> > HUM REJECTION UNIT WITH EQUALISATION (BH 132)

HUM REJECTION UNIT WITH EQUALISATION (BH 132)

bh132 With the BH132 inserted into the cable run the incoming coaxial cable is isolated from the outgoing coaxial cable. This is achieved using an Optocoupler in the circuitry.

The isolation this provides enables the total rejection of any longitudinal hum caused by circulating earth currents in the cable up to a maximum of 90 volts peak to peak. This prevents the appearance of Hum Bars on the video monitor.

The unit has three lift controls: Gain, High Frequency Lift and Medium Frequency Lift. Adjusting these controls enables the unit to act as a basic line corrector for use over short to medium cable runs when used in conjunction with a Launch Amplifier.

TECHNICAL	DESCRIPTION
INPUT SIGNAL REQUIREMENTS	Composite video using colour / monochrome video signals or other wide band signals within a frequency bandwidth of 30Hz to 5MHz.
INPUT SIGNAL AMPLITUDE	Nominal 1 volts peak to peak.
OUTPUT SIGNAL AMPLITUDE	Nominal 1 volt peak to peak (unbalanced) or 2 volts peak to peak (balanced)
AT UNITY GAIN	Differential Phase <3 degrees /Differential Gain <3%.
INPUT IMPEDANCE	75 ohms.
OUTPUT IMPEDANCE	75 ohms via BNC socket or 150 ohms via twisted pair
INPUT-OUTPUT CONNECTIONS	75 ohm BNC connectors for unbalanced input. 75 ohm BNC socket for unbalanced output / Binding pole terminals for balanced twisted pair output.
ELIMINATION OF LONGITUDINAL HUM	Automatic rejection to a maximum of 90 volts peak to peak
GAIN CONTROL	Adjustable between -3dB and +6dB.
FREQUENCY RESPONSE	30Hz to 8MHz flat to within ±1dB at unity gain.
AT UNITY GAIN	Differential Phase <3 degrees / Differential Gain <3%.
GAIN CONTROL	Variable from –2dB to +6dB.
HIGH FREQUENCY LIFT	Adjustable between -3dB and +6dB.
MEDIUM FREQUENCY LIFT	Adjustable between -1dB and +6dB.
OUTPUT BALANCE CONTROL	For twisted pair output only – this is factory set but may be adjusted if required.
POWER REQUIREMENTS	12 Volts DC .Two separate 12V supplies required (Supplied with unit).
POWER CONSUMPTION	Approximately 0.8 Watts.
OPERATING TEMP. RANGE	-10°C to +40°C.
WEIGHT OF EQUIPMENT	270 grams.
DIMENSIONS	Length 155 mm Height 44 mm Width 85 mm (excluding connectors )

Ordering Information:
For a quotation, further details or technical support and advice, contact us by phone on +44 (0)1483 480969, fax +44 (0)1483 797268 or , quoting part number BH132.