Ameritron SRS-100 Remote Sensor Add-on Kit Installation Manual
Ameritron Remote Sensor Add-on Kit for High Sierra Antennas
Installation Manual
INTRODUCTION
Installation of this simple kit on your screwdriver antenna will allow you to enjoy the
convenience of quickly and accurately returning to antenna settings, when used with the
Ameritron SDC-100 Screwdriver Antenna Digital Controller with Counter.
The High Sierra screwdriver antenna does not have a magnetic switch installed from the factory.
In order for the Digital Controller to function the screw driver antenna must have a magnet and a
magnetic switch installed. Removing your antenna from its mount is necessary to install this kit.
Follow the instructions in this manual to disassemble the antenna. Then install the magnet
bracket and the magnetic switch and reassemble the antenna. Install the dropping resistor and
connect the sensor wires from the antenna to the digital controller.
PARTS INVENTORY
1 – Magnet and bracket assembly
1 – Surface mount magnetic contact (switch)
2 – Heavy duty cable straps
1 – stainless steel split washer
1 – ¼-20 stainless steel nut
1 – 5-ohm wire wound resistor
2 – lengths of switch wire, one brown, one white
PREPARATION – ANTENNA DISASSEMBLY
(1) Remove whip and disconnect motor
control wires at antenna base.
(2) Remove antenna from its mount and
place on a flat work surface.
(3) Unscrew quick disconnect or other whip
mount from top of antenna and set aside,
along with lock washer and flat washer.
(4) Slide off the clear plastic weather shield,
along with the top plastic cap.
(5) Remove the 8 screws and washers that
secure the large brass insert into the
main shaft at the base of the antenna.
(6) Slide the brass insert out and set aside.
Figure 1: Before modification
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Ameritron SRS-100 Remote Sensor Add-on Kit Installation Manual
(7) Locate the two screws in the main shaft, which are about 9 inches from the bottom of the
shaft. Remove the screws and washers and set aside.
(8) Use a yardstick or dowel rod to gently push the motor and coil assembly, from the top of
the antenna, completely out of the bottom of the main shaft.
(9) Remove the cotter pin that secures the motor bushing to the threaded rod and pull the
bushing off the shaft.
INSTALLATION
(10) The threaded shaft is secured to the
base of the coil form by a rubber
bushing, flat washer, and two nuts.
Remove only the outer nut. (Fig. 1)
(11) Place the magnet bracket onto the
threaded shaft against the existing nut.
(12) Place a split washer on the threaded
shaft.
(13) Screw a nut on the shaft and tighten it
very tight, until the split washer is
compressed. Screw on the second
supplied nut and tighten it very tight.
(Fig 2). Install the first nut and
tighten securely before installing the
second nut.
Figure 2: After modification
(14) Now is a good time to perform the antenna manufacturer’s scheduled maintenance on
your antenna, such as washing and periodic cleaning. See your High Sierra manual.
(15) Temporarily screw the quick-disconnect (or other whip fixture) back into the top of the
coil form.
(16) Place the coil and motor assembly side-by-side with the motor’s mounting holes aligned
with the motor mounting holes in the main shaft. Observe how far the coil form and
quick disconnect extend past the top end of the main shaft.
(17) Note the position of the magnet relative to the main shaft and make a corresponding mark
on the outside of the main shaft. Make a permanent mark for future reference. (Fig. 3)
(18) Slide the motor/coil assembly into the bottom of the main shaft the appropriate distance.
Use the temporarily-installed whip fixture to manually rotate the motor/coil assembly
until the motor mounting holes line up. Or, you can grasp the whip fixture with pliers
and rotate the main shaft to align the motor mounting holes. If you removed the plastic
bumper and the lower weather shield cap for cleaning, reinstall them on the main shaft.
(19) Install the 2 motor mounting screws.
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