Home | About Us | Contact Us    
Addlestone Electronics
Home > Longitudinal Hum Rejection > HUM REJECTION UNIT WITH EQUALISATION (BH 132)

HUM REJECTION UNIT WITH EQUALISATION (BH 132)

bh132With 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.

Contact us about this product

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 email us, quoting part number BH132.