August 2008 - AMSAT-BB - mailman.amsat.org

Re: 5500 maintenance ?
by w7lrd＠comcast.net 17 Aug '08

17 Aug '08

I have found that no matter what it is always easier to do some simple preventative maintenance while it is on the bench as opposed to being stuck in the middle of January in a snow storm, up on the tower. Remember Mr. Murphy is always looking for us! 73 Bob W7LRD Seattle -- "if this were easy, everyone would be doing it" -------------- Original message -------------- From: "i8cvs" <domenico.i8cvs(a)tin.it> > ----- Original Message ----- > From: "nader omer" > To: > Sent: Sunday, August 17, 2008 1:08 AM > Subject: [amsat-bb] 5500 maintenance ? > > After two years of storing my new 5500 rotor in upside position in a hot > place. I found small pool (2X2 cm) of a yellow oily liquid under it . > Dose this rotor need any maintenance before I can reuse it again? > > > Hi my friend Nader, ST2NH > > If the rotor works I don't think that preventional maintenance is actually > strictly necessary. > > FO-29 is back again with strong signals and I hope to meet you again from > Saudy Arabia. > > 73" de > > i8CVS Domenico > > > > > _______________________________________________ > Sent via AMSAT-BB(a)amsat.org. Opinions expressed are those of the author. > Not an AMSAT-NA member? Join now to support the amateur satellite program! > Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb

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Re: G-5500 7806 regulator question-update
by Mark L. Hammond 17 Aug '08

17 Aug '08

Okay, thanks to all for the quick suggestions!! I forgot about the trick of using a diode (or two) on the ground leg of the regulator as a means to increase the regulated voltage. Another good suggesion was to use a LM-317 and adjust it as needed. Other info: I found inexpensive 7806 devices with LOW shipping (via US Post) at Parts-Express.com, so I should have some arrive here in a few days. Again, thanks to all for the suggestions and help! Mark N8MH _____ Hello All, It appears that the 7806 voltage regulator in my Yaesu G-5500 control box has gone bad; the output is measuring more like 10.8 Volts (!). This explains why both position indicators were off by a factor of 2 (e.g., elevation meter showing 90 deg, array pointing 45; azimuth meter showing 180 deg, but array pointing 90 deg., and so on). Question---has anybody used a 7805 to replace the 7806 regulator in this control box? I don't have a 7806....so this brings the next question--anybody have a 7806 (or 2) that they want to sell?) Thanks, Mark L. Hammond [N8MH]

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5500 maintenance ?
by nader omer 17 Aug '08

17 Aug '08

After two years of storing my new 5500 rotor in upside position in a hot place. I found small pool (2X2 cm) of a yellow oily liquid under it . Dose this rotor need any maintenance before I can reuse it again?

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SSB Preamp
by Peter 16 Aug '08

16 Aug '08

HI, "The fault lies in thyself", was uttered many moons ago but that quote now applies to me! In summary I could not get my SSB 70cm preamp to work with my Icom 910; Jerry of SSB gave me terrific support to try get it working, and found it hard to believe that the relays engaged and it did not function. He said in 15 years not one was DOA, and said the only conclusion was that it was connected to the wrong antenna. I did the system checks that were suggested by this BB and still no joy. Convinced that the unit had a problem I sent the SSB Preamp back to Larry, no surprise it checked out fine; guess what the coax was put to the wrong antenna upon installation. I'm the "village idiot"! I want to thank all those that responded, this BB is a terrific asset to anyone interested in getting help with Satellite activity, thank you and my sincere apologies for taking up the bandwidth an so much of Jerry's valuable time. 73, Pete, WB2OQQ

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Dayton Sat Demos on CQ VHF cover
by Gould Smith 16 Aug '08

16 Aug '08

Dayton 2008 AMSAT satellite demonstration volunteers Keith Pugh, W5IU and Mark Hammond, N8MH are featured on the cover of the Summer issue of CQ VHF magazine. There is also a large color photograph of the AMSAT booth in the article on Dayton. Many interesting articles are also included in this issue. 73, Gould, WA4SXM

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Folded Dipole Dimensions
by Reicher, James 16 Aug '08

16 Aug '08

I'm trying to home-brew a pair of crossed yagis; one for 2 meters and one for 70cm but I need help with the dimensions. I want to use folded dipoles for the driven elements. What size should they be to be resonant at: 1. 145.800 MHz 2. 435.000 MHz 73 de W0HV, Jim in Raymore, MO Light travels faster than sound... This is why some people appear bright until you hear them speak.

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re. COMPASS-1 recovery attempt 2015utc: failed
by Angus 16 Aug '08

16 Aug '08

I have monitored the last 2 good passes and heard nothing on the downlink frequency. Was hoping that someone might get through with the commands. Hope everyone keeps trying regards Gus M0IKB PA3GUO wrote >During the entire pass (max 72 degrees elevation) I have >submitted the commands (mostly only the first one, a few >times all four of them shortly after eachother). >However, I have not heared a single tone on the downlink >so we must assume this attempt failed. >Henk, PA3GUO -- I am using the free version of SPAMfighter for private users. It has removed 1834 spam emails to date. Paying users do not have this message in their emails. Get the free SPAMfighter here: http://www.spamfighter.com/len

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SEEDS in CW Mode?
by Bruce Robertson 16 Aug '08

16 Aug '08

It seems that SEEDS is in CW mode. Around 16:05 today, nstead of the cheery chorus of children, I heard thumping on FM, so I switched over to CW. The doppler seemed way off, so I wasn't able to copy any code, but the signal disappeared at exactly the right time. Alternatively, it was another satellite that I don't have programmed into my SatPC32 right now, but in that case SEEDS' signal was unusually low. 73, Bruce VE9QRP

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go-32 status
by Mr Jeffrey L Ross 16 Aug '08

16 Aug '08

hi folks, last time i tryed to copy go-32 it gave me a strong signal but no data. same with ao-51. I think there working with ao-51 on the usa passes though. kc8gkf

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FO-29
by Peter 16 Aug '08

16 Aug '08

Hi, I was following a 15:46 pass today in NY of FO-29, all my past experience's have been with the FM birds. I am using SatPC32 and LVB tracker, the program went into "Flip" mode at AOS, setting the elevation at 180 degrees. FO-29 passed overhead and I did not hear it, did I miss something in the setup? Thank you. 73, Pete, WB2OQQ

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