Aligning Tx Wireline; Aligning Rx Wireline; Tuning A Preselector - Motorola GTR 8000 Manual

GTR 8000 Base Radio
See Base Radio Service Help > Service Screens > Alignment Screens in the CSS Online Help for the alignment
procedures.

5.6 Aligning Tx Wireline

Tx Wireline Alignment is used to set the levels which will result in 60% system deviation for both Wireline Level
Line 1(WL1) and Wireline Level Line 3 (WL3) and for setting the Wireline Squelch levels.
See Base Radio Service Help > Service Screens > Alignment Screens in the CSS Online Help for the alignment
procedures.

5.7 Aligning Rx Wireline

Rx Wireline Alignment is only used for a base radio that processes analog receive audio and is connected with a 2- or
4-wire link to a console or a comparator in an analog only topology or an ASTRO
See Base Radio Service Help > Service Screens > Alignment Screens in the CSS Online Help for the alignment
procedures.

5.8 Tuning a Preselector

The optional VHF or UHF preselector assembly is mounted on the back of a base radio or base receiver. The
preselector assembly is a 3-pole (UHF) or a 5-pole (VHF) bandpass filter equipped with tuning slugs to adjust the
passband corresponding to the operating frequency(s) of the base radio. The preselector assembly must be field
tuned if replaced in the field or if the base radio operating frequency(s) are modified.
Tuning for best SINAD or BER response DOES NOT result in optimum tuning of the preselector assembly.
You must use this field tuning procedure to obtain optimum preselector performance.
The following test equipment is required to properly tune the preselector assembly:
• RF Signal Generator - Aeroflex 3900 Series Service Monitor
• Dip/peak Monitor - HP435B Power Meter (or equivalent) with HP8484A sensitive power head, Boonton
Model 92E with BNC input, or Aeroflex 3900 Series Service Monitor using the spectrum analyzer function
• Torque driver capable of delivering 12 in -lbs of torque and 10 mm deep well socket
• Tuning probe - Motorola Part No. 3082059X01, p/o TRN4083A tuning kit
• Flat-blade screwdriver
An R2600 Communications Analyzer can both generate and measure simultaneously. A service monitor
may be used for either the generator or the monitor function, but not both simultaneously. When using
service monitor as the signal generator, RF signal must be taken from the Antenna port.
5-4
®
25 Analog/Mixed mode topology.
6871022P86-A - November 2012