This was answered off-line but for the group:

"Floyd Sense" wrote
"Jack Painter" wrote in message
snip
The coax shields grounded at the tower (min. at the bottom, best top and
bottom), and again at the basement entrance single point ground. Shields
must be grounded before connection to an arrestor.


Jack - regarding your comment on grounding the shields BEFORE connection
to
an arrestor: My arrestors are mounted on the common ground panel and the
coax is grounded via the coax connector to those arrestors. What is the
reason for a separate ground prior to that one. Maybe I misunderstood
something, but it seems redundant to have a separate ground a few inches
from that one.

Coax shield grounding must be accomplished at the tower top, tower base (on
ground level, not even 6" above!) and before the arrestor to comply with
protector manufacturer requirements and to be in keeping with best
engineering practices that are used nationwide in communication tower
designs. The grounding just before the arrestor is for two purposes: 1.
preventing unnecessary energy (whether capacitively or inductively coupled)
from challenging the gas tube, MOV, coil (or all three) mechanisms of a
protector, and 2: to help limit the differing potential available to
reverse-path voltage from a nearby strike in ground potential rise
conditions. A nearby strike can saturate the ground system, and a station
ground can reference hundreds of thousands of volts 'up' from the ground,
and 'out' via arrestors, phone, power cables to lower potential felt at some
distant point. Grounding cable shield at the station single point ground
thus helps maintain equipotential for both directions. Even if the station
coax arrestors are mounted on the master ground the additional grounding is
still helpful for voltage-division during saturated ground conditions. But
in all cases that ground bus mount must never be the only place the coax
shelding is grounded!


In response to another's comments regarding protection of the SteppIR,
rotor, and other control lines: I use MOVs and .01 bypass caps on all
those
lines in a box at the base of the tower and have another set of the same
at
the entry panel box. Those components are mounted via European-style
screw
terminal strips (12 positions per strip) obtained from Jameco via the Web.
Much cheaper than the same from Radio Shack or other sources. MOVs came
from Mouser. A lightning strike last year entered my shack via relay
control lines which were unprotected at that time. Hopefully, the new
arrangement will help.

73, Floyd - K8AC

Several amateurs have reported successful use of private design MOV on
control lines. While this could exceed commercially available equipment
specs in some cases, for those less familiar with such designs, they are
readily available in package-form to protect control lines.

Jack