Vaisala RVP900, User Manual

Page: 95 / 484

More Information
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Mb — Burst Pulse and AFC (page 93)
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Mc — Top-level Configuration (page 102)
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Mf — Clutter Filters (page 104)
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Mp — Processing Options (page 107)
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Mt — General Trigger Setups (page 113)
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Mt<n> — Triggers for Pulsewidth n (page 116)
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Mz — Transmissions and Modulations (page 126)
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M+ Debug Options (page 127)
5.2.1
Mb
— Burst Pulse and AFC
Type Mb to view and manage parameters that influence the phase and frequency analysis of
the burst pulse, and the operation of the AFC feedback loop.
When set to
YES
, the functions that implement phase locking and tracking as well as AFC
and MFC functionality use only the primary RX channel.
In dual polarization systems, for these functions, the 2 separate input pulses are not
monitored.
Frequency and Power Parameters
The following parameters define the centers of the transmit and receive intermediate
frequency bands. Although the Tx and Rx intermediate frequencies are usually the same,
you can choose them separately so that the RF up-conversion chain for transmission can be
different from the down-conversion chain for reception.
The usable Tx and RX bandwidth is delineated by 4 MHz safety zones on either side of
integer multiples of half the IFDR synthesized clock sampling frequency. The values here
implicitly define which alias band is used.
Limits: 6 ... 72 MHz
Tx Intermediate Frequency: 30.0000 MHz
Rx Intermediate Frequency: 30.0000 MHz
The intermediate frequency is derived at the receiver's front-end by a microwave mixer and
sideband filter. The filter passes either the lower sideband or the upper sideband, and
rejects the other.
Depending on the chosen sideband, an increase in microwave frequency may increase
(STALO below transmitter) or decrease (STALO above transmitter) the receiver's
intermediate frequency. This parameter influences the sign of the Doppler velocities
computed by RVP900.
IF increases for an approaching target: YES
Chapter 5 – TTY Non-volatile Setups
93