Spectra Engineering MX800R2R3 RF Base Station/Repeater User Manual 3 Options

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Date Submitted	2002-04-01 00:00:00
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Technical Manual
3. Options
3.1 T01 Programmable Channel Spacing
‘l'lte mxsoo receiver is available in five different channel spacing options.
For applications in systems which require both 12.5kl-lz and 25kHz chauuel
spacing option T0] allows channels to be programmed for either bandwidth.
Switchable IF filters in the receiver and automatic 12.5kHz/25kHz gain
compensation in the audio paths make the change in bandwidths transparent
to the user.
This option must be specified at order placement. Once the switchable IF
bandwidth receiver is fitted, the programmable channel spacing option is
selected on the MXToom Configuration screen (Hardware Settings rab)aud
each channel is programmed as eilher 12,5kHz/‘25kHz via the Channel Edit
scteen. See lhe MXTOOLS user handbook for details.
3.2 T02 Programmable CTCSS encoder/decoder
Provision is made in the mxsoo to fit a crcss encoder/decoder. The
decoder is non-predictive and any valid crcss tone can be decoded. Any
standard TX crcss tone may be associated with the programmed decode
tone through the Channel Edit screen in MXTOOLS. Multiple cross tones
are programmable for any channel providing "Community Repeater"
functionality. See the MXTOOLS user handbook for details
This option may be fitted at order placement or retro fitted subsequently,
3.3 T03 Programmable DCS/CTCSS
encoder/decoder
Provision is made in the MXBOO to fit a full duplex DCS encoder/decoderr
There are 83 digital codes available. Any standard DCS code or CTCSS tone
may be assigned to any of the transmit or receive channels through the
Channel screen in MXTOOLS. Multiple CFCSS tones are programmable for
any channel providing "Community Repeater" functionality. See the
MXTOOLS user handbook for details
The DCS encoding function provides continuous, repetitive digital word
modulation to the transmitter, The decode function controls receiver muting
to eliminate all calls that are not coded with the assigned DCS code
This option may be fitted at order placement or retro fitted subsequently. The
DCS PCB assembly is fitted in place of IC75 (Fxsos). Once the DCS option
is fitted the "DCS oplion fitted“ check box is ticked in (he MXTOOl-S
Configuration screen and the encode and decode codes are programmed
through the Channel Edit screen
Refer circuit diagram csoom
to SPECTRA ENGINEERING 2000 Revision 4.01 19
MXBOO Transceiver Temnlsal Manual
3.4 T04 Balanced and Isolated VF
Standard VF connections to line are SOOOhm 4-wire unbalanced. Option W4
may be fitted if transformer balanced and isolated VF inputs and Outputs are
required. A transformer PCB is fitted internally at the rear of the MXEOO.
This PCB has 21 R145 connector (CNQ) which protrudes through the rear
panel when this option is fitted and the balanced VF outputs are made
available via this connector.
Note that theses connections are essentially in parallel with the standard VF
connections on CNI. The VF lines on CNI are still connected when option
T04 is fitted and care should be taken the! the TX VF line is not doubly
terminated or that two VF sources are net presented to the transmitter.
Pin No Funcfinn
1 6000hm balanced RX VF leg a
z 6000hm balanced RX VF leg h
3 amnlrm balanced TX VF leg 8
4 500mm balanced “rx VF leg h
5 NC
6 NC
,______4.
7 NC
8 NC
Table 3 »1 CN9 Connections
The R145 pins are numbered as shown in Figure 3-1 below,
Figure 3.1 CN9 R145 Pin-out Detail (VimfromRetzr ofMXBDO)
Refer circuit diagram CSOlB-l
20 e SPECTRA ENGINEERING 2000 Revision 4m
Technical Manual Oplions
3.5
T05 Balanced and Isolated VF plus E&M
Option T05 provides the balanced and isolated VF 1/0 as per option T04 as
well as isolaled E (m) and M (Mute) leads.
Note Jumpers referred to in the lzble below are those on this option PCB.
The E lead is apto isolated and may be assened by applying a DC vollage
between sv and 4sv wilh any polarity between CN9 Pins 7&8 (JMPl in
posiiion 2-3, IMPZ removed). Provision is also made lo lniernally source the
activation voltage (+12V DC) in which case the E lead is assened by
grounding CN9 Pins (JMPl in posilion 1-1er2 fined.)
The M lead is relay isolated and the common and normally open contacts are
brought oul via CN9. If the imemal +12V DC is being used as the activation
Voltage for the E lead (JMPl in position 1-2) then the normally closed Contact
is also available at CN9. The relay oonaaers are rared at 250mA.
Pin No Function
sonolun balanced RX VF leg a
6000hm balanced RX VF leg I)
6000hm balanced TX VF leg a
fiOOohm balanced TX VF leg 17
M Lead common
M lead normally open
E Lead leg and lead normally closed
E Lead leg b
ooqasmounra
Table 3-2 CN9 Connectiam
Tire R145 pins are numbered as shown below
Figure 3-2 CN9 R145 Pin-our Detail (Viewfiom Rear ofMXSW)
Refer circuit diagram CSOlS-l
la SPECTRA ENGINEERING 2000 Revision 4.01 21
MXBOO Transceiver Technical Manual
3.4 T04 Balanced and Isolated VF
Standard VF connections to line are 6000hm 4-wire unbalanced. Option T04
may be fitted if transformer balanced and isolated VF inputs and outputs are
required. A transformer PCB is fitted inlernally a! the rear of Ihe MXSOO.
This PCB has a R145 conneclor (CN9) which prolnldes through the rear
panel when this option is fitted and the balanced VF outputs are made
available via this connector.
Note that theses connections are essentially in parallel with the standard VF
connections on CNl. The VF lines on UN] are slill connected when option
104 is fitted and care should be taken that the TX VF line is not doubly
terminated or that two VF sources are not presented lo the transmitter.
Pin No Function
1 GOOohm balanced RX VF leg a
Z 6000hm balanced RX VF leg b
3 6000hm balanced TX VF leg 3
4 SOOOhm balanced TX VF leg I)
5 NC
NC
NC
NC
Table 3-1 CN9 Connections
The R145 pins are numbered as shown in Figure 3-1 belowi
Figure 3-1 CN9 R745 Pimoul Detail (Viewfmm Reqr 0fMX800)
Refer circuit diagram CSOIS-l
20 © SPECTRA ENGINEERING 2000 Revision 4.01
Technical Menu-l Options
3.5 T05 Balanced and Isolated VF plus E&M
Option T05 provides the balanced and isolated VF 1/0 as per option m as
well as isolated E (PIT) and M (Mute) leads.
Note Jumpers referred to in the lzble below are those on this nptiml PCB.
The E lead is opto isolated and may be asserted by applying a DC voltage
between 5V and 48V with any polarity between CN9 Pins 7&8 (JMPl in
position 2-3, JMPZ removed). Provision is also made to internally source lhe
aclivalioll voltage (+1ZV DC) in which case the E lead is assened by
grounding CN9 pins (JM'Pl in position 1-2, IMPZ fitted.)
file M lead is relay isolated and the common and normally open canlzels are
brought on! via CN9. If the imernal +12V DC is being used as the activation
voltage for the E lead (JMPI in position 1-2) lhen the normally closed contact
is also available 31 CN9. The relay contacts are rated at ZSUmA.
Pin Nu ‘ thcn‘on
6000hm balanced RX VF leg in
600011111 balanced RX VF leg b
fiwohm balanced TX VF leg 3
GOOollm balanced TX VF leg b
M Lead common
M Lead normally open
E Lead leg x/M lead normally closed
E Lead leg n
OOxIOtU‘AuNn-a
Table 3-2 CN9 Connections
The R145 pins are numbered as shown below.
Figure 3-2 CN9 R145 Pin-out Detail (Viewfmm Rear ofosoo)
Refer circuit diagmm CSDIS-l
® SPECTRA ENGINEERlNG 2000 Revision 4,01 2‘
anno Transceiver Technical Manual
3.6
3.7
3.8
TOG Simplex Changeover Relay
For simplex applications an internally mounted coaxial changeover relay can
be provided. This mounts on the rear panel and the common port protrudes
through the Chassis providing the simplex antenna connection. The relay
normally closed port is internally connected to the MX800 receiver and the
normally open port is connected to the transmitter via the standard RX
connector hole in the chassis (the RX connector is removed) using a special
cable assembly. The relay also has control connections to the micro controller
PCB.
Once the relay option is fitted the channels are programmed as simplex
channels through the Channels Edit screen of MXTOOLS. Switches SWZ/l
EL SW2/2 on the micro controller are switched ON to delay the transmitter
PIT (to allow the relay to changeover) and set the simplex operating mode
respectively,
T07 Turn Around Mixer
This option is not currently available.
T08 VF Delay
This option provides a 40mS delay to the received audio. When the option is
fitted delayed audio is fed to the line and talkthrough paths but discriminator
audio (output on an Pin4) is undelayed.
This option is intended for two main applications. Firstly when the delay is
fitted the mute "stash" chameteristieally heard when a mobile releases its
P'l'r but the repeater tail continues, it is eliminated. Secondly systems
(including trunking systems) which have mixed voice and data on a channel
can delay the VF signal to line and air so that in the event that a data stream is
detected (by the data controller) the VF to line and air can be disconnected
for the duration of the data burst thus avoiding radio system user annoyance.
Internal switches in the MXEUO may be used to disconnect the audio under
the control of the RX TALK line (CNl Pin7) the sense of which may be
inverted using JMP12 on the micro contmller.
This option may be fitted at order placement or retro fitted subsequently. The
Option PCB assembly is fitted above the Micro controller on four hex pillars.
A 16-way ribbon connection is made from the Option TCB to SKK on the
micro controller card. The links on the Option card are set as below. Once the
delay option is fitted the "Delayed Audio Option" check box is ticked in the
MXTOOLS Configuration screen (Hardware settings tab).
Note that this options PCB is also used for m9, Crcss Suppression
Upgrade Filter and 1-10, the Low Standby Current Mode and all three are
independent and may be used separately or together, If the option PCB is
ordered for one panicular option it may or may not be populated for the other
options.
‘22
Q SPECTRA ENGINEERING 2000 Revision 4.0t
Technical Manual
JMP ' Option Ac
JMP 1 low slandby current mode Out In
switched excite! power
IMP 2 Low standby Cur"!!! mode on! In
switched receiver power
JMP 3 _| 3001-11 Elliptic filter 1»2 1-3
IMP 4 RX audio delay 2-3 1-2
3.9
Table 33 Option PCB Link Settings
Refer circuit diagram CSOZZ-IA
TOQ CTCSS Suppression Upgrade Filter
This option provides upgraded CT CSS tone suppression on the RX VFr
When this option is fitted the standard 300Hz filter is removed from circuit
by changing the position of IMPS on the micro controller to position 1»2,
This option may be fitted at order placement or retro fitted subsequently. The
Option PCB assembly is fitted above the Micro controller on four hex pillars.
A 16-way ribbon connection is made from the Option PCB to SICK on the
micro controller card. The links an the Option card are set as below. This
option is purely a hardware change and no configuration is required using
MXTOOLS.
Note that this options PCB is also used for T08. VF Delay and T10, the Low
Standby Current Mode and all three are independent anti may be used
separately or together. if the option PCB is ordered for one particular option
it may or may not be populated for the other options,
JMP
JMPl
Fun
on/Descnp on Oplion Active Option Dis-bled
Low standby current mode Out In
switched exciter power
JMP 2
Low standby current mode out in
switched receiver power
IMP3
300Hz Elliptic filler 1-2 2-3
JMP4
RX audio delay 1.3 ' 1»2
Table 3-4 Option PCB Link Settings
(0 SPECTRA ENGVNEERING 2000 Revision 4.01 53
MXBOO Transceiver Technical Manual
3.10 T10 Low Standby Current Mode
For solar powered sites and other power critical applications the MXSOO is
capable of a Low Standby Current Mode. This option can be implemented in
three stages. Stage one implementation replaces the micro controller linear
voltage regulators with switching regulators. Response times are unaffected.
Stage two involves removing power from the exciter when the radio is in
standby mode. In this case RX responses times are unaffected, In stage three
the RX power is cycled on and off at a user selectable duty cycle. Essentially
the choice of mode of operation involves a compromise between response
time and average current consumption. Current consumption of ZSOmA is
achievable with a typical response time in the order or 1scc.
. . ~ . . Appm Average
Cundtttou r. Description ‘ Cum“! mm m
Standard Standard MXEOO (TX VCO on continuously) 525
Standard Sundzrd MXBOO (TX VCO switched) 490
Stage la Standard wtxsoo (Tx vco on continuously) 475
option board fitted
Stage lb Standard mxsoo (TX sm'tched) option board 440
fitted
Stage 2 TX exciter inc TX VCO powered down 370
Stage 3 TX exciler inc TX VCO powered down 370
RX 10095 duty RX module power duty cycled
Stage 3 TX exciler int: TX VCO powered down 255‘
RX 50% duty RX module power duty cycled
Stage 3 TX exciier inc TX VCO powered down 198'
RX 259; duty RX module power duty cycled
'Avtng( current calculation is lured nn llx ollcurrenl dtrtn of 1mm and Rx on current drain ni370mA.
Table 3-5 Current Consumption Details
This option may be fitted at order placement or retro fitted subsequently. The
Option PCB assembly is fitted above the Micro controller on four hex pillars.
A lfi-way ribbon connection is made from the Option PCB to SKK on the
micro controller card. The links on the Option card are set as below. Once the
power save option is fitted the "Power Save Option Board Installed" and
“Power Save Exciter Module" check boxes are ticked in the MXT 0015
Configuration screen (Hardware settings tab). In addition three timers need to
be set. "Idle Time to Power Save" is entered in seconds and defines how long
the radio will wait following the most recent activity before reverting to
standby mode, ”RX Mudule On Time" and "RX Module OFF Time" define
the duty cycle of the receiver module.
Note that this options PCB is also used for TOS, VF Delay and T09, CTCSS
Suppression Upgrade Filter and all three are independent and may be used
separately or together. If the option PCB is ordered for one particular option
it may or may not be populated for the other options. If the option is being
retrofitted the two main 5 Volt 78M05 regulators on the Microoontroller
board must be removed and subsequently replaced ifde-inslillling.
24
© SPECTRA ENGINEERING 2000 Revision 4.01
Technical Manual
JMP Fuuc Option Ac ve
JMP 1 Low standby current mode Out in
swirclred exciter power
IMP 2 Low slandhy current mode 0ur In
swilched receiver power
IMP 3 300m Elliptic filler , 1-1 2-3
1er 4 RX audio delay 1-3 1-2
Table 3-6 Option PCB Link Setting:
Refer circuit diagram CSO22-1
3.11
3.12
T11 Combined Options
This oplion combines the functions and features of ms. 109 and no
T12 External Reference Oscillator Input
The MXSOO receiver and transmitter modules have separate reference
oscillators. in normal operation to achieve a low frequency transmitter
modulator frequency response to DC the ston normally uses a two-point
modulalion method, The TX reference oscillator and the VCO are both
modulated Option 112 provides for the TX reference frequency to be
externally injecled. Ari SMB connector is filled to the exciter and an inlernal
cable is provided from there to a chassis mounl N Type connector inlo which
the external reference frequency is injected. As two-point modulation is not
possible wiih this configuration transmitter frequency response is only
specified to 67Hz for this option.
@ SPECTRA ENGINEERING 2000 Revision 4.01 25
MXEDO Transcerver Technical Manual
3.13 T13 Local Speaker and Mic
For applications needing a user interface at the base station the mxsoo is
available with the Local Control option. When fully implemented the Front
Panel is as illustrated below. It has the same LED indicators as the standard
front panel as well as the following features
Line IIF‘
R5232 Port Adjusl
- l "at? WW“
, .
ea
Channel Loud Volume Monitor Microphone Squslcn LlneO/P
Change Speaker Control F‘orl Adjust Adjust
Figure 3.3 antl’arlel (Fully Implemented)
0 Loudspeaker and Volume Control
A 1 Watt loudspeaker is provided to monitor 'on air' received audio as
well as transmit audio from line. Volume control ls provided by means
of a 3-position toggle switch adjacent to the ioudspeflken This switch is
biased in the centre position. To raise or lower the volume the switch is
momentarily moved up or down respectively. For each switch closure
the volume is incremented or dccremented a fixed amount.
The speaker has a link selectable connection to a tone output from the
micro controller. This may be used in conjunction with the appropriate
software configuration to generate an alert tone to the user.
0 Microphone Socket
An R145 socket is provided for connection of a microphone This socket
is wired compatihly with the Motorola GM3OO microphone.
0 Channel Change Control
”min push wheel switches can be optionally fitted to the front panel to
allow selection of the operating channelr When fitted this switch is wired
to the channel select pins on CNJ, the rear channel select port, and
replaces the channel select function normally accessible on that
A connector, 99 channels are selectable. Refer to section 2.2.2.3 for more
details on alternative channel select methods.
Q 115232 and Monitor Ports
Provision is made to optionally fit these two connectors on the front
panel instead of on the rear panel. The pinoul and functions of these two
ports remain unchanged when this is done.
0 Mute / Squelch Adjustment
Provision is made to optionally locate the squelch control potentiometer
26
61 SPECTRA ENGINEERlNG 2000 Revlston 4.01
Technical Manual Oplions
behind the front panel. A screwdriver hole is provided in the front panel
to access this adjustment,
0 Line III) Level Adjustment
Provision is made to optionally locate the line in and line out level
potentiometers behind the front panel. A screwdriver hole is provided
alongside the squelch adjustment hole in the front panel to access this
adjustment.
Note Note that it is possible to select some features of the Local Control
Option and omit others, For example operating channel select from the front
panel may not be required (or permitted) and the Local Control Option may
be ordered without this feature Consult Spectra Engine ‘ g for data
Refer circuit diagram C5001-6 sheet 6 oft?
3.14 T14 Local Channel Change
See T13.
3.15 T15 RF and Line FFSK Modems
This option provides for Fx429A FFSK modems. Two modems may be fitted
one facing toward the Line port and the other to "Air”. Consult Spectra
regarding application software and hardware for this option.
3.16 T16 1PPM Frequency Stability 12.5 kHz, N to
X Bands
This option provides for 1PPM frequency stability for nnrruwband MX800s
in the N to x hands, This frequency stability is specified from -30° c to
+60“ C.
3.17 T17 1PPM Frequency Stability 25 kHz, R to X
Bands
This option provides for 1PPM frequency stability for wideband MXBDOs in
the R to X bands. This frequency stability is specified from —30" C to +60“ C.
3.18 T18 Extended Temperature Range
The mxsuo is optionally available in an extended operating temperature
range version ooverirrg -30° c to 40" 0. Frequency stability is specified at
2.5mm for this option.
0 SPECTRA ENGINEERlNG 2000 Revision 4.01 27

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Title                           : 3_Options.PDF
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