Gyrator 24 MHz Receiver
The GYRATOR lll receiver was assembled per the instructions on the AAVSO web site . Get the pc board from FAR circuits, makes life a lot easier.
ANTENNA'S
Install the LOOP antenna and the Whip antenna outside lway from the buildings and power lines. Align the LOOP antenna with NAA in Cutler, Maine for 24 khz operation.
Run cables inside with the LOOP going to the GYRATOR IIl and the whip to the JOVE.
CALIBRATION AND OPERATION
Turn everything on, JOVE, amplifier, GYRATOR IIl, computer, and let them warm up.
Start DATAQ WinDaq 194 program.
Click View,Format Screen, 2Waveforms.
Click Edit,Sample Rate. Input 100 for sample rate.
Click OK.
On the JOVE system adjust the Rectifier-Integrator pot to full counter clockwise..
Set JOVE volume control at 10 o'clock. Tuning at 12 o'clock.
Adjust the mini amplifier volume control so there is about 3.5 volts on channel 1.
On the GYRATOR IIl system set the 10K tuning pot all the way clockwise, and the 50K gain pot all the way counter clockwise. Adjust the tuning pot slowly counter clockwise, until a voltage increase can be seen on channel 2.
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Adjust the pot slowly back and forth until the maximum output is obtained, this should be about 5.5 volts to 6 volts. It is now tuned to 24 khz. Turn the 50K gain pot clockwise until there is about 3.5 volts on channel 2.
Click Scaling, Limits. Input channel 1 top limit at 6, and bottom limit at 0.
Click next. Input channel 2 top limit at 6, and bottom limit at 0.
Click OK.
Click Options, scroll mode.
Click edit, Sample Rate. Input 1 for sample rate.
Click OK.
Click File, Save Default Setup.
Click File, Record. Input file name.
Click Open.
The file size can be adjusted for a longer or shorter run at this time.
Click OK.
ENJOY