VHF COMMUNICATION SYSTEMS

VHF Communication Systems

VHF Communication Systems

The VHF Communication System comprises of:

1.              two VHF-4000 tranceivers (VHF COM1 and VHF COM2),

2.              two VHF antennas.

The VHF COM transceivers are remote-mounted multichannel VHF voice transceivers that supply AM voice communications. The VHF COM transceivers are adept to function from 118.00 to 136.975 MHz in 25 or 8.33 kHz steps. The COM transceivers purposes are controlled through the Radio Tuning Unit (RTU, namely the on-side command for COM1) and the Control Display Unit (CDU, namely the on-side command for COM2). Controls encompass the backgrounds of wireless frequencies and operational modes (www.vhfcomm.co.uk). The CDU and RTU supply command of both on-side and cross-side wireless from the navigate or co-pilot position. Each Tuning Unit carries full reversionary tweaking for the traverse edge wireless, in case of traverse edge unit failure. In supplement to the wireless frequencies offered with diverse navigational exhibitions on the PFDs, the present VHF COM1 and COM2 frequencies are shown in green along the base of both PFDs (home.planet.nl).

The VHF COM1 scheme is supplied with electric power furthermore in case of a twice generators failure. Furthermore, in case of total decrease of airplane DC power causes (DC generators and battery) the COM1 transceiver is mechanically swapped to the Emergency Power Bus (powered through an EPU) to guarantee not less than 30 minutes of operative time for communications on 121.500 MHz crisis frequency. In crisis situation the VHF COM 1 transceiver can be functioned via the "EMER COMM1" defended pushbutton, accessible on the Miscellaneous/ Reversionary Panel (media.ofcom.org.uk). When the "EMER COMM1" function is endowed, the transceiver is "forced" to function on 121.500 MHz VHF/AM crisis frequency, individually from the operative rank and backgrounds of the CDU/RTU. The Master Avionics swap on the Master Control Panel encompasses the "COM1 only" place, to permit ...