5 to 500 KHz VLF Converter

The VLF59-2 is an up-converter that moves 5KHz- 500KHz to 2.005MHz-2.500MHz.  Although specifically designed for use with the Avcom PSA 65x series of spectrum analyzers it works well with any receiver that can cover its frequency range.

Connect the VLF59-2 BNC to the Avcom RF INPUT jack.  The unit is supplied with two antennas that permit connection to the power line ground or telephone line.   Other antenna configurations may be used as long as the wire is isolated with a capacitor having at least a 500 volt rating.  Turn on the VLF converter and AVCOM and set the REFERENCE LEVEL switch at 0 dbm, the SPAN switch at .2 MHz/DIV and the VAR SPAN at vertical. With NO antenna connected, tune the AVCOM to 0 (Zero) MHz to locate the zero signal. Slowly tune to move the zero signal towards the LEFT side and off the screen. Continue to slowly tune and a new signal will appear from the RIGHT edge of the screen.   This signal is the 2.000 MHz local oscillator signal of the VLF59-2.  Place the peak of this signal on the LEFT hand edge of the screen. Signals from 5 KHz to 500 KHz appear to the RIGHT of the 2.000 MHz signal.  Connect an antenna. When the converter is turned OFF the ANTENNA input is connected directly to the RF INPUT of the spectrum analyzer.   Do not use the VLF59-2 with any of the AVCOM frequency extenders.

A single 9 volt Alkaline battery powers the unit.  Normal battery life is in excess of 200 hours.

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