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6A7 - Modern reserve transmitters are solid-state designs and transmit using only A2 modulation. When measuring transmitter center frequency, what precaution must be taken:
B.Modulation must be reduced to zero to eliminate sidebands
A.Antenna must be grounded to suppress spurious side-lobes
C.Voltage to the PA must be kept at half-value
D.Antenna current must be reduced to about 2.5 uA
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