Technical Manual Appendices
© SPECTRA ENGINEERING 2006 Revision 4.2.3
113
7.5 MX800 System Applications
Comprehensive standard features along with a wide range of options and
accessories available to it mean that the MX800 is capable of being used in
many different applications. The most common of which are mentioned
below together with notes where applicable on the relevant aspect of the
MX800.
Figure 7-2 MX800 Setup in system rack
7.5.1 Conventional base station/repeater
Upper tier RF performance figures make the MX800 an excellent choice for a
conventional base station or repeater. The PA is continuously rated and
receiver figure of merit parameters such a sensitivity, intermodulation and
selectivity are all of a high standard. Independently adjustable PTT and
CTCSS tails mean that the mute crash can be eliminated in mobiles when
base transmit CTCSS is used. A 40ms RX audio delay option (T08) similarly
facilitates the elimination of the mute crash in the base station side.
As standard feature when the CTCSS encode/decode option is selected is
multiple tone groups. In excess of 25 tones can be selected as valid CTCSS
tones on a shared RF channel. Provision is made in the programming
software to enter tone pairs for each group without restriction on how the
tones are selected.
Many other attributes of the MX800 and its options are useful in conventional
base/repeater systems. For example:-
♦ Programmable channel bandwidth
♦ DCS / Digital Private Line
♦ Range of front panel functions available
♦ Optional two wire four wire operation
♦ Tone PTT with programmable PTT tone
♦ Optional balanced and isolated VF I/O and signaling lines
7.5.2 Link transceiver
In the UHF bands (400 to 520 MHz) the MX800 is available in 1W and 50W.
The 1W version being intended for link transceiver application. Transmit and
receive audio is conveniently brought out to the D15 connector on the rear of
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