[R-390] PTO....Coming and Going

[Roy Morgan]

At 12:44 PM 5/21/02 -0700, KC8OPP Roger S. wrote:
>When I checked the 100KHz points from 000 to +000 the
>values were all over the place, as much as 1.998KHz
>high but when I checked it starting at +000 and going
>to 000 the freq was never more that 243 Hz out
...
>Anyone have any words of wisdom?

Roger,

Disassemble your PTO and lubricate it.

>Any cautions about
>adjusting the corrector stack?

Before you adjust the corrector stack, you should find or make a jig to do 
the job.  I know of only one person on the planet who has one.  That is 
Howard Mills.  You may not have to adjust the corrector stack if you get 
good linearity in one direction. You need lubrication first, I think.

>   What lubricant (if
>any) should I use on the lead screw and corrector
>stack?

See any of the articles that have been written on the topic..  The little 
roller is important I suggest you clean that, then add 
lubrication.  Molybdenum Disuphide grease may be best.

>   And finally, how do you get all of that
>fiberglass insulation back in the can?!!!

Wrap the inner can and the insulation with a piece of plastic, such as an 
overhead projector slide, or clear notebook cover from the office supply 
store.. squeeze the insulation down flat.. use rubber bands to hold it 
tight. then slip the cans together and then withdraw the plastic.  Slits 
lengthwise in the plastic may help get it out around the tubes and framework.

Check your OVENS switch OFF.

- Roy Morgan, K1LKY since 1959 - Keep 'em Glowing!
7130 Panorama Drive, Derwood MD 20855
Home: 301-330-8828 Work: Voice: 301-975-3254,  Fax: 301-948-6213
roy.morgan@nist.gov --