SCD 5 CARRIER-CURRENT DETECTOR The battery powered SCD5 detects VLF (10 KHz to 700 KHz) carrier-current signals on AC power or telephone lines.   The unit is supplied with detector/amplifier assembly, AC input cable (input protected to 400 volts DC or 50/60 Hz AC) a headset and a spare connector (Radio Shack P/N 274-001A - pins 1 and 2 are the input pins and are not polarity sensitive) and adapters for use with telephone, cable TV and TV wires. TO OPERATE:   Connect the appropriate cable to the input jack.  Insert the headset.   Set the band selector switch to the 100-700 KHz range.   Set the RF GAIN and TUNING controls at 12 o'clock.   Turn the SCD5 on by rotating the VOLUME control slightly clockwise.   The red PWR (power) indicator will light.  Advance this control until a slight background hiss is heard.  Slowly rotate the TUNING control through the 100 to 700 KHZ range, i.e. LO to HI or visa verse.   If a signal is detected, the unit will lock at several points on the dial.  Once locked, turn the VOLUME control farther clockwise and listen to the signal.   Use the same procedure to listen through the 10 KHz to 100 KHz band.  Note that power companies transmit metering data below 100 KHz which may appear as a steady tone or a series of rapid pulses. Remember to turn the unit OFF when tests are complete! Under some conditions it may be necessary to increase or decrease the setting of the RF GAIN control.   Operating experience will determine the best position for this control. The SCD5 is powered by two 9 volt ALKALINE batteries.  Zinc-carbon batteries can not supply enough current to run the SCD5 for any length of time.   They may be briefly used if Alkaline batteries are not available. To replace the batteries, loosen the cover screws on the sides of the unit one or two turns counterclockwise.  Carefully remove the back cover.  Note the position of the batteries.   Remove the old batteries and discard in a responsible manner. Replace with fresh ones (in the same position).  Replace the cover and tighten the cover screws (don't over-tighten). As with any piece of battery operated equipment, remove the batteries during periods of prolonged storage. Complete electronic countermeasure (ECM) system includes AVCOM PSA65-C, SCD-5 Carrier Current Detector, AV/SC-59 switch matrix, VM-515 10.7 MHz video demodulator, RAS-515 Raster Analysis System and oscilloscope showing demodulated video.