Service manual

OPERATION
3-35
April 2001
Part No. 001-9800-203
High Tier Models
Test mode modulation is chosen by selecting
groups in the normal manner. The modulation type
selected by each group is shown in Table 3-3.
3.11.7 MISCELLANEOUS
When in test mode, normal operation is half-
duplex with the Rx audio controlled by the carrier
squelch circuit. The only exception to this is on
Groups 4, 5, 6, and 7 when the Rx audio is controlled
by the reception of the proper Call Guard signal.
To transmit in test mode, the PTT switch is
pressed. The receiver is disabled when in the transmit
mode. The volume is adjustable in the normal manner
by pressing the VOLUME buttons or rotating the
volume knob. The squelch can also be adjusted in the
normal manner as described in Section 3.4.6 (press
AUX1 with low tier models).
Low Tier Models
The other two option switches on the front panel
perform the following functions in the test mode:
SCAN (High/Low Power) - Toggles between high
and low transmitter power. Low power = green Scan
LED is lighted.
A/D (Modulation Select) - Enables the modulation
select mode as described in Section 3.11.6.
AUX1 (Squelch Adjust) - Selects the squelch adjust
mode. When this mode is selected, the AUX1 decimal
point is lighted.
NOTE: With low tier models, when the preceding
squelch adjust mode is selected, the modulation set
mode (indicated by “+”) is disabled.
AUX2 (Bandwidth) - Toggles the radio channel band-
width setting between 12.5 and 25 kHz channels.
When the 12.5 kHz mode is selected, the AUX2
decimal point is lighted.
Talk-Around Select - The talk-around mode is
toggled in the modulation select mode when the
display “rolls over” from group “9” to “1” or vice
around mode is indicated by the “–” indicator (scan
list status).
High Tier Models
The option buttons on the front panel perform the
following operations in the test mode. The high tier
option switch reference number is shown in brackets
([ ]). Refer to Section 3.11.1 for more information.
FCN [1] (Squelch Set/Version No.) - Pressing FCN
once displays “FCN” on the lower line of the display.
Then rotating the Select switch within 8 seconds sets
the squelch level in the normal manner (see Section
3.4.6). Pressing FCN twice displays the software
version number.
Table 3-3 Test Mode Modulation Schemes
Group Modulation Scheme
1
No subaudible signaling, microphone audio is
enabled in transmit mode, carrier squelch is
enabled in receive mode.
2
134 Hz square wave signal transmitted with the
transmit data filter enabled, microphone audio
muted (data deviation test mode).
3
200 Hz square wave is transmitted with the trans-
mit data filter bypassed, microphone audio muted
(modulation balance test mode).
4
67 Hz tone Call Guard signal transmitted, micro-
phone audio is enabled, 67 Hz tone is also
decoded in receive mode (tone Call Guard
squelch test mode).
5
210.7 Hz tone Call Guard signal transmitted,
microphone audio is enabled, 210.7 Hz tone is
also decoded in receive mode (tone Call Guard
squelch test mode).
6
Digital Call Guard code 532 is transmitted,
microphone audio enabled, code 532 is also
decoded in receive mode (digital Call Guard
squelch test mode).
7
A valid LTR word is transmitted and received to
allow LTR word testing in an LTR test system
(LTR test mode)
8
Enable compandor using I/O line and active state
programmed for companding as described in
Section 4.9. Modulation same as Group 1.
9
Enable encryption using I/O line and active state
programmed for encryption as described in
Section 4.9. Modulation same as Group 1.