July 2007 - AMSAT-BB - mailman.amsat.org

coax patch after the LMR 600
by Prathap Kumar 10 Jul '07

10 Jul '07

Hi All I am getting my new 30 ft tower and wish to changeover from RG213 to LMR600 I have, for the Vhf and Uhf cross yagis. Will be installing my masthead preamp too and its going to be convinient to use a short length of thinner coax patch upto the Beams near the AZEL. So any tips , suggestions on the type of thin cable RG-58 or RG-213. Thank you Best 73 Pop VU2POP :o) Vhf & Uhf cross yagis, Masthead preamp for Vhf, AZEL with digital readouts all home brew ;o)

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L/S Mode
by Bruce 10 Jul '07

10 Jul '07

BB Either my S-Band D/L is not working or the sat never shifted into the new mode. Comments from the bb. 73 Bruce KG4YEV

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AO-51 mode LS!
by Alan P. Biddle 10 Jul '07

10 Jul '07

All, Worked the next full pass in mode LS. AI7W was on with a great signal, and N7DRB(?) called a couple of times, but seemed to be in the noise. With fixed CP on the downlink, and linear uplink, I have noticed excellent signals, but with some short term spin QSB related to the aspect of the SC. As expected, putting LS together gives the product of the two. Works great, and not so crowded that you can't have a nice QSO! Alan WA4SCA

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Re: AMSAT-BB Digest, Vol 2, Issue 453
by Gopal Madhavan 10 Jul '07

10 Jul '07

Mounting The G-5500 elevation rotor in any way other than vertical will cause problems as the condensate will not have a way to get out and will ruin the unit. The coordination with actual direction is easy as it just involves pointing the antenna correctly after mounting the unit any way you do. I am not sure if another drain hole drilled would solve the problem of drainage. Incidentally if it is a new unit, please do replace all the bolts holding the two halves together with SS Allen Key type bolts as after sitting in the open the regular screws are very difficult to remove with a regular screwdriver- I have had practical experience on this! Gopal VU2GMN -----Original Message----- From: amsat-bb-bounces(a)amsat.org [mailto:[email protected]] On Behalf Of amsat-bb-request(a)amsat.org Sent: Tuesday, July 10, 2007 13:46 To: amsat-bb(a)amsat.org Subject: AMSAT-BB Digest, Vol 2, Issue 453 Send AMSAT-BB mailing list submissions to amsat-bb(a)amsat.org To subscribe or unsubscribe via the World Wide Web, visit http://amsat.org/mailman/listinfo/amsat-bb or, via email, send a message with subject or body 'help' to amsat-bb-request(a)amsat.org You can reach the person managing the list at amsat-bb-owner(a)amsat.org When replying, please edit your Subject line so it is more specific than "Re: Contents of AMSAT-BB digest..." Today's Topics: 1. Re: Mounting Elevation part of g-5500 (David Johnson) 2. Re: Mounting Elevation part of g-5500 (George Henry) 3. L/S Mode (Bruce) 4. Re: L/S Mode (Greg D.) 5. Re: L/S Mode (Greg D.) 6. Re: L/S Mode (w7lrd(a)comcast.net) 7. AO-51 (Viktor Kudielka) 8. coax patch after the LMR 600 (Prathap Kumar) ---------------------------------------------------------------------- Message: 1 Date: Mon, 9 Jul 2007 23:11:54 +0100 From: David Johnson <g4dpz(a)mac.com> Subject: [amsat-bb] Re: Mounting Elevation part of g-5500 To: Michael Wolthuis <wolthui3(a)msu.edu> Cc: AMSAT-BB <amsat-bb(a)amsat.org> Message-ID: <F6898B86-C33F-45E0-8ABA-B152A0BCE636(a)mac.com> Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed Hi, Beware mounting it at 90 degrees to the vertical. It has a drain hole at the bottom to allow for the drainage of condensation when mounted on the 'U' bracket. 73 Dave On 9 Jul 2007, at 22:48, Michael Wolthuis wrote: > Quick question on mounting a g-5500 elevation router. Does it matter > which way you mount it or can you set the controller to know where it > is? This is a little hard to explain, but I want to mount it so the > mass of the controller is horizontal to the ground, not vertical like > when the az/el are package together. If I do this, will I be able to > set the antennas somehow so the controller knows where they are or > does it determine that on its own? > > If I mount it wrong and the controller can not be told where it is > (ie. calibrated) then all of my degrees would be off by 90 because I > am mounting the elevation portion horizontal instead of vertical. > > I hope this question makes sense, but I don't want to assemble it all > up high and then findout it doesn't work as planned. > > Thanks for any input! > > Mike > kb8zgl > > _______________________________________________ > 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 ------------------------------ Message: 2 Date: Mon, 9 Jul 2007 18:38:07 -0500 From: "George Henry" <ka3hsw(a)earthlink.net> Subject: [amsat-bb] Re: Mounting Elevation part of g-5500 To: "amsat bb" <amsat-bb(a)amsat.org> Message-ID: <003601c7c282$349203f0$0500a8c0@parents> Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=original As David already mentioned, you may create drainage problems by mounting your elevation rotor horizontally... if you want to block the existing hole, and drill a new one in the new "bottom" of the rotor, you may be okay, but "you pays your nickel, you takes your chances". As far as "setting" the antenna position, the controller doesn't care how the rotor itself is mounted: when the rotor is at the zero degree limit of its travel, you mount your antennas pointing at the horizon, and you have established the zero degree position. Everything is relative from there. George, KA3HSW ----- Original Message ----- From: "Michael Wolthuis" <wolthui3(a)msu.edu> To: "AMSAT-BB" <amsat-bb(a)amsat.org> Sent: Monday, July 09, 2007 4:48 PM Subject: [amsat-bb] Mounting Elevation part of g-5500 > Quick question on mounting a g-5500 elevation router. Does it matter > which way you mount it or can you set the controller to know where it > is? This is a little hard to explain, but I want to mount it so the > mass of the controller is horizontal to the ground, not vertical like > when the az/el are package together. If I do this, will I be able to > set the antennas somehow so the controller knows where they are or > does it determine that on its own? > > If I mount it wrong and the controller can not be told where it is > (ie. calibrated) then all of my degrees would be off by 90 because I > am mounting the elevation portion horizontal instead of vertical. > > I hope this question makes sense, but I don't want to assemble it all > up high and then findout it doesn't work as planned. > > Thanks for any input! > > Mike > kb8zgl ------------------------------ Message: 3 Date: Mon, 9 Jul 2007 22:26:06 -0400 From: "Bruce" <snyderb(a)cox.net> Subject: [amsat-bb] L/S Mode To: <amsat-bb(a)amsat.org> Message-ID: <000701c7c299$ab5f8fe0$6501a8c0@W5YI> Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=original BB Either my S-Band D/L is not working or the sat never shifted into the new mode. Comments from the bb. 73 Bruce KG4YEV ------------------------------ Message: 4 Date: Mon, 09 Jul 2007 20:53:55 -0700 From: "Greg D." <ko6th_greg(a)hotmail.com> Subject: [amsat-bb] Re: L/S Mode To: snyderb(a)cox.net, amsat-bb(a)amsat.org Message-ID: <BAY118-F11DEC2520AD5D137F59582A9050(a)phx.gbl> Content-Type: text/plain; format=flowed Hi Bruce, Well something's working. I just finished the 03:30z pass here. I heard a couple of partial calls on the 2401.200+/- ghz downlink - VE7C?? and another partial suffix. The pass started with someone with a nice clear signal and a Spanish/Mexican accent. There was a call sign, but I didn't catch it. However, I was not able to get into the bird myself on 1268.700 +/-. Not even a change in static, even right after I heard an apparent full-quieting "kerchunk". This is with my new and unproven helix antenna, so I have one too many unknowns here to know what the problem is. I did follow the same doppler process on the L-band uplink, and also swept the general vicinity, so that shouldn;t have been the problem, and the pass peaked at about 50 degrees. Nothing back from my uplink. Anybody else have a go at it? Greg KO6TH. ----Original Message Follows---- From: "Bruce" <snyderb(a)cox.net> To: <amsat-bb(a)amsat.org> Subject: [amsat-bb] L/S Mode Date: Mon, 9 Jul 2007 22:26:06 -0400 BB Either my S-Band D/L is not working or the sat never shifted into the new mode. Comments from the bb. 73 Bruce KG4YEV _______________________________________________ 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 _________________________________________________________________ http://imagine-windowslive.com/hotmail/?locale=en-us&ocid=TXT_TAGHM_migratio n_HM_mini_pcmag_0507 ------------------------------ Message: 5 Date: Mon, 09 Jul 2007 22:27:55 -0700 From: "Greg D." <ko6th_greg(a)hotmail.com> Subject: [amsat-bb] Re: L/S Mode To: amsat-bb(a)amsat.org Message-ID: <BAY118-F124B08E8830FF145F8E2E3A9050(a)phx.gbl> Content-Type: text/plain; format=flowed Nothing heard on the 05:10z pass. Only a 10 degree pass, but off in a favorable direction (no trees). Downlink carrier was very weak and barely there, if at all. Keying up on 1268 had no effect, as before, though I doubt I would have heard anything even if it had.. Anybody having success? Greg KO6TH ----Original Message Follows---- From: "Greg D." <ko6th_greg(a)hotmail.com> To: snyderb(a)cox.net, amsat-bb(a)amsat.org Subject: [amsat-bb] Re: L/S Mode Date: Mon, 09 Jul 2007 20:53:55 -0700 Hi Bruce, Well something's working. I just finished the 03:30z pass here. I heard a couple of partial calls on the 2401.200+/- ghz downlink - VE7C?? and another partial suffix. The pass started with someone with a nice clear signal and a Spanish/Mexican accent. There was a call sign, but I didn't catch it. However, I was not able to get into the bird myself on 1268.700 +/-. Not even a change in static, even right after I heard an apparent full-quieting "kerchunk". This is with my new and unproven helix antenna, so I have one too many unknowns here to know what the problem is. I did follow the same doppler process on the L-band uplink, and also swept the general vicinity, so that shouldn;t have been the problem, and the pass peaked at about 50 degrees. Nothing back from my uplink. Anybody else have a go at it? Greg KO6TH. ----Original Message Follows---- From: "Bruce" <snyderb(a)cox.net> To: <amsat-bb(a)amsat.org> Subject: [amsat-bb] L/S Mode Date: Mon, 9 Jul 2007 22:26:06 -0400 BB Either my S-Band D/L is not working or the sat never shifted into the new mode. Comments from the bb. 73 Bruce KG4YEV _______________________________________________ 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 _________________________________________________________________ http://imagine-windowslive.com/hotmail/?locale=en-us&ocid=TXT_TAGHM_migratio n_HM_mini_pcmag_0507 _______________________________________________ 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 _________________________________________________________________ http://imagine-windowslive.com/hotmail/?locale=en-us&ocid=TXT_TAGHM_migratio n_HM_mini_pcmag_0507 ------------------------------ Message: 6 Date: Tue, 10 Jul 2007 06:59:07 +0000 From: w7lrd(a)comcast.net Subject: [amsat-bb] Re: L/S Mode To: "Greg D." <ko6th_greg(a)hotmail.com>, amsat-bb(a)amsat.org Message-ID: <071020070659.6265.46932E3B000A1D520000187922120207840B9D04C999(a)comcast.net> Content-Type: text/plain Greg and I will try to make every pass available on 7/10. I have been praying to the L band gods. We'll see what happens. 10 watts-40feet hardline-40 turn helix. 73 Bob W7LRD Seattle -------------- Original message -------------- From: "Greg D." <ko6th_greg(a)hotmail.com> > Nothing heard on the 05:10z pass. Only a 10 degree pass, but off in a > favorable direction (no trees). Downlink carrier was very weak and barely > there, if at all. Keying up on 1268 had no effect, as before, though I > doubt I would have heard anything even if it had.. > > Anybody having success? > > Greg KO6TH > > > ----Original Message Follows---- > From: "Greg D." > To: snyderb(a)cox.net, amsat-bb(a)amsat.org > Subject: [amsat-bb] Re: L/S Mode > Date: Mon, 09 Jul 2007 20:53:55 -0700 > > Hi Bruce, > > Well something's working. I just finished the 03:30z pass here. I heard a > couple of partial calls on the 2401.200+/- ghz downlink - VE7C?? and another > partial suffix. The pass started with someone with a nice clear signal and > a Spanish/Mexican accent. There was a call sign, but I didn't catch it. > > However, I was not able to get into the bird myself on 1268.700 +/-. Not > even a change in static, even right after I heard an apparent full-quieting > "kerchunk". This is with my new and unproven helix antenna, so I have one > too many unknowns here to know what the problem is. I did follow the same > doppler process on the L-band uplink, and also swept the general vicinity, > so that shouldn;t have been the problem, and the pass peaked at about 50 > degrees. Nothing back from my uplink. > > Anybody else have a go at it? > > Greg KO6TH. > > > ----Original Message Follows---- > From: "Bruce" > To: > Subject: [amsat-bb] L/S Mode > Date: Mon, 9 Jul 2007 22:26:06 -0400 > > BB > > Either my S-Band D/L is not working or the sat never shifted into the > new > mode. Comments from the bb. > > 73 Bruce KG4YEV > > _______________________________________________ > 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 > > _________________________________________________________________ > http://imagine-windowslive.com/hotmail/?locale=en-us&ocid=TXT_TAGHM_migratio n_HM > _mini_pcmag_0507 > > _______________________________________________ > 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 > > _________________________________________________________________ > http://imagine-windowslive.com/hotmail/?locale=en-us&ocid=TXT_TAGHM_migratio n_HM > _mini_pcmag_0507 > > _______________________________________________ > 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 ------------------------------ Message: 7 Date: Tue, 10 Jul 2007 07:29:01 +0000 From: Viktor Kudielka <viktor.kudielka(a)ieee.org> Subject: [amsat-bb] AO-51 To: amsat-bb(a)amsat.org Message-ID: <20070710072901.GA10913(a)saturn.oe1kib.ampr.org> Content-Type: text/plain; charset=us-ascii July 10; 07:15 UTC AO-51 over Vienna in V/S mode, with uplink on 145.920 MHz, very strong signals! Vy 73, Viktor, OE1VKW ------------------------------ Message: 8 Date: Tue, 10 Jul 2007 13:45:49 +0530 From: "Prathap Kumar" <vu2pop(a)gmail.com> Subject: [amsat-bb] coax patch after the LMR 600 To: <amsat-bb(a)amsat.org> Message-ID: <005601c7c2ca$89334750$2201a8c0@p9c9fa16b80794> Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=original Hi All I am getting my new 30 ft tower and wish to changeover from RG213 to LMR600 I have, for the Vhf and Uhf cross yagis. Will be installing my masthead preamp too and its going to be convinient to use a short length of thinner coax patch upto the Beams near the AZEL. So any tips , suggestions on the type of thin cable RG-58 or RG-213. Thank you Best 73 Pop VU2POP :o) Vhf & Uhf cross yagis, Masthead preamp for Vhf, AZEL with digital readouts all home brew ;o) ------------------------------ _______________________________________________ Sent via amsat-bb(a)amsat.org. Opinions expressed are those of the author. Not an AMSAT member? Join now to support the amateur satellite program! http://amsat.org/mailman/listinfo/amsat-bb End of AMSAT-BB Digest, Vol 2, Issue 453 ****************************************

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AO-51
by Viktor Kudielka 10 Jul '07

10 Jul '07

July 10; 07:15 UTC AO-51 over Vienna in V/S mode, with uplink on 145.920 MHz, very strong signals! Vy 73, Viktor, OE1VKW

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Re: L/S Mode
by w7lrd＠comcast.net 10 Jul '07

10 Jul '07

Greg and I will try to make every pass available on 7/10. I have been praying to the L band gods. We'll see what happens. 10 watts-40feet hardline-40 turn helix. 73 Bob W7LRD Seattle -------------- Original message -------------- From: "Greg D." <ko6th_greg(a)hotmail.com> > Nothing heard on the 05:10z pass. Only a 10 degree pass, but off in a > favorable direction (no trees). Downlink carrier was very weak and barely > there, if at all. Keying up on 1268 had no effect, as before, though I > doubt I would have heard anything even if it had.. > > Anybody having success? > > Greg KO6TH > > > ----Original Message Follows---- > From: "Greg D." > To: snyderb(a)cox.net, amsat-bb(a)amsat.org > Subject: [amsat-bb] Re: L/S Mode > Date: Mon, 09 Jul 2007 20:53:55 -0700 > > Hi Bruce, > > Well something's working. I just finished the 03:30z pass here. I heard a > couple of partial calls on the 2401.200+/- ghz downlink - VE7C?? and another > partial suffix. The pass started with someone with a nice clear signal and > a Spanish/Mexican accent. There was a call sign, but I didn't catch it. > > However, I was not able to get into the bird myself on 1268.700 +/-. Not > even a change in static, even right after I heard an apparent full-quieting > "kerchunk". This is with my new and unproven helix antenna, so I have one > too many unknowns here to know what the problem is. I did follow the same > doppler process on the L-band uplink, and also swept the general vicinity, > so that shouldn;t have been the problem, and the pass peaked at about 50 > degrees. Nothing back from my uplink. > > Anybody else have a go at it? > > Greg KO6TH. > > > ----Original Message Follows---- > From: "Bruce" > To: > Subject: [amsat-bb] L/S Mode > Date: Mon, 9 Jul 2007 22:26:06 -0400 > > BB > > Either my S-Band D/L is not working or the sat never shifted into the > new > mode. Comments from the bb. > > 73 Bruce KG4YEV > > _______________________________________________ > 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 > > _________________________________________________________________ > http://imagine-windowslive.com/hotmail/?locale=en-us&ocid=TXT_TAGHM_migrati… > _mini_pcmag_0507 > > _______________________________________________ > 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 > > _________________________________________________________________ > http://imagine-windowslive.com/hotmail/?locale=en-us&ocid=TXT_TAGHM_migrati… > _mini_pcmag_0507 > > _______________________________________________ > 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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Newbie in the UK
by Chris Bloy 09 Jul '07

09 Jul '07

Hi All, Are there any members in the UK, well, South Coast (Portsmouth) area belong to the list who would be willing to show me the best way to work the FM sats? Look forward to any replies.. Thanks, Chris... M0DQO UK No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.5.476 / Virus Database: 269.10.1/889 - Release Date: 06/07/2007 20:00

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Re: Newbie in the UK
by Chris Bloy 09 Jul '07

09 Jul '07

Hi John, >>I haven't seen the details yet, but the beginners stream usually runs >>in parallel with the other lectures on the Friday afternoon. I put >>the skeleton 2007 programme up on the AUK website based on what >>happened in 2006 and the details should start to appear in the next >>week or so. >> Ok, well i dont know if i will be able to get the Friday off from work, but will go on the members advise? >>I would be interested to know what email address you sent them to? >> To Jim on the Amsat uk website g3wgm(a)amsat.org? I asked him if they still have an arrow's instock and also sent one after it about the joining side and how its joining so late in the year? >>The Arrow's are produced in the US and they won't ship out of the US >>so its down to the goodness of travelers who bring them back as hand >>baggage. As such they are always in short supply and the best person >>to ask is Jim Heck (g3wgm(a)amsat.org). I wouldn't mind one myself. >> See above, do you have a home setup? I am interested in doing portable working, hence the arrow? Thanks, Chris

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Re: Newbie in the UK
by Chris Bloy 09 Jul '07

09 Jul '07

Hi Paul, Many thanks for the words of advise.. I look forward to perhaps hearing you on AO51 at some point.. Its seems a shame that the US amsat site sat status isnt more up-to-date, as I am unsure of what is correct and what isnt.. thanks, Chris -----Original Message----- From: "Paul Luggar" <luggsey(a)hotmail.com> To: "Chris Bloy" <chris(a)photofuture.co.uk> Date: Mon, 9 Jul 2007 18:26:59 +0100 Subject: Re: [amsat-bb] Re: Newbie in the UK Hi Chris, I just saw your post about Amsat/working sats etc. I went through it all myself and ended up self teaching myself due to the lack of good "elmering" in this area. If I can help just join my forum (Link below) and I will do what I can to answer any questions you may have. My prefrence is the LEO FM sats, all others love the SSB but there is something special about the FM LEO's for me. I'm also heavily into the APRS side of things. 73 Paul Luggar M0SCI Website WWW.M0SCI.CO.UK Amsat-UK Member 6484 www.m0sci.co.uk/forum Devon and Cornwalls Amateur Radio Message Board m0sci(a)gb7cow.#44.gbr.eu ----- Original Message ----- From: "Chris Bloy" <chris(a)photofuture.co.uk> To: <amsat-bb(a)amsat.org> Sent: Monday, July 09, 2007 5:17 PM Subject: [amsat-bb] Re: Newbie in the UK > Hi Howard & All, > > Many thanks to all those who replied to my plee for help both on list and > personally! > > I would like to attend this event, i have checked out the details and > wondered what the best day for me to actually come and watch these demo's? > Perhap someone could take me under there wing on such an event? > > Also, like your web site Howard.. keep up the good work! I have been a > little put off about joining AMSAT due to a couple of emails sent to the > UK > group that havent been replied to at all :( > > one was about the Arrow Antenna and if I should invest and the other was > to > join? Its a big off putting when you dont get a reply at all, hence my > message to the group.. This has really helped and its good to know you > guys > are there to support when needed.. > > All the best, > > Chris Bloy > M0DQO, FAREHAM, UK > > www.sehr.co.uk > > > > -----Original Message----- > From: "Howard Long" <howard(a)howardlong.com> > To: "'Chris Bloy'" <chris(a)photofuture.co.uk>, <amsat-bb(a)amsat.org> > Date: Mon, 9 Jul 2007 09:54:52 +0100 > Subject: RE: [amsat-bb] Newbie in the UK > > > Hi Chris > > Did you get any help? > > There is the AMSAT Colloquium on in a couple of weeks in Guildford - > there's > lots of real live demos there. > > 73, Howard G6LVB > > -----Original Message----- > From: amsat-bb-bounces(a)amsat.org [mailto:[email protected]] On > Behalf Of Chris Bloy > Sent: 07 July 2007 21:21 > To: amsat-bb(a)amsat.org > Subject: [amsat-bb] Newbie in the UK > > Hi All, > > > > Are there any members in the UK, well, South Coast (Portsmouth) area > belong > to the list who would be willing to show me the best way to work the FM > sats? > > > > Look forward to any replies.. > > > > Thanks, > > > Chris... M0DQO > > UK > > > No virus found in this outgoing message. > Checked by AVG Free Edition. > Version: 7.5.476 / Virus Database: 269.10.1/889 - Release Date: 06/07/2007 > 20:00 > > _______________________________________________ > 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 > > > > > > -- > No virus found in this incoming message. > Checked by AVG Free Edition. > Version: 7.5.476 / Virus Database: 269.10.2/891 - Release Date: 08/07/2007 > 18:32 > _______________________________________________ > 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 > -- No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.5.476 / Virus Database: 269.10.2/891 - Release Date: 08/07/2007 18:32

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Re: Future radical satellite designs
by Joe Leikhim 09 Jul '07

09 Jul '07

I have mentioned this before and will again: Why not construct clusters of low voltage batteries each with their own set of solar cells. Then each low voltage battery ( 3 volts or so) has its own boost voltage converter to charge to a much higher voltage bus (15-24 volts). In this way, the failure or depletion of a battery will affect only the available current on the bus, not the voltage. The solar cells could then be placed on all sides of the spacecraft and charge their associated batteries at will, with no concern of having the entire solar cell array in same plane with the sun as there would be with a high voltage string of solar cells. -- Joe Leikhim K4SAT "The RFI-EMI-GUY"© "Treason doth never prosper: what's the reason? For if it prosper, none dare call it treason." "Follow The Money" ;-P

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