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AO-51 Satellites Schedule for 25th Asia Pacific Scout Jamboree 2005


During 28 December 2005  3 January 2006, Thailand would be the host of 
25th Asia Pacific Scout Jamboree 2005 at Had Tao, Sattahip, Chonburi. see 
more information at http://www.aprjam25.org/

In this event, we would have the communication between special portable HAM 
radio station, with allowance from National Telecommunication Commission of 
Thailand (NTC), with special callsign E25AJ to communicate with all HAM in 
Thailand and international. The highlight event would be the direct 
communication between E25AJ station with an crew on International Space 
Station (ISS) by HAM radio frequency 145 MHz VHF Band.

Thailand Amateur Radio Satellites Corporate (TAMSAT) has an opportunity to 
join this event as helping scouts to use portable HAM radio station E25AJ 
QSO via Low Earth Orbit Satellites (LEO). As we found, at the present, LEO 
Satellites with excellent efficiency is only AO-51 that is belong to yours. 
The efficiency would be best when using in High Power mode as we can found 
from 22 Oct 2005 14:10 UTC E20QVD QSO with 9W2QC HAM of Malaysia with very 
low power 1 Watt
RF power and from 23 Oct 2005 02:30 UTC HS1JAN and E20QVD QSO with HAM of 
Japan, HAM of China and HAM of Thailand with only 5 Watts.

Therefore, as we found the AO-51 Schedule that announced on 
http://www.amsat.org/amsat-new/echo/ControlTeam.php says that after 19 Dec 
2005 the mode of working will be FM Repeater, V/U and 9k6 Digital, V/U, PBP 
BBS. Since the record of communication via AO-51 satellite
in Thailand, including the announcement of frequency usage from NTC that 
allows to receive at 435  438 MHz UHF frequency band only, cannot transmit 
and the Transceiver that can set the PL Tone in Thailand are very few, we 
used to communicate with this satellite by receiving through Satellites 
Gateway Station that use the signal received from Transceiver through UHF to 
VHF Hamtronic Downconvertor to let the signal out by VOIP Echolink program 
at conference room HS0AC or room CHANG, then HAM of Thailand received the 
signal from link that connected in conference to on air in many parts of 

Therefore, with these loads of problem, TAMSAT Group would like to ask you 
that controlling AO-51 for your help by changing mode of AO-51 Satellites to 
be FM repeater, V/U High Power mode and No PL Tone or mode during 28 Dec 
2005 to 3 Jan 2006 as followed :-

28 Dec 2005 - 3 Jan 2006
FM Repeater, V/U High Power Mode
Uplink: 145.920 mhz FM, No PL Tone
Downlink 435.300 mhz FM
FM Repeater, V/U High Power Mode
Uplink: 145.880 mhz FM, No PL Tone
Downlink 435.150 mhz FM

Your kindly help would be very appreciated and most helpful for this event. 
Thank you very much in advance.

Best Regards, QRU 73 DE Tanan Rangseeprom, HS1JAN and TAMSAT Group
e-mail : hs1jan@tamsat.org , web : http://www.tamsat.org or 
Sent via amsat-bb@amsat.org. Opinions expressed are those of the author.
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