Wire Length Estimation Chart

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From: gmd@adm01.rfc.comm.harris.com
Date: Tue Mar 29 1994 - 13:57:08 EST


Hello All -

    There has been some discussion lately on how to estimate the amount
    of wire needed to wind a coil. What follows is a table which I
    copied from QRP Quarterly of October 1992. The article was by
    Michael A. Czuhajewski (WA8MCQ). If you have been reading QRP/
    Homebrew articles for any lenght of time, you'll note that Michael's
    name is on a great many toroid/coil/inductor articles.
    
    Please note that the inches per turn values DO NOT include any extra
    for hookup to the board (i.e. you should probably add a couple inches).
    The other disclaimer is that these values are for a single layer of
    wire, so if you're building a transformer, the secondary will
    probably require more wire than is calculated from the values below).

    [Bruce (@think.com) - if someone verifies this table, is this the
     sort of thing which could be archived on QRP listserver? - gmd

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Wire Length for a variety of coil forms, taken from QRP Quarterly
October 1992 by Michael A. Czuhajewski WA8MCQ.

SIZE INCHES PER TURN SIZE INCHES PER TURN
------------------------- ------------------------
FT23 0.26 T12 0.19
FT37 0.5 T16 0.23
FT50 0.68 T20 0.29
FT50A 0.79 T25 0.37
FT50B 1.37 T30 0.47
                                      T37 0.49
FT82 0.93 T44 0.61
FT87A 1.53 T50 0.67
FT114 1.13 T68 0.8
FT114A 1.7 T80 0.92
FT140 1.73
                                      T94 1.16
FT150 1.44 T106 1.57
FT150A 2.01 T130 1.6
FT193 2.22 T157 2.02
FT193A 2.51 T184 2.66
FT240 2.3
                                      T200 2.13
                                      T200A 3.16
                                      T225 2.24
                                      T225A 3.28
                                      T300 2.39
                                                   
                                      T300A 3.54
                                      T400 3.51
                                      T400A 4.31
                                      T500 4.28

--------cut here---------------------------------------------

73, Gary N2JGU
gmd@rfc.comm.harris.com


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