Rohde & Schwarz SME02 - Option SM-B6 - Multifunction Generator; Option SME-B11 - DM-Coder

Fitting the Options SME
1038.6002.02 1.9 E-13
1.3.8 Option SM-B6 - Multifunction Generator
The multifunction generator is fitted at one of rear slots A5, A6 or A12.
À Undo the board locking on both sides of the motherboard.
À Plug the PCB on one of the slots.
À Lock modules again
À Remove jumper X29 at the front top of the motherboard
À Cable 50-MHz reference, cf. Section 1.3.13
1.3.9 Option SME-B11 - DM-Coder
The data coder is fitted into module A8, digital synthesis.
À Open module A8.
À Fasten the DM coder board by means of 4 screws.
Caution: The four insulating washers supplied have to be placed
between the spacers on module A8 and PCB of the
option.
À Plug in connector W1, W2 and W3.
À Screw on cover again.
After fitting the module, the amplitude content and the delay for the DQPSK modulation must be
calibrated following the calibrations mentioned in Section 1.3.
Amplitude content
À Allow the SME to warm up.
À Set 836 MHz in the FREQUENCY menu.
À Select PRBS in the DIGITAL MOD / DQPSK / SOURCE menu.
À Select TRIM ON in menu UTILITIES / CALIB / DQPSK
AMPLITUDE.
À Select the following in menu UTILITIES / DIAG / TPOINT
- TEST POINT 704
- STATE ON
The diagnostic point of the ALC control voltage can be switched on.
À Adjust the voltage at this test point to 0 ±4 mV using potentiometer
R297 on module A7, digital synthesis. Adjustment element R297
(LEVEL) can be accessed from the bottom of the instrument without
dismantling the module.