Moon-net May 2015

moon-net@mailman.pe1itr.com

130 participants
171 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

2m EME items for sale

by james1787＠aol.com

Hello folks,? As my 23cm project is underway, I no longer need the 2m EME stuff I used when I was QRV back in 2012. I don't have any plans to return to 2m EME anytime soon as I don't have the room at my house for long yagis. ? With that, I have decided to sell my 2m?EME components to make some room. ? Here is what I have for sale: W6PO design 8877 2m RF deck w/8877 tube, homebrew (not by me), $1000 OBO - Pics available upon request. This works nicely, I used it in 2012 for all of my JT65 & CW EME QSO's. Rack & Power supply is NOT for sale (power supply & rack?is?not mine to sell, owner not interested in selling) DEMI L144LNACK-2N GaAs pHEMT pre amp., 17dBG, <0.5DBNF, RX only!, $40 - I built this as a kit YU7EF design 9 el yagis (built by me) - quantity of 4, these break down each into 3 sections, with LMR-400 phasing cables (n connectors). All are lightweight contruction. $250 OBO for all four - pickup only M2 4 port power divider for 2m (n connectors)?- $100 ? I will sell the yagis and M2 4 port divider together for $300. The yagis are the only thing I won't ship. I would prefer local pickup on the amp to ensure it's safety but I'll ship (I drove to Virginia to pick it up!) ??????? 73, James KB2FCV ? ??

7 years, 8 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

3 Meter Parabolic Dish Kit For Sale

by Fabrizio Folcarelli

Hi Lunatic!! i heve : 3 meter Dish Reflector Kit. 307 CM DIAMETER F/D RATIO 0.4 The Kit includes: 16 Ribs pre-assembled 8 Angular reinforcement structure 1 Central Drum 1 Attack must (dia. 45 mm approx. – innocents-) 5 Tube Ø 16 mm shaped for the circumference. All the necessary mounting hardware (all INOX)Photo-mounting instructions All parts are numbered and the entire structure is easily assembled. For mounting serve three keys: 10, 13 and 8. The whole structure is made of anodized aluminium avio anti-corodal. All hardware is STAINLESS steel. The weight should be around 20/30 Kg (a person can hold it alone) Once assembled it remains only to apply a mesh (not included in Kit) which vest more befitting to the frequency on which will be working the parable, keeping in mind that we can say that the length of the side of the mesh shall be at least one-tenth of the wavelength of the lowest frequency (example. 1296 MHz wavelength at least 23 cm knit 2,3 cm). A good compromise may be from 1.2 cm that is what I have installed on my parable, who works on 432 MHz 1296 and 2320 with excellent results. The price is 800.00 euro (excluding shipping costs) is not negotiable, taking into account the type of materials used and the workmanship, and also taking into account that a German firm producing a specimen like this and wants to € 1400.00!!!! Just for news I built many kits from this parable and I personally tried with great satisfaction via Tropo 432-1296-2320 MHz and 1296 Mhz EME, representing that every subsequent construction are applied to minor improvements. On request I can provide support for elevation, support for feed (depending on what you decide to use) and feed. On request sending other photos via email. Anyway almost identical to this: http://digilander.libero.it/iz0cls/ Or watch this video: https://www.youtube.com/watch?v=Fxqs7mtuT-A If you or someone of your friend is interested Contact to: fabrizio.iz0cls(a)gmail.com or iz0cls(a)libero.it

7 years, 10 months

432 and above EME NL

by Peter Blair

Al Katz, K2UYH, will be working on the 432 and above EME Newsletter this weekend. Send your news, especially about recent contest activity, and any technical items, to him at alkatz(a)tcnj.edu Previous NL can be found at http://www.nitehawk.com/rasmit/em70cm.html 73, Peter G3LTF

7 years, 11 months

Partial eclipse tomorrow

by peter blair

If at all possible try and make an accurate measurement of sun noise during the eclipse period on what ever band you can. Ideally we are looking for the ratio between normal level (measured on the same day) and the minimum sun noise occurring at the time of maximum shadowing. You can get the timing for your exact location from this link. http://eclipse.gsfc.nasa.gov/SEgoogle/SEgoogle2001/SE2015Mar20Tgoogle.html We believe that we can possibly accumulate some interesting measurements on a non-quiet sun which might indicate how much noise comes from the corona compared to the disc. This influences what value is used for the solar diameter when making beamwidth measurements for example. GL 73 Peter G3LTF

7 years, 11 months

Spreadsheet with a complete listing of QRO 23CM SSB, CW, JT ( or other, band/mode combination) moonbounce station equipment

by Patrick Barthelow

Hello Folks: I am writing a grant proposal to establish/build a moonbounce station at a University, for educational use. I have been around a few, and studied them, helped assemble them, but never had to build/order a complete set of parts/component/systems for a complete station. I never, until now, had the opportunity to find a grant provider that could accept, judge, and hopefully fulfill a grant proposal to build an EME station. If successful, I am happy to share what I have learned, with others who may wish to build EME stations at schools, clubs or other organizations. I wonder if any of you have made a spreadsheet, perhaps for insurance purposes, etc, with a full listing of of all components to your station, with vendor contact info, pricing, etc. I am thinking of a QRO station 23cm, CW, SSB, JT-65, to an existing large parabolic dish, but any station combination, of any band and mode, would be useful. to develop my listing on this grant proposal. Block diagram drawings of your station would also be helpful. Include if you can, a desirable minumum, medium, or gold standard selection of EME station test equipment for commissioning, testing and ongoing long term maintenance/repair. In fact, such a spreadsheet covering a variety of station examples would probably be useful to any of us newbies. Maybe a published collection of Moon-Net subscribers' EME station listings in a spreadsheet format would be helpful to anyone putting a new station together, (or Grant proposals together) who would otherwise be starting the daunting task, with a clean spreadsheet file.. If you have one that you are willing/able send to me, send to my e-mail, off line to my email address below. If you think a publicly accessible listing of a variety of complete, proven, set of EME station components would be useful, choose a web location, let everyone know and let any who wish, post them. If one thinks security of such a listed collection of high value equipment a listing, or location of high value equipment might be an issue, I, or whoever collates, develops, or publishes such lists can make the owners' names and locations completely anonymous. Thanks, Best, 73 Pat AA6EG apol <apolloeme(a)gmail.com>loeme(a)gmail.com

8 years

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Moon-net May 2015