or O-5A/FR can
with Converter CV-2/TX or CV-2A/TX after minor
changes have been made in the circuit. Complete infor-
Converter CV-2C/TX and Exciter Unit O-5B/FR
mation on Exciter Units O-5/FR and O-5A/FR is con-
are used in frequency-shift transmission and recep-
tained in TM 11-2205.
a. Transmitting. When transmitting, the 1,800-
RF Oscillator O-86/FRT is similar to Exciter
TT-1(*)/TXC-1 are fed into Converter CV-2C/
Unit O-5/FR or O-5A/FR that already has been
TX, where they are rectified. The output from
modified for use with Converter CV-2/TX or
the converter is in the form of a varying dc
CV-2A/TX. It can be used in place of Exciter
signal that represents the envelope of the modu-
Unit O-5/FR or O-5A/FR without modification.
lated, 1,800-cycle carrier. This varying dc signal
Refer to TM 11-2205 for complete information on
is applied to the oscillator control tube in Exciter
Figure 28. Frequency-shift transmission and reception
of facsimile signals, block diagram.