1. Single and Multi Channel Radios enable voice comms to/from ATC to aircraft Cossor Radios

2. UK FRR 619 & 620 • Single Channel Rx • United Kingdom Fixed Radio Receiver • 619 – VHF Receiver • 620 – UHF Receiver

3. UKFRT 621 & 622 • Single Channel Tx • United Kingdom Fixed Radio Transmitter • 621 – VHF (117 – 137 MHz) low power 20 Watts • 622 – UHF (225 – 400 MHz) low power 20 Watts

4. UKFRT 623 & 624 • Single Channel Transmitters with 100 Watt Amplifiers attached. • Improves range to approx 60 miles

5. Single Channel Disadvantages • Time consuming to set up • Transmitter subject to valve aging • Restricted to one frequency • Prone to tripping

6. Cossor Multi-Channel Airfields Air Defence Radar sites (including Convoys) Where is it located?

7. Equipment Frequency Range • Freq:- • 117-136.975 MHz (VHF) • or • 225 - 399.975 MHz (UHF)

8. Equipment Power • Power O/P • UHF 20 Watts or 100 Watts • VHF 20 Watts only Amplitude modulation

9. The equipment can be operated locally • By the use of a plug in hand held mic. for TX. • By the use of earphone headset for RX.

10. The TX & RX equipment can be operated remotely. • By the use of BT lines for Audio. • By the use of BT lines and or Data link for frequency selection.

11. Equipment Configuration • Stand alone TXER, local or remote operation for both audio and frequency change data. • Stand alone RXER , local or remote operation for both audio and frequency change data. • Transeiver (TX/RX integrated system) local or remote operation. For both audio and frequency change data.