[R-390] PTO endpoints

[David Wise]

I can do the endpoints in situ, using a *very*
short screwdriver which is actually the broken-off
end of an old metal-tipped diddle stick.  It was
about two inches long and 1/4 inch diameter.
The length has to be just right.  Too long and
you can't get it into position, too short and
you can't grip it to turn.  There's not much
leverage, so it's important that it has good
grip and you have squeaky-clean, average- or
small-sized fingers.

1. Tip the receiver onto its back.

2. Maneuver the screwdriver through the holes.

3. Loosen the cover screw.  Use pliers on
the screwdriver for leverage if necessary.
You can also come in at an angle with a small,
long, skinny screwdriver, but again, torque
is limited.

4. Finagle it out of the way using another
small, skinny screwdriver.

5. Adjust.

6. Fiddle the cover screw back into position.

7. Tighten.  Yer done.

73,
Dave Wise

> From: Jim Brannigan [mailto:jbrannig@optonline.net]
>=20
> It was a lot easier to pull the VFO, and attach a frequency counter.
> I put pencil marks on the oldham coupler and PTO body as=20
> reference points.
> wrote down the low frequency, counted ten turns, wrote down the high
> frequency, count down ten turns, set to marks, adjust coil. Repeat and
> adjust as necessary.
> When I was done, I set the counter dial to the calculated PTO=20
> frequency and
> reassembled.
> Final calibration can be done with the "ZERO SET"