Radyne MM200 Installation And Operation Manual page 31

MM200 High-Speed Microwave Modem
ACQ CONTROL
ACQ BW (kHz)
ACQ DELAY (sec)
REACQ DELAY (sec)
ACQ STEP (kHz)
TRACKING STEP (Hz)
DIVERSITY (menu):
MODE
TM086 - Rev. 4.1
of time set in ACQ DELAY (sec).
3. Step the Demodulator frequency up
one step size programmed in ACQ
STEP (KHz).
4. Repeat Steps 1 through 3 until the
Demodulator Frequency exceeds the +
side of the ACQ BW.
5. Set the Demodulator to the negative
side of ACQ BW.
6. Repeat until demodulator acquires.
Once acquired, the demodulator will
have an offset between the frequency
at which the demodulator is set and the
incoming signal frequency. This is due
to demodulator frequency acquisition
window and radio drift. This can cause
degraded performance and, in the case
of radio drift, possible loss of lock. To
overcome this, once acquired, the
demodulator reduces this offset to 0 Hz
by slowly incrementing/decrementing
the demodulator frequency. The speed
can be adjusted by adjusting the
TRACK STEP (Hz). It is suggested
that this parameter normally be set to
10 Hz.
{Off, Acquire}
Always set to Acquire.
{50 KHz – 400 kHz}
Sets the ± acquisition bandwidth. There is
a tradeoff between this number and
acquisition speed.
{10 – 255 sec}
Sets the time that the demodulator stays
at a frequency before trying the next step.
{10 – 255 sec}
Sets the time that the demodulator
remains at frequency after it first loses
lock.
{10 – 100 kHz}
Sets the frequency step size the
demodulator will take when trying to
acquire.
{10 – 100 Hz}
Sets the step size that the demodulator
will use to remove the frequency error of a
locked signal. Normally set to 10 Hz.
Diversity
{Disable, Auto, Force A, Force B}
User Interfaces
RW
RW
RW
RW
RW
RW
RW
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