USER’S MANUAL__________________________________________________________________
128 _________________________________________________________________ M211322EN-D
During the middle 90% of the waveform's duration the frequency chirp
uses 70% of its available bandwidth. Then, within the 10% pulse tails, the
remaining 30% of the bandwidth suddenly gets covered. No amplitude
modulation is applied. Pulses of this type have been studied theoretically,
but do not perform very well for a given total bandwidth that includes the
leading/trailing "ears".
P1 = 0.9, P2 = 1.0, P3 = 0.8
The entire frequency band is chirped within the middle 90% of the pulse
duration, so that the frequency remains constant in the 10% pulse tails. An
amplitude modulation is also applied over 20% of the pulse tails, that is,
encompassing both the ends of the chirp and the entire constant frequency
intervals. Pulses of this type have superior sidelobe behavior and fit very
neatly within their prescribed bandwidth limits. We recommend using
non–linear FM waveforms that combine chirp limits and amplitude
modulation in this manner.
4.2.6 Mb — Burst Pulse and AFC
These questions are accessed by typing Mb. They set the parameters that
influence the phase and frequency analysis of the burst pulse, and the
operation of the AFC feedback loop.
Tx Intermediate Frequency: 30.0000 MHz
Rx Intermediate Frequency: 30.0000 MHz
These are the centers of the transmit and receive intermediate frequency
bands. Although the Tx and Rx intermediate frequencies are generally
identical, they are chosen separately so that the RF up-conversion chain for
transmission could be different from the down-conversion chain for
reception.
The usable Tx and RX bandwidth is delineated by 4MHz safety zones on
either side of integer multiples of half the IFDR synthesized clock
sampling frequency. The values entered here implicitly define which of
those alias bands is being used.
Limits: 6 MHz to 72 MHz
To Next Page
Loading...
Need help?
General