OPTION 005 GMSK Bt 0.3
Annex A-5
EXTERNAL MODULATION
Clock and data input at TTL compatible levels. Data must be valid on the falling edge of
the clock input.
Data input level: TTL compatible.
Clock input level: TTL compatible.
Clock input frequency: 270.833 kHz ±25 parts/10
6
or a clock of the same
it rate but including one clock period of 1 1/4 bits
per slot.
Envelope input impedance: 15 kΩ nominal.
Doppler FM input impedance: 50 Ω.
ENVELOPE CONTROL
Controlled by selecTable constant internal level, or from the external ENVELOPE input.
External envelope levels are 0 V for off, +1 V for specified RF level. The RF output voltage
varies linearly with applied voltage.
Input rise time: Less than 4 μs.
Off slot suppression: Better than −70 dBc at 0 V.
MODULATION SENSE
Output frequency can be set to upper or lower sideband. Modulation sense can be
inverted.
SYNCHRONIZATION
Instruments may be synchronized by use of the SYNC input/output. One instrument in
Master mode sources a bit clock and the SYNC signal. The SYNC signal goes active low for one
bit during the transition of the internal data from slot 7, bit 156 to slot 0, bit 0. Instruments in
Slave mode use Clock and Sync signals to remain in synchronism.
Synchronization input/output: Open collector TTL 2 mA pull-up, active low,
bidirectional.
DIMENSIONS AND WEIGHT
Height Width Depth Weight
152 mm 425 mm 525 mm 19.0 kg
6 in 16.6 in 20.5 in 42 lb
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