Sweeping DB-4072 UHF Duplexer Using Synth Sig Gen and Spec An 03-16-2011

Sweeping the Antenna to Tx (Transmit) port of a Decibel Products DB-4072
6-cavity duplexer.

The HP 8660C signal generator setup is:

Center Frequency = 445.100 MHz
Sweep width = 10 MHz
Step size = 100 kHz
RF Output = -20 dBm
Single Sweep, Slow

The HP 8591E spectrum analyzer setup:

Center Freq= 445.100 MHz
SPAN = 10 MHz
RF Ref Lvl = -20 dBm
CH A Max Hold

The duplexer was tuned to two frequencies 5 MHz apart

Duplexer tuning: RX Freq = 447.600
Duplexer tuning: TX Freq = 442.600

Notch depth measures over 75 dB on this port (greater than 75 dB attenuation of TX carrier at the RX frequency)

Sweep of Rx port see: http://www.youtube.com/watch?v=yc8-3f6VOQs

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Category:

Science & Technology

Tags:

• ham radio
• spectrum analyzer
• UHF repeater
• HP 8591E
• HP 8660C
• RF Measurements
• Duplexer tuning
• DB-4072
• DB4072