[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: Tesla Receiver Coil ..........success?
- To: tesla@xxxxxxxxxx
- Subject: Re: Tesla Receiver Coil ..........success?
- From: "Tesla list" <tesla@xxxxxxxxxx>
- Date: Wed, 02 Nov 2005 08:43:46 -0700
- Delivered-to: email@example.com
- Delivered-to: firstname.lastname@example.org
- Old-return-path: <email@example.com>
- Resent-date: Wed, 2 Nov 2005 08:45:50 -0700 (MST)
- Resent-from: tesla@xxxxxxxxxx
- Resent-message-id: <NQKNWD.A.6K.i8NaDB@poodle>
- Resent-sender: tesla-request@xxxxxxxxxx
Original poster: Ed Phillips <evp@xxxxxxxxxxx>
"Thanks for the detailed description of your beacon, that's exactly
what I was looking for. I'm planning to build a Part 15 compliant
beacon myself and am wondering if you could share the circuit diagram
and parts layout. In addition to a Part 15 radio beacon I also plan
to build a Part 15 compliant Tesla coil transmitter that uses a
nearly identical driver circuit. Both transmitters will be designed
to operate on the precisely the same frequency, around 165 kHz. The
radio antenna is to be a 49-foot tall vertical (including tophat
radius) with an 8-foot high counterpoise, as large in diameter as
possible (on the order of 150 feet). The loading coil is to have an
aspect ratio of about 1:1 and be wound with AWG 22. A variometer
will be used for tuning. AWG 22 will also be used for the TC
I like that counterpoise! Where can you find the space for
it? I'll try to dig out the schematic. If that fails I'll trace
the circuit by hand but I'm pretty lazy so that will take a while.
The transmitter is solid state . . . Uses a crystal oscillator at
32 x the output frequency, a CD4024 divide by 32 circuit, a CD4007
buffer amplifier driving four Siliconix VN66AF "power" fets.
"Am I correct in understanding that the four VN66AFs are connected
Yes they are [with ferrite beads on drain and gate to suppress
VJF oscillations) but there are a lot better FET's to use now;
remember this was over 25 years ago.
"Not sure if I answered all of your questions, and probably
none to your satisfaction. . . .On the contrary, your insights are tremendous."
I just dug out of my files all but the first two pages of a 22
page set of notes I put together when we were putting out those
kits and trying to get guys on the air; includes schematics and
suggested coil winding details. Too much stuff to scan but I could
probably copy it for you sometime and send the package to
you. Give me your mailing address and I'll try to work up the
ambition. All I have to do is remember how to make two-sided
copies as I'm too cheap to pay postage on 20 pages when 10 can hold
all the dope. By the way, this was so long ago that you could get
new crystals in FT-243 holders from Jan Crystals for only $1.50 each!