Spectra Engineering MX800R2R3 RF Base Station/Repeater User Manual 1 Intro

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Document ID	234289
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Document Description	Manual ch one
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Document Type	User Manual
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Date Submitted	2002-03-31 00:00:00
Date Available	2002-06-27 00:00:00
Creation Date	0000-00-00 00:00:00
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Document Title	1_Intro.PDF
Document Creator	Microsoft Word
Document Author:	Licensed User

Technical Manual
1. General Description
The MXSOO series employs state of the art design and construction methods
to deliver a range of high pertonnanoe, ultra reliable radio transceivers They
are ideally suited for use in VHF or UHF two way voice radio systems,
however the stoo can perform in a range of applications where the added
advantage of linear frequency and phase response from DC to 3AkHz can be
if utilized. The MX800 uses a two-point modulation method synthesizer for
extended low end VF transmit frequency response. The Receiver, Exciter and
Power Amplifier are contained in their own specialized Aluminium module
and can be easily removed from the main chassis.
The flexibilily of the mxsoo series allows it to be configured for a wide
range of applications
Slandard MXSOO applications include:
Conventional 2-Wny voice base station
Full duplex or simplex base station
Radio modem base station
High speed data transceiver
Trunking base slalion for Ml’rl327, LTR, SmartTmnk and others
Analog Cellular base station
POCSAG paging transmitter to 7.400 BPS
POCSAG repeater
DC-mupled Direct FSK modulation system
Voice repeater
Wide hand data repeater
Dc-coupled repeater
Palm to point link
Fest 25ms multi hopped repeater
000000000000000
Cross band link or repeater
(ZJ SPECTRA ENGINEERING 2000 Reviston 4m 1
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1“ mxam incorporates special Iwhnlul (alum. ofv/llicll llle kn; on: in
listed below.
Emcmcly kw sol-sum allusions
intensely low u-msmilm spurious
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Trimming: frequency lespolne down to DC
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Technical Manual General uescrlpilnn
1.1 Physical Description
The mxsoo is a compact lighlweighl standard 19" rack mounling iranseeiver.
It is designed io mount horizontally in a 19" rack frame and occupies 2RU
(39mm). The deprh of the unit is 330mm and the weight is less ihan ng.
The unit consists of four main sub assemblies an Exciler Module, 3 Receiver
Module, 3 Power Amplifier Module and 2 Micro Conlroller board. These
modules are housed in a fully welded slecl case.
Tire stoo features a high degree of RF] and EMI screening chmughoui the
design and conslmction. The receiver and exciler (low power iransmiller)
modules are cunlxined in solid aluminium enclosures, and for addilional
screening each interface pin in [he modules is individually fillered. The FA
module is contained in a special compacl efficient extrusion for minimum
harmonic iadiiillon. This design results in low conducled and radixled
emissions and minimal susceplibilily lo RFI and EMl.
User inieriace is via the from and rear panels. The rear panel provides aooess
io all conneorors and rhe srandard front panel provides 6 LED indicalois of
the radio siains. The local conrrol option from panel has addiripnal speaker,
microphone and (oprionally) channel selesr funclions. Other variarions can
accommodale serial and momlor porrs as well as VF line level adjnsirnenr on
rhe from panel.
1.1.1 Front Panel
1.1.1.1 Standard Front Panel
The Nixsoa slandard from panel is illusrrared below. Crrsrnrn versions onhe
front panel can be supplied to OEM cusrorners,
Table 1-1 below explains the funvlions of the from panel LED's. Each LED
indicates the slams of lhe MXBlHJ in real lime.
LED FUNCI'ION ‘
POWER lnd arcs the puwer supply volrage rs wilmn sonware
selecralrle horns.
Rx A signal is being receivsri by he receiver or Ihe
receivers squelch is open.-
Tx The transmit!" is lmnsmilting RF power.
crcss A valid Connnnnrrs Torre Coded Squelch Signal has
been delecled.
AUX An Aux iuncrinn is selsered or the I’LL is unlocked.
ALARM A prearranged alarnr mndillon exisls.
Table 1-1 LED Function:
@ SPECTRA ENGINEERING 2000 Revision 4.01 3
anoo Tmnseelvev Technical Manual
Powsv
RX
Tx
01055
Aux
Alarm
Figure 1-1 Standard From Panel
1.1.1.2 Local Control Front Panel
The meal (Tommi From Panel is illustrated in Figure 1-2 below.
Speaker Rszaa Pun Line IIP Adjusl Hale
Push/wheel Digual Monitor R145 Squelsh Line O/P
channel change Up/Down Pm Mlcmphone Adjust Hnle Miusl Hale
Volume Socket
Figure 1—2 Local Control me Panel
It has the same LED indicators 25 the standard ("mm panel as well as (he
following fealures
0 Loudspeaker and Volume Comm]
A 1 Wall loudspeaker is pmvldcd lo monitor ‘on nir’ received audio as
well as uansmil audio from line. Volume cnmrol is provided by means
or a 3 posluon loggle swilcll adjacenl lo the loudspeaker. This swireh is
biased in llie cenlre posilion. To raise or lower rhe volume lhe swileh ls
momentarily moved up or down respeeuvely. Foreach swilcll closure
lhe volume is incremented or decremented a fixed amount
The speaku has a link selecrable oonneclion lo a lone oulpuz from |l|=
an SPECTRA ENGINEERING 2000 Revision 4.01
Tscmlwtl Menuel General Description
microcontioller. This may be used in conjunction with the appropriate
software configuration to generate an alert tone to the user.
e Microphone Socket
An R145 socket is provided for connection of a microphone.
0 Channel change Control
Twin push-wheel switches can be optionally fitted to the front panel to
allow selection of the operating channel. This switch replaces the
channel select funclion normally accessible on cm on the rear panel. 99
channels are selectable. Refer to section 2.2.2.3 for channel select
method.
Q 115232 and Monilnr Ports
Provision is made to optionally fit these two connectors on the front
panel instead of on the rear panel. The pinrout and functions of these
two parts remain unchanged when this is done.
e Mute 1 Sqnelch Adjustment
Provision is male to optionaUy locate the mute/ squelch comm]
palentiomeler behind the film! panel, A screwdriver hole is provided in
the front panel to access this adjustment.
e line Level Adjustments
Provision is made In upticinally locale the line 1/0 level comm-1
potentiometers behind the front panel. A screwdriver hole is provided in
the front panel to access each of these adjustments.
GSPECTRA ENGtNEEHiNG 2000 Revision 4m 5
stoo Truly-swivel Technical Manual
1.1.2 Rear Panel
Figure 1-3 below and Table 1-2 details the funcliuns Oleach Connector.
Currn Type Fuuci on one p an
3 PIN DC Power rnpul 13,3 Volt DC pcwcr rnpu Also +23 Voll
inpul an spare pin if required.
N TYPE Simplex relxy out or iasariorr for inlernul simplex relay. m-
N iype RX inpur anlennu for RX/ TX edunecrs m this poinl.
Allemnlively arr NeType ommeclor can be
used for lire rnpur lo lire reeerver [or full
duplex operarion.
BNC RX input Standard ENC connecmr for (he inpul |D the
L receiver for full duplex uperulidn.
N TYPE TX uulpur The RF power Dulpul from rire rrerrsruirler fer
full duplex uperalion.
R145 Spare Knockoul provrsiun [or R145 wnnoclur.
DBZS-F Parallel ”0 Provides on: 8 hi! mpul purl. On: parallel 8
ml BCD ar Binary enannel seleel inpul and
one Sebil ourpur porr.
DBlS-F Line l/O Provides lire necessary analcg receiver and
rransmirler rulerfaoe [or syslem inlertueing.
DB9~M 115-232 sm'al pan 9500 Band serial pan for frequency
programming, clrurrnel selecrian and alarm and
slalus meniloring.
BBQ-F Monilor pun valsion for special moniloring ofccmin
inreruel sigmls.
., as? Table 1,2 Rear Panel Connecliam
Simplex Relay 0]? or
N-Tvpe RX input CNS
BNC Rx
lnpul or
DC Fewer Exlemal Rel N-Type TX Thermally
Inpul CNS Inpul CN7 omwl CNB Cofmolled fan
cNg cm CM! CM ch
HMS Drglrall/o LlneI/O aszaz Monilov
Figure 1A; mxsoo Rear Panel
6 0 SPECTRA ENGINEERING 2000 Revislon 4m
ston Transceiver Technical Manual
1.2.2 Receiver Module
The receiver module accepts the low level RF input signal and amplifies,
filters and conditions the signal prior to detecting the wanted audio
component. The Receiver module features the same advanced synthesizer and
wide bandwidth as the exctter. Only the front—end bandpass filter and VCO
need to be changed in order to suppon different frequency bands, resulting to
significant flexibility and end-user cost savings. The purpose built from end
bandpass filter has a wide nu—adjust bandwidth equal (0 the band allocation
(refer (0 section 7.4 for details of the band allocations),
The receiver has high sensitivity while maintaining excellent intermodulitinn
immunity and adyaeent channel rejection. A dual first IF fitter provides
excellent rejection to common known spurious responses. High blocking of
over lands typical ensures that strong interfering signals do not desensitise
the receiver when receiving weak signals.
1.2.3 Power Amplifier Module
The PA receives the low level modulated RF signal from the Exciter and
amplifies and filters it to final output power level. Forward and reflected
power indications are ted to the Micro Controller card.
The no. is very compact and efficient for high reliability and low cost. The
heatsink has minimal temperature rise even under continuous operation.
ensuring the best MTBF obtainable for a practical design. A low loss 13
element elltplical low pass filter ensures that harmonics remain below
30 dBc.
1.2.4 Micro Controller Board
The Micro Controller Board is physically located behind the rear panel
connectors and all signal connections (apart from the RF connections)
external to the transceiver are made via the controller card. User sellable
jumpers and DIP switches are located on the card as are level adjustment
potentiometers.
The Micro Controller controls the operation of the RF modules and acts as
the interface between the user connections, indicators and the RF modules. It
processes transmit and received audio to and from the Exciter and Receiver
modules as well as providing the digital 1/0 functions of the transceiver.
The circuit board has an onboard EEROM in which is stored all of the us=r
channel related data such as frequencies, CTCSS tones etc. A serial port at
the rear (or optionally the front) of the MXSOO provides access to the
Onntroller card and in conjunction with the Spectra Engineering
"MXTOOLS" programming utility allows the user to create and change this
channel related information. Use of the "MXTOOLS" utility is covered in a
separate manual.
Special functions capable of being can'ied out by this card include non-
predictive full duplex mss encoding/decoding, DCS encoding/decoding as
5 an SPECTRA ENGINEERING 2000 Revision 4.01
Taamlcal Manual General Descfwbn
well as 1:st and Arlevel FSK modems. Digjpols under the 00mm] of Ike
processor elm-rs thzl user set up levels for TX devialion and power levels are
correclly sel for each channel.
e SPECTRA ENGINEERING 2000 Revision 4.01 9

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Creator                         : Microsoft Word
Create Date                     : Tuesday, April 03, 2001 11:09:32 PM
Title                           : 1_Intro.PDF
Author                          : Licensed User
Producer                        : Acrobat PDFWriter 3.02 for Windows
Subject                         : 

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