surplus or old >professional analogue video distribution amplifier. >I use a Grass Valley card. With some tweaking at the frequency response and >amplitude trimpots it gives a nice sinewave with decent level at 7 outputs >too. >It is normally a 75 Ohm in/output impedance but I did not bother that. It >works for me. >Other brands are Ampex, Sony (the prof. ones), BTS, Bosch, Philips and many >more. >Don't use the cheap consumer ones. They are not very good balanced and >output will vary with the number of connections. >The PAL versions have broader bandwidth than the NTSC versions. But I guess >the NTSC ones do the job too. >When someone need the desperately please drop me an e-mail. I have some >spare Grass Valley cards in the junkbox. >73, Peter PA2V > >_______________________________________________ >Moon-Net posting and subscription instructions are at ><http://www.nlsa.com/nets/moon-net-help.html>http://www.nlsa.com/nets/moon-net-help.html > >_______________________________________________ >Moon-Net posting and subscription instructions are at >http://www.nlsa.com/nets/moon-net-help.html 73, Ed - KL7UW http://www.kl7uw.com "Kits made by KL7UW" Dubus Mag business: dubususa(a)gmail.com

8 years, 4 months

OZ1HNE QRV DUBUS CW EME Contest,

by Jørgen Kristiansen

Hi EME'ers, I will be QRV on 144MHz this weekend in the DUBUS CW EME Contest, and I look forward to hear good activity and work "old" and new friends. Good luck to all. Best 73, Jorgen OZ1HNE.

8 years, 4 months

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Moon-net January 2015