Michael N9BDF wrote:
I know that this issue comes up from time to time. I ran across this
comparison of materials on the Web and thought some might find it useful.
www.qrp.pops.net/w7el.htm
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Interesting info!
The Elecraft kits are designed to avoid the need to attach the toroids to
the PCB with any sort of material other than the leads themselves. Doing so
may disturb the properties of the coil and reduce performance or cause the
unit failure altogether.
The kits are also designed so that the leads from the toroids will drop in
to the proper pads *if* they are wound exactly as shown in the manuals
(turns going in the directions shown, spaced as shown, and so on).
In some cases it is essential the windings be positioned exactly as shown
for the unit to work. In the KXB3080, for example, two inductors consist of
a pair of windings side-by-side on a single toroidal core. On 80 meters a
relay connects the windings together to form a larger inductance. If those
windings are not wound as shown in the drawings and photographs, the
inductances may not add causing the rig to fail to operate.
Often there's a lot more to a coil than what meets the casual eye. That's
why there are so many pictures showing them wound exactly as they need to be
in the manuals.
Ron AC7AC
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