[amsat-bb] Fractal Antennas?
This seems almost too good to be true. Keep in mind that I'm not an engineer. Maybe this technology could be used for future amateur satellites, wider bandwidth, more gain, less space, etc. http://www.fractalantennas.com/ Dave Marthouse N2AAM dmartho...@gmail.com ___ Sent via amsat...@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] KP4TR & KP4WK working K4T at the Satellite Playground
KP4WK and KP4TR video working K4T via AO-51 satellite: http://www.youtube.com/watch?v=W28hsdxtYaY ___ Sent via amsat...@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] Successful Static Firing Of Falcon 9 Engines
http://spaceflightnow.com/falcon9/001/100313staticfire/ 73s Bernhard VA6BMJ @ DO33FL __ The new Internet Explorer® 8 - Faster, safer, easier. Optimized for Yahoo! Get it Now for Free! at http://downloads.yahoo.com/ca/internetexplorer/ ___ Sent via amsat...@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: Playing With Lightning
- Original Message - From: "Joel Black" Cc: "'AMSAT'" Sent: Saturday, March 13, 2010 10:44 PM Subject: [amsat-bb] Playing With Lightning > I certainly appreciate all the replies and the encouragement. > > If any of you with a G-5400 controller would check something out, I'd > appreciate it. When I move up or right, there is a momentary deflection > in the opposite direction. Then, when I release the button, it jumps > ahead a bit by just a few degrees. If I move down or left, there is no > immediate deflection, but when I release the button, it deflects in the > opposite direction. I just don't remember mine acting that way before > the strike. > > Thanks, > Joel, W4JBB > Hi Joel, W4JBB Trouble-shooting for your G-5400 I suggest you to momentarily disconnect the wires A1-A2-A3 going from the rear of the control box up to the rotator. Connect temporarely for test a 500 ohm wire wound potentiometer to terminals A1-A2-A3 of the control box taking into account that A2 is the wiper of the potentiometer. Power supply the control box and rotate very slowly by hand the shaft of the potentiometer. If the pointer of the azimut instrument follows accordingly your rotation by hand than there is no damage into the control box. Repeate the same procedure for the wires E1-E2-E3 to test the elevation remembering that E2 is the wiper of the potentiometer. If the pointer of the elevation instrument follows accordingly your by hand rotation of the potentiometer then there is no damage into the control box. If the deflection of the instruments is still like you describes probably the integrated circuits C3 and C4 into the control box where damaged by the strike. Reconnect the original wires between the rotator and the control box and using a high impedance DC voltmeter measure the voltage between A2-A3 and E2-E3 While rotating the antennas left and righ and up and down observe if the voltage follows smootly the above rotation. If the voltage jumps there is probably a damage into the potentiometer wipers inside the rotator Check if the voltage between A1- A3 and between E1-E3 is about 6 volts. The voltage must remain constant at about 6 volts rotating the antennas othervise the voltage regulator Q2 was damaged by the strike. Using the above trouble-shooting you can establish if the problem is located into the rotator or into the controlbox or along the wires connecting both. Have fun ! Best 73" de i8CVS Domenico ___ Sent via amsat...@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] Playing With Lightning
I certainly appreciate all the replies and the encouragement. If any of you with a G-5400 controller would check something out, I'd appreciate it. When I move up or right, there is a momentary deflection in the opposite direction. Then, when I release the button, it jumps ahead a bit by just a few degrees. If I move down or left, there is no immediate deflection, but when I release the button, it deflects in the opposite direction. I just don't remember mine acting that way before the strike. Thanks, Joel, W4JBB ___ Sent via amsat...@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] Seeking Input - Possible North Dakota operation
Hey everyone, I'll be making a quick trip to North Dakota tomorrow (Sunday, March 14), and have the possibility of operating portable from DN96. However, the only satellite pass that I know with certainty that I can work is the 0345-ish UTC Monday (Sunday evening in North America) pass of HO-68, which has a maximum elevation of almost 70 degrees to my location in DN96. Alan Kung has asked that the orbit in question be reserved for packet in his latest schedule - and this is where I'm writing to seek input from the operators who will be in the footprint during this orbit. First and most importantly - does anyone need North Dakota and/or DN96? Second - if there IS interest in FM voice contacts during that particular orbit, will any packet operators reading this please respond with your thoughts about having roughly 10 minutes of voice contacts - maximum - during that orbit? I am not checking luggage, so will be carrying only my HT and a whip antenna. Given HO-68's outstanding performance and the path of this pass, I believe I should be able to work the satellite consistently on that handheld station from roughly 0345 UTC to 0355 UTC. I will be happy to activate North Dakota and DN96 if there is interest, and if the packet operators who plan to use HO-68 are OK with this 10-minute window of FM voice operation on Sunday evening. I'll also be happy to avoid the pass if there are major concerns. There is one AO-51 pass, during the 1300 UTC hour on Monday morning, that I may be able to work - but I'm not confident that will be the case. I expect to be in meetings by then, which makes the HO-68 pass in question the only one I am certain I'll be able to work. Please post any input to the BB so that everyone can see any feedback I get. Thanks in advance for your time and thoughts. 73 to all, Tim - N3TL Athens, Ga. - EM84ha ___ Sent via amsat...@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: AMSAT-BB Digest, Vol 5, Issue 117
Hi Bill, Yes, "Digital Transponder" means packet function. Strictly it is not a digital mode transponder on HO-68. It is data store-forward transfer over analog FM RF channel. the link layer protocol based on the AX.25, and applications layer protocol used PACSAT. 73 Alan Kung, BA1DU - Original Message - From: "Bill Dzurilla" To: Sent: Saturday, March 13, 2010 3:29 AM Subject: [amsat-bb] Re: AMSAT-BB Digest, Vol 5, Issue 117 Alan, Thank you very much for your great work with HO-68 and for your effort to solve the voice/packet problem. I do not entirely follow the schedule, however. Does "Digital Transponder" mean packet? Where it says: > 14 Mar. 2010, Digital Transponder > > 16:45...Turn On--Linear Transponder > India, Africa, Middle East, > Europe,NA > 17:30...Turn Off does that mean digital (packet) or linear (SSB)? Does it mean that the linear transponder will be active on 14 March and 15 March and that the rest of thw week is digital only? Please clarify if possible. 73, Bill NZ5N > Message: 14 > Date: Sat, 13 Mar 2010 00:07:41 +0800 > From: "Alan Kung" > Subject: [amsat-bb] HO-68 Schedule - 14-21 Mar 2010 > To: > Message-ID: > <009201cac1fe$35fc6db0$6c01a...@ba1duoffice> > Content-Type: text/plain; > charset="gb2312" > > Hello all, > > I got a lot of responses about problem of digital mode > through HO-68. The main problem is that Packet > communication > is often interrupted by voice. We are trying a new schedule > > in this week, voice and packet operations will be separated > > by the schedule, of course, this just depends on the > hams'own > discipline. If you have any comment and suggestion, please > > let me know. > > > 14 Mar. 2010, Digital Transponder > ___ Sent via amsat...@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] test
test ___ Sent via amsat...@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
