User's Manual Part 1

40
UHF DTV BANDPASS FILTER 06655A
TECHNICAL DATA
Frequency Range 470 - 862MHz SWR < 1.22
Configuration 6 Cavities elliptical 2
nd
Harmonic Attenuation > 80dB
Bandwidth 6 to 8MHz Group Delay Variation < 250ns
Max Output Power 2.5kW (rms) Temperature Stability < 1.5kHz / K
Insertion Loss f(0) < 0.3dB Ambient Temperature Range -10° to +50°C
Attenuation f(0) ±3.8MHz < 0.8dB (SWR 1.22), < 1dB (SWR 1.18) Weight 35kg
Attenuation f(0) ±4.2MHz > 5dB (SWR 1.22), > 6dB (SWR 1.18) Working Position Any
Attenuation f(0) ±6MHz > 30dB (SWR 1.22), > 35dB (SWR 1.18) Dimensions Max 370 x 372 x 564mm
Attenuation f(0) ±8MHz > 45dB (SWR 1.22), > 50dB (SWR 1.18) Output Connector EIA 1+5/8” Unflanged
TUNING INSTRUCTIONS
To calibrate the filter PBN153/45-6C/58, a double-track Network Analyser is needed, in order to display
the frequency response of the passing signal and the reflected one. The filter is composed by siz band-pass
cavities with coupling between intermediate cavities.
 Connect the filter to the Network Analyser, marking the input. Select the middle frequency of the channel
range in the middle of the screen and set a SPAN of 50MHz.
 Turn the coupling (4) (fig. 1) to the end.
 Act on the tuning rods (1) (fig. 1) until the curve is displayed at the center of the screen, then act on the
interstage couplings (2) and on the IN/OUT couplings by rotating the screw (3) to obtain a band width of
about 8MHz.
 Set the instrument for a SPAN of 20MHz, move the markers to the limits of the used band (Fo ±3.9MHz).