January 2012 - AMSAT-BB - mailman.amsat.org

Probably a silly idea...
by Raidel Abreu Espinet 18 Jan '12

18 Jan '12

Hi all, This is probably a silly idea but who knows.... ARRISat-1 was a wonderfull satellite but with a short life. The ISS instead is a wonderfull platform, of course I know how difficult is to install inside it new radios and antennas for cross-repeaters, but how difficult is really to take a small box and firmly attach it to some low risk part of the ISS, the satellite-box will use its own power solar cells and antennas and the ISS is just the carrier. It may be something silly but probably not difficult, if the astronauts made a "hand launch" with ARISSat-1/KEDR why can not them just hold it with latches in a low risk part of the ISS. Of course if a battery is a risk we can just design a simple system capable of work only in sun light. If you think this is a bad idea, just ignore it, if not, well who knows, may be some day an astronaut attach an small satellite in the ISS side.... 73, Raydel, CM2ESP Este mensaje ha sido enviado mediante el servicio de correo electronico que ofrece la Federacion de Radioaficionados de Cuba a sus miembros para respaldar el cumplimiento de los objetivos de la organizacion y su politica informativa. La persona que envia este correo asume el compromiso de usar el servicio a tales fines y cumplir con las regulaciones establecidas.

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Re: Probably a silly idea...
by Edward R. Cole 18 Jan '12

18 Jan '12

AS I understand there are four antennas on the ISS available for ham use. So why does a package have to go outside? It can be installed inside, use ISS power, be turned on/off by astronauts at will or even unplugged? No batteries, no rocket propulsion, dangerous chemicals, no space-rated enclosure, no EVA. Last time I propose this I was told to shut my mouth and go away. 73, Ed - KL7UW At 08:02 AM 1/18/2012, Trevor . wrote: >PCSAT-2 did exactly that on the ISS in July 2005, however, it was >returned to Earth Sep 2006. > >It requires an expensive EVA to install and there may be frequency >coordination issues with the two amateur radio stations already on the ISS. > >I wonder what the capabilities of the Kibo Robot Arm are ? I believe >it can attach payloads to the exterior Exposed Facility (EF) with >the need for an EVA. > >73 Trevor M5AKA > >--- On Wed, 18/1/12, Raidel Abreu Espinet <cl2esp(a)frcuba.co.cu> wrote: > > > From: Raidel Abreu Espinet <cl2esp(a)frcuba.co.cu> > > Subject: [amsat-bb] Probably a silly idea... > > To: amsat-bb(a)amsat.org > > Date: Wednesday, 18 January, 2012, 16:06 > > Hi all, > > > > This is probably a silly idea but who knows.... > > > > ARRISat-1 was a wonderfull satellite but with a short life. > > The ISS instead is a wonderfull platform, of course I know > > how difficult is to install inside it new radios and > > antennas for cross-repeaters, but how difficult is really to > > take a small box and firmly attach it to some low risk part > > of the ISS, the satellite-box will use its own power solar > > cells and antennas and the ISS is just the carrier. > > > > It may be something silly but probably not difficult, if > > the astronauts made a "hand launch" with ARISSat-1/KEDR why > > can not them just hold it with latches in a low risk part of > > the ISS. Of course if a battery is a risk we can just design > > a simple system capable of work only in sun light. > > > > If you think this is a bad idea, just ignore it, if not, > > well who knows, may be some day an astronaut attach an small > > satellite in the ISS side.... > > > > 73, > > Raydel, > > CM2ESP > > Este mensaje ha sido enviado mediante el servicio de correo > > electronico que ofrece la Federacion de Radioaficionados de > > Cuba a sus miembros para respaldar el cumplimiento de los > > objetivos de la organizacion y su politica informativa. La > > persona que envia este correo asume el compromiso de usar el > > servicio a tales fines y cumplir con las regulaciones > > establecidas. > > _______________________________________________ > > 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 > > > >_______________________________________________ >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 73, Ed - KL7UW, WD2XSH/45 ====================================== BP40IQ 500 KHz - 10-GHz www.kl7uw.com EME: 50-1.1kw?, 144-1.4kw, 432-QRT, 1296-?, 3400-? DUBUS Magazine USA Rep dubususa(a)gmail.com Coming Soon - "Kits made by KL7UW" ======================================

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Re: Model Rocket Booster Engine for Picosatellite
by G0MRF＠aol.com 18 Jan '12

18 Jan '12

Thanks Joe. What an exciting concept. Having got really enthusiastic, I thought I would roughly calculate how high one of these little rockets could raise the orbit. Given that one rocket reload pack has 40 Newtons of thrust and lasts for about one second We have 40 Newton seconds of specific impulse. The mass flow rate is 18.6g in one second or 0.0168kg/s So.....the ISP (a bit vague here) is around 219 seconds (ave thrust / mass flow rate / 9.81ms^2) Which should get a 3.7kg satellite's apogee about..... 40km higher. So...Not enough for P3E then Oh well, not so exciting after all. Time for a beer. 73 David G0MRF In a message dated 17/01/2012 03:56:37 GMT Standard Time, rhyolite(a)nettally.com writes: Has anyone seen this. I am surprised a shuttle mission permitted this type of booster. From what I believed, safety concerns prevented most types of boosters. http://www.rocketryplanet.com/content/view/3706/30/#axzz1jgQ85qx1 -- Joe Leikhim Leikhim and Associates Communications Consultants Oviedo, Florida www.Leikhim.com JLeikhim(a)Leikhim.com 407-982-0446 Note to GMail Account users. Due to an abnormally high volume of spam originating from bogus GMail accounts, I have found it necessary to block certain GMail traffic. Please phone me if you believe your message was not received. _______________________________________________ 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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SKN Participants
by Rsoifer＠aol.com 18 Jan '12

18 Jan '12

Hi, Further to the ANS bulletin, if you worked someone in AMSAT's SKN on OSCAR 2012 and haven't yet done so, please send a Best Fist nomination to me at w2rs(a)amsat.org. Tnx & 73, Ray W2RS

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HI4/AJ5C update for 1-18-12
by Bob Herrell 18 Jan '12

18 Jan '12

Good contacts AO-27 01/18/12 1811z de HI4AJ5C: K9OIM, K4FEG/M, W4MPS, KB0RZD, KD0QAF, KE3LB, WA8SME and KD8QBA. 73, Bob HI4/AJ5C

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Seeking contact info for JA8TCH
by Alan P. Biddle 18 Jan '12

18 Jan '12

Hi, I am looking for information, particularly an email address, for JA8TCH. He(?) was one of the last to receive telemetry from ARISSat-1. Unfortunately there is no listing in English sources such as QRZ.COM, though I got several hits from Japanese language sites, including an Echolink node. Alan WA4SCA

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Re: Model Rocket Booster Engine for Picosatellite
by Joe Leikhim 17 Jan '12

17 Jan '12

Like any design a cost-benefit analysis would be required to determine if the Gatling arrangement is even necessary. I am sure there are about a dozen ways to "skin the cat". (My apologies to my pet cat Mac) On 1/17/2012 11:04 PM, Gary "Joe" Mayfield wrote: > This is a fun thought exercise. The gatling gun is one option. I prefer > something with no moving parts. It should be possible (not easy) to center > one engine on each side. That would be six engines. Once in orbit take the > time to stabilize the satellite along the first axis before firing the first > engine to boost the orbit. Repeat the process up to 5 times. Wow - This is > rocket science! > > 73, > Joe kk0sd > > -----Original Message----- > From: amsat-bb-bounces(a)amsat.org [mailto:[email protected]] On > Behalf Of Joe Leikhim > Sent: Tuesday, January 17, 2012 5:33 PM > To: Ken Ernandes > Cc: amsat-bb(a)amsat.org > Subject: [amsat-bb] Re: Model Rocket Booster Engine for Picosatellite > > I have developed the perfect solution; > > A gatling gun type canister for the rocket motors would solve all of > your objections per below: > > On 1/17/2012 4:22 PM, Ken Ernandes wrote: >> How would attitude be controlled so the thrust is in the correct > direction? Spin stabilization about the maximum moment off inertia axis is > probably the best choice. This would require a magnetic torquing system. > > Yes just like other missions. >> Another issue is the thrust needs to be directed through the spacecraft's > center-of-mass or there will be stability problems. How would a cluster be > fired individually with each, in turn, directed through the center of mass? > That's a complex design problem. > > A motorized canister with 6 to 8 motors aligned such that the active > motor is aligned through the COM. Picture a revolver or gatling gun. >> One more issue is that when you carry multiple motors, the first must > accelerate the mass of the unfired motors, so the early firing will be less > effective. The mass of the spent casings will need to be accelerated buy > the subsequent motor firings. > > Spent casings would be ejected using the ejection charge normally used > for deploying a parachute. Just as with any fuel, the mass of the > unfired fuel will create mass for the initial firings. >> You do have some work to do before you have a practical solution. > Work is done. Took about 4 minutes. Coffee break now! >> 73, Ken N2WWD >> >> Sent from my iPad >> >> >> >> On Jan 17, 2012, at 3:44 PM, Joe Leikhim<rhyolite(a)nettally.com> wrote: >> >>> David; >>> There are some much bigger motors! Ask the Level-3 rocketry folks! Anyway > a cluster of medium sized motors could be fired individually as required to > raise altitude. I would think that SRB's would be more reliable and safer > than hypergolic used on previous Oscars. There would of course be a lot of > heat in the rocket casings that would need to be dissipated. >>> -- >>> Joe Leikhim >>> >>> Leikhim and Associates >>> Communications Consultants >>> Oviedo, Florida >>> >>> www.Leikhim.com >>> >>> JLeikhim(a)Leikhim.com >>> >>> 407-982-0446 >>> >>> Note to GMail Account users. Due to an abnormally high volume of spam > originating from bogus GMail accounts, I have found it necessary to block > certain GMail traffic. Please phone me if you believe your message was not > received. >>> _______________________________________________ >>> 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 -- Joe Leikhim Leikhim and Associates Communications Consultants Oviedo, Florida www.Leikhim.com JLeikhim(a)Leikhim.com 407-982-0446 Note to GMail Account users. Due to an abnormally high volume of spam originating from bogus GMail accounts, I have found it necessary to block certain GMail traffic. Please phone me if you believe your message was not received.

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Re: Model Rocket Booster Engine for Picosatellite
by Joe Leikhim 17 Jan '12

17 Jan '12

David; There are some much bigger motors! Ask the Level-3 rocketry folks! Anyway a cluster of medium sized motors could be fired individually as required to raise altitude. I would think that SRB's would be more reliable and safer than hypergolic used on previous Oscars. There would of course be a lot of heat in the rocket casings that would need to be dissipated. -- Joe Leikhim Leikhim and Associates Communications Consultants Oviedo, Florida www.Leikhim.com JLeikhim(a)Leikhim.com 407-982-0446 Note to GMail Account users. Due to an abnormally high volume of spam originating from bogus GMail accounts, I have found it necessary to block certain GMail traffic. Please phone me if you believe your message was not received.

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You remember KC9ROI braving the cold
by Bruce 17 Jan '12

17 Jan '12

If you remember a few weeks ago KC9ROI braving the cold to work ARISSat-1. I thought that was pretty neat and I had to get a Satellite Communicators Club Certificate to him and what better way than at one of their club meetings. I sent the certificate out the next day for a meeting they had Saturday, Jan 14. They framed the certificate and presented it to him. Here is a picture on their website. http://www.n9xh.org/ You never know where that spark of enthusiasm is, this might just be it. 73...bruce -- Bruce Paige, KK5DO AMSAT Director Contests and Awards ARRL Awards Manager (WAS, 5BWAS, VUCC), VE Houston AMSAT Net - Wed 0200z on Echolink - Conference *AMSAT* Also live streaming MP3 at http://www.amsatnet.com Podcast at http://www.amsatnet.com/podcast.xml or iTunes Latest satellite news on the ARRL Audio News http://www.arrl.org AMSAT on Twitter http://www.twitter.com/amsat

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Re: Radio Pirates
by Gordon JC Pearce 17 Jan '12

17 Jan '12

On 16/01/12 00:27, Ted wrote: > > 'I'd take the cheapie chinese radios any day'. > > Perhaps that is the mentality that makes the EU economic model the mess that > it is today. Also, any, and I mean any economist will tell you that in hard > times the average consumer (which includes notoriously cheap hams) will shop > price above all else. That is why the chinese have everyone by the fortune > cookies... No, it's more to do with the standard of construction, performance and availability of parts and service information. The Chinese are streets ahead here. It's particularly galling when you realise you could buy five cheapy Chinese radios for the cost of one from a major American manufacturer - and still expect to have all five working in two year's time! > ANY of these POS non type certified radios have no place in our community. It's CEPT and CE approved, good enough for me. > But since the US FCC has turned into nothing more than a bunch of political The FCC is not relevant to my interests. I love breaking FCC regulations. -- Gordon MM0YEQ

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