1. Frequency Selector
2. MHz Indicator
3. SQL Control
4. RF TEST Indicator
5. Mode Selector
Figure 3A-6. HF Control Panel
(c) LSB. Places set in Lower Sideband
Places set in Amplitude
(e) CW. Not used in this installation.
(f) SVU. Not used in this installation.
(g) SVL. Not used in this installation.
(h) RF TEST. Places set in test mode.
Operation of the system is limited to
3 minute (unkeyed) for SSB voice; 1 minute
transmission (keyed) with a 7 minute
(unkeyed) for AM, voice modulation up to
55 °F (131 °F) ambient temperature.
No warmup is required before operation.
The system may be operated in the receive
1. Mode selector As required.
2. Frequency selector Select.
3. Squelch control Set, turn completely
4. Tune the system by momentarily
pressing the microphone switch. A
constant tone will be heard while the
system is tuning, average tuning time
is 3 to 5 seconds. After tuning, the
tone stops and receiver noise will be
If a fault occurs during the tuning process,
an interrupted tone (beeping) will be heard
in the headset. To clear a fault, change any
frequency selector knob at least one step
and then return to the desired setting.
Another tune cycle may now be attempted
by pressing the microphone switch.