Chapter Index

Chapter

The United Kingdom Warning and Monitoring Organisation

• History of the UKWMO
• How the UKWMO fits into UK war emergency structure
• The Royal Observer Corps function in UKWMO
• ROC Group HQ bunkers and their locations
• On screen maps of monitoring posts (printable maps available in Documentation Library)

Chapter

British Nuclear Warning System

• Development of the UK national warning system
• Detection of an incoming attack
• Field trial of a public warning carrier system WB200
• Development of HANDEL, UK wide broadcast network to 250 control points
• Initiating the Attack Warning, Fallout Warnings and All Clear
• Function of the Carrier Control Point (CCP)
• List of CCP's
• Overview of 1st & 2nd generations of warning system.

Chapter

The ROC Nuclear Monitoring Post

• Physical appearance
• Monitoring Instruments
• Overview of communications, detailed in other chapters
• Their role in warning public

Chapter

UKWMO Group and Sector HQ

• The ROC Group HQ functions
• Calculating bomb size, height and location
• Plotting fallout. Comparing fallout predictions with live data
• Warning the public via carrier control points
• Overview of communications, detailed in other chapters

Chapter

Nuclear Reporting Cell

• NRC Locations
• UKWMO feeder groups

Chapter

Cold War Regional Government

• Regional government replacing national government
• Local government
• Overview of communications, detailed in other chapters
• Radio communications in the military UHF band, ARC52

Chapter

Regional Government Bunkers

• Their locations
• Use of former ROTOR radar bunkers
• Other bunkers and tunnels

Chapter

Central Government War HQ - Corsham

• Location and layout
• Communications overview
• Preservation by Historic England

Chapter

BBC Wartime Broadcasting Service

• Timings for the introduction of WTBS service
• The 1953 map of transmitters
• The 1976 transmitter network

Chapter

First Generation HANDEL and Carrier Broadcast

• HANDEL, P+Q tones, speaking clock
• WB400 Carrier Control Point (CCP)
• WB600 Siren Control
• Police functional test of system
• WB400 Control Point Exchange (CPE) equipment and function
• WB400 Carrier distribution between exchanges
• Carrier distribution to warning points
• WB400 Speech receiver and instruction leaflet
• WB600 Siren receiver
• Warning point hardware
• Test equipment used by GPO engineers

Chapter

Second Generation HANDEL and Carrier Broadcast Part-1

• HANDEL The WB1800 Network and Control Console
• Quarterly Testing of HANDEL network
• WB1400 Carrier Control Point (CCP)
• Police functional test of system
• CCP Users training box
• WB1400 Control Point Exchange (CPE) equipment and function

Chapter

Second Generation HANDEL and Carrier Broadcast Part-2

• Carrier distribution between exchanges
• Carrier distribution to warning points
• WB1400 & WB1401 Speech Receiver
• Comprehensive warning point instruction manual
• Power siren control signals
• WB1400 Signalling Receiver for Sirens
• Fault monitoring
• Test equipment used by BT engineers

Chapter

Miscellaneous Wire Broadcast Systems

• WB300 Nuclear radio leak warning
• WB500 Electricity load control trial
• WB700 GPO local call timing period
• WB800 Piped music to shopping centres
• WB900 Pair gain 1 plus 1
• WB1000 Burglar and fire "Alarms By Carrier" (ABC)

Chapter

Power Operated Siren Part 1 - The Air Raid Siren

• Photo gallery of UK cold war sirens
• Thermostats and defrosting heaters
• Field trial of German pneumatic sirens
• Audible testing of UK sirens abandoned and never resumed
• Sirens in Essex.

Chapter

Power Operated Siren Part 2 - Control Gear

• UK Air raid siren station
• Electrical Switchgear for siren
• Home Office standard "Autowailer"

Chapter

Hand Operated Sirens

• Carter hand siren
• Secomak hand siren

Chapter

ROC Post Landline Communications

• Telephone Observer AD163 from WWII
• 1st Generation teletalk and switched landlines
• 2nd Generation teletalk and permanent landlines

Chapter

ROC Post Radio Communications

• 1st Generation high-band radio
• 2nd Generation low-band radio

Chapter

1st Generation Speech and Telegraph Networks

• Separate networks used by RGHQ and UKWMO
• 1st Generation telephone network
• GPO EMSS Overview, detailed in own chapter
• Torn tape message centres
• Mechanical teleprinters
• Overview of Speech and Telegraph, over same wires. Detailed in own chapter
• Radio backup to landlines
• 1st Generation radio network diagrams

Chapter

Second Generation Speech and Telegraph Network

• Combined national network integrating RGHQ and UKWMO
• 2nd Generation telephone network - the ECN
• Post cold war use of ECN
• 2nd Generation telegraphy with computerised message switch
• Telegraph message formats, routine and ACP126
• County wide telegraph network
• 2nd Generation radio network RN1 & RN2
• Onsite security radio RN3

Chapter

GPO, Post Office Telephones and BT

• Company history
• Public telecoms 1960-1990
• Quick links to "Home Defence Projects" chapters

Chapter

War Resilient Communications

• Why needed
• Chronology of GPO works
• Birmingham Anchor
• London Kingsway
• Manchester Guardian
• Protected Repeater (PR) stations
• Locations of PR buildings

Chapter

Telecommunications Emergency Power Supplies

• Typical arrangement
• Mains supply and standby generator
• Mains power units
• Battery standby

Chapter

The Emergency Manual Switching System - E.M.S.S.

• Basement telephone switchboards
• Customers Lines to EMSS
• EMSS Network diagrams
• How EMSS served CGWHQ at Corsham

Chapter

The All Underground Network

• Carrier telephony in the UK
• Purpose of the "All Underground" network
• Digital Modernisation

Chapter

GPO / BT Long Haul Microwave Network

• Public network
• Defence "backbone" network

Chapter

Telephone Preference Scheme

• Why needed in the analogue network
• Preference categories

Chapter

GPO / BT Defence Network

• Network funding
• Defence Network Structure
• Area War Group, function and communications
• BT War Emergency Procedure

Chapter

MOULD Home Defence Radio

• MOULD Phase 1
• Network Design
• MOULD Phase 2
• Civilian Access
• Regional maps and frequencies

Chapter

CONRAD Post Strike Government Comms

• The network
• Maintaining secrecy before bringing into action
• Avoiding EMP damage
• Message security
• Staffing numbers
• CONRAD vehicles

Chapter

Home Office - Emergency Services Radio

• Overview
• Callsign plan
• Quick Links to analogue services chapters

Chapter

Pre 1987 Emergency Services Radio (100MHz)

• Arrangement for county wide schemes
• Radio Link Assembly (RLA)
• Examples of county wide frequencies
• Radio equipment hardware

Chapter

Post 1987 Emergency Services Radio (150MHz)

• Arrangement for county wide schemes
• Equipment changes
• Examples of county wide frequencies

Chapter

Last Ditch Radio Network

• Reports in the archives
• SSB125 Radio equipment
• Proposed replacement RN5

Chapter

Pre-Carrier Systems, Remote Control of Sirens

• WWII History of Siren Control
• Description of GPO System E
• Tiered network for System E

Chapter

Interim Civil Defence Radio Scheme

• Outline of requirement
• Regional radio scheme
• Frequencies and masts needed

Chapter

My Search for the ROC Inter-group Radio Links

• Background to 1970's public radio
• Hunting for aerial masts
• Hunting for radio frequencies
• Finding and missing RGHQ locations
• Detail map of radio links and frequencies

Chapter

Lines carrying both Speech and Telegraph signals

• The principles of S+DX
• Hardware
• S+DX and standby to landline radio links

Chapter

Multi-Channel Speech Multiplex

• Human voice and hearing
• Analogue Frequency Division Multiplex (F.D.M.)
• Speech Multiplex techniques
• Carrier Line Systems
• Coaxial Cable Systems
• Practical Example

The Documentation Library

• Index Page
• Printable Maps of Cluster and ROC, RGHQ Boundaries
• Telecom Instructions for WB
• WB Circuit Diagrams
• ROC Documents