[R-390] [KA9EGW] Mechanical Alignment.

[Flowertime01 at wmconnect.com]

Brian,

The usual sequence is to proceed in the following order on the mechanical 
alignment.

Run the KC dial from end to end and remember the dial over run on each end.
Add those two number together and divide by two. (about 35).

Run the KC Knob off the end point.

Engage the zero adjust. 

Run the KC knob to both ends without moving the zero clutch.

Feel the middle point of the zero range. (its a learned thing as you cannot 
eyeball it). Pencil marks between knob and face plate do help.

Set the KC knob to the center of the zero adjust. 

Release the zero adjust with the KC knob center.

Roll the KC knob to the hard stop end point (top or bottom your choice).

Open the vedder root counter dial cover and set the over run to the number 
you need. (about 35 over or under).

Tighten that all back up and run the KC knob end to end the over run should 
be equal on both ends.

If not, think how many numbers you are off and which way you want to go.

Pick a number some where off the end points.

Mark the KC knob against the front panel plate with your pencil.

Dial the number off set you need in the opposite direction.

Engage the zero adjust, move the KC knob back to the mark, release the zero 
adjust shaft.

Go to an end point. Adjust the veeder root dial back to the end point over 
run number.

Tighten every thing up again.

Run to both ends and see if you have equal over run on each end. 

Get to with in 5 and quit this. You have other things to do in life.

Put the dial cover back on.

Do not play with the zero adjust clutch any more in this procedure.

Go to 7+000 and align the cams (.5 - 1) should be the only one that changes.

But do what ever RF deck mechanical alignment is needed.

You may need to position the clamp bolt on the oldham coupler so you can 
loosen and tighten it when the dial counter is at 000.

You can loosen position and retighten the oldham coupler clamp without 
changing the relation of the VFO shaft to the KC knob shaft.

Dial up 000 on either end. 

Lock the KC shaft with the dial lock.

Loosen the oldham coupler clamp.

If you have a counter loosen the VFO oldham coupler and set the VFO to 
3.455 or 2.455 which ever end you selected. Tighten up the coupler.


Or else
Go to WWV at 10.000 or 9.+000. or where ever you find it in propagation 
range.
Rock WWV into max signal.
Change the band width down to .1 and peak WWV

loosen the oldham coupler clamp. Try the KC shaft side if you can.

Hold the VFO shaft with a pair of pliers.

Dial the KC knob back to zero.

Retighten the clamp.

If you think your BFO is close you can use the .1 IF band width, the BFO 
zero beat and position the VFO to within about 50 hertz or better. You can 
watch the meter twitch down to zero. But how close is the BFO to start with?

You can rock the BFO to under a 100 hertz with a signal generator and the 
.1 IF band width through the 455 crystal in Z501.

This should get:
Zero adjust centered
Over run even on both ends.
Mechanical cams aligned.
VFO set.

And you are good until a clamp slips.

Roger AI4NI