[amsat-bb] Question of the day!
Hi All, It is said that NiCad battery cells usually fail to short circuit and that Lithium Ion ones usually fail by just loosing their ability to hold a charge viz they go open circuit Is this true or? many thanks Graham G3VZV ___ Sent via AMSAT-BB@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
[amsat-bb] Re: Question of the day!
On 11/01/12 12:12, g.shirvi...@btinternet.com wrote: Hi All, It is said that NiCad battery cells usually fail to short circuit and that Lithium Ion ones usually fail by just loosing their ability to hold a charge viz they go open circuit Is this true or? many thanks Graham G3VZV It certainly *seems* to be true. We have radios with NiCads that are still struggling on with reduced capacity but when they go, they go dead short across the cell. This is because little whiskers of cadmium eventually grow across the electrolyte. NiMH doesn't seem to do this, and can otherwise be considered a drop-in replacement for NiCad. The Lithium Ion batteries we use seem to hold up pretty well until about 600 cycles, then fall off very rapidly. -- Gordonjcp MM0YEQ ___ Sent via AMSAT-BB@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
[amsat-bb] Re: Question of the day!
Hi Graham, Lithium Ion cells also fail to a short. But, typical consumer LiIon batteries include a safety protection circuit that will disconnect the cell from the battery terminals if the cell voltage drops below the min discharge voltage so it looks like it fails open. For example: http://datasheet.sii-ic.com/en/battery_protection/S8200A_E.pdf 73, Tony AA2TX --- On 1/11/2012 7:12 AM, g.shirvi...@btinternet.com wrote: Hi All, It is said that NiCad battery cells usually fail to short circuit and that Lithium Ion ones usually fail by just loosing their ability to hold a charge viz they go open circuit Is this true or? many thanks Graham G3VZV ___ Sent via AMSAT-BB@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 ___ Sent via AMSAT-BB@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
[amsat-bb] Re: Vega to launch in February
Why not take the awaiting ARISSAT engineering units already built and put a known battery in one of them? Uh Oh, Gould's stomach is growling--HA! Dee -Original Message- From: amsat-bb-boun...@amsat.org [mailto:amsat-bb-boun...@amsat.org] On Behalf Of Bob- W7LRD Sent: Tuesday, January 10, 2012 4:50 PM To: tosca...@umn.edu Cc: amsat-bb@amsat.org Subject: [amsat-bb] Re: Vega to launch in February We should have something sitting on the shelf somewhere just for these and whatever opportunities. 73 W7LRD - Original Message - From: tosca...@umn.edu To: g0...@aol.com Cc: amsat-bb@amsat.org Sent: Tuesday, January 10, 2012 12:20:31 PM Subject: [amsat-bb] Re: Vega to launch in February David: You failed to quote the most fascinating part of the article: The caution is well advised. Statistics show that some two-thirds of the rockets introduced in the past 20 years have had an unsuccessful first outing. It is for this reason that the satellites carried on the qualification flight have been given a free ride. OK, a 66% chance that our satellite would simply blow up, but a 33% chance that we could get a satellite a free ride into a polar orbit. Hmmm... Don't we have some hardware sitting on the shelf that we could offer up to the gods of maiden launches??? Like a linear transponder instead of a single-channel FM transponder? John, Amsat-NA LM #2292 W0JT On Jan 10 2012, g0...@aol.com wrote: FYI 300 x 1450km http://www.bbc.co.uk/news/science-environment-16480111 Europe has named Thursday 9 February as the day it intends to launch its new Vega rocket for the very first time. The 30m-tall vehicle has been developed to take payloads up to 1.5 tonnes into a polar orbit, and will fly from the Kourou spaceport in French Guiana. The project has been led by Italian industry and is years behind on its original schedule. David G0MRF ___ Sent via AMSAT-BB@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 ___ Sent via AMSAT-BB@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 ___ Sent via AMSAT-BB@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 ___ Sent via AMSAT-BB@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
[amsat-bb] Re: Vega to launch in February
Why not take the awaiting ARISSAT engineering units already built and put a known battery in one of them? Uh Oh, Gould's stomach is growling--HA! Dee I know some of you are just having fun, but some really think it's just this easy. Let me sprinkle a little reality here. Vega offered a free launch to EUROPEAN educational CUBESAT projects. Since some of the ones chosen failed to meet the deadline for delivery, had a EUROPEAN group had a 1U cubesat ready to fly, it might have had a chance. The remaining ARISSats have no deployment system, meaning no way to hold it to the rocket, and no way to turn it on, unless someone wants to ride along to flip the three switches and sling it out upon command. Furthermore, ARISSat is volume-wise as large as the two primary payloads, LARES and ALMAsat, and has roughly 50 times the mass of either of the missing cubesats. Fox-1 (and presumably FunCube?) will have more than one flight-capable model built. Fox-1 plans four total, at least two ready to fly, and the other two needing only panels (the expensive part). Had the timing been different, we might have had a spare we could have offered to be flown, but Fox is not that far along yet. BUT! This is the beauty of the cubesat standard. Even if the vehicle changes, the requirements remain the same (or close enough), and late substitutions can be made, possibly. My point is, support Fox-1 and -2 (and FunCube) -now-, so that when the next empty slot turns up, we might be at the point we can respond with a flight ready spacecraft. My version of realityyours may differ :-) 73, Drew KO4MA ___ Sent via AMSAT-BB@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
[amsat-bb] Re: Vega to launch in February
Of course it AINT that easy, however, Let's get the Fox items funded. That's where my antenna tuner money went to... How about the rest of you guys? Support our engineering team's projects. Dee -Original Message- From: Andrew Glasbrenner [mailto:glasbren...@mindspring.com] Sent: Wednesday, January 11, 2012 11:36 AM To: Dee; 'Bob- W7LRD'; tosca...@umn.edu Cc: amsat-bb@amsat.org Subject: Re: [amsat-bb] Re: Vega to launch in February Why not take the awaiting ARISSAT engineering units already built and put a known battery in one of them? Uh Oh, Gould's stomach is growling--HA! Dee I know some of you are just having fun, but some really think it's just this easy. Let me sprinkle a little reality here. Vega offered a free launch to EUROPEAN educational CUBESAT projects. Since some of the ones chosen failed to meet the deadline for delivery, had a EUROPEAN group had a 1U cubesat ready to fly, it might have had a chance. The remaining ARISSats have no deployment system, meaning no way to hold it to the rocket, and no way to turn it on, unless someone wants to ride along to flip the three switches and sling it out upon command. Furthermore, ARISSat is volume-wise as large as the two primary payloads, LARES and ALMAsat, and has roughly 50 times the mass of either of the missing cubesats. Fox-1 (and presumably FunCube?) will have more than one flight-capable model built. Fox-1 plans four total, at least two ready to fly, and the other two needing only panels (the expensive part). Had the timing been different, we might have had a spare we could have offered to be flown, but Fox is not that far along yet. BUT! This is the beauty of the cubesat standard. Even if the vehicle changes, the requirements remain the same (or close enough), and late substitutions can be made, possibly. My point is, support Fox-1 and -2 (and FunCube) -now-, so that when the next empty slot turns up, we might be at the point we can respond with a flight ready spacecraft. My version of realityyours may differ :-) 73, Drew KO4MA ___ Sent via AMSAT-BB@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
[amsat-bb] Re: Palm Springs HamFest 01/28/12
Yep, Looks like myself and XYL Paula, N6VGW, will be making it. Hope to see you all there. 73 Mike WA6ARA On 1/10/2012 12:00 PM, amsat-bb-requ...@amsat.org wrote: Hi! Besides Clint, is anyone else considering a trip to the hamfest in Palm Springs? ___ Sent via AMSAT-BB@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
[amsat-bb] AO-27 11/1801z pass
Thanks for all the contacts. Today I was able to confirm the following stations during the pass: N3YKF, WA5KBH, KF5LOQ, W1PA, KB1RVT, WB3CSY, N2BX, W3KXR, WB8TGY, KD8QBA, N2HVR, K8YSE/P and WC7V. To see where I am, go to this link. I operate in a pasture next to a baseball field on the east side of town. http://aprs.fi/?_s=oscall=a%2FAJ5C-12 73, Bob - HI4/AJ5C ___ Sent via AMSAT-BB@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
[amsat-bb] HI4/AJ5C Operations
Thanks for all the contacts. Today I was able to confirm the following stations during the pass: N3YKF, WA5KBH, KF5LOQ, W1PA, KB1RVT, WB3CSY, N2BX, W3KXR, WB8TGY, KD8QBA, N2HVR, K8YSE/P and WC7V. To see where I am, go to this link. I operate in a pasture next to a baseball field on the east side of town. http://aprs.fi/?_s=oscall=a%2FAJ5C-12 73, Bob - HI4/AJ5C ___ Sent via AMSAT-BB@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
[amsat-bb] Re: Question of the Day - Portable Power
Many chapters of the indispensable guide to everything you need to know about portable power - the book, Batteries in a Portable World - are available absolutely free online from ... http://www.cadex.com I don't leave home without it. Literally: I bought a Kindle version ... (grin) Clint K6LCS ___ Sent via AMSAT-BB@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
[amsat-bb] SatPC key?
I need to purchase a key for PCSat The link to the AMSAT Store is not working.. Where else can I go, pse? TK, K7TRK ___ Sent via AMSAT-BB@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
[amsat-bb] Re: SatPC key?
The store is down because of a server issue, but you can always call Martha in the morning. The toll free number is at the top of the webpage. 73, Drew KO4MA Sent from my iPhone On Jan 11, 2012, at 7:19 PM, Ted k7trkra...@charter.net wrote: I need to purchase a key for PCSat The link to the AMSAT Store is not working.. Where else can I go, pse? TK, K7TRK ___ Sent via AMSAT-BB@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 ___ Sent via AMSAT-BB@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
[amsat-bb] Re: SatPC key?
Got an answer and solution.. No need to reply Tnx, Ted, K7TRK -Original Message- From: amsat-bb-boun...@amsat.org [mailto:amsat-bb-boun...@amsat.org] On Behalf Of Ted Sent: Wednesday, January 11, 2012 4:20 PM To: amsat-bb@amsat.org Subject: [amsat-bb] SatPC key? I need to purchase a key for PCSat The link to the AMSAT Store is not working.. Where else can I go, pse? TK, K7TRK ___ Sent via AMSAT-BB@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 ___ Sent via AMSAT-BB@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
