1KHW001492de Tuning of ETL600 TX RF Filter E5TX

ABB Switzerland Ltd 1KHW001492-EN Archive No. Rev. Date Tuning Instructions for ETL600 Tx RF Filter E5TX - D 2007-02-14

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1KHL015570-EN - - 1KHW001492de Tuning of ETL600 Tx RF Filter E5TX.doc

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Powerline Carrier Equipment: Series ETL600

Tuning Instructions for ETL600 Tx RF Filter E5TX

Contents 1 General ..................................................................................................................................2

1.1 Designations................................................................................................................2 2 Filter programming.................................................................................................................2

2.1 Steps for determining the required jumper positions ..................................................2 3 Tuning the filter circuits individually .......................................................................................2

3.1 Use the following steps in case of the 40 W units.......................................................3 3.2 Use the following steps in case of the 80 W units.......................................................3

4 Checking the frequency response on 40 W or 80 W unit......................................................5 5 Test circuits............................................................................................................................6

5.1 Test circuit for 40 W units............................................................................................6 5.2 Test circuits for 80 W units ..........................................................................................6

Test conditions:

• Temperature range: 10 °C to 40 °C.

List of equipment:

PC with Windows 2000 or XP

HMI600 software PC P4LT cable 1:1 serial RS-232 Tx tuning adapter P3LL HENF209668 Level meter, wide band or selective, 10 kHz to 1 MHz.

SPM-33A (Acterna) or equivalent; featuring both wide band as well as selective measurements

Note: Please refer to 1KHW001490 for compatibility between software HMI600,

firmware and hardware of ETL600.

third parties without express authority is strictly forbidden. © ABB Switzerland Ltd

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1 General In the ETL600, the Tx filter E5TX is tuned using the Tx tuning adapter P3LL and the HMI600. However before starting tuning, the filter has to be programmed using the correct jumper combi-nation (given by HMI600) to get the required frequency response. The frequency response of the filter depends on whether the Tx and Rx channels are adjacent or separate and whether the equip-ment is a single channel device or provides more than one channel. The HMI600 suggests the corresponding configuration for the Tx filter according to the mentioned cases above. Refer to section 5 of the ETL600 instruction manual for more details on configuration.

1.1 Designations BTx = Tx filter bandwidth (4, 8, 16 or 32 kHz) Fo = Tx filter center frequency

2 Filter programming The filter must be programmed with jumpers. With the jumpers, the mode of the coils (series or parallel connection) and the required capacitors are selected. The required jumper settings for the Tx filter are generated in the HMI600, according to the chosen center frequency and nominal bandwidth. To set the required jumpers, the two filter prints have to be taken out of their housings. On the back side of the E5TX unit: remove the four small screws in the corners of both filter print covers. Carefully pulling at the cover, take out the filter prints.

2.1 Steps for determining the required jumper positions 1. If not already done, switch on the power of the ETL600, start up the HMI600 on the PC, log on

to the local ETL600 using equipment ID 0 and Read & write access, Upload configuration as well as Upload status enabled.

2. On the Equipment menu click Tuning & testing. A warning message box appears, informing that the normal operation of the link will be interrupted.

3. Click OK to get the Tuning & testing dialog box.

4. Click Tune Tx RF filter to get the Tuning Tx RF filter dialog box. In the frame Tx RF filter characteristics, deactivate the checkbox Auto-select standard filter if not yet done.

Note: Once the filter has been selected, in order not to loose the filter settings, the checkbox Auto-select standard filter must not be activated anymore.

5. Check if the correct filter center frequency f0 and bandwidth are shown. If these values shall be modified, select them from the drop down lists.

6. Place the jumpers according to the table Jumper settings E5TX (Transmit filter) shown in the HMI600. Cs1 settings are for the L1 filter board and Cs2 for the L2 filter board. Settings Cp and L-mode apply for both prints. “0” means no jumper, “1” means jumper placed.

Note: In the context of this instruction, a programmed jumper consists – wherever this is possible – physically of two short circuit connectors that have to be put at the same programming position, one on top of the other.

7. Click Ok to add the filter settings to the equipment configuration, to discard them click Cancel.

3 Tuning the filter circuits individually Once the Tx filter is programmed for the required frequency band, its individual circuits can be tuned with the tuning adapter P3LL and the HMI600. The DSP module P4LT/P4LU is used to

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generate and inject the tuning frequency into the transmitter filter via the output amplifier stage P1LA. The Tx tuning adapter provides facility for checking the selectivity.

Note: Keep the tuned Tx filter always together with the hybrid and combiner used during the tuning procedure. Exchanging a hybrid or combiner requires tuning the Tx filter again!

3.1 Use the following steps in case of the 40 W units

Refer to the test circuit in section 5.1.

1. The Tx tuning adapter is inserted in place of the RF hybrid (P3LE) and the RF hybrid is plugged on top of it. The Uoutput of the adapter P3LL is connected to the selective level meter in the wideband range and in high input impedance mode.

2. If not already done, switch on the power of the ETL600, start up the HMI600 on the PC, log on to the local ETL600 using equipment ID 0 and upload configuration and status of the equipment.

3. Choose the Equipment menu and click Tuning & testing.

4. A warning dialog box appears, click OK.

5. Click Tune Tx RF filter to get the Tuning Tx RF filter dialog box.

6. Check if the correct filter center frequency f0 and bandwidth are shown.

7. For tuning the coil L1 set the adapter P3LL to: • FUNCTION : A • Position of S1 : L1, FILTER • Position of S2 : TUNE • Position of S3 : OFF • Position of LOAD : LINE

Click Activate f1. Using coil L1, Uoutput is tuned to a minimum or if an end stop is reached go to Step A1.

8. For tuning the coil L2 set the adapter P3LL to: • FUNCTION : A • Position of S1 : L2, - • Position of S2 : TUNE • Position of S3 : OFF • Position of LOAD : LINE


9. Terminate the action by clicking deactivate frequency and to return to the Tuning & testing main menu click Cancel.

3.2 Use the following steps in case of the 80 W units

Refer to the test circuits in section 5.1.

1. The Tx tuning adapter is inserted in place of the RF hybrid (P3LE) in the lower rack and the RF hybrid is plugged on top of it. The Tx RF filter (E5TX) in the upper rack must be removed. The other units in both racks remain in place. The Uoutput of the adapter P3LL is connected to the selective level meter in the wideband range and in high input impedance mode.



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7. For tuning the coil L1 in the lower rack set the adapter P3LL to: • FUNCTION : A • Position of S1 : L1, FILTER • Position of S2 : TUNE • Position of S3 : OFF • Position of LOAD : LINE


8. For tuning the coil L2 in the lower rack, the combiner (P3LG) in the upper rack must be removed. Settings on the adapter P3LL: • FUNCTION : A • Position of S1 : L2- • Position of S2 : TUNE • Position of S3 : OFF • Position of LOAD : LINE


9. For tuning the coil L1 in the upper rack, the Tx RF filter (E5TX) in the lower rack must be removed. Also remove the connections from the transmit filter to connectors X171 (black) and X174 (orange) on the upper rack (backplane P1LA). Reinsert the combiner (P3LG) and the Tx RF filter (E5TX) in the upper rack. The RF hybrid remains plugged on the Tx tuning adapter P3LL in the lower rack. Settings on the adapter P3LL: • FUNCTION : A • Position of S1 : L1, FILTER • Position of S2 : TUNE • Position of S3 : OFF • Position of LOAD : LINE


10. After tuning: Reinsert the connections to the connectors X171 (black) and X174 (orange) on the upper rack (backplane P1LA).

11. For tuning the coil L2 in the upper rack, the Tx tuning adapter is inserted in place of the combiner (P3LG) in the upper rack and the combiner is plugged on top of it. The Tx RF filter (E5TX) and the RF hybrid in the lower rack must be removed. Settings on the adapter P3LL: • FUNCTION : A • Position of S1 : L2- • Position of S2 : TUNE • Position of S3 : OFF • Position of LOAD : LINE



13. Now remove the tuning adapter and reinsert all the units as before.

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Step A1 If one of the coils has reached its end stop, then one should select an alternative connection scheme for the capacitors. If the tuning coil is at its left end-stop, then the next non identical capacitor combination for a lower frequency is to be selected.

• Click on the button left end-stop reached and the new jumper settings appear. Use the same procedure in case of all other “end-stop has been reached” events.

• To undo the “end-stop reached” modifications, click on the Default button in the Coil L1 or in the Coil L2 field respectively.

• Click Ok to add the new filter settings to the equipment configuration, to discard them click Cancel in the Tuning Tx RF filter dialog box.

4 Checking the frequency response on 40 W or 80 W unit The frequency response check determines the selectivity of the filter for 75 and 125 Ohm line impedance. Use the following steps.

1. The Tx tuning adapter is inserted in place of the RF hybrid (P3LE) and the RF hybrid is plugged on top of it. The Uoutput of P3LL is connected to the selective level meter in the wideband range and in high input impedance mode.






7. The adapter P3LL is set for the following:

• FUNCTION : A • Position of S1 : L1, FILTER • Position of S2 : FILTER • Position of S3 : OFF • Position of LOAD : 75 Ohms or 125 Ohms For 45 Ohms, set both “LOAD” jumpers 75 and 125 Ohms

8. On the Tuning Tx RF filter box click Check Tx RF filter.

9. Click Activate fo, measure the Uoutput in dB and designate it as A.

10. For checking the selectivity, (BTx = 4, 8, 16 or 32 kHz)

• click Activate fo - 2·BTx and measure the Uoutput (P). The limit for Uoutput is: P < (A - x dB), value x as indicated in HMI600

• click Activate fo + 2·BTx and measure the Uoutput (P). The limit for Uoutput is: P < (A - x dB), value x as indicated in HMI600


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5 Test circuits The following circuits should be used for tuning the Tx RF filter using the tuning adapter P3LL and the HMI600. The P4LT/P4LU generates the required tuning tones.

5.1 Test circuit for 40 W units

P4LT/UOUTPUT

OUT P3LE

P1LA E5TX

P3LL

S1

L2

L1FILTER

600134A3.VSD

U

S2TUNE

FILTER

S3

ONOFF

Fig. 1: Test circuit for tuning 40 W units. Tuning coil L1 or L2 dependent on switch S1.

5.2 Test circuits for 80 W units

P4LT/U

OUTPUT

OUT P3LE

P1LA

P3LL

S1

S2TUNEFILTER

L2L1

600134A4.VSD

U

P1LA E5TX

P3LG

FILTER

OFF ON

S3

Fig. 2: Test circuit for tuning L1 in the lower power amplifier rack.

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P4LT/U

OUTPUT

OUT P3LE

P1LA

P3LL

S1

S2TUNEFILTER

L2L1

600134A5.VSD

U

P1LA E5TX

FILTER

OFF ON

S3

Fig. 3: Test circuit for tuning L2 in the lower power amplifier rack.

P4LT/U

OUTPUT

OUT P3LE

P1LA

P3LL

S1

S2TUNEFILTER

L2L1

600134A6.VSD

U

P1LA

E5TX P3LG

FILTER

OFF ON

S3

Fig. 4: Test circuit for tuning L1 in the upper power amplifier rack.

P4LT/UOUTPUT

OUT P3LG

P1LA

P3LL

S1

S2TUNEFILTER

L2L1

600134A7.VSD

U

P1LA

E5TX

FILTER

OFF ON

S3

Fig. 5: Test circuit for tuning L2 in the upper power amplifier rack.

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1KHW001492de Tuning of ETL600 TX RF Filter E5TX