2182kHz). Some equipment may label this control VSB while others
may label it SSB.
R3E - SSB voice, with 'reduced' carrier - is used when setting-up
a link call, or an inter-ship call - only when the receiving station asks
for a carrier for tuning purposes (sending a reduced carrier will put a
tone on your voice signal, allowing the receiving station to tune-in to
the dead-beat, which will match their receiver to your transmitter
frequency, exactly).- Choose FIB for DSC and TelexlNBDP communications. Some
equipment may label this control TELEX or TLX.
• AlA (sometimes labelled CW) usually means a morse code service
- and is also used by some time-signal stations to provide the 'tick
tick' to help you check your chronometer, if ever the GPS systems
fails to provide position/time information.
H3E (SSB Voice, with Full Carrier - sometimes labelled AM) -
not used for transmitting on marine bands. Now used only when
receiving broadcast stations (such as the BBC World Service) and for
some time signal stations which broadcast composite emissions using
voice and telegraphy (voice on the Upper Side Band (USB) with the
carrier providing the 'tick tick').
5 Transmitter/Receiver Frequency Selection: To tune a transmitter
frequency, press Tx, key-in the required frequency (including, if
required, an extra zero to put the decimal point in the correct place)
and end with the Enter key. To tune the receiver frequency, press the
Rx button, key in the frequency required (remembering the decimal
point), and Enter. If the channel (pair of frequencies) you require is a
recognised ITU Channel, the transmit and receive frequencies are
pre-programmed into your equipment and can be recalled by using
the RCL key (sometimes labelled ITV) and Enter. The 2182 button
allows you to select the MF Voice Distress Frequency, qUickly - but
check that your equipment also selects full power andJ3E when you
use the 2182 button.
6 1\me: Pressing the Tune button after setting the Tx/Rx frequencies
will set the Antenna Coupler/ ATU correctly for the chosen frequency.
(Note that this tunes the antenna to the transmit frequency (not the receive
frequency) though, when both are very close together (as with link-call channels),
this tuning improves both transmitter and receiver performance (Single antenna
140 THE NAUTICAL INSTITUTE