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Spectra Eng. MX920 Tekrarlayıcı Telsiz

 

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Spectra
Engineering Tekrarlayıcı Telsiz

MX920 Base Station & Repeater

Low Power Consumption

The MX920 is ideally suited for remote repeater locations that are powered from Solar Panels. Current consumption is very low at 230mA typical when receiving a signal or in standby mode. Low current consumption of the MX920 receiver and main controller is achieved by using low power components while at the same time retaining the full RF specifications and performance. Current consumption during transmit is also 20% lower than previous technologies.
M920

Low Power Consumption
The MX920 is ideally suited for remote repeater locations that are powered from Solar Panels. Current consumption is very low at 230mA typical when receiving a signal or in standby mode. Low current consumption of the MX920 receiver and main controller is achieved by using low power components while at the same time retaining the full RF specifications and performance. Current consumption during transmit is also 20% lower than previous technologies.

Advanced Programming Capabilities
The MX920 can be easily re-configured using a built in terminal emulation menu system. It also provides a Technician with diagnostic and alignment tools.

Elimination of Hardware Setup
For dedicated Basestation and Repeater installations, the MX920 automatically selects the required hardware circuits for simplified operation. All manual settings and adjustments are done through software control without the need for any covers to be removed.

Self-Monitor and Diagnostic Capability
The MX920 incorporates Built In Test Equipment (BITE) as standard, so as avoiding the need for any external costly monitoring units. The built in Forward and Reflected RF Wattmeter is as accurate as most modern Test Equipment.

Power Supply System
By adhering to the 13.8V DC industry standard, the MX920 retains the benefits of simplicity, efficiency and low cost of ownership. Inferior 28V designs suffer from reduced Transmitter VSWR rudgeness and the added cost and inefficiency of DC to DC converters.

Complete Remote Accessibility
Comprehensive remote control and diagnostics is available via the high speed serial port.

Wide Band Technology
Spectra Engineering's designs feature the widest bandwidth in the industry. Previously, the RF Power Amplifier in a Transmitter restricted the available full power Bandwidth. New technology now changes those rules with new generation Power Amplifiers exceeding 80MHz Bandwidth whilst attaining even greater levels of efficiency.

Rugged Performance
The MX920 is designed and built without compromise to exceed industry standards and all international specifications. Is also capable of withstanding extreme temperature conditions and is engineered for maximum reliability. A compact yet efficient heatsinking system maintains the highest possible levels of service in adverse environments. Other inferior designs vent hot air through internal sections exposing core components to increased temperatures. The MX920 solves these problems and others by passing all hot air along the outside of the chassis and away from neighboring equipment.

Internal Modular Design
By cutting the number of module assemblies to just two, and greatly simplifying the construction techniques, a cost saving is passed to the end user. The MX920 incorporates automatic Plug n Play changeover of these modules. Being purpose designed and built from the very start, servicing is a breeze with the flat internal layout. By only removing the cover plates, even while in situ, one can access every component within the MX920 while still operating and fully connected.



Genel Özellikler

Feature
MX920
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% or optional AC mains input
DC Power Consumption <250 mA receive, typ 230mA
<10A for 50W TX RF, typ 7.8A
Operating Temperature -30 to +60C
Physical Size 120mm Height x 355mm Width
Standard LED indicators Power, RX, TX, Tone, Alert, Repeater
Standard Switches Repeater ON/OFF, Accessory ON/OFF
Standard Controls Volume, Squelch
Interface Front panel Microphone accessory socket.
Weight 8kg to 15kg depending on options

Verici Özellikleri

Transmitter Feature
MX920
RF Power Output 1W to 50W
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 46dB (WB).
Better than 42dB (NB).
Spurii 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 <10mS with continuous VCO selected
<200mS with VCO in cold standby

Alıcı Özellikleri

Receiver Feature
MX920
Sensitivity Better than -117dBm for 12dB SINAD, typ -120dBm
Selectivity 135-520MHz More than 85dB for 25kHz adj channel.
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 80dB
Intermodulation Immunity Better than 80dB
Blocking Better than 100dB at +/- 1MHz point
Distortion Less than 3% @ 60% deviation
Frequency Stability 1.5PPM for -10 to 60C,
2.5PPM for -30 to -10C
S/N Ratio Better than 46dB (WB)
Better than 40dB (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 3 Watts nominal, 5 Watts peak

Frekans Bandı

Base Model
Nom. Band
RX Frequency
EX-Limit Low
RX Frequency
EX-Limit Hi
TX Frequency
EX-Limit Low
TX Frequency
EX-Limit Hi
MX920D3
148-174 MHz
145 MHz*
178 MHz
132 MHz
180 MHz
MX920L3
350-385 MHz
335 MHz
390 MHz
325 MHz
408 MHz
MX920N2
400-435 MHz
380 MHz
445 MHz
380 MHz
445 MHz
MX920O2
435-470 MHz
420 MHz
480 MHz
420 MHz
485 MHz
MX920P2
450-485 MHz
440 MHz
500 MHz
450 MHz
500 MHz
MX920Q
485-520 MHz
475 MHz
530 MHz
460 MHz
520 MHz

»
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©2007 Tekser Elektronik Sistemler Tic. Ltd. Şti.
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