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

HO-68 FM/Packet Understanding
by Peter 25 Dec '09

25 Dec '09

Luc, John and the Group, I want to wish everyone a Healthy and Peaceful New Year, and I hope that Santa was good to you; I know Santa gave me a terrific Satellite gift. I asked Alan to give me a better understanding of how signals are processed with XO-68, I hope his explanation below helps. Dear Peter, FM / Digital working principle is that whoever will relay signal to who should transmit first. the transponder is not torn between the uplink signals. In other words, if the voice first, open the repeater and talk, this time where the transmitting packet data is necessary to wait for voice communication before end of the processing voice. By the same token, if you are transmitting Packet data into voice link from time to time, the satellite will continue to transmit the packet data to complete the data frame, and then process voice request if the request is still active. On the other hand, if there are a lot of very strong signals transmit to the satellite at same time, the satellite receiver may be unable to decode 67Hz PL correctly, so voice will be unable to be replied in that case. Happy Holiday! 73 Alan, BA1DU

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HO-68 Beacon Copied in FM19
by Mike Benonis 25 Dec '09

25 Dec '09

I was able to copy the HO-68 Beacon from my QTH in FM19fa using my new Arrow II Handheld Satellite Antenna. I wanted to thank the Chinese AMSAT Folks for a wonderful gift to the amateur satellite community and wish everyone a very merry Christmas tonight. I look forward to many QSO's on this satellite in the coming weeks. 73's de Mike KI4RIX Best regards, Mike Benonis mike(a)benonis.net KI4RIX

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HO-68 Across the pond
by John Meeks 25 Dec '09

25 Dec '09

Many thanks to Amsat China for placing Xwang-1 in such a great orbit. On the 23:20 Linear xponder pass tonight I had the pleasure of working Paul 2E1EUB and Danny ON5UE. Europe was in my footprint here in northern Michigan EN75 for a good long time. Heard a good number of US-EU contacts.on that pass. Well done Alan and the China team. Tnx and 73 KC8ZFN John

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A nice shot
by Rocky Jones 25 Dec '09

25 Dec '09

http://spaceflight.nasa.gov/gallery/images/station/crew-22/hires/iss022e014… this is far easier then the NASA PAO makes it out to be (no it doesnt happen at 17,500 mph) Ivan makes it look very easy...but it is more difficult then they make it look and Ivan does it with grace. This time it is also quite pretty Merry Christmas everyone Robert WB5MZO _________________________________________________________________ Hotmail: Free, trusted and rich email service. http://clk.atdmt.com/GBL/go/171222984/direct/01/

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HO-68
by TERRY BROMLEY 24 Dec '09

24 Dec '09

Tnx Joe K3SZH for our first qso on HO-68 at 23:18 nice christmas box. Terry, G1WPR.

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OBSERVER PROBLEM CORRECTED
by Albert Onley 24 Dec '09

24 Dec '09

TKS AL WHO RESPONDED TO MY OBSERVER PROBLEM IT IS NOW WORKING TKS AL K4VHV HAPPY HOLIDAYS

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AO-51
by Jeff Yanko 24 Dec '09

24 Dec '09

I recall Andrew mentioning that AO-51 had a software crash and he was in the process of reloading it. Just wondering if it's back up yet? And Merry Christmas to all! 73, Jeff WB3JFS

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Re: question (about 435.770)
by Mark L. Hammond 24 Dec '09

24 Dec '09

Hi Nick, I bet you were hearing IO-26 at 1200 baud PSK. I was commanding telemetry requests, so you might have heard a good bit of activity. 73, Mark N8MH __________________________ question -------------------------------------------------------------------------------- Subject: [amsat-bb] question From: "Nick Pugh K5QXJ" <quadpugh@xxxxxxxxxxxxx> Date: Thu, 24 Dec 2009 13:40:07 -0600 -------------------------------------------------------------------------------- What sat is on 435.770 MHz transmitting 400 baud psk . I copied a sat with Doppler at 19:20 Z today. I am located in Louisiana USA I and I don't know what sat it is? Merry Christmas nick

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HO-68 Audio 24December2009 1807z FM/BBS
by John Papay 24 Dec '09

24 Dec '09

An audio recording of the HO-68 pass over the far western USA 24Dec2009 1807z is on my webserver: http://www.papays.com/HO-68_24Dec2009_180656z.mp3 The same scenario continues with packet competing with the voice repeater. How the two work together is not obvious but it does seem that the packet shuts down the voice repeater for a period of time. What makes the voice repeater start up again is not clear. I decoded some packets on this pass. I have the TNC set to Date/Time stamp the packets so we know exactly when they were received. The clock is accurate to within a few seconds. BJ1SA-12>BBSTAT [12/24/09 18:09:38]:Open BJ1SA-12:0 BJ1SA-12>BBSTAT [12/24/09 18:10:02]:Open BJ1SA-12:0 BJ1SA-12>BBSTAT [12/24/09 18:10:26]:Open BJ1SA-12:0 BJ1SA-12>BBSTAT [12/24/09 18:12:27]:Open BJ1SA-12:0 BJ1SA-12>BBSTAT [12/24/09 18:13:03]:Open BJ1SA-12:0 BJ1SA-12>BBSTAT [12/24/09 18:13:15]:Open BJ1SA-12:0 BJ1SA-12>BBSTAT [12/24/09 18:13:39]:Open BJ1SA-12:0 BJ1SA-12>BBSTAT [12/24/09 18:13:15]:Open BJ1SA-12:0 BJ1SA-12>BBSTAT [12/24/09 18:13:39]:Open BJ1SA-12:0 BJ1SA-12>BBSTAT [12/24/09 18:13:52]:Open BJ1SA-12:0 BJ1SA-12>BBSTAT [12/24/09 18:14:40]:Open BJ1SA-12:0 BJ1SA-12>BBSTAT [12/24/09 18:14:52]:Open BJ1SA-12:0 BJ1SA-12>BBSTAT [12/24/09 18:15:28]:Open BJ1SA-12:0 BJ1SA-12>BBSTAT [12/24/09 18:15:40]:Open BJ1SA-12:0 BJ1SA-12>BBSTAT [12/24/09 18:16:05]:Open BJ1SA-12:0 BJ1SA-12>WC7V [12/24/09 18:17:01]:°3K BJ1SA-12>BBSTAT [12/24/09 18:17:05]:Open BJ1SA-12:1 BJ1SA-12>BBSTAT [12/24/09 18:17:54]:Open BJ1SA-12:1 Thanks again to the Chinese Team for a wonderful Christmas present! Merry Christmas. 73, John K8YSE

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Re: one remark of HO68
by G0MRF＠aol.com 24 Dec '09

24 Dec '09

That's an interesting obsevation Dan. If we listen to the pass at 23.15 UTC, the pass is mid Atlantic with good communications between Western Europe and the East Coast of the USA. Italy / Eastern Europe is out of the footprint, so there should be fewer stations on the XW1 uplink. Thanks David In a message dated 24/12/2009 17:42:05 GMT Standard Time, Danny.casier(a)skynet.be writes: Hello satfolks; When i listen to the recording of the activity (12:35z) over Europe of HO68 I hear my calling is shortly interupted just that long of a packet. So I think the input of the transmitter is muted every time a carry is detected. If many try to send packets to the sat normal voice communication is impossible. So my conclussion is: packet and voice mode at the same time is not a good way. Maybe that was the problem of the firsth FM-activity over Europe. Many where trying to work the sat in packet and the input was most of the time muted. Only big gunns could get thru the packets. Merry Christmas. Dan ON5UE

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