Furuno Felcom 250 Service Manual page 53

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
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