[R-390] V VFO Band Spread Adjustment

[Flowertime01 at wmconnect.com]

V VFO Band Spread Adjustment
___ 01 If needed continue from the preceding section
___ 02 Set the FUNCTION switch to CAL
___ 03 Set the MHz to 9 MHz
___ 04 Set the Zero Adjust to center
___ 05 Set the KHz knob to 000
___ 06 Remove the Oldham coupler spring
___ 07 Remove the VFO from the receive
___ 08 Remove the end point adjustment cap screw
___ 09 Attach the output cable and harness cable
___ 10 Adjust the VFO shaft for a zero beat
___ 11 Mark the coupler and VFO face (9,000 3,455)
___ 12 Set the KHz knob for 9,+000 (9,+000 2,455)
___ 13 Dial 10 turns on the VFO shaft and align the marks
___ 14 If the span is not exact make a small adjustment to the end point
___ 15 Do not over adjust the end point to a complete zero beat
___ 16 Observe the pitch is closer to zero beat
___ 17 Back off the 10 turns on the VFO shaft (only work one way)
___ 18 Set the KHz knob to 000
___ 19 Adjust the VFO shaft for a zero beat
___ 20 Mark the coupler and VFO face (9,000 3,455)
___ 21 Set the KHz knob for 9,+000 (9,+000 2,455)
___ 22 Dial 10 turns on the VFO shaft and align the marks
___ 23 If the span is not exact make a small adjustment to the end point
___ 24 Do not over adjust the end point to a complete zero beat
___ 25 Observe the pitch is closer to zero beat
___ 26 Repeat steps 17, 18, 19, 20, 21,22, 23, 24 and 25 until span is exact
___ 27 Make a small adjustment to the end point (CW longer CCW shorter
___ 28 Do not over adjust the end point to a complete zero beat
___ 29 replace the end point cover screw
___ 30 Return the VFO shaft to its original location
___ 31 Reinstall the VFO into the receiver
___ 32 Carefully verify the 10 turn operation of the VFO
___ 33 Adjust the mechanical position of module for best shaft alignment
___ 34 Adjust the Oldham coupler for a free spacing of shafts
___ 35 Replace the Oldham coupler spring
___ 36 Attach an antenna to the balanced input
___ 37 Tune WWV at 20MHz, 15Mhz, 10MHz or 5Mhz
___ 38 Set the BFO to OFF
___ 39 Set the bandwidth to .1Khz
___ 40 Set the KHz to 000
___ 41 Loosen the front KHz shaft clamp on the Oldham coupler
___ 42 Rock the VFO to peak WWV through the crystal filter
___ 43 Tighten the front KHz shaft clamp on the Oldham coupler
___ 44 Set the BFO to ON
___ 45 Set the BFO Pitch to 0
___ 46 Loosen the extension shaft clamp on the BFO
___ 47 Adjust the BFO shaft to zero the BFO Pitch
___ 48 Tighten the extension shaft clamp on the BFO
___ 49 Set the FUNCTION Switch to CAL
___ 50 Adjust the CAL Adjust Trim to zero the Calibration Oscillator
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