BLOCKED FREQ CAUSED LESS THAN STANDARD SEPARATION AND NEAR MIDAIR COLLISION.

Narrative

WE WERE CLBING TO FL330--WHILE CLBING THRU 27000' WHEN THE F/O MADE AN EXCLAMATION(!) AND GRABBED THE YOKE. I SAW LTT Y IN HIS FORWARD WINDSHIELD. LTT Y PASSED BELOW OUR ACFT AND WAS IN A DSNDING L TURN AS I SAW IT; LTT Y PASSED BENEATH US AND I AGAIN SAW IT IN MY L WINDOWS. IMMEDIATELY AFTER THE 'NEAR-MISS' WE CALLED NY CENTER (132.17) AND ASKED 'WHAT WAS THAT' (OR SOMETHING TO THAT EFFECT). NY CENTER IMMEDIATELY REPLIED; 'WDB X WE'VE BEEN TRYING TO CALL YOU; THERE'S BEEN A 'STUCK' MIKE ON THE FREQ.' WE DID NOT NOTICE ANY STATIC OR 'CARRIER-WAVE ON THE FREQ; AND NY CENTER WAS `CLR' AS WE TALKED. THEY (ZNY) ALSO WERE APOLOGETIC AND ANSWERED IMMEDIATELY ON INITIAL CALL. CALLBACK CONVERSATION WITH RPTR REVEALED FOLLOWING INFO. RPTR (WDB CAPT) ASKED TO BE MET AT DEST FOR A FOLLOW-UP NMAC RPT. A FSDO INSPECTOR MET THE FLT AND TOOK THE NECESSARY INFO FROM THE FLT CREW. WDB FLT CREW WAS SKEPTICAL ABOUT THE CENTER'S RADIO RPT OF A 'STUCK MIKE.' THE FSDO INSPECTOR AGREED TO DO A FOLLOW-UP INVESTIGATION TO ASCERTAIN EXACTLY WHAT HAPPENED. THE SUBSEQUENT INVESTIGATION REVEALED THAT THE CTLR DID TRY NUMEROUS TIMES TO CONTACT THE RPTR'S ACFT TO AFFECT SEP BUT THERE WAS A CARRIER WAVE ON THE FREQ AND CONTACT WAS NOT ESTABLISHED UNTIL AFTER THE NEAR COLLISION. RPTR STATED THAT HE WAS EXTREMELY GRATEFUL THAT THE PLT OF THE CPR SMT WAS ALERT ENOUGH TO TAKE EVASIVE ACTION THAT PREVENTED A MIDAIR COLLISION.