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Preliminary TR-45L Operating Instructions
Cautions
08/20/2022
1)
Do not apply more than 14.5 volts DC to the TR-45L.
2)
Never connect a power source other than an approved charger to the RED power
jack on the back of the unit. This is for the charger only (5.5x2.1mm)! The unit will
not operate from the optional internal battery while the charger is connected.
3)
External battery power may be applied to the BLACK connector (5.5x2.5mm). The
unit will operate with power applied to the black connector even when the charger
is connected.
Switch and control overview
The main power switch (red boot) is on the lower right side of the panel.
The volume control is below the power switch.
The notch filter is to the left of the volume control. The frequency of the notch can be varied
from about 200 Hz at fully counter-clockwise (Min) to more than 3 kHz fully clockwise (Out).
The notch filter is essentially out of the circuit when set fully clockwise because the notch
frequency will be well beyond the highest audio frequency available from the receiver.
RF gain control is to the left of the Notch filter control, followed by the keyer speed control.
