R Mod : 0032 or 2267 or 4331
ATR 42 Model : 500
GENERAL
COMMUNICATIONS
P 11
NOV 01
090
1.05
.
10
HF CONTROL BOX
(1)
ON/OFF and CLARIFIER knobs
- Inner knob turns ON and OFF the system, and controls the volume.
- Outer knob (clarifier) adjusts received frequency in case of single sideband operating
mode.
(2)
SQUELCH/FREQ-CHAN selector
- Inner knob allows to reduce background noise when not receiving a signal.
- Outer knob selects chanel mode or discrete frequency mode of operation.
FREQ : selection knobs (3) allow to directly select used frequency
(displayed on (4)).
CHAN: selection knobs (3) allow to select :
- Either a 2-digit channel number (displayed on (6) received to store a
frequency on this channel.
- Either a 4-digit ITU (Maritime) channel number (displayed on (6/7))
corresponding to a duplex function : on each ITU channel, a received
frequency and a transmit frequency are automatically stored.
When an ITU channel is selected, received frequency is displayed on (4).
When transmitting, transmit frequency is displayed on (4).
(3)
CHANNEL/FREQUENCY selection knobs
- When FREQ/CHAN selector is in FREQ" position.
Left outer knob : Selects and displays the MHz digits (1 through 29).
Left inner knob : * Pushed in : selects the 100 Hz digits (0 through 9).
* Pulled out : selects HF modes (USB, AM or LSB).
Right outer knob : Selects and displays the 10 KHz digit (0 through 9).
Right inner knob: * Pushed in : selects the 1 KHz digit (0 trough 9).
* Pulled out : selects the 100 Hz digit (0 through 9).
- When FREQ/CHAN selector is in CHAN" position.
- Left outer knob : Selects the ITU band (first two digits) in case of ITU channel
selection. When turned down, the two first digits disappear,
and right outer knob displays a storing channel.
Left inner knob
: * Pushed in : has no effect.
Left inner knob
: * Pulled out : selects modes (TEL SUP CAR or TEL PLT CAR)
in case of ITU channel selection.
AA
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