Harris Ranger Series, Commissioning Manual

Page: 44 / 162

2-18 888-2685-001 12/24/07
WARNING: Disconnect primary power prior to servicing.
Section 2 Installation Verification &
Ranger Commissioning Manual
Figure 2-10 on page 2-18 shows two methods of distributing the 1PPS signal.
Figure 2-10 1PPS Signal Termination Methods.
2.11.1.4 Verify Exciter Configuration
The APEX exciter is configured using the LCD touch screens on the front of the
exciters. The basic functions of these screens are discussed in the Apex Mobile
Technical Manual 888-2604-001. It is necessary to be familiar with these screens in
order to configure the exciter. The following steps are simply a configuration checklist
and should be performed prior to turning on the transmitter PA’s.
GPS 1PPS
Source
Apex
Exciter
For a single 1PPS run from source to exciter, set the exciter FPGA modulator
board 1PPS input termination jumper (JP1) to position 1 - 2 (50 ohm termination).
GPS 1PPS
Source
Apex
Exciter #2
Apex
Exciter #1
For a two exciters, the 1PPS signal can be bridged through exciter 1,
1. Keep the tee connector close to exciter 1’s 1PPS connector (within one foot)
position 2 - 3 (high impedance).
to avoid the ringing problem.
3. Set exciter 2’s FPGA modulator board 1PPS input termination jumper (JP!) to
position 1 - 2 (50 ohms).
2. Set exciter 1’s FPGA modulator board 1PPS input termination jumper (JP!) to
Do not position the tee connector more than one foot from exciter 1,
because this will aggravate the ringing problem.