User's Manual Part 3

113
CALIBRATION PROCEDURE
In order to calibrate PBN153/44, a double-track Network Analyser is needed, in order to visualize the
frequency response of the passing and reflected signals.
- Calibration procedure from 470MHz to 666MHz
1. Extract the coupling 5 (Fig. 1) until it stops.
2. Insert the couplings 3, letting about 5mm out.
3. Connect the filter to the Network Analyser marking the input. Select the frequency of the desired channel
centre and set a SPAN of 50MHz.
4. Act on the tuning rods 1 and 2 until the curve of the band-pass appears in the centre of the screeen, and
adjust it by means of the couplings 3 to obtain a width of about 10MHz (Fig. 2).