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

HF satellite?
by Robert Bruninga 07 Jun '09

07 Jun '09

We are considering an HF transponder for our next long range CUBESAT mission planning. It can have three modes: 1) APRS 1200 baud for command and control and APRS on 145.825 2) PSK-31 multi-user SSB uplink on 29 MHz and FM down link on 145.825 3) 29 MHz uplink and 24 MHz downlink SSB transponder We will welcome someone in the AMSAT community that wants to contribute to mission 3, the HF transponder. We tried the #2 PSK-31 mission on PCSAT2 and RAFT, both failed due to HF antenna deployment problems. Now we are going to try again... Bob, WB4APR

9 12

Re: ... talking HF satellites: RS-15 is still transmitting !
by G0MRF＠aol.com 07 Jun '09

07 Jun '09

What an interesting piece of work on RS15 ! I notice that the graphs for 2009 on the 'solar elevation' page predict that RS15 is in, or shortly will be in, a period of permanent illumination. Perhaps another good example of a satellite with working solar panels that would have benefited from some form of hardware to bypass the command and control circuits when they failed and put the satellite into transponder mode. Thanks Henk David G0MRF In a message dated 07/06/2009 15:59:11 GMT Standard Time, hamoen(a)iae.nl writes: My set-up is really marginal: just a TS2000 connected to a simple 14MHz dipol. ... then: I came across this website, very nice ! http://www.newearth.demon.co.uk/sat/rs15-bbc.htm Henk, PA3GUO http://www.pa3guo.com

1 0

... talking HF satellites: RS-15 is still transmitting !
by Henk, PA3GUO 07 Jun '09

07 Jun '09

Triggered by the discussions on HF satellites ... I did give RS-15 a try this morning and yes, I could hear it ! Still very weak during a 45 degrees elevation pass. The next pass was higher, but then I didn't hear anything. Click here for a screen shot, you will see the recorded signal of RS-15. http://www.pa3guo.com/rs15_beacon_pa3guo_07june2009_0812utc.jpg My set-up is really marginal: just a TS2000 connected to a simple 14MHz dipol. ... then: I came across this website, very nice ! http://www.newearth.demon.co.uk/sat/rs15-bbc.htm Henk, PA3GUO http://www.pa3guo.com

1 0

NORAD TLE file from several GPS positions of a satellite
by SALAH 07 Jun '09

07 Jun '09

Can anybody tell me how to build a NORAD TLE file from several GPS positions of a satellite? Is there any VB6 code to do this? 73's CN8XS

1 0

unknown packet signal information
by David J 07 Jun '09

07 Jun '09

Tim and Mike, Thanks for letting me know it was NO-44. I wasn't tracking it nor setup to demodulate the mode either. Dave

3 2

Re: Homebrew Log Periodic for 2 Meters
by Stephen E. Belter 06 Jun '09

06 Jun '09

> There was a question recently about homebrewing an Elk type antenna. > For those interested, the October 2001 QST had an article for > homebrewing a 6 element 2 meter log periodic antenna by L. B. Cebik. > If you are an ARRL member, you can get the article from their web > site. Although not mentioned in the article, it should also work on > 432 MHz on the third harmonic, but no performance figures are given. > -- Euffey I had a brief conversation with Kent, WA5VJB, at Dayton this year. Our discussion turned to log periodic antennas and operation at the 3rd harmonic. Kent said that the elements need to be "swept" forward in a herringbone pattern for proper operation on the 3rd harmonic. For an example, look at a standard VHF television (log periodic) antenna. The elements of the antenna are quarter-wave for channels 2 through 6, and three-quarter wave on channels 7 through 13. Rather than being perpendicular to the boom, the elements are swept forward. Steve, N9IP

1 0

unknown packet signal
by David J 06 Jun '09

06 Jun '09

I'm in Orlando, Florida. Can someone let me know which satellite I just received around 20:54 UTC on 145.825 MHz running packet? Dave, AA4KN

2 1

Re: RS12/13 Merry Christmas / HNY Message
by Tony 06 Jun '09

06 Jun '09

James, > I don't think the errors are errors at all, but the result of > translating cyrillic spelling I thought it might have something to do with translation. > If I remember correctly, R3X was the robot on board. Thanks for the info James... Tony -K2MO ----- Original Message ----- From: "James Duffey" <jamesduffey(a)comcast.net>

1 0

Re: HF satellite?
by K8KFJ＠aol.com 06 Jun '09

06 Jun '09

In a message dated 6/5/2009 7:39:26 P.M. Eastern Daylight Time, dxdx(a)optonline.net writes: > The RS 12/13 CW robot was a lot of fun too -- have a few recordings Hey Tony ... was that the Russian bird that automatically issued you a QSO number once you made the contact??? 73, Gary -K8KFJ- **************Stay connected and tighten your budget with a great mobile device for under $50. Take a Peek! (http://pr.atwola.com/promoclk/100122638x1221845911x1201401556/aol?redir=htt…)

4 6

Homebrew Log Periodic for 2 Meters
by James Duffey 06 Jun '09

06 Jun '09

There was a question recently about homebrewing an Elk type antenna. For those interested, the October 2001 QST had an article for homebrewing a 6 element 2 meter log periodic antenna by L. B. Cebik. If you are an ARRL member, you can get the article from their web site. Although not mentioned in the article, it should also work on 432 MHz on the third harmonic, but no performance figures are given. -- Euffey

1 0