TM 11-6625-3041-30/T0 33A1-8-908-12
1-12. TRANSMIT 1 AND 2 (A3 & A4) RATE SELECT
DATA RATE
All circuits
Control
associated with
the 21 different
data rates are
controlled by two
decoders whose
inputs are set
by the front
panel DATA RATE
control .
Decode I, II Decode I is
located on the
Transmit 1 card
and Decode II is
located on the
Transmit 2 card.
Both are program-
mable read-only
memories (PROMS).
The input to each
decoder is identical
and consists of a
5-bit binary code
derived from the
DATA RATE control.
The outputs are a set of six or seven binarv levels (two
outputs from DECODE I and one from DECODE II are not used)
that vary with the DATA RATE setting depending on how the
PROMS were programmed.