Even a "QRP" rig for digital use only will have these same problems that have to be examined and subsystems properly designed and built. A 'simple' audio amp in a tranceiver may work fine for SSB voice, but may have amplitude and phase variations over the designed bandwidth that can adversely effect a multi-tone digital signal. Certainly, mixers, diplexers, filters, and rf/if amps used over broad ranges of frequencies like 1.8 mHz to 30 mHz can have substantial effects also. I think what you're really pointing out is that more careful design and more costly circuits than what is available in the average ham radio may be needed in order to optimize the handling of digital signals. Jim WA0LYK --- In [email protected], "Charles Crizer" <[EMAIL PROTECTED]> wrote: > > Spot on. > > What about desgining and building a "QRP" radio for digital use. > > Its seems to me that some of the problems you mention are because the radio > is made for many modes. What if the radio was just build for RTTY, PACKET, > PSK31, PACTOR, etc? > > Instead of a 300-3500Hz audio bandwidth, it could be much tighter and > desigend for the exact mode being used. After all, isn't that the way CW QRP > rigs are desigend? They only have to work with a very narrow bandwidth. > > Charlie Crizer, KF4MNE > Fairfax County (Alexandria) Virginia, US > QTH: 38-47.96N / 77-05.17W - FM18kt > [EMAIL PROTECTED] > [EMAIL PROTECTED] - Winlink2000/Airmail >
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/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/digitalradio/join (Yahoo! ID required) <*> To change settings via email: mailto:[EMAIL PROTECTED] mailto:[EMAIL PROTECTED] <*> 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/
