All, The L band test with ISS scheduled for Dec 28-Jan 3 will require doppler correction. (see below) I have plotted an approx. doppler correction for those who aren't using auto correction. This is based on a 10 minute pass and is timed from AOS to LOS with the Frq that has to be added or subtracted to the base Frq of 1269.650 MHz. each minute. AOS = +30.000 KHZ 1min. = +29.900 2min. = +29.300 3min. = +27.800 4min. = +22.000 5min. = 00.000 6min. = -22.000 7min. = -27.800 8min. = -29.300 9min. = -29.900 LOS = -30.000
This chart is approx only but should work for most
Regards Tony. VK5ZAI
J.A.(Tony)Hutchison P.O.Box 470 Kingston SE South Australia 5275
National ARISS Co-ordinator and Satellite Earth Station.
Web Site :- http://www.electric-web.org Also click on :- http://www.google.com.au/search?hl=en&q=%22vk5zai%22&btnG=Google+Sea...
Frank H. Bauer wrote:
All,
As I mentioned on November 29, the ARISS team is currently celebrating 25 years of amateur radio operations from space. This e-mail describes some of the planned set of special event opportunities for the remainder of the month of December and the beginning of January. To date, the ISS crew has configured the radio to support cross-band repeater operations, they have supported some SSTV downlinks and we have had the opporunity to participate in a special test of 9600 baud packet radio operations on the simplex frequency of 145.825 MHz. This week through December 19, we expect the ISS Ham radio system to be on the 145.825 MHz frequency supporting 1200 baud packet. If PCSAT is configured during the week, double hop APRS is possible.
Dec 21-26 we plan to support the Crossband repeater mode with a twist. Our intent is to configure the radio for 145.99 MHz uplink including PL tone of 67.0 and 437.80 MHz down. This will be performed in low power mode. We should also note that an EVA is planned for that week. Expedition 18 Commander Mike Fincke and Flight Engineer Yury Lonchakov plan to perform a spacewalk on December 22. As per standard procedure, the ISS Ham radio system will be turned off for the EVA.
Dec 28-Jan 3 we plan to reconfigure the Crossband repeater for a special experiment. This will be a test of our L-Band uplink capability, which, to date, has not been proven out. Plan for an uplink of 1269.65 MHz and and downlink on the standard frequency 145.80 MHz using low power. Given the subtantial cable losses of the L-band system, we hope some "big guns" are able to penetrate through, keep up with doppler, and make the connection.
A special certificate is being developed for those who communicate with the ISS. This certificate will be awarded to those that have had 2 way communications with the ISS on Voice, Packet (APRS), or through the voice repeater. And those that have heard the ISS from space in any of the ARISS operations modes (Voice, SSTV, School Contact, Voice Repeater, Digital). Valid dates to qualify for certificate: November 30 to January 15.
To receive the certificate: A) Please note on your QSL the ARISS mode of operation (e.g. SSTV, voice, school, etc) and whether the contact with you was 1 way (receive only) or 2 way. B) Send your SASE to the normal ARISS QSL volunteer distributor in your area of the world. C) On the outside of the QSL envelope, please include the words "25th Anniversary Certificate" D) Make sure your envelope is big enough to accept an 8.5 by 11 inch certificate and includes the proper postage. E) Go to www.ariss.org if you do not know where to send your QSL and please use one of the standard international QSL distributors that are noted on the Web page. Important note: We will be sending your certificate to the volunteer distributors in bulk AFTER the event is over. (This saves workload and money). So do not expect to see it until 1-2 months after the event closes on January 15. We will provide more updates in the near future. We would like to remind everyone that ISS flight requirements related to EVA and vehicle activity may require the radio to be off for some portion of this schedule. And school contacts and general QSO opportunities by the crew will also preempt this schedule for short periods of time. (But remember that if you hear these, you still qualify for a commemorative certificate).
Enjoy the ARISS ops on ISS! 73, Frank Bauer, KA3HDO AMSAT-NA V.P. for Human Spaceflight Programs ARISS International Chairman
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