May 2007 - AMSAT-BB - mailman.amsat.org

Get your AO51 mode requests in!
by Andrew Glasbrenner 22 May '07

22 May '07

I've put together a preliminary schedule for June, so if you have any further requests please get them to ao51-modes(a)amsat.org in the next 48 hours or so. I have requests for 2 different hamfests, the ARRL Kids Day event, and of course Field Day. I expect to have the schedule posted for June by this weekend. We may run some more L/U on 435.150 along with the normal repeater for FD practice at the end of this month also. 73, Drew KO4MA AMSAT-NA VP, Operations

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LVB Tracker boards and boxes
by Gould Smith 22 May '07

22 May '07

Hello All, Howard Long's LVB Tracker boards were a huge success at Dayton. We are exploring offering more options in response to requests from people in Dayton. Possible combinations are: 1) bare board with info CD 2) board and parts kit w/ LCD 3) built board 4) built board in an enclosure So, what I need is feedback on what the satellite users would rather have. The bare main board/CD would be probably $25 Parts kit around $75 Parts kit plus the board/CD around $100 Built board around $120 Unit in enclosure around $150 These are approximate prices, we need to explore further what the final cost will be. We will decide what to offer depending upon the responses received. Let me know what you would like to have available. 73, Gould, WA4SXM wa4sxm(a)amsat.org

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Epoch time of Keplerian elements.
by HEYLER YESID LEDEZMA LEUDO 22 May '07

22 May '07

Hi. Excuse me for my defective English. One more time I write for ask you something about keplerian elements: ¿The epoch time calculated in Keplerian Elements is a Julian date or is a Gregorian date?. I think than is a Greogorian date, but I am not sure. Thanks for your information. Heiler Yesid Ledezma Leudo. Investigador: Proyecto Espacial Colombiane Órbita Heiler Yesid Ledezma Leudo. Estudiante de Tecnología Electrónica -U. Distrital. --------------------------------- Do You Yahoo!? La mejor conexión a Internet y 2GB extra a tu correo por $100 al mes. http://net.yahoo.com.mx

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TE Systems Amplifiers
by Jim Jerzycke 22 May '07

22 May '07

Greetings all I picked up two TE systems amps at my club's white elephant sale, and don't know much about them. I can't seem to find a TE Systems website, and haven't had time to look through my old QSTs for an ad so I can tell what drive levels and power output these produce. Does anybody know of a site that has the specs for these? 2M amp: 1412G 70cm amp: 4412G tnx es 73, Jim KQ6EA

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75 ohm CATV Cable on 70 cm
by Mike Miller 22 May '07

22 May '07

Anyone have any experience using 75 ohm CATV cable on 70 cm? Mike KA5SMA

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75 ohm CATV Cable on 70 cm
by Fred A Parker 22 May '07

22 May '07

That is what I use. I use it nearly exclusively for my complete station. Have to use crimp on connecters because it has aluminum shield. If it gives me any mismatch I just trim the length. Remember if the feed line is cut to an electrical half length the input impedance equals the output impedance. The stuff I use I purchase from a local hardware store. It is sold for satellite TV hookup and is rated for up 2.5 GHZ. Cost locally is about .10 cents a foot. Just do not try and use high power while transmitting with it. Fred (KF0AK)

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Re: 75 ohm CATV Cable on 70 cm
by Fred A Parker 22 May '07

22 May '07

I run up to 100 watts with no trouble. To get a good match. Put a dummy load on the end of the cable and keep trimming it say six inches at a time until you get a good match . Remember if the cable is cut to 1/4 wave length or odd multiple thereof it is the worst condition you can have. While 1/2 wave length or even multiple thereof is ideal. Or you could try and put some torrid beads on the end of it to help control the rf feedback back down the line. Remember this line is not designed for the high voltages you get with high swr. Fred KF0AK

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CAPE telemetry May 21, 2007
by Mike Rupprecht 21 May '07

21 May '07

Hi, 2040UTC k5usl 3 000000010000 2042UTC k5usl 1 9c00d1d200000900 2045UTC k5usl 2 ffffe7e8eaf4dc00fd 2047UTC k5usl 3 003700240e00 2050UTC k5usl 1 9d00ffff00000000 2052UTC k5usl 2 fdfff2f8f7fce200fc ---------------------------------------------------------------------------- ---- Beacon 1: 9c00d1d200000900 Beacon 2: ffffe7e8eaf4dc00fd Beacon 3: 003700240e00 MPB Voltage : 3,12 V HPB Voltage : 0 V Battery 1 Voltage : 4,18 V Battery 2 Voltage : 4,2 V Batt 1 Current gener : 0 mA Batt 1 Current absorb : 0 mA Batt 2 Current gener : 9 mA Batt 2 Current absorb : 0 mA Temp Battery 1 : -1 °C Temp +X face : -1 °C Temp -X face : -25 °C Temp +Y face : -24 °C Temp -Y face : -22 °C Temp +Z face : -12 °C Temp -Z face : -36 °C Temp RF Amp : 0 °C Temp Battery 2 : -3 °C Panel +X face : 0 mA Panel -X face : 550 mA Panel +Y face : 0 mA Panel -Y face : 360 mA Panel +Z face : 140 mA Panel -Z face : 0 mA 73, Mike DK3WN

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Yaesu G-450 Computer Interface
by Sion Chow Q. C. (9W2QC) 21 May '07

21 May '07

Dear All, I have an old Yaesu G-450 rotator that I plan to put into use by mounting a rotary dipole for 10M terrestrial and satellite use. However, this rotator does not have any form of computer interface. There seems to be a few third party solutions to this problem but however, before I make a decision, I would like to know what the community has been using. Also how well will a rotary dipole work with the Mode-A satellites such as AO-7? Of course it can only track the satellite in azimuth. Thank you very much in advance. 73, Sion Chow Q. C., 9W2QC.

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TE Systems Amplifiers
by Jim Jerzycke 21 May '07

21 May '07

Thanks you everybody for responding! I now have a copy of the information I was looking for, along with the months that QST ran the ads. I'll reply personally to everyone Monday, but it's past my bedtime tonight. 73, Jim KQ6EA

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