066

5-8-3. Digital display calibration

1.Removing the top cover, filter unit cover and the bottom covers from radio, and place the radio on its side with the antenna tuner area down.

2.Remove the two screws that secure the rear of the IF unit to the chassis and raise the IF unit up towards the front panel. Connect the two pin end of the supplied calibration cable to connector num- ber 8 on the PLL unit, as shown in ,the figure.

3.Connect the single pin end of the cable to the CAL terminal pin that is located along the back edge of the RF unit, near the large shielded area.

4.Connect your antenna and tune to WWV.

5.Using a small flat bladed screwdriver adjust trim- mer capacitor TC 1, near connector 8 of the PLL unit, for zero beat. Zero beat is the point where the two audio tones are oscillating at the slowest rate.

5-8-4. Optional 10Hz display resolution

If you would like 10Hz resolution instead of the sup- plied 100 Hz display resolution, cut 066 as shown on

the Control unit.

1.Remove the top and bottom covers from the radio.

2.Remove the countersink screws (2 on each side) that secure the front panel to the chassis and gently pull the front panel forwards.

3.Remove the 5 small round head screws that secure the shield plate (2 on the top and 3 on the bottom) to the front panel, and remove the shield plate.

4.Cut the lead of diode 066 located below the dip switch on the control unit.

5.Reverse steps 1.-3. to reassemble the radio.

Notes:

1.When reassembling the radio make sure that you do not cut or pinch any wires between the chassis

and front panel!

2.Do not alter the settings of the dip switch. They are factory adjusted, and damage or misoperation may result.

unit

5-8-5. CW zero beat frequency selection

You may select between 800 Hz and 400 Hz zero beat adjustments in the CW mode by cutting diode 073 on the control unit.

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1. Remove the top and bottom covers from the radio. 2. Remove the countersink screws (2 on each side) that secure the front panel to the chassis and gently

pull the front panel forwards.

3. Remove the 5 small round head screws that secure the shield plate (2 on the top and 3 on the bottom) to the front panel, and remove the shield plate.

4. Cut the lead of diode 073 located below the dip

switch on the control unit.

5. Reverse steps 1. -3. to reassemble the radio.

Notes:

1.When reassembling the radio make sure that you do not cut or pinch any wires between the chassis

and front panel!

2.Do not alter the settings of the dip switch. They are factory adjusted, and damage or misoperation may result.

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