Yaesu FT-991A Technical Supplement

Also see for FT-991A: Information for Customers Operating Manual Information for Customers Operating Setup Instruction manual

Contents

AlignmentALIGNMENT-3 FT-991 Technical SupplementVCO Adjustment Connect the Digital DC voltmeter (high-Z) toTP2002 on the PLL Unit. Disconnect the coaxial cable from J2001 on thePLL Unit, then connect the RF millivoltmeter topin 13 of J2001. Press and hold in the [A=B], [A/B], and [FAST]keys, while turning the radio on, to enter thealignment mode. Referring to the table below, select the ap-propriate “Alignment menu item” using the[MULTI] Dial knob per the chart right, andadjust the listed components for the requiredvoltage, or confirm that the correct voltage ispresent on each alignment menu item.AlignmentMenu ItemAdjust /Confirm DC voltmeter RF millivoltmeter01-05 VCO1-HIGH(TXI)AdjustL2004 5.1 V ±0.1 V At least 3 dBm01-06 VCO1-LOW Confirm At least 0.3 V At least 3 dBm01-07 VCO2-HIGH AdjustL2005 5.1 V ±0.1 V At least 3 dBm01-08 VCO2-LOW Confirm At least 0.6 V At least 3 dBm01-09 VCO3-HIGH AdjustL2006 4.1 V ±0.1 V At least 3 dBm01-10 VCO3-LOW Confirm At least 0.4 V At least 3 dBm01-11 VCO4-HIGH AdjustTC2001 5.0 V ±0.1 V At least 3 dBm01-12 VCO4-LOW Confirm At least 0.5 V At least 3 dBm01-13 VCO5-HIGH AdjustTC2002 5.0 V ±0.1 V At least 3 dBm01-14 VCO5-LOW Confirm At least 0.8 V At least 3 dBm Disconnect the RF millivoltmeter from J2001,then re-connect the coaxial cable to J2001. Press and hold in the [MENU(SETUP)] buttonfor one second to save the new setting and exitthe alignment mode.TP2002J2001TC2001 TC2002L2006L2005L2004