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- Path: sparky!uunet!elroy.jpl.nasa.gov!swrinde!mips!apple!apple!netcomsv!mork!nagle
- From: nagle@netcom.com (John Nagle)
- Newsgroups: sci.electronics
- Subject: Re: How can I make RF-coils
- Message-ID: <j2mmwt_.nagle@netcom.com>
- Date: 28 Jul 92 18:11:51 GMT
- References: <1992Jul26.152358.19613@htsa.aha.nl>
- Organization: Netcom - Online Communication Services (408 241-9760 guest)
- Lines: 31
-
- tsjoit@htsa.aha.nl (T. H. Tsim) writes:
-
-
- >
- >Hi! Dear netters !
- >
- >In order to construct a RF-mixer oscillator, I need some info concerning
- >RF inductivity-coils. You know, those small copper cans, which contains a
- >plastic winding body and a turnable ferrit core.
- >
- >Could someone please tell me how to design such a device ? What kind of
- >calculations should be made on diameter, wire thickness, ferrit length etc etc
-
- See chapter 4, "Winding your own coils", in "Secrets of RF Circuit
- Design", by Joseph J. Carr. (1991, TAB (blech) Books, ISBN 0-8306-3710-9).
- Like most TAB books, this is a marginally useful work; despite the title
- much of the content is devoted to such subjects as a history of spark
- gap transmitters (with diagrams and photos) and techniques for refurbishing
- old ham gear. But it does have a useful chapter on do-it-yourself coil
- making.
-
- But why bother? Between Coilcraft and Toko, you can get coils for
- almost any receiver application for a dollar or two each. The minimum
- order quantities can be a problem, but Coilcraft has some designer's kits
- with a few of each value for each type of coil they make. These run
- $50-60, and if you use up all of one kind, they'll restock your kit free
- if you ask. Coilcraft is at 708-639-6400. I've found them very helpful.
-
- John Nagle
-
- John Nagle
-