Uhf Duplexer Low Notch Loop Assemblies Tuning Set Up; Figure 74: Test Equipment Set Up For Tuning Uhf Duplexer Low Notch Loop Assemblies; Tuning Uhf Duplexer Low Notch Loop Assemblies - Motorola ASTRO 25 GTR 8000 Manual

MN003286A01-E
Chapter 5: GTR 8000 Base Radio Optimization
5.10.5.5

UHF Duplexer Low Notch Loop Assemblies Tuning Set Up

Figure 74: Test Equipment Set Up for Tuning UHF Duplexer Low Notch Loop Assemblies

5.10.5.5.1

Tuning UHF Duplexer Low Notch Loop Assemblies

Procedure:
1 Set up test equipment as shown in
Low Notch Loop Assemblies on page
2 Using a screwdriver, adjust the notch adjustment screw for cavity #4 to obtain a minimum
reading on the millivoltmeter. (Reduce the range on the millivoltmeter as necessary to reach true
minimum reading.)
3 Using an open-end wrench, carefully tighten the lock nut ensuring the notch adjustment screw
does not shift position.
4 Repeat steps 2 and 3 for cavities 5 and 6.
180
Figure 74: Test Equipment Set Up for Tuning UHF Duplexer
180.