Moon-net June 2011

moon-net@mailman.pe1itr.com

114 participants
136 discussions

Fwd: [Moon] Regarding SK6OSO on 5760 MHz; Status as of June 27, 2011

by Ingolf, SM6FHZ

For you that do not have the "moon" reflector, some info on SK6OSO on 6 cm EME. 73 / Ingolf, SM6FHZ ---------- Forwarded message ---------- From: Ulf Kylenfall <ulf_r_k(a)yahoo.com> Date: 2011/6/27 Subject: [Moon] Regarding SK6OSO on 5760 MHz; Status as of June 27, 2011 To: "moon(a)moonbounce.info" <moon(a)moonbounce.info> Gentlemen. The status for our planned activity is as follows: 1. == Previously, the geometry of the dish and its support components has been checked using laser test equipment. After making some calculations, it was decided to move the sub-reflector 100 mm closer to the main reflector. The work is planned for this week. As of today, SEFD- measurements "Before" are taking place on 5 GHz. After the move, we have to repeat the tests. Possibly also on L-band (1300-1800 MHz). Each test takes at least 6 hours after which the engineer on duty (that is normally undersigned) will go up and change the feeder. I cannot say if the tests will complete before the end of the week. 2. == Last time (summer of 2009), it was discovered that the pointing tables used for the moon was incorrect. The table was once implemented because of EME-experiments, but after a major software upgrade, the table was never verified. Eventually, I had to make the pointing manually througout the entire week-end (with some help from visiting amateurs). There were corrections made to the table and the software in the fall of 2009, but they were not checked. When we tested the moon pointing today, we got an error message indicating that the table used was still incorrect. I have asked my collegue to attend to this problem, but since it is a personal request I have no authority to speed things up. I have however decided that it is not acceptable to have to control the antenna manually in the same fashion that was done 2009. We hit a considerably smaller area of the moon on 5760, and I also want some action by the RF equipment this time. And: The EME activity envolves not only myself, but also some of my collegues that has promised their support. It also requires that there are no other experiments running on the other 20M dish. It can also happend that there is a TOO (Target of Opportunity) = Discovered phenomenon that needs to be investigated. Or, It can simply be the case that one of my scientist collegues wants to run an experiment during the week-end. I have to abide by these requests. We have the permit to use the dish only if no other activity inteferes. I did not want to raise the EME communitys expectations because of this. (Hence the lack of continous updates.) My advice to all those that are looking forward to the week-end is to stay tuned. We will advertise times and frequencies (or if the activity has to be cancelled) in time before the week-end on this forum. Thank you for your understanding and 73 Ulf Kylenfall - SM6GXV Onsala Space Observatory Chalmers University of Technology Sweden. _______________________________________________ Moon mailing list Moon(a)moonbounce.info http://www.moonbounce.info/mailman/listinfo/moon Please enter/update your standings: http://www.vhf-dx.net/top.html When you decide to remain anonymous I may consider this unpolite and remove you from the list -- Ingolf, SM6FHZ http://www.2ingandlin.se/SM6FHZ.htm

11 years, 8 months

preamps

by Paul Decker

Hi all, OK, I have a 432 MHz preamp, tx sequenceer, bypass relays, all ready to go for this weekends antenna work. Minor question for the group. Is it better to leave power to the preamp on, or turn it on/off with the sequencer when switcihng between rx/tx? If all goes well, I should have 64 elements, 500 watts, and 25 db of preamp ready to try some eme. thanks, Paul

11 years, 9 months

Re: [Moon-net] [Moon-net GG] Re: GS35b amp input problem - resolved

by Bill Dzurilla

Thanks to the literally dozens of folks who emailed with ideas and suggestions. Never did really figure out what was wrong, but Amplitec has kindly exchanged the amp for a different one that is working great (knock on wood), just in time for the upcoming week of good EME conditions. After all this, sure hope to make at least a few 6m EME contacts at my moonset from here in Slovakia. 73, Bill NZ5N/OM3BD JN88mf --- On Sat, 6/25/11, Bill Dzurilla <billdz.geo(a)yahoo.com> wrote: > From: Bill Dzurilla <billdz.geo(a)yahoo.com> > Subject: Re: [Moon-net GG] Re: GS35b amp input problem - still not solved > To: moon-net(a)mailman.pe1itr.com, Outposter30(a)shaw.ca > Cc: moon-net(a)googlegroups.com > Date: Saturday, June 25, 2011, 12:32 PM > Not sure if this group allows email > attachments, but here's the schematic of the antenna relay > and PTT unit of the amp. If the attachment does not go > through, please email me for a copy. > > 73, Bill > > --- On Fri, 6/24/11, Bill Dzurilla <billdz.geo(a)yahoo.com> > wrote: > > > From: Bill Dzurilla <billdz.geo(a)yahoo.com> > > Subject: Re: [Moon-net GG] Re: GS35b amp input problem > - still not solved > > To: moon-net(a)mailman.pe1itr.com, > Outposter30(a)shaw.ca > > Cc: moon-net(a)googlegroups.com > > Date: Friday, June 24, 2011, 7:23 PM > > I do have a schematic, I'll try to > > find a way to scan it and upload. The amp has a > built > > in sequencer. The PTT jack is connected to a 1k > > resistor, which attaches to the base of a > transistor. > > The transistor's collector is grounded and the emitter > goes > > to the switching relays. > > > > --- On Fri, 6/24/11, Jordan <outposter30(a)shaw.ca> > > wrote: > > > > > From: Jordan <outposter30(a)shaw.ca> > > > Subject: Re: [Moon-net GG] Re: GS35b amp input > problem > > - still not solved > > > To: billdz.geo(a)yahoo.com, > > moon-net(a)mailman.pe1itr.com > > > Cc: moon-net(a)googlegroups.com > > > Date: Friday, June 24, 2011, 6:49 PM > > > Get the controlled relay as close to > > > the amp PTT port as possible, and be sure it > switches > > > directly to Amp ground on keying. > > > > > > Is there a schematic of your isolation cktry, and > amp > > > keying ckt...? > > > > > > 73...Jordan VE6ZT > > > > > > > > > ----- Original Message ----- From: "Bill > Dzurilla" > > <billdz.geo(a)yahoo.com> > > > To: <moon-net(a)mailman.pe1itr.com> > > > Cc: <moon-net(a)googlegroups.com> > > > Sent: Friday, June 24, 2011 4:35 PM > > > Subject: [Moon-net GG] Re: GS35b amp input > problem - > > still > > > not solved > > > > > > > > > Thanks to all who replied to my prior posts about > my > > 6 > > > meter PTT problem. Unfortunately, the problem has > not > > been > > > solved, and hopes are growing dimmer. > > > > > > Today my friend came back with his TS-480, this > time > > with a > > > PTT cable (last time we had to use a shorted RCA > plug > > to > > > turn on the amp). With his PTT cable attached > > between > > > the TS-480 and the amp, we had the same problem I > had > > with > > > my FT-847, low output and a high pitched noise > from > > the > > > vicinity of the GS-35b tube. Extensive efforts > to > > find > > > the cause and fear produced no real clues. > > > > > > To recap, here's what we know, what has been > tried, > > and > > > what can't be tried: > > > > > > * If the amp is keyed with a shorted RCA plug, we > get > > full > > > power and no noise with both the FT-847 and the > > > TS-480. This is true even if the shorting cable > is > > > unshielded. > > > > > > * If the amp is keyed with a PTT cable running > from > > the > > > transceiver to the amp, we get noise and low > power, > > with > > > both the FT-847 and the TS-480. > > > > > > * We tried bypass capacitors on the PTT cables, > no > > > improvement. > > > > > > * We tried coiling the PTT cables, no > improvement. > > > > > > * We would have liked to have tried adding > ferrite to > > the > > > PTT lines but could not find any and are unlikely > to > > find > > > any. > > > > > > * We tried isolating the amp from the transceiver > with > > 2 > > > different amp keyer isolators, one with a reed > relay > > and the > > > other with a transistor circuit. Neither > helped. We > > > tried using both of the isolators in cascade, but > that > > did > > > not help either. > > > > > > * We do not have access to a spectrum analyzer or > an > > > oscilloscope. > > > > > > * The SWR between the transceiver and the amp > measures > > low, > > > both with the FT-847 and the TS-480. The SWR > > between > > > amp output and the antenna also is low. > > > > > > * The amp is brand new and under warranty. The > amp > > > may or may be not responsible for the problem, we > just > > do > > > not know. The builder is willing to check > > everything > > > out and attempt to solve the problem, if I return > the > > amp to > > > his shop in Hungary. That's not a very > attractive > > > option, as it is about a 4 hour drive each way to > his > > shop > > > from here in Slovakia. > > > > > > Anyone have any further ideas? > > > > > > 73, Bill NZ5N/OM3BD > > > > > > --- On Mon, 6/20/11, Bill Dzurilla <billdz.geo(a)yahoo.com> > > > wrote: > > > > > > > From: Bill Dzurilla <billdz.geo(a)yahoo.com> > > > > Subject: Re: GS35b amp input problem > > > > To: moon-net(a)mailman.pe1itr.com > > > > Cc: moon-net(a)googlegroups.com > > > > Date: Monday, June 20, 2011, 6:59 PM > > > > Thanks to the many folks who replied > > > > to my question. Many of the replies had > great > > > > suggestions, but only one person -- Lance > W7GJ -- > > hit > > > on > > > > what appears to be my problem. Lance > suggested > > the > > > > problem might be in the PTT line. It seemed > > > improbable > > > > that this could be the issue, but when I > replaced > > the > > > PTT > > > > line from my FT-847 to the amp with a > shorted > > RCA > > > plug, sure > > > > enough the noise was gone and the output was > up > > to a > > > > kilowatt. > > > > > > > > We used the same shorted plug when we ran > the > > test > > > with the > > > > TS-480, so it's very possible the same > problem > > would > > > occur > > > > had a PTT line been connected to the > TS-480. > > > > > > > > I have a homebrew PTT isolator, the device > that > > > connects > > > > the rig's PTT line to a relay, and when PTT > is > > engaged > > > the > > > > relay closes and triggers the amp, and I > thought > > for > > > sure > > > > this would solve my problem, but it did > not. > > Even > > > with > > > > the isolator in line, I get the noise and > the > > low > > > output. > > > > > > > > Any thoughts? Where do I go from here? > > > > > > > > 73, Bill > > > > > > > > --- On Mon, 6/20/11, Bill Dzurilla <billdz.geo(a)yahoo.com> > > > > wrote: > > > > > > > > > From: Bill Dzurilla <billdz.geo(a)yahoo.com> > > > > > Subject: GS35b amp input problem > > > > > To: moon-net(a)mailman.pe1itr.com, > > > > "Alex Artieda" <hb9dri(a)emeham.com> > > > > > Cc: moon-net(a)googlegroups.com > > > > > Date: Monday, June 20, 2011, 10:45 AM > > > > > Hi, > > > > > > > > > > I bought a new Amplitec 160-6m kilowatt > amp > > with > > > a > > > > GS-35b > > > > > tube, details of the amp at > > www.amplitec.hu. > > > Driven > > > > by > > > > > my FT847, the amp works great on > 160-10 > > meters. > > > > > However, on 6 meters there is a > strange > > issue. I > > > > was > > > > > only getting 600w out, the tube lit up > much > > > brighter > > > > than on > > > > > other bands, and there was a > high-pitched > > noise, > > > like > > > > a > > > > > squeal or whistle, coming from the area > of > > the > > > > GS-35b. > > > > > > > > > > My friend came today with his radio and > a 6 > > > meter > > > > antenna. > > > > > First we tried his antenna with the > amp. No > > > success, > > > > still > > > > > 600 watts and the high pitch noise. > > > > > > > > > > Then we replaced my FT847 transceiver > with > > his > > > > Kenwood > > > > > TS480. Success! No noise, 1100 watts > output. > > But > > > why? > > > > Both > > > > > radios have exactly the same output, > 100 > > watts, > > > we > > > > used the > > > > > same power supply, and we used the > same > > coax > > > > jumpers. > > > > > Also, when we tested the amp at the > home of > > the > > > > Amplitec > > > > > owner, he used an FT847 and there was > over > > 1000w > > > out > > > > with no > > > > > noise. > > > > > > > > > > So, it appears that the problem is > somehow > > > related to > > > > my > > > > > FT847. Any thoughts on what might be > wrong > > or a > > > > > possible fix? Need to get this working > in > > time > > > for > > > > the > > > > > good EME conditions starting June 30. > > > > > > > > > > 73, Bill NZ5N/OM3BD > > > > > > > > > > > > > > > > > > > > -- > > > _______________________________________________________ > > > To post to this group, send email to moon-net(a)googlegroups.com > > > For more options, visit this group at > > > http://groups.google.com/group/moon-net?hl=en > > > > > > -- > > > _______________________________________________________ > > > To post to this group, send email to moon-net(a)googlegroups.com > > > For more options, visit this group at > > > http://groups.google.com/group/moon-net?hl=en > > > > >

11 years, 9 months

Re: [Moon-net] preamps

by Mike KL6M

Hi Paul I'll put the 432 feed in for you for this weekend. My preamp is always on. There are X schools of thought on it (from a lot of folks who are in to theory and have minimal EXPERIENCE). When I ran my AMSAT stuff years ago my MGF1302s were blowing like popcorn due to switching them on and off. I've never turned my LNA off since and have never blown one. 73 Mike, KL6M BP51dc http://www.qsl.net/kl6m > > > > > Hi all,Â > > > > OK, I have a 432 MHz preamp, tx sequenceer, bypass relays, all ready to go > for this weekends antenna work. > > > > > > Minor question for the group.Â Â Is it better to leave power to the > preamp on, or turn it on/off with the sequencer when switcihng between > rx/tx? > > > > If all goes well, I should have 64 elements, 500 watts, and 25 db of > preamp ready to try some eme. > > > thanks, > > Paul > > > > > _______________________________________________ > Moon-Net posting and subscription instructions are at > http://www.nlsa.com/nets/moon-net-help.html > >

11 years, 9 months

JA8CMY?

by DEHAYS Dominique

Hi , I'm looking for JA8CMY e mail , any help? 73 Dom

11 years, 9 months

1.2 ghz EME

by Ian McCloy

Wondering what is the smallest dish that one can use to be successful on 1.2 ghz EME Ian VE7IRA

11 years, 9 months

8877 filament current draw

by Edward R. Cole

Testing my 2m-8877 after several months QRT, I am only getting 800w output. That is partly due to only achieving 30w drive from the FT-847 (but it drives into a dummy load at 50w). Peaking the 8877 input does not increase either drive or output. Output is also peaked (should not require much tuning as it was not changed since it last ran at 1400w and SWR is nearly the same). Anode current is low as a result. HV is normal and grid current is a little low (typ. of low drive). I checked filament voltage and it is only running 4.6 vac (whereas it used to run 4.9-4.85 vac). Could the low filament voltage be affecting the input impedance and explain the low RF output? Is this indicative of a failing tube? I have one higher tap on my filament transformer that will apply higher voltage to the filaments. I can try that to see if it raises the filament level. With filament and cathode disconnected the filament transformer is running (open circuit) at 5.06 vac. The transformer is rated to 11 amps at 5vac. When I last ran the amp in February, I was running 1300-1400w but after about 20-30 minutes of one-minute transmit cycles power dropped to zero and anode voltage was 2500v vs 3700v. I didn't troubleshoot further but was suspecting a drop in HV as the cause. I do not know what was causing that but was planning to try duplicating the condition, today. But with the amp running as it is I may have other issues. Probably not good to run the filaments that low very long. 73, Ed - KL7UW, WD2XSH/45 ====================================== BP40IQ 500 KHz - 10-GHz www.kl7uw.com EME: 50-1.1kw?, 144-1.4kw, 432-100w, 1296-60w, 3400-? DUBUS Magazine USA Rep dubususa(a)gmail.com ======================================

11 years, 9 months

Antennas for sale

by Eddy Jespers

Hi, I have for sale a number of antennas that can be used for EME : 1. 3,7 m diameter solid reflectors , I have 6 pcs available. These antennas where used for CATV reception in the old days. 2. 2,4 m diameter solid aluminum reflectors, I have 8 pcs available. These antennas are TX/RX and have a dual waveguide ( WR-75 ) going to the back of the antenna. These are very high quality antennas, approved by Eutelsat and Intelsat to transmit on their satellites. 3. 2,4 m diameter solid aluminum VERTEX antenna, 1 pcs available. This is a casegrain reflector with a large sub reflector cage. Very rugid antenna. 4. 2,4 m Prodelin 4pcs reflector complete with feed supports and de-icing. Prodelin model # 1244 5. Yagi antennas from WIPIC. These are professional UHF and VHF antennas. Most of them are brand new. They are nice to use for their stainless steel hardware and very nice boom to mast and element to boom clamps, to roll you own antennas. I have set some pictures on a website : http://www.on7un.net/for_sale.htm If you are going to use the antennas for the hobby, ( EME or amateur-DSN ) , the price will be around the price of scrap aluminum, so very cheap. You arrange the shipping. I will hold the antennas until the end of September, after that the antennas will be scrapped and sold for the Aluminum to a scrap yard. All antennas are located here in Belgium. Please contact me off line : ejespers(a)telenet.be Vy 73's Eddy ON7UN www.on7un.net

11 years, 9 months

Re: [Moon-net] Mods for KLM 30 LBX 432 ant??

by Steve Gross-N4PZ

Hi Chuck The guy has one up and operating on 432. I never even heard of the antennas so I put the question out on the reflector. "KLM 30 LBX for 432 Mhz" is what he told me. 73 Steve > Date: Mon, 27 Jun 2011 20:39:20 -0700 > To: n4pz(a)live.com > From: w7cs(a)theriver.com > Subject: Re: [Moon-net] Mods for KLM 30 LBX 432 ant?? > > Are you sure it wasn't a 16 LBX (2 M) ? I'm not aware of a 30LBX, > maybe it's for 432 ? Mike Staal built me the first beta KLM 16 LBXs > that I used for 2M EME. They worked great and the results sold a > lot of antennas then. > 73, > > Chuck, W7CS > > > > At 07:33 PM 6/27/2011, you wrote: > >Does anyone have the modifications for the KLM antenna model 30 LBX?? > >I need them for a friend and he can not locate them. > >Thanks much. > >73 > >Steve N4PZ > >PS If I am duplicating my postings on moon net please let me know. > >I think I figured out why I was doing that. > >_______________________________________________ > >Moon-Net posting and subscription instructions are at > >http://www.nlsa.com/nets/moon-net-help.html >

11 years, 9 months

Henry Tempo 2002

by Ian McCloy

Still looking for a working replacement transformer for my Henry Tempo 2002 Some one must have a working one from an amplifier that is no longer working Thanks Ian VE7IRA

11 years, 9 months

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Moon-net June 2011