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|  MIL-T-85472A(AS)
3.6.6.1 Encoder functions. The encoder drawer shall be capable of
converting the mixed data link command signal from the data link test
drawer, and various discrete control signals to a Phase II Serial output.
The mixed signal shall be applied to the encoder drawer via cable W55 (see
figure 2). The mixed signals shall then be converted into a binary code and
fed into a series of multiplexer. The output of the multiplexer shall be
converted to Phase II format. The telemetry information for the transmitter
in the data link test drawer shall be supplied via cable W56 and shall be
modulated by the Phase 11 signal from the half-sine wave modulator 1A5A6.
3.6.6.1.1 FREQUENCY switch. The FREQUENCY switch shall be a three-position
rotary switch which shall provide the capabilities for selecting a positive
or negative dc voltage to change the carrier frequency of the transmitter
via cable W57.
3.6.6.1.2 TONE - DIGITAL switches/indicators. These switches/indicators
shall be a two position push-button switch/indicator which shall provide the
capability to activate the encoder drawer in the Phase II mode of operation.
Phase II CODE switches. These switches shall be eight digit
3.6.6.1.3
thumbwheel switches which shall provide the capability to enter the code
number onto the Phase 11 signal for transmission to the weapon.
3.6.6. 1.4 DISCRETE COMMAND (S1 through S10) switches. These switches shall
be OFF/ON toggle switches which shall provide the capability to enter
commands into the Phase II signal for transmission to the weapon.
3.6.6.1.5 Phase II format conversion. Signals from the Mixer Amplifier
(1A4A2) shall be converted to Phase II format by the Encoder Assembly 1A5A1
in the Encoder Drawer Assembly. The Encoder Assembly shall decode and
convert the Mixer Amplifier signals to a bit rate word. The Phase II signal
shall then be routed to the data-link Test Drawer (1A4) to modulate the
transmitter 1A4TR1, and in turn to weapon under test. The bit rate word
format is classified. Refer to SECRET manual NAVAIR 16-350Q169-1A for the
word format.
3.6.6.1.6 TONE/DIGITAL switch (1A5S14). With (TONE/DIGITAL) switch 1A5S14
in TONE position, the output of the transmitter 1A4TR1 shall be directed to
the Phase I weapon under test. With switch 1A5S14 in the DIGITAL position,
the output of the 1A4TR1 transmitter shall be directed to the Phase II
weapon under test.
3.6.6.2 Encoder assembly (1A5A1). The encoder assembly shall consist of
six printed wiring boards 1A5A1A1 through 1A5A1A6 housed in a card cage
assembly.
3.6.6.2.1 Printed wiring boards (1A5A1A1 and 1A5A1A2). These printed
wiring boards shall decode five discrete commands (Test On, PSI Flag, Video
On, Video Off, and Command Override) from the mixer amplifier 1A4A2 in the
Data Link Test Drawer (1A4).
3.6.6.2.2 Printed wiring board (1A5A1A3). A bit rate control signal shall
be generated on printed wiring board 1A5A1A3. This bit rate signal shall be
supplied to the clock input of a seven stage ripple counter. The output of
the counter shall be gated to provide the timing control signals to the
multiplexer and counters. The ripple counter shall reset after every word.
To count the azimuth and elevation frequencies, bandpass filters shall be
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