>The individual wanting to do this, is primarily interested in running two >bands (e.g., 2 meters/440) with full duplex.
Well if it was absolutely necessary to use telephone fax machines, then at the originating end you would need a device that supplies -48 volts to the fax machine telephone interface, and can sense when the originating fax machine goes off hook. This device would then key the transmitter. At the answering end, a device would have to sense when the receiver breaks squelch and would have to provide the 20 Hz ring signal to the answering fax machine, sense off-hook, and key the transmitter.. When the fax is completed the originating end would go on-hook and the originating device would have to de-key the transmitter. At the answering end, the device would sense squelch, go on-hook and de-key the transmitter. A start would be the device like http://www.jkaudio.com/tap-1.htm with the addition of the transmitter and receiver control circuitry. A good article on telephone interfacing is at http://www.tkk.fi/Misc/Electronics/circuits/teleinterface.html#audioint This sounds like an interesting project, however there are programs set up to send high quality digital images, ie WinDRM, HamPal, and DigTRX. 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 <*> 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/
