HATS Type 4128-C, Handset Positioner Type 4606 – User Manual40
sockets are shaped to prevent the centering fork being mounted in a reversed position, which
would change the direction in which the centering mechanism functioned.
The supports help to position the handset under test before it is clamped in place with the forks.
The supports can be extended or retracted using the adjustment knobs at the bottom of their
shafts.
To prevent damage to the handset under test, a friction lock is used to limit the amount of
pressure the supports can apply. At the top of the supports are the support feet, which can be
slid laterally on a ratchet. The feet are marked with a graduated scale. Spikes (see Fig.4.2) are
plugged into the feet to support the phone. The general method is to support the phone in three
places on the spikes which come in two lengths, 5mm and 20 mm. When fitting the spikes into
the support feet, twisting them slightly on insertion ensures that they seat properly. The front
support (closest to the end stop) is positioned to be directly under the handset’s ECRP when the
handset is correctly mounted in the cradle. The rear support (opposite end to the end stop) can
be positioned in any one of the five sockets available for the centering forks and is held in place
with a knurled locking ring similar to those used on the centering forks.
The end stop works in the same way as the supports, only in the horizontal plane, and controls
the positioning of the phone along its longitudinal axis.
The centering forks, supports, and end stop all have laser etched graduations on them that allow
you to read and duplicate their settings. This makes handset positioning repeatable as you only
have to repeat these settings to locate the handset in exactly the same position.
4.1.3 Cradle Positioner Assembly
Fig.4.4
Cradle Positioner
Assembly showing two
single plane, graduated
swivel joints
Fixing
knob
Badjustment
Cadjustment
½
graduations
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