User's Manual

P B L Tunnel Units 1 & 2

Maintenance Handbook

H/book Number:-60-056100HBKMFCC

Issue No:-2

Date:-04/01/2006

Page:-

26 of 63

5.2.2 Two Section Notch Filter (02-010401)

5.2.2.1 Description

Fitted in Unit 2 after the amplification stages is a 2 element notch filter (one in downlink,

one in uplink), which is designed to reject the uplink frequencies in the downlink path

and vice-versa. The notch filter is not required for Unit One as the rejection from the two

series bandpass filters as apposed to one, is sufficient to meet the specification.

5.2.2.2 Technical Specification (Uplink)

PARAMETER SPECIFICATION

Frequency range: 485.2-485.6 MHz

Stopband: 482.2 – 483.6MHz

N. of sections: 2

Attenuation: >40dB @ 482.2MHz

Insertion loss: 0.5dB

VSWR: Better than 1.2:1

Connectors: SMA

Power Handling: 50W maximum

operate

-10°C to +55°C

Temperature

range:

store: -30°C to +70°C

Weight: <3 kg

Size: 384 x 82.5 x 56.4mm

5.2.2.3 Technical Specification (Downlink)

Frequency range: 482.2-483.6 MHz

Stopband: 485.2-486.6MHz