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C-11

Chapter 11. Block Description

11.1 Communication unit: FB-2000····································································11-1

11.1.1 IF: 16P0275·························································································11-2

1. IF Transmitting Circuit·············································································11-3

2. IF Receiving Circuit·················································································11-4

3. 42V ·········································································································11-4

4. ASK (Amplitude shift keying) ··································································11-5

11.1.2 MODEM: 16P0274 ··············································································11-6

11.1.3 HUB: 16P0273·····················································································11-8

11.1.4 POWER: 16P0226·············································································11-10

1. Output Specifications············································································11-11

2. Other Specifications·············································································· 11-11

3. Adjusted Parts······················································································· 11-11

11.1.5 PANEL: 16P0227···············································································11-12

1. SIM ·······································································································11-12

2. LED·······································································································11-12

3. Reset SW ·····························································································11-12

11.1.6 Handset: FB-8000 ·············································································11-13

11.1.7 Incoming Indicator: FB-3000······························································11-14

11.2 Antenna Unit: FB-1500/1250····································································11-15

11.2.1. Overview···························································································11-15

1. The Functions for the Major module ·····················································11-15

2. Transmitting and Receiving Circuit ·······················································11-16

11.2.2 Satellite Acquire Sequence································································11-20

1. Outline of the Sequence for Capturing the Satellite······························11-21

2. Command·····························································································11-22

Furuno FELCOM 250 Service Manual

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