User's Manual

MAINTENANCE AND ADJUSTMENTS
3-3
Part No. 001-4090-101/102
1
(Unless you set a lower value). Note that readings less than 1 watt may be due to losses in the cables used for testing. Check
also your wattmeter frequency calibration curve.
2
In the RSS' Analog connector window, check the RX-TP box. (Accessed by clicking Settings and then Analog Connector).
3
If a psophometrically weighted filter is available on the service monitor, use 0.35 µV.
Table 3-7 Tests and Adjustments
Step Action Expected Results Measure With If Not?
1 Output Power
1W
1
+ 5%, -20%
Service
monitor set to
read power
Adjust using the RSS Power Out setting
(255 is the maximum) or refer to Factory
Tech support
2 Frequency Error
Press TX Unmod Within + 300 Hz
Service
monitor set to
read
frequency
Adjust using the RSS Freq Warp setting.
(Typical adjustment range is 1.5kHz) If
found outside limits, call factory technical
support.
3 Deviation
Press TX tone
For any bit rate speeds
selected
Tol. +5%, -10%
For Full channel:
+8.0 kHz
Service moni-
tor set to read
deviation with
mid(15-30 kHz)
IF filter
Adjust using the RSS Deviation
setting (if required)
4 Carrier Sense
Inject a non-modulated
carrier at -120 dBm to the
Integra-H RF input;
Raise the service monitor RF
output until the CS LED
comes on
The CS LED should be off
The CS LED should come on within 2
dB from the value set by the INTRSS:
Default: approx. -105 dBm
(-110 in non-refarmed mode)
The threshold may be raised to prevent false
CS operation in the presence of noise,
intermodulation, or other sources of radio
interference (e.g., for ambient noise at -100
dBm (measured with a spectrum analyzer),
set the CS threshold for -95 dBm)
5 Set the service monitor to generate a -80 dBm signal on the selected receive frequency. The signal
should be modulated with a 1.0 kHz tone at deviation specified below.
Set service monitor IF filter to mid (15-30 kHz), no audio filter.
Note: Use test audio (pin 4) of the power/analog connector (white lead) for SINAD and distortion
2
6 Demodulated Audio
Press CHK
For any bit rate speeds
selected, set deviation to
+8 kHz
2 Vpp + 0.2
If read on Bar graph in Radio Set-
tings
window
or
1 Vpp + 0.1
If read at Test audio pin 4 of PWR
analog connector
Adjust using RXA adjust setting (if required)
7 12 dB SINAD
Set service monitor IF filter to
mid (15-30 kHz)
set deviation to +8 kHz
< 0.5 µV
3
Service monitor
set for SINAD Refer to Factory Technical Support
8 Distortion
Set service monitor IF filter to
mid (15-30 kHz) Deviation
level as per SINAD above
< 3%
Service monitor
set for
DISTORTION
Refer to Factory Technical Support