The PTO Endpoint Adjustment
For those of you wanting to cut to the chase here is the procedure I used to do the endpoint adjustment: 1. Place the PTO unit close enough to the radio that you can plug in the power connector. Connect the output to a frequency counter. 2. Remove the VFO tube. Unscrew the endpoint access cover screw and remove it from the unit. 3. Replace the VFO tube, power up the radio and let the PTO warm up for an hour. 4. Rotate the PTO shaft until the frequency counter displays 2.455 mc and mark this position of the coupler spring post against the front mounting plate as an index point. 5. Rotate the shaft exactly 10 turns counter-clockwise. Line up the spring post exactly with the pencil mark. 6. If the frequency counter reads 3.455 mc the PTO is aligned. If not turn the endpoint adjustment screw until it does. 7. Turn the shaft clockwise 10 turns back down to where the frequency counter reads 2.455 mc. This point should now be shifted a little from the original index point. Erase the original index point and mark a new one in the new position. 8. Repeat No's. 5, 6 and 7 until you get as close as you can to 3.455 mc. You should now have exactly a 1 megacycle spread over 10 turns of the PTO. 9. Rotate the PTO back down to the 2.455 mc position. 10. If the PTO oldham coupler is not positioned so that it's ridge is exactly horizontal, loosen the coupler clamp and position it so. Make sure that the PTO is still running at 2.455 mc when you have finished moving the coupler. Then tighten the PTO coupler clamp. 11. Power down the radio and remove the VFO tube, replace the adjustment access cover screw in the PTO unit, and then replace the tube. 12. With the Kilocycle Dial set to +000, loosen the Kilocycle Dial oldham coupler clamp and position the coupler so that the ridge is in the horizontal position. Tighten the clamp. 13. Angle the PTO unit into position in the radio while holding the oldham disk against the PTO oldham coupler. The unit should slide into position with the front of the disk meshing with the Kilocycle Dial coupler. 14. Fasten the PTO unit to the radio with the 3 captive mounting screws.

The PTO Endpoint Adjustment

For those of you wanting to cut to the chase here is the procedure I used to do the endpoint adjustment:

1. Place the PTO unit close enough to the radio that you can plug in the power connector. Connect the output to a frequency counter.

2. Remove the VFO tube. Unscrew the endpoint access cover screw and remove it from the unit.

3. Replace the VFO tube, power up the radio and let the PTO warm up for an hour.

4. Rotate the PTO shaft until the frequency counter displays 2.455 mc and mark this position of the coupler spring post against the front mounting plate as an index point.

5. Rotate the shaft exactly 10 turns counter-clockwise. Line up the spring post exactly with the pencil mark.

6. If the frequency counter reads 3.455 mc the PTO is aligned. If not turn the endpoint adjustment screw until it does.

7. Turn the shaft clockwise 10 turns back down to where the frequency counter reads 2.455 mc. This point should now be shifted a little from the original index point. Erase the original index point and mark a new one in the new position.

8. Repeat No's. 5, 6 and 7 until you get as close as you can to 3.455 mc. You should now have exactly a 1 megacycle spread over 10 turns of the PTO.

9. Rotate the PTO back down to the 2.455 mc position.

10. If the PTO oldham coupler is not positioned so that it's ridge is exactly horizontal, loosen the coupler clamp and position it so. Make sure that the PTO is still running at 2.455 mc when you have finished moving the coupler. Then tighten the PTO coupler clamp.

11. Power down the radio and remove the VFO tube, replace the adjustment access cover screw in the PTO unit, and then replace the tube.

12. With the Kilocycle Dial set to +000, loosen the Kilocycle Dial oldham coupler clamp and position the coupler so that the ridge is in the horizontal position. Tighten the clamp.

13. Angle the PTO unit into position in the radio while holding the oldham disk against the PTO oldham coupler. The unit should slide into position with the front of the disk meshing with the Kilocycle Dial coupler.

14. Fasten the PTO unit to the radio with the 3 captive mounting screws.