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MULTI ACCESS RURAL RADIO
MARR consists of a Base Station Unit (BSU) connected to
the network through trunk lines, and the remotes are
provided in the remote locations. The remotes (RSU) can be
as far away as 45 Kms clear line of sight.
PRODUCT DESCRIPTION
 
Typically 20 locations can
share 8 Radio Channels or 4 channels can be shared by 36
channels
Is an ideal equipment for connecting different location on
shared Radio channel basis
Equipment Works on VHF/UHF Band.
This has been extensively used to provide rural
communication links for connecting Rural communities to
the PSTN. Equipment is transparent to any
signaling/dialing plans and usually is set for CCITT type
5 MFR2 signalling.
At BSU an omni directional antenna is used
At RSU end a yagi antenna is used.
Features
Broadcast messages from any RSU through the base station.
Group call facility from BSU or any RSU.
Dialing plans & interfaces.
230V AC compatible.
Extension of range through suitable repeaters.
Pre-defined call duration setting.
Compatibility with DTMF & Pulse dialing.
Monitoring of RSU status from BSU station.
Extension of subscribers up to 120.
Application
Private networks
Remote Hilly Areas /Sites where in Laying Cables is a
constraint .
Mechanical
Dimension
Base Station Unit (BSU) – Rack Ht - 3 Ft Antenna – Omni
Directional 15 feet Tower – as required
Remote Station (RSU) (L X B X H) = 320 X 95 X 280
Specifications
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No of Radio Channels |
4/8 |
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No of Remote Subscribers |
20/40/90/120 |
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Frequency Range |
VHF / UHF |
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Tx-Rx separation |
25 MHz |
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Type of Modulation |
FM |
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S/N ratio at 1Khz over a single hop
for 10 micro-volt RF signal input |
50 db Min |
Transmitter Specifications
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Power at Antenna port |
2 Watts (Min), 5Watts (Max) |
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Freq deviation for 1kHz tone |
3.3KHz + 0.3 KHz a level of 0dbm at 2W
points |
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Maximum frequency deviation |
5KHz peak (Max) of +5dbm at 2W points |
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Signalling frequency deviation |
a. 125/3825 Hz Tone : 1.3 KHz + 0.3 KHz
(max)
b: DTMF Tone : 2.5 KHz + 0.6 Khz |
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Frequency stability of carrier |
5 ppm or better |
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Spurious |
25 Microwatts |
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Protection |
Tx shall be protected against infinite VSWR
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Cooling of Transmitter |
Natural cooling |
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Output connector@ antenna |
N male |
RECEIVER SPECIFICATIONS
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Type |
Superhetrodyne |
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Intermediate frequency |
10.7 MHz and 0.455 MHz |
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Sensitivity |
a: 12dB or better SINAD for a level -107dbm
at Antenna port.
b: S/N ratio of 50dB or better for RF level of –87dbm at Antenna
port. |
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Image Rejection |
80dB or better |
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Selectivity at + 25KHz from Rx freq
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60dB or better |
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Squelch |
-116 dBm +3 dBm |
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Hysteresis |
2 + 1 dBm |
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LO frequency stability |
5 ppm or better |
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Input Connector |
SMA female |
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Overload point of Receiver |
-20 dBm or better |
Get in touch with us if you require more information about MARR
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