Repeat Sensitivity; Tx Power Down Detect - Vertex Standard VXR-9000 Service Manual

Alignment

Repeat Sensitivity

Setup the test equipment as shown below.
Sampling
Coupler
50-ohm
Dummy Load
TX ANT
Deviation
Meter
Open the "Alignment" window, then click the left
mouse button on the "Repeat" tab to move to the "Re-
peat" screen.
Set the RF Signal Generator output to the "Repeat RX
Frequency," at a level of +40 dBµV, ±3.0 kHz deviation
with a 1 kHz audio tone.
Click the left mouse button on the "Repeat Sensitiv-
ity" box.
Click the left mouse button on the "Repeat Sens. Enb"
button to actitvate the transmitter (the "Repeat Sens.
Enb" label is changed to "Repeat TX Off").

TX Power Down Detect

Setup the test equipment as shown below.
50-ohm
Dummy Load
Open the "Alignment" window, then click the left
mouse button on the "TX PD Det." tab to move to the
"TX PD Det." screen.
Click the left mouse button on the "Adjust" box on the
"Low Band Edge Frequency" area of the "Tx Power
Low Temporary ADJ" field (highlighted in "pink").
Click the left mouse button on the "TX PD Det. Enb"
button to actitvate the transmitter (the "TX PD Det.
Enb" label is changed to "PTT Off").
Press the [ Page Up ] / [ Page Down ] key so that the
Power Meter reading is 5 W.
Click the left mouse button on the "READ" button to
save the "TX Power Down Detect" data.
G-6
Computer
VXR-9000
( CE60 )
MIC
RX ANT
RF Signal
Generator
Inline
VXR-9000
Wattmeter
TX ANT
Computer
( CE60 )
Press the [ Page Up ] / [ Page Down ] key so that the De-
viation Meter reading is 3.0 kHz ±0.2 kHz.
Click the left mouse button on the "Repeat TX Off"
button to disable the transmitter (the "Repeat TX Off"
label is returned to "Repeat Sens. Enb").
Click the left mouse button on the "PTT Off" button
to disable the transmitter (the "PTT Off" label is re-
turned to "TX PD Det. Enb").
Repeat the above steps at the four points (box: frequen-
MIC
cies).