Brukerveiledning

The goal is to keep M2 better than -1.7 dB (for example, -1.3 dB) and M1 less than -65 dB (for
example, -67 dB). See Figure 25: Example for HIGH Port Tuning of the UHF Duplexer on page
72.
Figure 25: Example for HIGH Port Tuning of the UHF Duplexer
a Using the three T10 tuning screws on the LOW side, tune M2 for best insertion loss, s21,
while keeping the isolation (M1) better than 65 dB.
The results should be better than -1.7 dB. Shorter screws (turned clockwise) are for a lower
frequency and longer screws (turned counterclockwise) are for a higher frequency. Keep all
three screws for each port at about the same depth when tuning each section. Later in this
tuning process you may notice that the three LOW port screws are shorter than the three
HIGH port screws.
b Connect the LOW side cable of the duplexer to port 1 on the network analyzer.
c Connect a 50 ohm load to the HIGH side of the duplexer.
The goal is to keep M1 better than -1.7 dB and M2 better than -65 dB. See Figure 26:
Example for LOW Port Tuning of the UHF Duplexer on page 73.
MN003557A01-AL
Chapter 8 : SLR 1000 Programming and Tuning
72
Applicant: Motorola Solutions
Equipment Type: ABZ99FT3096B / 109AB-99FT3096B
Tune-Up Procedure
Exhibit D1 9 of 11