User's Manual

Technical Manual General Description
1.1.2 Side Panel
The MX800 side view is illustrated in Figure 1-4 below. Two mounting holes
in each side make provision for fitting a slider rail bracket.
les
in each side make provision for fitting a slider rail bracket.
Figure 1-4 MX800 Side Panel Figure 1-4 MX800 Side Panel
Mounting Holes for Slide Rails
Sideways Airflow Permits MX800s
to be Stacked in a Rack
1.2 Module Functional Description 1.2 Module Functional Description
1.2.1 Exciter Module 1.2.1 Exciter Module
The Exciter module generates the low level, on frequency, RF transmitter
signal that is later amplified to nominal output power level by the Power
Amplifier module. The exciter consists of a Voltage Controlled Oscillator
(VCO) and associated main RF board, which, in conjunction with the
reference oscillator and the PLL circuitry, forms a two-point modulation
programmable frequency synthesiser. Frequency programming data is
received from the Micro Controller via a 3 wire serial data bus.
The Exciter module generates the low level, on frequency, RF transmitter
signal that is later amplified to nominal output power level by the Power
Amplifier module. The exciter consists of a Voltage Controlled Oscillator
(VCO) and associated main RF board, which, in conjunction with the
reference oscillator and the PLL circuitry, forms a two-point modulation
programmable frequency synthesiser. Frequency programming data is
received from the Micro Controller via a 3 wire serial data bus.
The exciter module features a modulation bandwidth from DC with an ultra
wide RF bandwidth of 20MHz to 1000MHz at an average RF output power of
300mW. To change from one band to another, all that is required is to change
the plug in VCO board and reprogram the radio. No other manual adjustment
or change is required.
The exciter module features a modulation bandwidth from DC with an ultra
wide RF bandwidth of 20MHz to 1000MHz at an average RF output power of
300mW. To change from one band to another, all that is required is to change
the plug in VCO board and reprogram the radio. No other manual adjustment
or change is required.
Should a high stability reference be required, the exciter can be fitted with a
connector for an external reference oscillator input.
Should a high stability reference be required, the exciter can be fitted with a
connector for an external reference oscillator input.
The fractional N synthesiser provides ultra low spurii while still maintaining
fast lock times even at 6.25 kHz step size.
The fractional N synthesiser provides ultra low spurii while still maintaining
fast lock times even at 6.25 kHz step size.
An optional built in turn around mixer (TRM) provides advanced diagnostics
such as receiver sensitivity tests.
An optional built in turn around mixer (TRM) provides advanced diagnostics
such as receiver sensitivity tests.
© SPECTRA ENGINEERING 2008 Revision 4.3.1B
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