[TowerTalk] Ham II rotor mounting holes

Sun Jul 12 01:38:50 EDT 2020

The hole pattern for four of the holes is the same for all CDE/HyGain rotators . The T2X has two additional bolt holes, but not every plate drills them.   The T2X uses 5/16” bolts, everything else uses ¼” bolts.  You should put some flat washers on the ¼” bolts when bolting to the plate with the 5/16” holes.

Ken K6MR

From: James Wolf<mailto:jbwolf at comcast.net>
Sent: Saturday, July 11, 2020 19:07
To: towertalk at contesting.com<mailto:towertalk at contesting.com>
Subject: [TowerTalk] Ham II rotor mounting holes

I have a Tailtwister that needs to come down for limit switch and indicator
problems.  I have a Ham II rotor that I am going to temporary put in its
place.

Will the Ham II rotor's four mounting bolts fit in the same four holes that
are drilled for the Tailtwister?

The Ham II's holes are 3 inches apart, but the template I have for the
Tailtwister measures about 2.9 inches.  Is the template distorted?

Twisting the Ham II and re-drilling the holes is a problem because the
opening for the control wires is cut in the rotor plate.

So, is my solution to twist the rotor, drill new holes and put standoff's
between the Ham II rotor and the mounting plate to accommodate the control
cable?  I'm not happy doing it this way.

This rotor plate is custom built that fits in the # 5 section of the Rohn
HBX tower series.