ADJUSTING THE OUTPUT DRIVING POWER
The following paragraphs explain how the KW948 may be adapted to suit different repeaters. To date the
default values have never been changed.
This is now coming to the more technical aspects of the interface. If the repeaters fail to follow on fast turns
then perhaps they need to be driven harder, by forcing more current into the windings, and for longer. This is
made possible by changing some locations in the EPROM. CAUTION. The repeater motors will run hotter
the higher power you use.
SETTING THE EPROM PRESET LOCTIONS
This table is for reference but may easily be used by AMI’s expert dealers to program eproms. If anyone
wants a perfect solution for a particular repeater send it to me and I will do the necessary adjustments.
Location
55 hex
56 hex
57 hex
58 hex
Description
PWM pulse width
when stopped
(x 0.25 mS)
PWM width (x
0.25 mS)
Follow up rate per step
(x 0.25 mS)
Step drive width
during turning (x 0.25
mS)
Default or
typical value
2
10 Hex = 16
decimal
10 Hex = 16 decimal
5
What it
means
The holding voltage
and hence current
depends on this
value.
This must be
greater than
location 55.
16 x 0.25 = 4 mS per
step. This gives the 5/10
deg/sec default follow
up rate.
The greater this value
the greater is the
current in the motor
during turns
