Hello Rupesh, > Even though we try to digipeat and data is transmitted, we > are not able to receive data on the software screen. whenever > we have a pass of ISS some signals are detected and a receiving > led glows even in squelch on.
The new ARISS web pages at http://www.ariss.org are one place to find more information. Select the 'Contact the ISS' link in the top row. This brings you to a page which describes all of the ARISS amateur radio modes. There is a section on this page titled "Packet Operations". AGWPE only passes the packets that have the correct checksum. Otherwise you will not see the packet displayed via UISS even though it sounds like a good signal. I am not at all familiar with the operation of the TS-2000 internal modem. If it operates in a mode similar to other TNC-2 configurations you might be able to see non-checksum-computed packets using the TNC's PASSALL command. In this configuration you would not be using AGWPE. Packets received with PASSALL = ON contain the good characters and erroneous characters - but it is often good enough for humans to understand the content. Both types of packet operation, hardware TNC and soundcard modem, are discussed in a link in the ARISS.org's packet operations section. The only amateur radio presently in operation on the ISS is the Ericsson HT. The 5 watt downlink and shadowing from the spacecraft structure (depending on the orientation of the ISS) leads to varying signal strengths at the ground station. A real-time packet log of the 145.825 ARISS signals that have been satgated displays at http://www.ariss.net which is a different page from the ariss.org page I mentioned. If there are no satgate stations near you in India then this may not show much except to gauge prior packet activity on orbits approaching your QTH. Hope this helps some ... -- 73 de JoAnne K9JKM k9...@amsat.org Editor, AMSAT Journal _______________________________________________ Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
