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VINTAGE VLF RECEIVERS A COLLECTIVE PROFILE by Harold A. Layer AV -SF State U. 1600 Holloway Ave. San Francisco, CA 94132 This third edition of my directory attempts to list every vacuum tube radio receiver ever built that could tune within the bands of 3 -30 kHz or even 3 -3000 Hz. Radio began in the longwave sectrum and the SRR1 - Schumann Resonance Receiver The original inspiration for this receiver was a high impedance buffer designed by Scott Fusare and published in "The Lowdown" (see the article here ). The current design incorporates a number of changes that lower the frequency response down to the ULF-ELF range. This antenna was constructed to use with a Dymec DY-5842 VLF Receiver, primarily to receive WWVB on 60kHz. The Dymec optional shielded loop antenna was built as a 4 foot diameter circle with 50 feet of cable attached. The nominal inductance of the Dymec loop antenna is specified as 1.43mH and it has no tuning capacitor of its own -- tuning is done with switched and variable capacitors inside the DY-5842. work with any receiver with a ferrite bar antenna that covers LW. This is the standard 14 inch and will provide very acceptable results depending on your receiver and location,etc…see the pdf…not to say it will do LWBC (your location,rx etc.) but everything else. (The reason for 155 not 150 is the variable tuning capacitor Paul See full list on detectingschool.com The coil and capacitor would both attach to the antenna, but only the coil would go to the receiver's antenna terminal. If this still doesn't help for VLF, I would add another 500 or 1000 pF fixed capacitor in parallel with the 500 pF variable.

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we do not use any alternative equipment, technology, or converted satellite systems in our products. our systems are designed and built specifically for radio astronomy research and applications only! Some time ago, I was experimenting with a home-brew VHF receiver for use with weak-signal over-the-horizon voice and satellite communications. Out of that project, came a number of small projects that I have since found to be very useful for my other amateur radio interests.

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Nov 30, 2013 · 5 thoughts on “ Regenerative Receiver from 1950 Boys Life Magazine ” Jon September 7, 2014 at 4:58 pm. Hi Richard. At the Brimfield Antique Show in Brimfield, MA several days ago, I found and bought a built up 6SN7 regen receiver. I thought it was the 1950 ARRL version until I noticed a variation. A little Goggling got me here to your blog. 88-108MHz FM Radio Kit FM Radio DIY Radio Receiver Fully Discrete Unfinished new. Brand New. C $27.92. Top Rated Seller Top Rated Seller. Buy It Now. From China. Free ... RF field intensity meters include a category of devices known as very low frequency (VLF) receivers.A VLF receiver detects a radio frequency between 3 and 30 KHz. Submarines use VLF receivers for communication purposes when they are near...

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DIY Sensitive VLF METAL DETECTOR With Smartphone (detects a Small Metal Coin at 25 Cm and Pot Lid at 1m Distance): This metal detector is capable of detecting small metal objects at great distances. For example, a small metal coin or gold ring can be found at a distance of up to 25 cm. And the best part is that it is very simple and can be made by anyone who has… MFJ-805 RFI/Noise Detector, meter. Use this ultra-sensitive pocket-sized RFI Detector to track down and eliminates RFI caused by radiating cables and wires. itll tell you exactly which cable is radiating RFI so you can eliminate it with a simple toroid or clamp-on RFI filter.