Installation Guide Part 3

NGL FX Installation Manual Rev. * 66 of 84
The set of switches under this tab are used to tune the system. Below is a description of each
switch.
Sample Holdoff
This setting adjusts the gap between the end of the transmit cycle and the time when the receiver is
enabled. The default setting of 17 (4.25us), but for the TR4215 the Sampling Holdoff should be
set to 13 (3.25us) and is used for both PX and QX pedestals.
In our system, this adjustment may be necessary due to the ringing that occurs after the transmitter
is disabled. This ringing could cause phantom alarms, and can be detected when viewing the DMS
Analog View “C”. By increasing the Sampling Holdoff setting, the effects of the ringing are
reduced. Care should be taken when increasing this gap to ensure a minimum loss of detection.
The range the DMS Sampling Holdoff setting is 1-31, which equates to a gap of 0.25
microseconds to 7.75 microseconds.
Sample Holdoff Setting
The default Sample Holdoff for the TR4215 is 17. For most of the TR4215 installation this could
be reduced to 13-14, but because of the nature of the FX System Antenna it would probably stay at
the default of 17. As with all installations, some experimentation can be done to find the optimal
setting. This is done by using the default setting of 17 and reducing the setting until an
unacceptable resonant appears. At this point increase the setting to the last value before the
resonance appeared.
Independent Antenna Alarm Switch
The Independent Antenna Alarm is used to either configure the system to simultaneously transmit
on both ports (TX1and TX2) if disabled or alternate transmission on both ports if enabled. For an
ECO system it has been found when both pedestals transmit at the same time, false alarms could
occur on the adjacent pedestal when a tag is introduced to the other pedestal. This is unacceptable
for an Inlane System.
Since the TR4215 only supports the ECO Mode (PAB/SAB configuration) this switch must
always be enabled.
After setting the switches as desired, click Apply.
Independent Antenna Alarm Setting
The Independent Antenna Alarm setting is used to eliminate the chance in a PAB/SAB
configuration to receive the wrong or redundant alarm event record for a given alarm. This occurs
because of the nature of the ECO system allowing one RX/TX port to drive both 2 and 3 loops in a
pedestal. For the FX System each RX/TX port will drive an independent loop antenna. For this
case and the nature of a floor system, a redundant alarm is not critical. For this reason this
setting should be set to disabled.
Switch Settings Alarm Tab