Hello Kevin, >But none of these have the feature to allow it to search and decide the type >of digital mode it is.
This question is classical and the answer must be always the same. For a precise type of modulation, you could extract some characteristics (speed, shift...). But there is not only one type of modulation nor only one type of coding. You can find BPSK, QPSK, MPSK (as for MT63) MFSK (Olivia...), OOK, IFK (Domino).... Transmission can be analogical or digital. This problem of recognition is extremely complex. Perhaps in 50 years, with powerful neuronal computers, you will have programs which will tell you what modes will be on the band, but for instance it is impossible. Moreover, it would be a lot of work and enginners, and only a company could do this. Now, in Ham radio, we have in several programs (Fldigi, Multipsk) video ID (you see the name of the mode in the waterfall) or RS (Reed Solomon) ID (Identifier) which permits to identify a mode and its frequency (available with Multipsk). But of course you need to send previously to the transmission either the video or the RS ID. 73 Patrick ----- Original Message ----- From: Kevin To: digitalradio@yahoogroups.com Sent: Thursday, February 08, 2007 9:13 PM Subject: [digitalradio] Newbie to DigitalRadio - Couple of Questions Hi All, My name is Kevin, ZL1KFM. I am starting to get back into digital modes after a number of years away from it. Before was mainly on VHF packet. Back then I had a AEA PK-232 multimode modem. Back then I loved this unit for it's many features. One of the features I liked was the ability to have the PK-232 decide what the digital signal was, Packet, Amtor, Rtty etc. Today I am using MixW, and Ham Radio Deluxe, which are great software packages, and have just recently downloaded Hamscope (But haven't tried it yet). But none of these have the feature to allow it to search and decide the type of digital mode it is. Maybe it's the number of different digital modes now out there that make this feature unusable, but is there something out there, or could it be added? Why I ask this is listerning around, I hear what I believe to be a Rtty, PSK or the others (listerned to the tones from some of the web sites) and I can not for the life of me to get them to decode. I even change the modes as it goes to see if this helps, in most cases I am unable to see anything. My success rate s about 20-25% I am using a Kenwood TS-480S, and using the Data connection for RX and TX to the computer. I get a good pattern on the waterfall, and can see strong signals when there. Anyway I will keep trying to get it working, then I will try my hand at transmitting. Thanks for any help you can send my way. Will hopefully get it working 100% soon. Regards Kevin, ZL1KFM
