Posted by
Ron D'Eau Claire-2 on
Jun 01, 2006; 4:27pm
URL: http://elecraft.85.s1.nabble.com/essential-tools-tp390414p390415.html
This discussion of good L meters brings up an issue regarding Elecraft rigs
that probably bears repeating.
When building an Elecraft kit, do *not* try to trim the inductances to meet
the value shown in the manual. Simply wind the toroids with exactly the
number of turns called for and position the wires as shown in the
illustrations.
It doesn't hurt to measure the inductance if you want to, but don't panic if
the values don't match the manual and don't try to adjust the coil to make
them match. The numbers in the manuals are simply nominal values and may not
be the optimum value for your particular rig. Where the actual value is
critical, it is adjusted as needed to make the circuit behave properly, not
by adjusting the coil to meet some predetermined inductance. The PLL
reference oscillator coil in the K2 is one such example, where you may
adjust the coil slightly to obtain the proper voltage range. The KX1 output
filter coils are another, where you may adjust the position of the turns for
proper output on all bands.
Where such tests are not a part of the build procedure, the inductance is
not that critical. Just be sure to wind the coil exactly as shown.
Ron AC7AC
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