[amsat-bb] Re: Mount an Arrow on rotator with 2m vertical orhorizontal
Hi Douglas, Using two identical 50 ohm coax lenght you can't transform each 50 ohm antenna impedance into 100 ohm but if you connect both 50 ohm coax cables to a T connector than the resulting impedance at the common output of the T connector will be 25 ohm i.e. two 50 ohm impedances in parallel and your radio will see a VSWR of 50/25 = 2 and this is the reason it will not work ! BTW if you connect the above 25 ohm impedance to the input of a 1/4 electrical wavelenght long coax cable of 36 ohm impedance than at the output of it you will get an impedance of 36^2 / 25 = 52 ohm toward the main feed line with a good VSWR of about 1 in TX and RX To build a 1/4 electrical wavelengt long of a transmission line of 36 ohm impedance you can connect in parallel two 1/4 electrical wavelenght of 75 ohm coax cable like RG-59 or RG-11 i.e. 34,13 centimeters or 13,38 inches long for 145 MHz BTW in this situation if both antennas are mounted in parallel one Vertical and the other one Horizontal and if the elements are mounted on the same plain with respect to the space than the resulting polarization of the radiated field can be at 45 degrees like \ or at 135 degrees like / depending at wich side of the dipoles the inner conductors of the 50 ohm feed lines are connected. 73 de i8CVS Domenico - Original Message - From: Douglas Phelps dphel...@ameritech.net To: R.T.Liddy k...@ameritech.net; amsat-bb@amsat.org Sent: Tuesday, April 16, 2013 8:31 PM Subject: [amsat-bb] Re: Mount an Arrow on rotator with 2m vertical orhorizontal Any reason why, using identical coax lengths, you could not transform the impedance to 100 ohms and then use a T connector to sum both antenna signals and achieve 50 ohms to the radio? I know Transmit power will be 3 dB down at either antenna but is there any reason it will not work? Any antenna gurus out there? ___ 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] TH-D7 in kiss mode
Hi All, I’m a little bit disappointed. I try to use my kenwood TH-D7 in kiss mode. When I send an APRS packet via [BCON] of my second kenwood TH-D7, I receive this packet with my first kenwood TH-D7 operating in kiss mode but without the flags (0x7E). Here is an example of what I received in Hex Format. C0 20 A6 A6 60 A6 A0 A8 60 82 82 82 60 40 40 E0 A4 8A 98 82 B2 40 60 AE 92 88 8A 40 40 61 3 F0 27 7C 26 22 6C 20 1C 5B 2F 3E D C0 Same thing when I’m transmitting. I send the previous packet via the serial port without the flags, and I received it perfectly with my handheld TH-D7. I’m asking if my kenwood TH-D7 operating in kiss mode removes those flags before sending the packet via the serial interface, and adding them before sending the packet via RF? Or simply replace the flags with FEND? How the kenwood TH-D7 operating in kiss mode deal with FEND character inside the message? Should I replace the FEND with the two byte sequence FESC TFEND or the TH-D7 do it himself? 73's CN8XS ___ 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] AMSAT/TAPR Joint Hamvention Banquet Menu Announced
Join us at the Dayton Hamvention this year for the AMSAT/TAPR Banquet on Friday evening, 17 May. The Evangelist's Dilemma: Driving New Ideas With Nothing But Words. Bruce Perens, K6BP, presents a humorous history of technology evangelism and the things that inevitably go wrong, drawing from his history with Open Source, No-Code, Software Freedom, Codec2, and Open Hardware, and introducing a few of the new battle grounds. Dinner Menu Roast Prime Rib of Beef Marinated Roasted Garlic Chicken Breast in lemon butter sauce Italian Style Lasagna Petite Double Stuffed Potatoes Fresh Steamed Broccoli Onion and Chive Red Potato Vinaigrette Fresh Garden Toss Salad w/ dressings Fresh Fruit Bowl Rolls and Butter Assorted Pies Coffee, Decaf, Iced Tea, Hot Tea, and Water The dinner will be held at: The Kohler Presidential Banquet Center 4548 Presidential Way Kettering, OH 45429 Doors open at 1830 for a cash bar, with buffet dinner served at 1915. Orders must be placed in advance through the AMSAT Store (via AMSAT.ORG) or through the AMSAT Office. Tickets will not be sold at Dayton, but tickets purchased online may be collected at the AMSAT booth. Orders must be placed by Tuesday, May 14th. $30 per person ___ 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] PhoneSat-1 Launch Scrubbed Today
Hello: SCRUBBED. The Orbital launch team is securing today's countdown after this unexpected technical problem arose. Officials are assessing the plan ahead to reattach the umbilical and determine when the next launch attempt can be made 73 Pete WB2OQQ ___ 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] Fwd: Re: Fwd: [Tracking] PhoneSat launch April 17th! 437.425MHz
Update: If launch is successful, deployment will be in T+10 or so, a fairly rapid deployment! First transmissions shortly thereafter! I think that means a lucky radio station over which the spacecraft will be flying (possibly, Pacific Rim/US West Coast) will be getting first transmission shortly (in five/six hours) from now. http://spaceflightnow.com/antares/demo/launchtimeline.html Remember the birds are sequenced: I love their names, Alexander Graham Bell Google's search on Alexander Graham Bellhttps://www.google.com/webhp?sourceid=chrome-instantion=1ie=UTF-8#hl=engs_rn=9gs_ri=psy-abtok=h_X6SRYSBLG9YQDcKj46Sgcp=21gs_id=24xhr=tq=alexander+graham+belles_nrs=truepf=psclient=psy-aboq=alexander+graham+bellgs_l=pbx=1bav=on.2,or.r_cp.r_qf.bvm=bv.45368065,d.dmQfp=35a609f5c41a95edion=1biw=1280bih=899 The two PhoneSat 1.0 satellites, Graham and Bell, transmit with a periodicity of respectively 28 seconds and 30 seconds. The PhoneSat 2.0 beta satellite, Alexander, transmit with a periodicity of 25 seconds. 73 de N3RDX Tip: Register your ham station/radio station at http://www.phonesat.org also a tip from the Phonesat team: You need to decode the sound to Ascii first. If you can do this, then use the decoder from the website. If not, just send us the Audio and we will do it. The Phonesat Decoder is accessible online from the website, nothing to download. -- Forwarded message -- From: Samudra Haque samudra.ha...@gmail.com Date: Sun, Apr 14, 2013 at 10:58 AM Subject: Fwd: [amsat-bb] Re: Fwd: [Tracking] PhoneSat launch April 17th! 437.425MHz To: Amsat-bb amsat-bb@amsat.org Hello AMSAT community some hams have requested information about the upcoming Phonesat mission telemetry format. This is a challenging objective for those who can track and monitor: there are 3 satellites being deployed from the same P-POD and will be released within moments of each other. The systems are timed to not overlap individual station transmissions, so in a single pass, all three should be heard. For any technical questions, please contact the POC, Oriol Tintore of Phonesat. His contact info is below. 73 de N3RDX Oriol Tintore Aerospace Engineer PhoneSat Project, NASA Ames Research Center c: 650-215-0376 o: 650-604-2710 oriol.tintoregazu...@nasa.gov -- Forwarded message -- From: Wolfe, Jasper Lewis. (ARC-RD)[Stinger Ghaffarian Technologies Inc. (SGT Inc.)] jasper.l.wo...@nasa.gov Date: Wed, Apr 10, 2013 at 3:05 PM Subject: Re: [Tracking] PhoneSat launch April 17th! 437.425MHz Cc: Guillen Salas, Alberto (ARC-SST)[Stinger Ghaffarian Technologies Inc. (SGT Inc.)] alberto.guillensa...@nasa.gov**, Tintore Gazulla, Oriol (ARC-TH)[Stinger Ghaffarian Technologies Inc. (SGT Inc.)] oriol.tintoregazu...@nasa.gov Hello CubeSats and Amateur Radio Operators! The very first PhoneSat’s will be launching aboard the Antares on April 17 th at 1700 EDT (launch window to April 19th possibly further). We have manifested 2x PhoneSat 1.0 and 1x PhoneSat 2.0 Beta. ** ** Our orbit is very low (270km x 300km 51.6deg) and we’ll only be up there for 2 weeks! So we’re looking for as many people as possible to help with tracking our satellites! ** ** If any of you are interested in tracking the satellite please let myself (+the cc’d team) know – your help will be greatly appreciated! ** ** All three satellites will be transmitting on *437.425MHz* and TLE’s + more info can be found at www.phonesat.org – consolidated info sheet attached.*** * ** ** Feel free to tune-in and submit packets to www.phonesat.org ** ** Cheers! PhoneSat Project NASA ARC ** ** ___ 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] Next Launch Attempt For Antares
http://spaceflightnow.com/antares/demo/status.html http://www.orbital.com/NewsInfo/MissionUpdates/Antares_Test_Flight/ Weather permitting, it'll be Friday at 2100 UTC. 73s Bernhard VA6BMJ @ DO33FL ___ 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
