[Elecraft] winding torroids

Mon Dec 29 20:21:00 2003

I notice that even when I pull the wire tight during soldering the core =
is still slightly loose. And even if the core is not loose, in a mobile =
environment the wires will continuously wiggle. So, the wires could =
fatigue over time. I see two types of adhesive used extensively in =
electronics these days. Electronic grade RTV and hot melt glue. I'm =
wondering if low temp hot melt might work for securing the toroid cores. =
I would avoid hard materials such as epoxy as these tend to compress the =
cores during cold conditions- I have seen the inductance of a ferrite =
cord decrease by a factor of five when a core potted in epoxy was cooled =
only 50 degrees C. I wonder if the hot melt is also two hard? I =
anxiously await your comments, pro and con.

   Dave WX7G

-----Original Message-----
From: [email protected]
[mailto:[email protected]]On Behalf Of [email protected]
Sent: Monday, December 29, 2003 5:15 PM
To: [email protected]; [email protected]; [email protected]
Subject: Re: [Elecraft] winding torroids

David:

I have to agree with Bob, N6WG.  If wound properly (that is, with
patience), the windings will be very stable physically.  Q-dope is
most useful in toroids (not in the K2) that utilize very small-gauge
wire and might tend to loosen.  Hakuna Matata.

73,

Bob  WA4FOM

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