Dataradio Gemini PD Manuel d'entretien - Page 9

Parcourez en ligne ou téléchargez le pdf Manuel d'entretien pour {nom_de_la_catégorie} Dataradio Gemini PD. Dataradio Gemini PD 14 pages. Mobile radio modem

Imprimer la page
Table 1: Tests and Adjustments Full & Half ChannelUnits
STEP
ACTION
1
Output Power
Press PTT Channel x
2
Frequency Error
Press PTT Channel x
3
Deviation
Press PTT Channel x
Carrier will be modulated
with a 1 KHz tone.
4
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. Open the top cover to access the radio (see 3.4.4)
To be performed only if a loss in system performance has been detected
5
12 dB SINAD
• For Full channel unit, set
deviation to ±3 kHz.
• For Half channel unit, set
deviation to ±1.5 KHz
• Set service monitor IF
filter to mid (15-30 kHz),
no audio filter.
6
Distortion
Use same settings as per 12
dB SINAD
1 (unless you have set a lower value). Note that readings less than 40 watts may be due to losses in cables used for testing.
Check also your wattmeter frequency calibration curve. Do not be too ready to condemn the transmitter.
2 If a psophometrically weighted filter is available on the service monitor, use 0.35 µV.
120 20110-003 PRELIMINARY
EXPECTED
MEASURE
RESULTS at
25° ° ° ° C
1
40 watts
Service monitor
set to read power
+10%, -20%
±300 Hz
Service monitor
set to read fre-
quency error
For any bit rate
Service monitor
speeds selected:
set to read
deviation
Full channel unit
±4.0 kHz
+5%, -10%
Half channel unit
±2.5 kHz
+5%, -10%
Measure taken at
Service monitor
J400 pin 21 (RX1)
set for SINAD.
and at pin 23
Connect to radio
(RX2)
connector J400
pin 21 (RX1) or
≤ 0.5 µV
2
pin 23 (RX2).
Same as per
Step 5
< 3%
5
WITH
Check the RSS maximum power
output setting: must be set to 255
(means 40W). User can however
reduced it down to 10 Watts.
Refer to factory tech support.
Adjust using the RSS Freq Warp
setting (fine tuning adjust)
(Typical adjust range is ±1.5KHz)
If found outside limits, user is
to call factory technical sup-
port.
Using RSS, adjust TX deviation.
Refer to factory technical support.
Refer to factory technical support.
Gemini/PD Technical Manual
IF NOT?