General Dynamics R2600 Series, Operator'S Manual, Page: 246 / 402

14-7 MEASURING RECEIVED AUDIO WITH
CLEAR SCOPE
This section of the manual contains information on
using the Clear Scope function to monitor an audio
signal that has been transmitted by SECURENET
radio and then recovered by the analyzer.
Connect the analyzer's RF I/O port to the RF output
of the transmitter under test.
1. Place the analyzer in Securenet mode. Place
the cursor within the RF Zone in "RF
Control:" field. Press the MON softkey to
place the analyzer into its Monitor mode of
operation.
MON GEN DUPLEX
Monitor Mode
Softkey
2. Within the RF Zone, set as follows:
3. Set the SQUELCH control on analyzer to
threshold.
4. Press AUD hardkey.and select voice.
5. Press DISP hardkey to move the cursor to the
Display zone.
6. Place cursor in the "Display:" field and press
CLEAR SCOPE softkey. The CLEAR
SCOPE screen should appear similar to
figure 14-7. No waveform is present until the
transmitter is turned on.
7. Key up the transmitter in Secure mode.
CAUTION
The analyzer's built-in RF load dissipates up
to 50 W for three minutes and up to 125 W for
one minute. If a high-power transmitter is
keyed into the analyzer for a time long enough
to threaten overheating the power measuring
circuitry, the analyzer's audible alarm sounds
and the display changes to the
RF LOAD
OVERTEMPERATURE
warning, signaling the
operator to unkey.
8. Move the cursor to Horiz: field and select the
appropriate scale.
9. Move the cursor to Vert: field and select the
appropriate scale.
10. Move the cursor to Vert Position: field. Use
move up/move down softkeys or rotary
control to position the recovered audio
waveform on a convenient graticule.
11. Move the cursor to Horiz Position: field. Use
move left/move right softkeys or rotary
control to position the recovered audio
waveform on a convenient graticule.
12. Move the cursor to Mrk: field.
Code VOICE
Fixed 1kHz 0.000 V X

Press

V
softkey to display movable markers
that measure voltage differential (Vp-p).

Press

T
softkey to display movable markers
that measure time differential (sec).

Press

1/T
softkey to display movable
markers that measure reciprocal time
differential (in Hz).
200