Yaesu FT-991A Technical Supplement

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

Contents

AlignmentALIGNMENT-9 FT-991 Technical SupplementIF Gain Adjustment Set the following controls as indicated:[IPO] : AMP1[ATT] : OFF[AGC] : AUTO[RF GAIN] : Fully clockwise Connect the AF millivoltmeter and 4 Ohmdummy load to the EXT SP jack. Connect the RF Signal Generator to the “HF/50MHz” ANT jack, then set the output level to+36 dBμ at 1.900 MHz. Set the VFO-A frequency to 1.900 MHz in theUSB mode. Press and hold in the [A=B], [A/B], and [FAST]keys, while turning the radio on, to enter thealignment mode. Adjust the [AF GAIN] knob so that the AF mil-livoltmeter reading is “0 dB”. Set the RF Signal Generator output level to +10dBμ. Adjust the [CLAR/VFO-B] knob so that the AFmillivoltmeter reading is “-1.5 ± 0.5 dB”. Select the appropriate “Alignment menu item”using the [MULTI] Dial knob per the chart be-low, then set the RF Signal Generator output toeach frequency & level, and adjust the [CLAR/VFO-B] knob for the corresponding AF milli-voltmeter reading at each frequency. Press and hold in the [MENU(SETUP)] buttonfor one second to save the new settings and exitthe alignment mode.Alignmentmenu itemVFO-AFrequencyRF SignalGenerator Adjust AF millivoltmeter04-01 IGC 1.8 1.900 MHz 1.900 MHz, +36 dBμ [AF GAIN] knob 0 dB1.900 MHz, +10 dBμ [CLAR/VFO-B] knob -1.5 dB (±0.5 dB)04-02 IGC HFL 7.100 MHz 7.100 MHz, +36 dBμ [AF GAIN] knob 0 dB7.100 MHz, +10 dBμ [CLAR/VFO-B] knob -1.5 dB (±0.5 dB)04-03 IGC HFM 14.200 MHz 14.200 MHz, +36 dBμ [AF GAIN] knob 0 dB14.200 MHz, +10 dBμ [CLAR/VFO-B] knob -1.5 dB (±0.5 dB)04-04 IGC HFH 21.230 MHz 21.230 MHz, +36 dBμ [AF GAIN] knob 0 dB21.230 MHz, +10 dBμ [CLAR/VFO-B] knob -1.5 dB (±0.5 dB)04-05 IGC 50 51.900 MHz 51.900 MHz, +36 dBμ [AF GAIN] knob 0 dB51.900 MHz, +7 dBμ [CLAR/VFO-B] knob -1.5 dB (±0.5 dB)04-06 IGC 144 145.900 MHz 145.900 MHz, +30 dBμ [AF GAIN] knob 0 dB145.900 MHz, -3 dBμ [CLAR/VFO-B] knob -1.5 dB (±0.5 dB)04-07 IGC 430 439.900 MHz 439.900 MHz, +30 dBμ [AF GAIN] knob 0 dB439.900 MHz, -3dBμ [CLAR/VFO-B] knob -1.5 dB (±0.5 dB)