User Manual

Fibre Optic Master and Remote Site
User Handbook
Document Number: 60-212701HBK - Issue No. 1 Page 26 of 50
4.2.4. 60-212802 Major Sub Components
4.2.4.1. Bandpass Filter (02-010901)
Bandpass Filter (02-010901) is a multi-section design with a bandwidth dependent upon the
passband frequencies, (both tuned to customer requirements). The response shape is basically
Chebyshev with a passband design ripple of 0.1dB. The filters are of helical & combline design
respectively, and are carefully aligned during manufacture in order to optimise the insertion loss,
VSWR and intermodulation characteristics of the unit. The body and tuned elements are silver-plated
to reduce surface ohmic losses and maintain a good VSWR figure and 50ȍ load at the input and
output ports.
Being passive devices, the bandpass filters should have an extremely long operational life and require
no maintenance.
02-010901 specification
SPECIFICATION PARAMETER
Uplink 505.4 to 505.8MHz ** Passband Frequency
Downlink 502.4 to 502.8MHz **
Uplink 400kHz ** Bandwidth
Downlink 400kHz **
Insertion Loss 1.2 dB (typical)
Power Rating 50W
Impedance 50ȍ
VSWR Better than 1.2:1
Connectors SMA
Weight 3Kg (approximately)
**as tuned for use in 60-212802 uplink and downlink paths
4.2.4.2. Bandpass Filter (02-011204)
Bandpass Filter 02-011204 is a multi-section designs with a bandwidth dependent upon the passband
frequencies, (both tuned to customer requirements). The response shape is basically Chebyshev with
a passband design ripple of 0.1dB. The filters are of combline design, and are carefully aligned during
manufacture in order to optimise the insertion loss, VSWR and intermodulation characteristics of the
unit. The cases and tuned elements are silver-plated to reduce surface ohmic losses and maintain a
good VSWR figure and 50ȍ load at the input and output ports.
Being passive devices, the bandpass filters should have an extremely long operational life and require
no maintenance. Should a filter be suspect, it is usually most time efficient to replace the module
rather than attempt repair or re-tuning. No adjustments should be attempted without full network
sweep analysis facilities to monitor both insertion loss and VSWR simultaneously.
02-011204 Specification
Passband Frequency 502.4 to 502.8MHz **
Bandwidth 400kHz **
Insertion Loss <1.0dB
Power Rating 100W
Impedance 50ȍ
VSWR 1.2:1 (typical)
Connectors SMA
Weight 3Kg (approximately)
**as tuned for use in 60-212802 uplink path