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Baycom modem

The PTT works but no signal (from the output or the chip) I have gone through all the papers and discovered theres been a problem before: mainly the "World Chip" (i think 7910?)  has been replaced once for unknown reasons. ???  i think it is a BP-1 (or other very early model (there are no labels but it sounds like a BP-1 from descriptions))
If it is the chip where can you get replacements?
Any help (and all the suggestions) has made me know their are still amatures who are interested :-)  
va3lgo@rocketmail.com or sircarl@echelon.ca