Vaisala RVP900, Руководство пользователя

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5.2.7 Mz — Transmissions and Modulations
Use these questions to configure the phase modulation codes that may be used to control
the phase of a coherent transmitter.
Phase Modulation
Select whether the Tx waveforms synthesized by the IFDR have phase modulation applied
to them.
Provide phase modulation of transmitted pulses: YES
Number of binary angle phase bits to use : 8
Phase angle to apply when idle: 0.00 deg (0x0)
Modulation – 0 :None , 1:Random, 2:Custom, 3:SZ(8/64) : 0
Waveform Types
Define the type of waveform to generate on the Tx-A SMA output. In this example a 60 MHz
fixed frequency CW sinewave is generated at 0.0 dBm power level.
The CW wave can optionally be phase-modulated from pulse to pulse, and can be offset by
a fixed phase amount.
Chan A – 0 :Unused , 1:FixedFreq, 2:TxWaveform : 1
FreeRunning fixed frequency : 60.00000 MHz
Output CW power level : 0.0 dBm
Apply pulse–to–pulse phase modulation: NO Fixed relative phase offset :
0.000 Deg
Transmit Waveforms
Select the type of waveform to generate on the Tx-B SMA output.
In the following example, a pulsed transmit waveform is generated with a peak output level
of 0.0dBm. Phase modulation can optionally be applied.
The details of the pulse are defined in the
Mt<n>
menu for each pulse width. See 5.2.6
Mt<n> — Triggers for Pulsewidth n (page 116) .
Chan B – 0 :Unused , 1:FixedFreq, 2:TxWaveform : 2
Output power level: 0.0 dBm , Peak:YES
Apply pulse–to–pulse phase modulation: NO
Transmit waveforms generated by the IFDR are corrected for inherent
sin(f)/f
amplitude-vs-frequency
response of the TxDAC, resulting in a flatter FM chirp
waveform. In addition, the next question lets you supply adhoc frequency band
compensation. The units of this parameter are: percentage amplitude compensation per
MHz of deviation from the IF center frequency. Positive values result in a relative boost of
higher frequencies across the time span of the waveform.
RVP900 User Guide M211322EN-J
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