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Video balun receptor: TRO-4/400 - SOLDURI!
Cod: M1670
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Ceiling Dome Camera CAM 082 (420TVL, Sharp, 0.5 lx, 3.6mm)
View of the device

Ceiling Dome Camera CAM 082 (420TVL, Sharp, 0.5 lx, 3.6mm)
Front view

TRO-4/400 is designed to power CCTV cameras with DC voltage and receive video signals from four TRN-1/400 video transmitters M1668, via a twisted pair cable (UTP, FTP), over distances up to 400 meters. The device is fed with 24-29 VAC coming from an external AC power supply.
The camera signal provided to one of TRN-1/400 transmitters ( M1668) is sent via a twisted pair cable to the TRO-4/400 receiver. This way the transmitter matches the impedance of 75 ohm coaxial cable to that of the outgoing twisted pair, which allows transmission of the video signal over longer distances (up to 400 meters). The receiver performs the reverse operation.
The TRO-4/400 receiver feeds the twisted pair cable with unstable DC voltage (max 40V) which is later stabilized at the level of 12V in the TRN-1/400 transmitter ( M1668). This allows to power four cameras equipped with heaters and thermostats.
On the assumption that the power consumption of a camera equals 250mA (12V) and that of a thermostat is 500mA (12V), e.g. TT-12E, then power can be sent with standard 0.5 mm twisted pair cable (24AWG) over the following distances:


Type of load

Max distance at AC29V

Max distance at AC24V


4 cameras with thermostats

4 x 420m



3 cameras with thermostats
+ one without

3x440m + 1x1200 m



2 cameras with thermostats
+2 without

2x480m + 2x1400 m

3x55m + 1x190m


1 camera with thermostat
+3 without

1x480m + 3x1500m

2x130m + 2x720m


4 cameras without thermostats


4x720 m

For distances greater than 400m a video amplifier should be installed.




Video bandwidth

up to 50 MHz

Nominal video loss

0.5 dB (at f = 5 MHz)

Impedance of the coaxial outputs

75 ohm

Impedance of the symmetrical inputs

100 ohm

Types of connectors

4 x BNC sockets

Types of symmetrical cable connectors

4 x RJ-45 sockets (8 pin, 4 pairs)

Power input (max parameters)

29VAC / 2A

Max. output voltage


Max. current (40VDC)



100 g


117x64x30 mm

Connection diagram: the device with 4 cameras without thermostats

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Video balun receptor: TRO-4/400 - SOLDURI!
Cod: M1670
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