Download - TX1 Calibration Steps

Radio TX CalibrationTraining & Consultancy Unit

Tariq Ismail

JUNE 25, 2010

This document explains the steps required to perform TX calibration of radios in HMAC1 (CTU1) and HMAC2 (CTU2) BTS. At the end , cable configurations of EQCP, RSSI and MMI is given for reference.

2 Radio TX Calibration

TX Calibration StepsCTU 1 & CTU 2


Required Tools/Equipment:

1. Digital Power meter2. Power meter Sensor with Jumper cable and connectors3. Laptop with Procom Plus and TX scripts (CTU1 & CTU2)4. MMI Cable for Procom terminal5. EQCP Cable for DRI access6. RSSI Cable for CTU1 clock reset

Power Meter Sensor 5000 EX Digital Power Meter (Bird)

From Radio to Antenna


Some important and basic steps are common and are to be followed in any calibration (TX & RX)

CTU1 TX Calibration Steps

Login to site through MCUF Check site id by “ disp_site ” command State Radios by “ State <id> dri * * ” Check alarms at site “ disp_act <id> ” Check equipage and antenna select of radios by “ disp_eq <id> dri x y ”

Move to level 3 by using “chg_l " command Login to BSC as follows

a) Press Ctrl + n b) Write the command “ Rlogin 1 0114h “ (0114h to 0119h)c) Again press Ctrl + n , now you are in BSC, it can be verified by disp_site, BSC ID is 0

Change to level 3 Write the command “ Store <site id> “ to enable calibration data Now write “disp_cal_data <id> dri x y “to check for “Store Calibration Data: enabled”

Density of DRI

Cabinet Master/Slave

DRI Port Number

ANT Select


Login back to site by Ctrl + d Lock the sector by the command “Lock <Site Id> dri x y, repeat the same for all DRIs of the

particular sector. While locking a radio, it must be noted to lock the DRI with RTF 0 at the last. RTF 0 of each sector contains BCCH. Below snap shows these RTFs in each sector and DRIs associated with it. This can be seen by stating the DRIs with command “state <site Id> dri * *”

RTF0 Sector A

RTF0 Sector B

RTF0 Sector C


Before connecting Power meter, check VSWR by connecting site master to each of the DRIs. If there are reflections in cable, then any kind of calibration is not effective. Removing reflection before a DRI calibration is a must.

Now removed RF cable from dup and connect Power meter sensor in between. Position of sensor should be such that the arrow should direct towards the antenna. Connect the jumper cable with power meter and turn it on

If power meter is showing values in dbm, convert them to Watt from the front display Remove MMI cable and login to DRI using RSSI cable MMI ROM> tcu_clock 0 (reset clock to zero) Now login to DRI using EQCP cable Run the script Alarm_Off_TX, Alternate of script is to type the following commands

EQCP> .gsmfwEQCP> testEQCP Test> bbh alarm off EQCP Test> act cEQCP Test> cspwr

Adjust the power by giving offsets through ‘U’ and ‘D’ keys. For GSM 900, power should be 20 Watts (>=20 W & <21 W). For DCS 1800, power should be 16 Watts (>=16 W & <17 W). To increase power use key ‘U’ and to decrease power use the Key ‘D’

After powers are adjusted, press ESC to quit Now run the script “SAVE_CAL_TX” to save the calibration, Alternate of the script is to type the

following commands EQCP Test> halt c EQCP Test> wrenb EQCP Test> save cal TX EQCP Test> wrptc

Calibration of one radio (CTU1) is complete. Repeat the same process for all radios to be calibrated. After completing the last DRI, remove power meter from that DRI and connect back RF cable (All radios that are calibrated are still locked)

Now login to BSC Change level by “chg_l” Clear calibration data of all DRIs that are calibrated by the command

Clear_cal_data <site Id> dri x y Give hard reset to the radios (Must in CTU1) In service all radios by command

Ins <Site ID> dri x y TX Calibration is complete, Note that offsets increasing 6 indicates that the particular CTU1 is

faulty and may alter power again shortly. Check through “disp_cal_data <id> dri x y “command that offsets have changed, if offset value is changed, then TX calibration of that DRI is successful.


CTU2 TX Calibration StepsUnlike CTU1 which is calibrated in locked state, CTU2 is calibrated only when it is in service. As there are two radios in a CTU2, we have to in service only one, which we will calibrate, and leave its associated dri locked. In the end when the CTU2 will be in serviced after clearing data from BSC, the associated DRI will automatically take the same calibration of the radio that we calibrated, so no need to repeat the same process for the 2nd radio in the CTU2, just keep it locked and calibrate the in-serve radio only.

Login to site through H2SC Check site id by “ disp_site ” command State Radios by “ State <id> dri * * ” Check alarms at site “ disp_act <id> ” Check equipage and antenna select of radios by “ disp_eq <id> dri x y ”

Move to level 3 by using “chg_l " command Login to BSC as follows

a) Press Ctrl + n b) Write the command “ Rlogin 1 0114h “ (0114h to 0119h)c) Again press Ctrl + n , now you are in BSC, it can be verified by disp_site, BSC ID is 0

Change to level 3 Write the command “ Store <site id> “ to enable calibration data Now write “disp_cal_data <id> dri x y “to check for “Store Calibration Data: enabled”

Density of DRI

Cabinet Master/Slave

DRI Port Number

ANT Select


Login back to site by Ctrl + d Lock the sector by the command “Lock <Site Id> dri x y, repeat the same for all DRIs of the

particular sector. While locking a radio, it must be noted to lock the DRI with RTF 0 at the last. RTF 0 of each sector contains BCCH. Below snap shows these RTFs in each sector and DRIs associated with it. This can be seen by stating the DRIs with command “state <site Id> dri * *”

Before connecting Power meter, check VSWR by connecting site master to each of the DRIs. If there are reflections in cable, then any kind of calibration is not effective.

RTF0 Sector A

RTF0 Sector B

RTF0 Sector C


Removing reflection before a DRI calibration is a must. Connect power meter sensor to the dup of DRI to be calibrated, connect the jumper cable to

digital power meter and turn it on. Now that the power meter is connected to the DUP, in service one radio and keep its associated

radio locked, normally , in a CTU2 with two radios, the 1st one is in-serviced and the 2nd one is left locked (0 0 in-serviced and 0 1 locked)

Remove MMI cable from H2SC controller card and login to DRI using EQCP cable (no need to reset clock to 0 in case of CTU2). After logging in to the CTU2, run script TX_double or TX_single accordingly, depending weather the CTU2 is double density or single density

Adjust the power by giving offsets through ‘U’ and ‘D’ keys. For GSM 900, power should be 20 Watts (>=20 W & <21 W). For DCS 1800, power should be 16 Watts (>=16 W & <17 W). To increase power use key ‘U’ and to decrease power use the Key ‘D’

Press ‘Q’ to quit after power finally adjusted as above Store the calibration by command “cal_store 1”, it will show PASS after executing this command Login back to H2SC and get the calibrated DRI locked Remove Power meter and connect back the RF cable Login to BSC Clear previous calibration data by command “clear_cal_data <Site ID> dri x y

We actually clear the previous calibration data from BSC, as it a parent site, and if previous calibration is not cleared, it will by default copy the previous calibration data to the DRI as soon as it is in-serviced

Check that the calibration data is cleared by “disp_cal_data <Site ID> dri x yIt should show no calibration data

Now finally, in-service the radios

Associated radio

DRI density


Cable Configurations

MMI Cable Configuration

Connector Type

Pin Connections

DB-9(F) 1 2 3 4 5 6 7 8 9DB-9(M) NC 3 2 NC 5&7 NC NC NC NC

EQCP Cable Configuration

Connector Type

Pin Connections

DB-9(F) 1 2 3 4 5 6 7 8 9DB-9(M) NC 3 2 NC 5 NC NC NC NC

RSSI Cable Configuration

Connector Type

Pin Connections

DB-9(F) 1 2 3 4 5 6 7 8 9DB-9(M) NC 9 8 NC 5 NC NC NC NC