What was found
NR1 HF WEAK AND SCRATCHY IN REC-XMIT UNABLE TO USE. NEEDS MORE TIME. REPLACED HF-L ANTENNA COUPLER, NO HELP. TDR CHECK OF ANTENNA CABLES FROM E & E TO ANTENNA CHECKS GOOD. CHECKED CONNECTIONS IN COUPLER AND ANTENNA AREA. REPLACED LT AND RT HF COAX CABLE CONNECTORS AT COUPLER IAW GNMM. UNABLE TO OPS CHECK DUE TO STRUCTURE IN FRONT OF ACFT. REQUEST CREW OPS CHECK ON OTBD FLIGHT. ACFT TAXIED AND GOOD VOICE COMMUNICATIONS ON BOTH HF RADIOS. 59-220 CONNECTORS ON EACH-COUPLER FOUND IMPROPERLY INSTALLED. ALL OPS NORMAL AFTER REPLACEMENT.