Specifications

Chapter 1
Callsigns
Use of Callsigns
The use of callsigns within the UN system is mandatory. Callsigns uniquely identify
individuals, base stations and mobile units, and can be used throughout a
country/region. Callsigns are a convenient way of abbreviating station names, and
are an effective means of increasing the personal safety and security of individuals
and mobiles using the communication networks. Callsigns should always be used!!
When using callsigns with numbers included you should say the numbers individually
Example: EF 893 = Echo Foxtrot Eight Niner Three
The main difference between callsigns used on VHF and HF is as follows:
• VHF callsigns are issued to bases and individuals.
• HF callsigns are issued to bases and mobile units (vehicles/barges etc).
Callsign Structure
The objectives of a standard callsign system are as follows:
• Applicable worldwide.
• Requires minimum administration.
• Fast, flexible and easy allocation.
• Easy to use.
• Uniquely defines stations and users.
• Increases staff security.
• Augments operational effectiveness.
• Be applicable for UN and NGO’s.
On VHF & UHF we need to contact base station and individuals. On HF we need to
contact base stations and mobile units (usually vehicles).
The following callsigns are not suitable for use within the UN or NGO system:
Doctor, Zebra, Cobra, Zero etc.
Standard callsigns for VHF and HF Bases
Format: ABC
• A = Country
• B = Location
• C = Agency
Note: On local networks, “A” may be omitted.
Example: Kilo Foxtrot Base = WFP Kabul (VHF base)
Alpha Kilo Foxtrot Base = WFP Kabul (HF base)
Radio Operators Training Manual Version 27/11/2007 8