Part 4: Transmitter RF Levels and checks
This section shows the typical RF levels expected throughout the transmitter path
and the expected control voltages for both the UHF and IF synthesisers. A block
diagram showing the locations of the RF measurement points is shown in figure
4.1.
Part 4.1 : Transmitter Testing Set-up
To check the transmitter the following conditions have to be set:-
1. Set the d.c. power supply to 3.8volts.
2. Using the GSM/PCN test jig power up the hhp and via the keypad enter the
following menu options to put the hhp into receive mode:-
•
Press “B”- (TX Options).
Once this key is pressed the hhp should display:-
“Suspend Mode
Function Id”
This message indicates that the hhp has entered engineering test mode.
•
Press “A or B”
according to which tx frequency band is required.
Option A = GSM900
(ARFCN:62, Transmit burst type:Normal, Modulation:
Ones and Power Level: 5)
Option B = GSM1800
(ARFCN:699, Transmit burst type: Normal, Modulation:
Ones and Power Level: 0 )
The HHP is now set to Normal transmit burst on channel 62 or 699 on power
level 5 or 0 respectively.
•
The Transmitter parameters can be altered by another sub menu, these
being:-
A. Change Channel
B. Change power level
C. Set modulation type ( 0’s, 1’s or random)
Содержание DB2000
Страница 1: ...DB2000 Service Manual Help ...
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Страница 4: ...Important One incorrect adjustment may result in the need for many more and result in extra 0 1 2 2 ...
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Страница 83: ...Fit Antenna INSERT AND SCREW THE ANTENNA INTO THE ASSEMBLY ...
Страница 106: ...Part 5 Test Signals Fig 3 4 V_G_LNA Pg 3 5I TP300 Fig 3 5 V_P_LNA Pg 3 5J TP301 Fig 3 6 RX_ON2 Pg 3 16G TP405 ...
Страница 107: ...Fig 3 7 GSM_LNA Pg 3 3I TP419 Fig 3 8 PCN_LNA Pg 3 3J TP420 Fig 4 9 TCXO Pg 2 H11 TP413 ...
Страница 108: ...Fig 4 0 GSM Rx I Q s Pg 3 E F15TP406 7 Fig 4 1 PCN Rx I Q Pg 3 E F15 TP406 7 Fig 4 2 GSM_TX Pg 1 1I TP403 ...
Страница 109: ...Fig 4 3 PCN_TX Pg 1 1J TP417 Fig 4 4 3V_G_TX Pg 1 4I TP100 Fig 4 5 3V_P_TX Pg 1 4J TP101 ...
Страница 110: ...Fig 4 6 GSM_ON Pg 1 2K TP402 Fig 4 7 PCN_ON Pg 1 1K TP415 Fig 4 8 PRE_ON Pg 1 4J TP416 ...
Страница 112: ... I Q ...
Страница 113: ...Fig 4 14 V_ERROR PCN Pwr Lvl 7Pg 1 16I Fig 4 15 300khz Charge Pump Pg 1 Log 9G ...
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Страница 144: ...M5 TV0501 2SC4180 T1 NPN TRANSISTOR TR200 TR204 Emitter Base Collector Surface Mount NPN Epitaxial Planar Transistor ...
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