1-8 - PPT - Basic Radio Net & Establishing Comms.pptx

Cis

1. Basic Radio Net & Establishing Comms

2. Aims By the end of this lesson, you will be able to: Describe a simple radio net Draw the layout of a simple net Explain the two station types Establish communications So that you can check communications and operate on a simple radio net

3. Types of Station There are two types of radio station on a net: Control station: has the authority and the responsibility for controlling communications, the flow of message traffic, and enforcing radio discipline. There is only one control station, usually at HQ Sub-station: All other stations on a net are subordinate to, and must obey orders from, the control

4. The Radio net A radio net is a number of stations grouped together for the sole purpose of communicating with each other On a simple net, all stations are on the same frequency: Control Station Substation(s) Ø L3Ø P3Ø W4Ø f1 f1 f1 L2Ø P4Ø f1 f1

5. Any Questions? ?

6. Establishing Comms Before traffic is sent over a net, stations may need to check communications. Why do you think they might need to do that? Is everyone on the right frequency? Are people within range of each other? Is everyone’s radio working correctly? The process for checking communications is called a RADIO CHECK

7. Radio check The radio check is started by using the prowords RADIO CHECK - this means ‘report the readability of my transmission to you’ Each callsign in the radio check then responds with a proword giving a readability report: OK ‘Your transmission is satisfactory’ DIFFICULT ‘Your transmission is workable but with difficulty, requiring extra care’ UNWORKABLE ‘I am unable to receive message traffic from you until communications between us have been improved’ Once all the stations have responded in order, the station who started the check will respond with a readability report for each station, as communications might be different in each direction If a station wasn’t heard at all, then the proword NOTHING HEARD is used

8. Example Ø: Hello all stations this is Ø, radio check over A2 Ø : A2 Ø , OK over C22D: C22D, OK over D1 ØC: D1 ØC, OK over D11D: D11D, OK over Ø: Ø, OK out Ø, A2Ø, C22D, D1ØC, D11D

9. Example Ø: Hello all stations this is Ø, radio c heck over C2 Ø : C2 Ø , OK over C22B: C22B, difficult over E12 C: E1 2C, d ifficult over J12D: J12D, OK over Ø: Ø, C22B nothing heard , E12C difficult out Ø, C2Ø, C22B, E12C, J12D

10. Example Ø: Hello all stations this is Ø, radio check over A1Ø : A1 Ø , difficult over B3Ø : B3Ø, OK over B32 C: B3 2C, OK over E22D: E22D, OK over Ø: Ø, A1 Ø difficult out Ø, A1Ø, B3Ø, B32C, E22D

11. Any Questions? ?

12. Summary You can now draw a simple radio net You are now able to carry out a comms ‘radio check’

13. Final Confirmation W ha t are the two types of station? What are the three responses to a radio check? If the response to a radio check is difficult, what should you do?