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NX-300
104
ADJUSTMENT
Receiver Section
Item
Condition
Measurement
Adjustment
Specifi cations /
Remarks
Panel tuning mode
PC test mode
Test-
equipment
Unit
Terminal
Unit
Parts
Method
1. AF level
setting
[Panel test mode]
1) CH-Sig: 1-1
SSG
output:
–47dBm
(1mV)
(MOD:
1kHz/±1.5kHz)
Wide/Narrow:
Nar-
row
Beat Shift: Uncheck
Compander: Uncheck
1) Test Channel
Channel: 1
Test
Signaling
Mode: Analog
Signaling: 1
Wide/Narrow:
Nar-
row
Beat Shift: Uncheck
Compander: Uncheck
SSG
output:
–47dBm
(1mV)
(MOD: 1kHz/±1.5kHz)
SSG
DVM
AF VTVM
Dummy
load
Panel
ANT
Universal
connector
Panel
Volume
knob
Turn the Volume
knob to obtain
0.63V AF output.
0.63V±0.1V
2. Sensitivity 1
adjust
1) Adj item: [SENS1]
Adjust:
[
✳✳✳
]
2) Adj item:
[L
SENS1]
→
[L’
SENS1]
→
[C SENS1]
→
[H’
SENS1]
Adjust:
[
✳✳✳
]
Press
[ ] key to
store the adjust-
ment value.
1) Adj item:
[Sensitivity 1]
2) Adj item: [Low],
[Low’],
[Center],
[High’]
Press [Apply All]
button to store the
adjustment value.
SSG
AF VTVM
Oscilloscope
Panel
ANT
Universal
connector
Panel
[Panel
tuning
mode]
[
],
[
]
[PC test
mode]
[ ],[ ]
Write the value as
followings
[L SENS1] / [Low]
: 100
[L’ SENS1] / [Low’]
: 115
[C SENS1] / [Center]
: 128
[H’ SENS1] / [High’]
: 142
3) Adj item: [H SENS1]
Adjust:
[
✳✳✳
]
3) Adj item: [High]
Increase the adjust-
ment value from 1
to get 12dB SINAD.
Note:
If the SINAD value
is less than 12dB
SINAD, conduct the
following.
At fi rst, apply “104”
as the temporary
value for “Sensitiv-
ity 1 [High]”.
Next, decrease
“Sensitivity 2
[High]” from “256”
until the SINAD
value becomes
13dB SINAD, then
apply the adjust-
ment value.
(Keep this “Sensi-
tivity 2 [High]” ad-
justment value and
no need to restore
the adjustment
value to “256”.)
Finally, increase
“Sensitivity 1
[High]” adjustment
value from 1 to get
12dB SINAD.
Caution:
Perform the step 3 adjustments of “3. Sensi-
tivity 2 adjust” before performing the
[H SENS1] adjustment.
SSG
output:
–118dBm
(0.28µV)
(MOD:
1kHz/±1.5kHz)
Press
[ ] key to
store the adjust-
ment value.
SSG
output:
–118dBm
(0.28µV)
(MOD:
1kHz/±1.5kHz)
Press [Apply All]
button to store the
adjustment value.