User's Manual Part 2

Troubleshooting
G
ATEKEEPER SYSTEMS INC.
2007
CART CONTAINMENT MANUAL
Page 76
Analog wheels (Red in color) are NOT compatible with any other version of Gatekeeper wheel. If you are
providing service at an analog store, the only wheels that will work are the RED analog wheels. Grey or black
wheels will not work.
All versions of Grey and Black colored wheels will lock in a GS System digital environment; however, they will
react to the encoded signal at different ranges. The chart below indicates the locking range of three versions of
digital Gatekeeper wheels, in an environment with a 2,400 foot locking line and 40 feet of twisted pair.
D-9110 Digital 2400' with 40' of Twisted Pair
0.00
5.00
10.00
15.00
20.00
25.00
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 6.5
Transmitter Setting
Lock Distance (feet)
GS2 Wheel GS1 Digital GS1.1 Digital
Wheel locking distance as a function of transmitter setting
When servicing a digital store, it is important to note the type of wheel present at the store, before you replace a
wheel. As shown in the graph above, a GS2 or GS1.1 wheel will recognize the locking signal much closer to the
perimeter antenna than a GS1 Wheel. It is possible that a GS1 wheel will lock at the perimeter antenna, but that
a GS1.1 or GS2 wheel will not. The transmitter will need to be adjusted to allow for a locking range of
approximately one to two feet (1’ to 2’) for the GS1.1 or GS2 and three to four feet (3’ to 4’) for the GS1. So, in
the example illustrated above, you would adjust the CentralTransmitter to a pot setting of approximately 1 to
1.25, to achieve a locking range of two feet (2’) for the GS1.1 or GS2 and four feet (4’) for the GS1.
It is important that you NEVER leave a store without first checking the locking range of different wheel versions,
at several different locations on the perimeter antenna.