[R-390] Proud owner

[Jim Brannigan]

More thoughts.

I keep several binders for the radios.
One has the original manual.
Another for MODS and good ideas.
The third is for shop notes.  Repairs, changes, voltage readings and charts.
MS Excel is great for voltage/resistance charts.  I enter the values from
the manual in a tabular form.  The actual readings are entered and a formula
in a cell can be set-up to look at variances (10%, 20%, high, low, etc.)
If you set the out of parameter cells to display in red it is really easy to
use.

Excel charting functions are used  for PTO linearity, drift, SWR
curves.......

A printed, dated copy is placed in the shop book for future reference.