Yaesu FT-950 Technical Supplement

Also see for FT-950: Brochure & specs Reference Manual Update Update

Contents

ALIGNMENT-6AlignmentFT-950 Technical SupplementMCF Adjustment (2) Press and hold in the [1.8(1)], [3.5(2)], and [7(3)]keys, while turning the radio on, to enter thealignment mode. Rotate the Main Tuning Dial knob to select thealignment parameter “G-03 FnG”. Rotate the [CLAR(VFO-B)] knob so that the Mult-Display Window shows “80”. Press and hold in the [MENU] button for one sec-ond to save the new setting and exit the align-ment mode. Set the VFO-A frequency to 50.000 MHz in theFM mode. Set the following controls as indicated:[ANT 1-2] button: ANT 1[IPO] button: AMP2[ATT] button: OFF[μ-TUNE] button: THRU[R.FLT] button: 15 kHz[AGC] button: AUTO[RF GAIN] knob: Fully clockwise Connect the SINAD meter and 4 Ohm dummyload to the EXT SP jack. Connect the RF Signal Generator to the “ANT 1”jack, then set the output level to –10 ~ 0 dBμ atthe 50.000 MHz with ±3.5 kHz deviation FMmodulation of a 1 kHz audio signal. Adjust T1024 and T1031 on the MAIN Unit insuccession several times for maximum deflectionon the SINAD meter. Adjust T1022 on the MAIN Unit in successionseveral times for maximum deflection on theSINAD meter.Note: Do not adjust T1022 more than 45 degreesrotation.Noise Blanker Circuit Adjustment Set the VFO-A frequency to 14.200 MHz in theCW mode. Set the following controls as indicated:[ANT 1-2] button: ANT 1[IPO] button: AMP1[ATT] button: OFF[μ-TUNE] button: THRU[R.FLT] button: AUTO[AGC] button: AUTO[NB] button: ON (for short-duration pulse noise)[RF GAIN] knob: Fully clockwise Connect the Digital DC voltmeter (high-Z) toTP1059 on the MAIN Unit. Connect the RF Signal Generator to the “ANT 1”jack, then set the output level to 30 dBμ at 14.200MHz. Adjust T1029 and T1023 on the MAIN Unit forminimum deflection on the DC voltmeter. Turn the NB to “OFF” by pressing the [NB] but-ton.Scope Circuit Adjustment Set the VFO-A frequency to 14.200 MHz in theCW mode. Set the following controls as indicated:[ANT 1-2] button: ANT 1[IPO] button: AMP1[ATT] button: OFF[μ-TUNE] button: THRU[R.FLT] button: AUTO[AGC] button: AUTO[RF GAIN] knob: Fully clockwise Disconnect the coaxial cable from J1028 on theMAIN Unit, then connect the RF millivoltmeterto J1028. Connect the RF Signal Generator to the “ANT 1”jack, then set the output level to 80 dBμ at 14.200MHz. Adjust T1019 on the MAIN Unit for maximumdeflection on the RF millivoltmeter. Disconnect the RF millivoltmeter from J1028, thenre-connect the coaxial cable to J1028.