Special Transmit Audio Levels
Assuming that the transmit audio level has been
adjusted to 0 dBm (function-tone and microphone
audio) for a particular line (with the appropriate
line output level control on the upper main PCB
and MIC SENS control R18 on the lower main
PCB, which results in +10 dBm guard-tone and
–20 dBm continuous PTT tone output), the
following levels can be changed (for test or
other applications) by moving the designated
jumpers on the lower main PCB:
Microphone Audio:
Change from 0 dBm to –6
dBm by moving P12 from B to A.
Guard Tone:
Change from +10 dBm to 0 dBm
by moving P11 from A to B.
Function Tone:
Change from 0 dBm to –10
dBm by moving P10 from A to B.
Continuous PTT (Hold) Tone:
Change from
–20 dBm to –30 dBm by moving P9 from A to B.
The above jumpers on the lower main PCB are
accessible only by first removing the upper
main PCB.
Switch PC Board Programming
TX ALL Defeat
Only one frequency-select tone burst at one time
is possible; therefore, when multifrequency
radios are used, TX ALL will not simulcast to
everyone at the same time. For this or other
reasons it may be desirable to defeat TX ALL.
This is done by moving the DEFEAT TX ALL
jumper plug P23 to “B”.
Line 1 to 10 Defeat
For unused lines and for “lockout” of transmit
on certain lines from certain parallel consoles,
any of the ten line-select switches may be
defeated. This is accomplished by moving the
appropriate jumper plug (P11 to P20)
associated with the line to be defeated from “A”
to “B”. Note that the operator of the console
“locked out” from transmitting on certain lines
may still listen to all audio on those lines by
using the unselected line switches.
Unselected Line 1 to 10 Defeat
For unused lines and for “lockout” of
unselected audio on a certain line, move the
appropriate jumper plug (P1 to P10) associated
with that line from “A” to “B”.
NOTE:
Defeat of individual line-activity-monitor
LEDs has not been provided. For a 100% lockout
of a certain line to certain consoles, simply delete
the line connection to those particular consoles and
treat as an unused line.
Theory of Operation, Control Panel
Referring to the control-panel PCB schematic,
operation of the line-1 switch S1 applies a high
to the set input of the line-1 latch at U7-4
through the 20-ms-delay shift register U8-1,15
and RN10-2,1. Switch S1 operation also
applies an undelayed high to the reset input of
the line-1 latch at U7-3 through DN1-5,1. Since
the reset inputs of all 10 latches are connected
to a common bus, S1 operation resets any
latched circuit on the bus, including the line-1
latch U7A. However, 20 ms after S1 operation,
the line-1 latch set input goes high, and, since
set dominates when both set and reset inputs are
high, line-1 Q at U7-2 goes high, enabling
line-1 analog gates on the upper-main PCB
assembly. These analog gates connect the
line-1 driver to the TX circuits and connect the
line-1 RX circuit to the selected RX audio input
on the lower-main PCB assembly.
The nine other line-select switches S2 through
S10 operate identically to S1.
TX ALL
The TX ALL switch S11 applies a high to
U20-11 through U9-10,6, clocking U20-12
low, which causes U16-15 and the TX ALL
common to go high. This high is applied to all
line-select switch contacts through RN3 or
RN4, setting all line-select latches in the same
manner as described for single-switch
operation.
When the TX ALL switch is pressed again,
U20-12 is clocked high, U16-15 and the TX
ALL line go low, the reset line goes high
through C3 and DN3, and all line-select latches
are reset.
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Summary of Contents for VEGA C-5110B
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