- Inspire vlf receiver schematic download#
- Inspire vlf receiver schematic windows#
SARA members who wish their projects linked from this page should email the webmaster, indicating the URL and project details.WR-3 Natural VLF Radio Receiver Info. To enable you to return here, you may wish to open these links in a separate browser. The Society of Amateur Radio Astronomers is not responsible for material hosted on other individual's or organization's websites, but links to them as a courtesy. Webmaster's Note: Some of the above links will take you off the SARA website. (Cap Hossfield, AAVSO, Vol 58, No 7, July, 2002) Some point the loop will peak the 2nd DMM output of the Gyrator II.įigure 5, Wien-Bridge schematic and parts list Use the 1st DMM to measure capacitors, AS YOU ADD nano Farad capacitors, to get the 27.7kHz loop to tune to the 25.2kHz Gyrator II (we added ~ 40 nfd) capacitors attached to both ends of the hexagon loop.With the 2nd DMM set to the DC output of the Gyrator II, now set the WB oscillator (tuned to 25.2kHz) and it's loop close to the hexagon loop and turn it on and watch the response of the Gyrator II as it records the.
(It may be preferable to tune the coil-capacitor without the Gyrator in this step.)
Now we hooked the Gryator II to the hexagon loop, and kept the 2nd DMM measuring voltages at tbe back of the Gyrator II. (We set the gain on the Gyrator II to about half.) When the DMM peaked, around 4.56 volts, we marked this setting, as it should be the Gyrator's 25.2kHz setting. no loop, just plug the oscillator right into the F connector at the back of the Gyrator, and tuned the Gyrator II. We then hooked up the Gyrator II directly to the Wien-Bridge, i.e. Then put the WB and it's loop close to the hexagon and adjusted the capacitance of the hexagon loop to cause the resonantįrequency to occur at the frequency of interest. Now we re-tuned the Wien-bridge to 25.2kHz, or the station of interest, using the 2nd DMM. This indicated the 'natural' frequency of the hexagon loop or the resonant frequency of the coil-capacitor combination. We then attached the Wien-bridge to the second DMM to measure its frequency, which read about 27.7kHz. WB peaked the AC voltage, we had a good starting estimate of the correct capacitance for the 24-turn hexagon loop. Next, set the Wien-bridge oscillator and it's small copper loop close to the hexagon loop and slowly tuned the WB oscillator until there was a peak in the AC voltage of the first DMM at the hexagon loop. We could either specify an arbitrary value of capacitance or get closer by calculating the inductance of the coil and then calculating the approximate capacitance, using the ARRL handbook. We then add some value of capacitance and tried to create a resonant circuit and get a peak in the AC voltage. We connected the 1st DMM to the hexagon loop between the start and ending of the loop, which terminate in the center circle, and set the DMM (Digital Multi Meter) to measure AC voltage. Just using two DMMs, and a Wien-Bridge oscillator, (built fromĬap Hossfield's instructions in the Solar Bulletin, Vol. This is how a friend and I tuned the1.5 meter hexagon loop This is the 1.5 meter hexagon loop, using 24 turns of #18 gauge braided copper wire. Here in Fort Collins, Colorado, at least 600 miles away. The Gyrator II and the loop antenna (described below)Īre tuned to 25.2kHz, the VLF transmitter in North Dakota. Make graphs and plots that look similar to the Rustrack recordings.Īll the output from the Gyrator II is presently being captured in Inspire vlf receiver schematic windows#
Writes to flat ASCII file format under a Windows 95 operating system, and Iīring these daily data files into an Excel spreadsheet. I capture data on a daily basis at 3 second intervals.
Inspire vlf receiver schematic download#
(Click on thumbnail to download full-size image)įigure 1.1 Art Stokes photo of the Gyrator IIįigure 1.2 Schematic of Art Stoke's Gyrator II It easier to tune the receiver, and adjust the gain.įigure 1 Digital Multi-Meter, Panasonic 486 Laptop, Gyrator II
I made a few modifications to Art'sĭesign: I'm using two 10 turn pots as gain and tuning control, this makes The power supply in the Gyrator II is a split transformer, as All the other parts I foundĪt Radio Shack, including their Digital Multi-Meter, which I use to record He sent me the electrolyticĬapacitors that I couldn't find anywhere else. I built the Gyrator II (on the right in the photo below) a couple yearsĪgo, when Art Stokes was still alive. By Rodney Howe, email ahowe at frii dot com
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