188-141 does not merit adaptive equalization in my opinion. At 125 tones per second, one of 8 tones is turned on. Each tone sends 3 bits as a result. The data is encoded with a Golay code. This is about twice as fast as is optimal for most HF channels given this kind of transmission (IMO) but the Golay really does work.
Bob N4HY Mark Miller wrote: >> This is needed, >> absolutely mandatory, to mitigate the fading multipath HF channel. >> > > > Bob, > > Thanks. I have not had a opportunity to send images with 188-110, but > after reading the specification, I thought adaptive equalization would be > necessary. I look forward to sending images. I have been hanging out of > the 20 meter channels hopping that conditions would be right to do some > testing. So far I have only used the messaging in 188-141 which I don't > believe has the training sequence necessary for adaptive equalization. > > 73, > > Mark N5RFX > > > > > Need a Digital mode QSO? Connect to Telnet://cluster.dynalias.org > > Other areas of interest: > > The MixW Reflector : http://groups.yahoo.com/group/themixwgroup/ > DigiPol: http://groups.yahoo.com/group/Digipol (band plan policy discussion) > > > Yahoo! Groups Links > > > > > > > > -- AMSAT VP Engineering. Member: ARRL, AMSAT-DL, TAPR, Packrats, NJQRP/AMQRP, QRP ARCI, QCWA, FRC. ARRL SDR Wrk Grp Chairman "You see, wire telegraph is a kind of a very, very long cat. You pull his tail in New York and his head is meowing in Los Angeles. Do you understand this? And radio operates exactly the same way: you send signals here, they receive them there. The only difference is that there is no cat." - Einstein Need a Digital mode QSO? Connect to Telnet://cluster.dynalias.org Other areas of interest: The MixW Reflector : http://groups.yahoo.com/group/themixwgroup/ DigiPol: http://groups.yahoo.com/group/Digipol (band plan policy discussion) Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/digitalradio/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
