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G0FTD > COIL 13.04.09 10:57l 23 Lines 705 Bytes #999 (0) @ WW
BID : 000735102PZT
Read: GUEST
Subj: Making coils.
Path: IZ3LSV<IK2XDE<DB0RES<DK0WUE<7M3TJZ<ZL2BAU<GB7PZT
Sent: 090413/0727Z @:GB7PZT.#24.GBR.EU [Kidderminster] #:73500 XSERV410h
Date: Mon, 13 Apr 2009 08:27:30 +0000
From: g0ftd@gb7pzt.#24.gbr.eu (Andy)
To: coil@ww
Subject: Making coils.
Whilst on the subject of making coils, I seem to remember a long time ago that the
best way to make a tuned circuit was:
*Use 1pf for every meter of wavelength desired, and add the required inductance to suit.*
Example for 20m, this would be 20pf plus 6uH.
I don't know the origin of this rule, but I did investigate it whilst building ATU's
and notch filters.
Indeed it seemed to produce a more constant Q and depth of notch when this rule
was followed (measured with a vector network analyser).
Consequently, I have adopted this rule for all my tuned circuits.
- Andy -
G0FTD @ GB7PZT
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