2. SSB RADIOTELEPHONE
2-4
2. Rotate the ENTER knob to select the option desired then push the knob.
Note: The temperature of the power amplifier is monitored. When its temperature ris-
es above a certain temperature, output power is automatically reduced.
2.3.3 Condition of the transmitter
While transmitting, you can display [IA] (antenna current), [IC] (collector current), [VC]
(collector voltage), [RF] (RF output) or [VS] (source voltage) on the RT screen.
1. Rotate the ENTER knob to select [IA], [IC], [VC], [RF] or [VS] (whichever is dis-
played) then push the knob.
2. Rotate the ENTER knob to select the option desired then push the knob.
Check the transmission power
During transmission, the IA bar deflects according to the current being fed from the
antenna coupler to the antenna feeder. The unit of readout is amperes. The antenna
current varies with the effective antenna impedance. The reading differs by the fre-
quency and antenna length. The output power is proportional to the square of an an-
tenna current.
FS-1575/2575 FS-5075
[HIGH] No reducing
[MID] 125 Wpep 350 Wpep
[LOW] 90 Wpep -
[LOW1] - 200 Wpep
[LOW2] - 110 Wpep
Antenna
current
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