June 2009 - AMSAT-BB - mailman.amsat.org

Re: AMSAT-India VO-52 Award
by Rodney Waln 03 Jun '09

03 Jun '09

mine arrived today also, very nice, and thanks for providing vo-52 (hamsat) for all hams to enjoy,

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N3TL
by Peter 03 Jun '09

03 Jun '09

Tim, We enjoyed listening for your signal on AO-7 today, you embody the spirit of adventure and experimentation that gave rise to AMSAT and the Satellite program. Tim, it is a learning experience for all of us to be part of your expanding the horizons of possibility, thank you and keep exploring and asking, why not! 73, Pete, WB2OQQ

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AO-7 Milliwatt Report
by n3tl＠bellsouth.net 03 Jun '09

03 Jun '09

Hey everyone, My thanks to K8YSE, who heard my faint CQ on AO-7 at 13:16 UTC this morning and called me. We had a contact that lasted about a minute with a few exchanges, which is really a thrill here because I was transmitting a half-watt out on a Yaesu FT-817ND. As I suspected from the "test run" the other night, my setup here requires that AO-7 reach roughly 50 degrees elevation before I can hear myself at all on this lowest-of-all power settings for my SSB/CW satellite station. I also suspect I can lower that elevation some by working CW instead of SSB, and I intend to find out on the next really high pass over me. Thanks, too, to Rick, WA4NVM, Pete, WB2OQQ, and others who were listening for me on the pass. By and large, the AMSAT community comprises wonderful folks who are always willing and enthusiastic to help out whenever I get a wild hair to try something on the satellites. I appreciate all of you very much. 73 to all, Tim - N3TL

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LabJack problem
by Steve kb9ups 03 Jun '09

03 Jun '09

Hello All, When connecting the LabJack/piggy back unit to NOVA I get "Devise not reconized" ? Using Windows XP. Can someone help? Steve/kb9ups ARISS Mentor AMSAT area coordinator, Toledo, Oh. AMSAT area coordinator, Streator, IL. www.qsl.net/kb9ups ------------------------------------------------------------ Credit Report Click to find information on your credit score and your credit report. http://tagline.excite.com/fc/FgElN1gywKiP9qJujeYtFEFwyCxmTTi5Z7AmJ2pEu1L9Jb…

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Re: true duplex radios
by Mark L. Hammond 03 Jun '09

03 Jun '09

Nice work, Andrew. Somebody mentioned the Kenwood TS-790A/E previously (a base unit), but I don't think I see it on your current list. It's an important addition :) 73, Mark N8MH > Message: 1 > Date: Mon, 1 Jun 2009 18:21:11 -0500 > From: Andrew Koenig <ke5gdb(a)gmail.com> > Subject: [amsat-bb] Re: true duplex radios > Cc: amsat-bb(a)amsat.org > Message-ID: > <2f52b89b0906011621x4b3e196am67c249935884539f(a)mail.gmail.com> > Content-Type: text/plain; charset=UTF-8 > > Here's my attempt of to update the list of full duplex capable radios. Did I > miss anything? > > > HTs - > Icom IC-W2A > Icom IC-W31A > Icom IC-W32 > Icom IC-Z1A > Icom IC-X2A (440MHz/1.2GHz) > Yaesu FT-470 > Yaesu FT-530 > Yaesu FR-51R > Kenwood TH-D7 > Kenwood TH-75A > Kenwood TH-77 > Kenwood TH-78 > Alinco DJ-G5T > Alinco DJ-580T > Alinco DJ-G7 > > > Mobile rigs - > Kenwood TM732 > Kenwood TM733 > Kenwood TM741 > Kenwood TM742 > Kenwood TM941 > Kenwood TM942 > Kenwood TM-D700/710 > Yaesu FT-4700 > Yaesu FT-5100 > Yaesu FT-5200 > Yaesu FT-8800 > Yaesu FT-8900 > Icom 2728H > Icom IC2800 > Icom IC-2340 > Icom IC-2720 > Icom IC-2820 > Icom IC-Delta-100 > Heathkit HW-24/HW-24A > > Base rigs - > Yaesu FT-726 (with OSCAR Module) > Yaesu FT-736 > Yaesu FT-847 > Kenwood TS-2000 > Icom 820 > Icom 821 > Icom IC-910H > Icom IC-970 > > -- > Andrew Koenig > KE5GDB

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Full Duplex vs Cross Band - definitions
by jrivett＠drivehq.com 03 Jun '09

03 Jun '09

Hi Sil, In the world of data comms (not radio), the meanings of terms are generally as follows : Simplex = One direction only ( A to B only, never in the other direction ) eg a broadcast, NOAA WX stations, etc HDX Half Duplex = Alternating on both directions, e.g A to B, turnaround, B to A, turnaround, A to B, and so on ..... FDX Full Duplex = simultaneously in both directions at same time, A to B AND B to A. For Simplex and for HDX only 2 wires (baseband) or 2 FSK frequencies are enough. TX and RX dont clash, because they are used Alternately, like a single track railway. Turnaround Time was always an important factor, because it slowed down the total amount of data transferred per hour, and required careful synchronisation of modem turnarounds at both ends. For Full Duplex FDX you need a 2 track railway, or 4 wires, or 4 FSK frequencies, which can send and receive at the same time, for trains to go in both directions, for cars to pass on an an ordinary road, for data to pass (ignoring phase modulation and other techniques.) Simplex, HDX and FDX have nothing to do with Cross-Band working. Cross-Band is a completely separate and additional requirement. FM Repeaters often are FDX with frequencies only 600 khz apart, which is Same-Band FDX in the repeater-radio (and used in HDX mode by human users with HDX radios). Humans using Satellites at VHF and UHF for Simultaneous Up and Down links, require radios with FDX and Cross-band functions. To summarise, for sat operations, two different functions are required of a radio, FDX and Cross-Band working. Combining these 2 separate function names into one name seems to confuse the matter. 73 de M3RRX

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AMSAT-India VO-52 Award
by n3tl＠bellsouth.net 03 Jun '09

03 Jun '09

Hey everyone, My VO-52 Award arrived in today's mail, and it's very, very nice. It's printed on a very heavy stock and is very attractive. I look forward to getting it in a frame and on display asap. My thanks to everyone at AMSAT-India for their efforts to make the award available, and for providing great operating via VO-52. 73 to all, Tim - N3TL

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Re: true duplex radios
by k0vty＠juno.com 02 Jun '09

02 Jun '09

Hi Alan Memories: 14 March 1965, My first Satellite QSO. OSCAR III went up on March 9 1965 and the battery lasted 18 days. After two year of designing and building for this day I made my first satellite QSO (CW) 1965 was a much different time for 2 meters and all that went along with that frequency There was three of us on 2 meters locally in those days, Frank (W0EMS), Omaha, NE , Sid (K0DOM), Lincoln, NE and myself, Joe (K0VTY) , Ithaca , NE. Sid was working for Hygain and Frank only worked 2 meter cw. Sid and I had been bitten by the satillite bug and Frank just wanted to watch. Evening gab fests on 2 kept us all on track. My 2 meter preamp design using a pair of 7077's ceramic tubes and a pair of 11 element HB yagi's made up the Oscar III LEO receiving station. A 6360 electron tube transmitting converter (28 to 144) for SSB and CW ( Halicrafter HT-37 driver) worked FB. Antennas were at 40 feet fully AZ and EL hand controlled. In those days there were no computer to do the things done today. The second pass that evening went over Utah. On 144.108, at 0839z K0DOM responded to my CQ. We lost the bird as it passed over Alaska I recorded the audio so we could play it back to Frank and Sid after each pass whether we made contact or not just to listen to the other guys trying to work the bird. Those were the good old days when the only tracking method was using half a Globe sitting on a board so it would pivot and align the Longitude on the globe to a mark on the board where longitude equator crossing times could be used as published for OSCAR III. Amateur satillite activity progressed rapidly with DX being the driver using HEO birds. When the cold war found need for a right now communications need between Washington and Moscow the Molniya orbit was developed so satellite communication could be provided. If it worked for that it likewise would work for Hams on a HEO bird, 63.4 inclination. It took a while to get there but it was a great run of amateur radio enjoyment. Lots of Amsat membership, many inovation all the time. Publication for satellite DX monthly with Satellite Orital elements to use for tracking One Publication , Oscar Satellite Report , a commercial pubication made Satellite DX prime. AO-40 was to be the cream of the crop, and it surely was in design. At my age I no doubt have seen my last HEO DX QSO . Especailly those QSO's that come after you already have over 200 intities comfirmed and those left out there are the entties that lie near the horizon at 8000 plus miles away and the hole in the tree has to line up just at the right time on that orbit for a few moments. I have rambled on but that is what you get by providing old memories of OSCAR III Thanks Alan and 73's Joe K0VTY ======================== On Tue, 2 Jun 2009 15:24:30 -0500 "Alan P. Biddle" <APBIDDLE(a)UNITED.NET> writes: > A good discussion of OSCAR III here: > > http://projectoscar.files.wordpress.com/2008/03/o3_translator.pdf > > Alan > WA4SCA > > > > _______________________________________________ > 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 > > ____________________________________________________________ Get a life insurance quote online. Click to compare rates and save. http://thirdpartyoffers.juno.com/TGL2141/fc/BLSrjpTQcxIRMCS578qk759xFi6j2gE…

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Portable QSLs
by Justin Pinnix 02 Jun '09

02 Jun '09

If you are operating away from home and want to send out QSL cards, is it acceptable to use your "home" card and note corrections to the location? Can I just put "portable FM17" in the notes field? Should I strike through my home grid? 73 AJ4MJ/P FM25 (15 May - 17 May 2009) AJ4MJ/P FM07 (30 May - 1 June 2009) AJ4MJ FM05 (otherwise)

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AO-7 at 13:15 UTC on 3 June
by n3tl＠bellsouth.net 02 Jun '09

02 Jun '09

Hey Everyone, I just looked at tomorrow's passes of AO-7, and the one that will have me in the footprint beginning at about 9:06 Eastern Daylight Time (13:06 UTC) hits a maximum elevation of 87.5 degrees. Beginning at about 9:15 EDT (13:15 UTC), I'm going to be calling CQ and/or looking for contacts near mid passband, between 145.950 and 145.951. I'll be running 500 mW rf out, and would really enjoy getting a contact or two on AO-7 using total flea power. Thanks in advance to anyone who is on the pass and might listen for N3TL. 73 to all, Tim - N3TL

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