Elecraft specifically warns that fixatives of any kind not be used on
toroids.
I don't know if that statement appears in the KX3 or KXPA100 documents,
but it appears in all manuals where the toroids are wound by the builder.
The toroids are adequately supported by their leads alone.
For one example, I built a K2 for an over-the-road truck driver, and I
know he used it mobile in his truck for more than 3 years. No fixatives
were used on the toroids, and no failures were experienced because of
the high vibration environment.
As another example, I repair the KX1, K1, and K2 transceivers - they are
shipped to me by either the postal system or UPS. In over 1000 repairs,
I have never found any case where the toroid leads have been broken.
Fixatives are not necessary, and I believe using them in the KX3 or
KXPA100 will void your warranty.
Many fixatives will change the inductance and Q of the toroids.
73,
Don W3FPR
On 7/27/2014 6:10 AM, Rooby wrote:
Hello
I saw that on the KX3 and KXPA100 none of the toriods are fixed or glued to
the PCB.
Is there a reason why this was not done by eleraft? Because After some time
the wire will brake if the toroids vibrate especially when transporting the
KX3. Normally they should be fxed. I don't think the inductance will change
much if they will be fixed with a small dop of glue.
Has someone done this already or will elecraft do this in the future?
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