Overview
The MX921, low current Repeater and Base
Station solution, is designed from the ground up for the absolute
lowest power consumption and features the lowest current draw of
any professional high performance Repeater/Base Station. Product
offerings today reduce power wastage by constantly duty cycling
(time slice, sleep mode) the receiver on and off. This has no advantage
when the receiver is receiving and only serves to significantly
slow the response of the receiver carrier detection time and resultant
Repeater wake-up time. Other alternatives degrade the RF performance
to unacceptable levels. The MX921 does not sacrifice any of these
critical requirements and in fact still achieves a level of performance
few competitors can provide at any power consumption level.
A few relevant specifications below will illustrate the point.
Even if your application is not Solar powered, the MX921 can
deliver the high performance and advanced features you need in
today’s congested Radio Spectrum.
An optional internal Solar Regulator and intelligent Battery
Manager inside the MX921 makes it the stand out choice for remote
sites.
Specifications
This document is also available in
PDF Format.
Minimum performance to exceed the following for 148MHz to 520MHz*:
- AS4295-1995,
- R&TTE EC Directive 1995/05/EC
- EN300 086 –1,2 (2001- 03),
- EN 300 113, EN 301 489 – 1,5 (2002 – 08)
- EN 60950 (2000)
- RFS25, RFS26, RFS32,
- TIA/EIA-603,
- BAPT 225 ZV 1/2098 (German soft keying),
- FCC Part 22, 74, 90, 90.210, 80.475,
- MIL-STD-810E (Parts thereof),
- RSS119 Issue 6
* Conforms but not all approved.
Approvals:
- FCC: OKRMX920
- CE/R&TTE: CE1313!
- IC: 50605A
- AUST: AS4295
GENERAL
Frequency Range: Coverage 148-520 MHz.
Band |
Frequency Range |
Band D3 |
148-174 MHz |
Band N2 |
400-435 MHz |
Band O2 |
435-470 MHz |
Band P2 |
450-485 MHz |
Band Q |
485-520 MHz |
Feature |
MX921
|
Synthesis Method |
Non-mixing PLL.
Fractional N synthesizer. |
Modulation |
Direct FM two-point method. |
Channel Spacing |
Programmable 25kHz / 12.5 kHz
|
Synthesizer Step
Size |
6.25kHz or 5kHz auto select |
Channels |
99 front panel selectable,
255 PC software selectable |
Supply Voltage |
13.8 +/- 20% |
Operating Temperature |
-30 to +60C |
Physical Size
|
2RU Case, 325mm deep including
fan |
Standard LED
indicators |
Power, RX, TX, Tone, Alert, Repeater. |
Standard Switches
|
Two press button type. |
Standard Controls
|
Volume knob, Squelch screwdriver
adjust. |
Interface |
Front panel Microphone accessory
socket, speaker,
rear connector DB25. Location for DB9 x 2, DB15, RJ45. |
Weight |
8kg |
CURRENT CONSUMPTION
Feature |
MX921
|
Standby |
<60mA receive, typical 55mA.
|
Receiving |
<60mA receive, typical 57mA.
|
Receiving and
*2Watt TX RF output |
<850mA (1Watt PA module)
|
Receiving and
25Watt TX RF output |
<5.5A, typical 4.9A. |
Receiving and
50Watt TX RF output |
<10A, typical 7.8A. |
* 2W RF Output, not guaranteed when using 1W PA module.
TRANSMITTER
MEASURED IN ACCORDANCE WITH TIA/EIA-603 STANDARDS
Transmitter Feature |
MX921
|
RF Power Output |
1W to 50W or 0.1 to 2W* UHF PA opt (1W nominal) |
Frequency Stability
>300MHz
< 300MHz |
–10 to 60C for 1.5PPM, –30
to -10C for 2.5PPM
–10 to 60C for 2.5PPM, –30 to -10C for 5PPM |
Audio Response |
Flat within +1,-3dB across BW
|
Audio Bandwidth |
300Hz to 3000Hz |
Modulation Distortion |
Less than 3% @ 60% deviation |
S/N Ratio |
Better than 50dB, (WB).
Better than 44dB, (NB). |
Conducted Spurious
Emissions |
Better than -90dBc |
Conducted Harmonic Emissions
|
Better than -90dBc |
RF Switching
Bandwidth |
Full Sub band |
RF Switching Bandwidth
PA |
Full Sub band |
Duty Cycle |
100% for 50W RF output |
RF Rise Time |
<50mS with VCO in cold standby
|
* 2W RF Output, not guaranteed when using 1W PA module.
RECEIVER
MEASURED IN ACCORDANCE WITH TIA/EIA-603 STANDARDS
Receiver Feature |
MX921
|
Sensitivity |
Better than -120dBm for 12dB SINAD.
Typical -123dBm |
Selectivity 135-520MHz |
More than 85dB for 25kHz adj channel.
Typical 90dB
more than 75dB for 12.5kHz adj channel. |
Audio Bandwidth |
300Hz to 3000Hz (+1,-3dB) |
Image Freq Rejection
|
Better than 100dB |
Spurious Response
Immunity |
Better than 85dB. |
Intermodulation
Immunity |
Better than 82dB.
Typical 84dB |
Blocking |
Better than 100dB at +/- 1MHz
point |
Distortion |
Less than 3% @ 60% deviation |
Frequency Stability
|
–10 to 60C for 1.5PPM,
–30 to -10C for 2.5PPM |
S/N Ratio |
Better than 50dB (WB).
Better than 44dB (NB). |
Co-Channel Rejection |
Better than 5dB |
RF Switching Bandwidth |
Equal to Sub band allocation |
Receiver Front
End BW |
Equal to Sub band allocation |
Receiver Audio
Power |
1 Watt. |
ANCILLARIES and FEATURES summary
- Very Low current consumption
- No need for receiver duty cycling
- System Interface
- Fully Programmable / Configurable via PC or serial device
- System independent, no additional software program required
- High Speed CTCSS, Full Duplex DCS/DPL
- Remote controllable Multi tone CTCSS community decoder
- 100% full power duty cycle
- 5 Tone signaling
- High Accuracy Real Time Clock.
- Multi staged TX VF processing with triple limiters
- Flash Firmware Upgrade Capable
- Battery backup system option
- Built In Test Equipment (B.I.T.E.) and remote diagnostics
- Broad Band High Efficiency LDMOS PA module
- RX & TX Switching BW covers full sub band
- Fast Serial Data Interface
- Full Digital alignment and calibration
- Field interchangeable PA module needs no re-alignment
- Pre calibrated power and deviation alignment. Digital value
- Low RFI and EMI emission design
- Controlled TX RF envelope
- DTMF decoder
- DTMF Remote control
- Latest technology, full SMD
- Advanced and optimized RF design
- High performance 16 bit Flash processor
- Programmable 12.5/25kHz channel spacing
- Configurable Function Front Panel LEDs
- Low current LEDs with digital intensity control
- Simple and fast disassembly for service
- Precision internal shielding system
- Minimal technician adjustments for future maintenance
- Design spec –40 to 70 degrees C
- Low aging oscillators
- Universal microphone input circuit
- Minimal interconnections
- Options cans be easily retrofitted
- Minimal mechanical adjustments
- Front end RX filter never needs realignment
- Built in TX modulation alignment audio oscillator
- Built in auto alignment software guides technician
- Fast and simple disassembly
- Built on proven technology
- Configuration password protected
- Virtual elimination of internal wiring
- Elimination of helical filters, quadrature coils, MCF matching
and trim potentiometers
OPTIONS
- Desk Mic
- Internal Simplex relay
- Virtual PC Console including ANI / CTCSS / DCS / 5TONE /
DTMF display (future proposed)
- Solar panel and battery power management system option board.
- Universal system interface
NOTES:
- Not all items and features initially available.
- Future software releases and features can
be Flash Memory upgraded.
- Due to ongoing development we reserve the right
to alter specifications without notice.
|