Rohde & Schwarz SME02 - Page 170

Digital Modulation SME
1038.6002.02 2.124 E-13
FRAME CONTENTS
This function specifies the contents of the max. 128 frames sent
by the SME during one cycle. A window is opened in which each
frame is represented by one character. One of the following frame
types can be selected for each of the 128 frames:
Character Status
display
Frame contents
I
IDLE ReFLEX25 frame without addresses and message
contents
A
ALPH ReFLEX25 frame with alphanumeric message and
address
N
NUM ReFLEX25 frame with numeric message and
address
T
TONE ReFLEX25 frame with tone-only message and
address
S
SCI SCI frame
R
RSYN Emergency resynchronization frame
B
BER ReFLEX25 frame with a message that switches the
receiver to the bit-error-test mode
F
FPAT ReFLEX25 test filler pattern according to section
10.1 of the ReFLEX25 standard
O
OTH Simulated data of another radiocommunication
service; contains no ReFLEX structures at all
1...9
CUS1 to 9 Custom frames, freely definable by the user (see
operating instructions at the end of this section)
Notes:
- A cycle can also be reduced to less than 128 frames. Each
time the -/<- key is pressed, a frame character is deleted and
the cycle thus reduced by one frame. Hatched areas are
displayed. In this case, the SME starts the next cycle earlier.
- FRAME CONTENTS can also be varied while ReFLEX25 is
active.
- For using the frame types BER and FPAT see also section „Bit
Error Rate Test“
- In the modes MODE SINGLE and MODE EXT-SINGLE all
ALPH, NUM und TONE frames are replaced by IDLE frames
as long as no trigger event has arrived or EXECUTE SINGLE
has not been triggered.
IEC-bus command: IEC-bus command:
SOUR:REFL25:FCON “SAAAAAAAAAAAAAA..
.“ (abbreviated)
AUTO ADAPTATION
If AUTO ADAPTATION is set to ON, the following settings are
performed automatically as soon as ReFLEX25 is switched on or
RECALCULATEis triggered. In detail, the following settings are
performed:
FORWARD CHANNEL BASE FREQUENCY, ASSIGNMENT
NUMBER and FREQUENCY SPACING are used to calculate and
set the RF.
The automatically set values can be varied subsequently without
recalculation of the telegram. These modifications take effect
immediately. However, they do
not react on the output
parameters.
IEC-bus command: SOUR:REFL25:AAD ON