How Do I Take It Apart; How Do I Put It Together; Atas100 Manual Tuning - Yaesu FT-100 Undocumented

in. This base assembly is secured with pins and would be hard to dissemble without
damaging.
Inside this is an RF choke coil (I'm not sure if it is air wound or on a torrid) that makes
this whole antenna DC grounded. This protects the radio from damage from whip contact
with power sources, static build up, etc. The coil also helps with matching the antenna
and contributes to the high Q of the design.
Connected to this is a capacitor that leads to the center pin on the SO-239 receptacle in
the base. This capacitor is also part of the "broad band" matching network.

HOW DO I TAKE IT APART?

1. Extend the antenna fully (40m).
2. Remove from vehicle and take it to a clean work surface.
3. Remove the whip for ease of handling.
4. Slide up the 2 rubber covers exposing the screws.
5. Remove the 3 lower screws above the base.
6. CAREFULLY remove the base by gently pulling down while using a slight
rocking motion (the resistance is from a O ring).
7. Carefully withdraw the base assembly while noting the routing of the motor wires.
8. Unplug the micro connector from the motor controller board (the red and black
wires that leads to the motor-clutch assembly), and set the base aside.
9. Mark on the shaft the location of the bottom of the boot, then slide the boot
upwards exposing the loading coil.
10. Remove the remaining 6 screws on the antenna.
11. Carefully slide up the loading coil which also removes the motor-clutch assembly
(be careful with the alignment pin).
There is more than can be disassembled, but the above steps are all that is needed for
most maintenance and repairs. While you're in there, clean the moving surfaces up and oil
with a light oil (like mineral oil) that won't harm plastics while taking care not to
contaminate the contacts, coils and connections.

HOW DO I PUT IT TOGETHER?

1. Basically reverse the above procedure.
2. Be careful to make sure the alignment pin (about 7" long) from the loading coil to
the motor-clutch assembly is in place.
3. Pay special attention to the routing of the motor wires to prevent pinching
between the motor controller board and motor-clutch assembly.

ATAS100 Manual Tuning

The ATAS100 can be tuned up and down manually by holding in on the PTT switch and
using the UP/DOWN keys on the front of the radio. If you thought it meant the
UP/DOWN keys on top of the hand mic, you're not alone, as several others have made
the same mistake and the manual does not specify which UP/DOWN keys to use. It has
been noted that the P1/P2 keys on the mic will cause the antenna tune icon to come on if
you push them while holding the PTT, but they do not actually move the antenna.
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