Moon-net July 2021

moon-net@mailman.pe1itr.com

88 participants
97 discussions

by Serge Szpilfogel

Congratulations to all my Italian friends on winning the cup. I was disappointed not seeing France in the final Best regards to all Serge VE1KG

1 year, 10 months

Help putting a signal on the moon for testing (1296 Mhz)

by Alejandro Faundez

Hello everyone I am Alejandro CE3VRT and I recently got started at 23cm EME here in Chile, i was QRV in the 2020 ARRL EME contest and managed to do some nice QSOs with some friends from here :). After the new year I had to take out my dish for paint because it was rusting, and I ended rebuilding the whole tracking mount, to accommodate a new and stronger linear actuator because the old one broke. I'm finally almost done to get QRV again, this weekend (June 10-11) the Moon it's on the Sun, but I plan to mount everything again and do some sun noise measurements, fine focus adjust, etc. I plan to get QRV on the June 17-18 weekend, but i also need to test some new LNA's that i got, i know that the ON0EME beacon it's offline, so i'm asking if someone can help me putting a signal on the moon (a carrier and/or JT65C) to the test the LNA's. My station it's small, only 1.8m solid dish with septum feed, so I think I need a moderately strong signal to copy. At the moment I have 50w at the dish, it's not much, but we can try some QSO's also! Many thanks! Alejandro CE3VRT

1 year, 10 months

70 cm portable EME station

by G Richard Kreuter

Tom Mission aborted as we have a TX protwith the sequencer and no real experience with JT65 or Q65 Richard Joe WA8OGS and I will be QRV tomorrow morning at moonrise in Cincinnati. We set up today in the drizzle at the Voice Of America. We have a 2x2 array of 15 element LFA Yagi’s and 600 watts We will be listening first on Q65-60B and then try an echo test. This is our first try with our portable 70 cm EME station. Richard WC8RK Note new EMail “gkreute(a)gmail.xn--com-9o0a

1 year, 10 months

Re: [Moon-Net] 144/222 EME and GS35b questions

by mike＠kl6m.com

I have a GS35B in my 70cm amp that I built in 2003. I built this amp and power supply in less than a week. I built in NO safe guards, such as a fan interlock. At least a dozen times I have forgotten to turn on the fan until I suddenly smelled smoke and then I quickly turned it on. OUCH! I have been beating this amplifier without mercy for almost 18 years and it still outputs 1500 watts with 100 watts drive with the ORIGINAL tube. So I definitely LOVE the GS35B. It draws about 1 Amp at 3300 volts key down. But because of the torture I have dealt to this amp, I have periodically had to increase the bias to keep the idle current reasonable. I need to do that again because right now the tube idles at 300 mA. So when I operate 70cm, I do not need to worry about getting cold in my shack. Just idling the amp is outputting about 1000 watts of HEAT. If you want more information on my highly successful GS35B amplifier, look here: https://ptt-ak.com/kl6m/gs35b/GS35B.html It is not very pretty, but it has served me very well (almost 300 CW initials on 70cm EME). 73 Mike, KL6M BP51dc http://kl6m.com/ Moon-net > >> <moon-net(a)mailman.pe1itr.com> ha scritto: > >> > >> > >> Hi all, > >> > >> In the coming days I hope to try Q65 on 144 and maybe 222 MHz EME. On > >> 144 I have 1300 watts and a 13 element Yagi. On 222 I have 800 watts and > >> a 22 element Yagi. I cannot elevate either antenna. > >> > >> By the way if any big station would like to try CW, let's go! > >> > >> I have 40 elements on 432 but unfortunately no amplifier. I don't think > >> 25 watts will do much! > >> > >> > >> > >> I have two questions relating to a GS35b amplifier on 144 MHz. 99% of my > >> amplifier experience has been with tetrodes. I do not well understand > >> triodes. I know I have plenty of power but something has changed with > >> the amplifier and I am not sure I understand it. > >> > >> What is the proper method to adjust the output coupling? I have adjusted > >> for best efficiency. That also seems to give maximum RF output. > >> > >> What change in operating parameters should be expected when a GS35b tube > >> is getting weak? I guess that is what is going on but I would like to > >> confirm that before I try another tube. Long story but some work is > >> involved to change tubes. > >> > >> When I got this amplifier about 4 years ago it would make 1700 watts > >> output with about 70 watts drive, 3.8 kV on the anode (into a dummy load > >> of course). I do not remember the grid or anode current but I remember > >> efficiency was better than 60%. > >> > >> The best I can do now is 1300 watts output, 500 mA at 3.9 kV, 65 watts > >> drive, grid current 250 mA. If I increase drive, grid current goes up, > >> anode current maybe goes up a little but I don't get any more output. > >> > >> If I increase the output coupling capacitance (move closer to the anode > >> line) I can get anode current up to 900 mA but then efficiency is very > >> poor and I have only 1000 watts output. This is the part that makes me > >> question if it is really a weak tube. I know it will draw more anode > >> current, but then efficiency is terrible. > >> > >> 73, > >> Paul N1BUG > >> FN55mf > >> _______________________________________________ > >> 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 > > > > > > _______________________________________________ > Moon-Net posting and subscription instructions are at http://www.nlsa.com/nets/moon-net-help.html<hr>_______________________________________________ > Moon-Net posting and subscription instructions are at http://www.nlsa.com/nets/moon-net-help.html

1 year, 10 months

144/222 EME and GS35b questions

by N1BUG

Hi all, In the coming days I hope to try Q65 on 144 and maybe 222 MHz EME. On 144 I have 1300 watts and a 13 element Yagi. On 222 I have 800 watts and a 22 element Yagi. I cannot elevate either antenna. By the way if any big station would like to try CW, let's go! I have 40 elements on 432 but unfortunately no amplifier. I don't think 25 watts will do much! I have two questions relating to a GS35b amplifier on 144 MHz. 99% of my amplifier experience has been with tetrodes. I do not well understand triodes. I know I have plenty of power but something has changed with the amplifier and I am not sure I understand it. What is the proper method to adjust the output coupling? I have adjusted for best efficiency. That also seems to give maximum RF output. What change in operating parameters should be expected when a GS35b tube is getting weak? I guess that is what is going on but I would like to confirm that before I try another tube. Long story but some work is involved to change tubes. When I got this amplifier about 4 years ago it would make 1700 watts output with about 70 watts drive, 3.8 kV on the anode (into a dummy load of course). I do not remember the grid or anode current but I remember efficiency was better than 60%. The best I can do now is 1300 watts output, 500 mA at 3.9 kV, 65 watts drive, grid current 250 mA. If I increase drive, grid current goes up, anode current maybe goes up a little but I don't get any more output. If I increase the output coupling capacitance (move closer to the anode line) I can get anode current up to 900 mA but then efficiency is very poor and I have only 1000 watts output. This is the part that makes me question if it is really a weak tube. I know it will draw more anode current, but then efficiency is terrible. 73, Paul N1BUG FN55mf

1 year, 10 months

WIDE GRAPH FOR JT65B & Q65A

by ve1kg＠eastlink.ca

Hi! Folks I am using the same settings on the wide graph for both modes. I wonder if that is correct?? Many times I decode stations which I do not see on the wide graph when using Q65A. How do I increase the wide graph sensitivity when using Q65A?? I have no issues when using JT65B. I only wish everyone would use Q65A or JT65B on 144 EME. I spend my time switching back & fourth modes & often forget the changes in the configuration for the mode I am using. Any suggestions will be welcome Serge VE1KG

1 year, 10 months

reducing static rain noise on antennas

by pa4vhf

Hello all, Technical question about static rain. I wonder if the mechanical construction of an yagi has influence on the impact of static rain. Is it possible to reduce static rain noise by choosing a certain type of antenna? I can imagine a low or high impedance yagi makes some difference, or grounding or isolating dipole and/or elements? Perhaps certain antennas are known to be very sensitve to static rain, others not. Any suggestions? 73 Dick, PA4VHF

1 year, 10 months

Re: [Moon-Net] [VHF-Expeditions] #technical bag for carry antennas or tripd

by Serge Szpilfogel

Erwin I am taking a 12 El to Cuba hopefully next spring with other stuff I have a golf bag for it. I left the antenna in the box for more protection Serge VE1KG -----Original Message----- From: VHF-Expeditions(a)groups.io <VHF-Expeditions(a)groups.io> On Behalf Of DK5EW, wini via groups.io Sent: Friday, July 09, 2021 07:06 To: VHF-Expeditions(a)groups.io Subject: [VHF-Expeditions] #technical bag for carry antennas or tripd Hey guys, what kind of bags you use for carrying the aluminium - antennas - tripod ? I`m think of a skiing or fishing bag ? Most airlines accept sportsbag f.e. British Airways up to 190cm. 73`s Erwin/DK5EW _._,_._,_ ________________________________ Groups.io Links: You receive all messages sent to this group. View/Reply Online (#8) <https://groups.io/g/VHF-Expeditions/message/8> | Reply To Group <mailto:VHF-Expeditions@groups.io?subject=Re:%20%5BVHF-Expeditions%5D%20%23technical%20bag%20for%20carry%20antennas%20or%20tripd> | Reply To Sender <mailto:erwin.witt@mailbox.org?subject=Private:%20Re:%20%5BVHF-Expeditions%5D%20%23technical%20bag%20for%20carry%20antennas%20or%20tripd> | Mute This Topic <https://groups.io/mt/84086556/391226> | New Topic <https://groups.io/g/VHF-Expeditions/post> Mute #technical <https://groups.io/g/VHF-Expeditions/mutehashtag/technical> Your Subscription <https://groups.io/g/VHF-Expeditions/editsub/391226> | Contact Group Owner <mailto:VHF-Expeditions+owner@groups.io> | Unsubscribe <https://groups.io/g/VHF-Expeditions/leave/10419941/391226/2058443086/xyzzy> [ve1kg(a)eastlink.ca] _._,_._,_

1 year, 10 months

Re: [Moon-Net] [test-equip-trader] … and fets

by PeteM

> I have for sale… to be used to repair my preamps. > > Some of my preamp fets… NE334S01 PHEMPT FET. 10/$75 shipped CONUS… ONLY > 150 available at this time. These are REAL NEC… NOT CHINESE FAKES. > > Pete wa2odo > > _._,_._,_ > >

1 year, 10 months

Fwd: [test-equip-trader] 10GHz Eval board.

by PeteM

Includes full printed data sheets For sale… 1 each… TGA4956 eval Board, 9.9 to 12.5GHz, 32dB gain, 3v to 7v, apx 1w with edge mount 2.92mm launch conn mounted. $125 shipped CONUS Pete wa2odo

1 year, 10 months

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Moon-net July 2021