Digital Modulation SME
1038.6002.02 2.128 E-13
MODULATION
Selection of used modulation. Two types are available:
FSK The RF is directly modulated with the data signal.
FFSK An LF is first modulated, which is then used as the
modulation signal for the RF.
IEC-bus command SOUR:POCS:MOD FSK
DEVIATION
Input value of frequency deviation of modulation.
For FSK 4.0 kHz and 4.5 kHz are possible, for FFSK 1.5 kHz, 2.0
kHz, 3.0 kHz, 3.5 kHz, 4.0 kHz and 4.5 kHz. The instrument stores
two independent deviation values (one for each type of modulation).
The value which is displayed and used depends on the modulation
setting.
IEC-bus command SOUR:POCS:DEV 4.5kHz
MOD POLARITY
Selection of the polarity of the modulation.
NORM Polarity of modulation according to standard POCSAG.
INV Polarity of modulation inverted.
IEC-bus command SOUR:POCS:POL NORM
LEVEL ATTENUATION
Input value for the level attenuation. According to FTZ 171TR1
section 4.5.4.2, the levels of the batches no. 2 up to no. 5 are
reduced by the value set here.
Notes: – This setting has an impact only, when a message or filler
batches are transmitted in any of the batches 2 to 5. The
unmodulated carrier emitted between the end of the
message and the beginning of the next call is not
attenuated. Usually, the message is transmitted in the first
batch. By setting FILL-BATCHES BEFORE MESSAGE,
however, the filler batches can be inserted prior to the
actual message.
– Entry of a value in this menu changes the LEVEL
ATTENUATION-value of the other DM-modulations, too.
IEC-bus command SOUR:DM:DATA:ALEV 0dB
BITRATE
Selection of bitrate, at which the data should be outputted. Possible
values are:
512, 1200 and 2400 baud.
IEC-bus command SOUR:POCS:BRAT 512bps
--- MESSAGE ---
The parameters of this section are used for setting the destination
address as well as the useful data of the message.
ADDRESS
Input value of the address of the pager to be called. The specified
range is 0 to 2097151.
IEC-bus command SOUR:POCS:MESS:ADDR 1
CATEGORY
Selection of the category of the transmitted message.
NUMERIC numeric message,
TONE tone-only message
ALPHANUMERIC alphanumeric message
IEC-bus command SOUR:POCS:MESS:CAT TONE
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