[TowerTalk] Isolation Transformer

[Martin Ewing]

Gene,

Here are my 2 cents.

A transformer _can_ provide some protection against HF signals &
transients that may come in on the line, but most transformers aren't
designed for that kind of isolation.  The best ones are carefully
shielded between primary & secondary to reduce capacitive coupling.

An isolation transformer gives you the _possibility_ of having a local
AC ground reference point separate from the AC entrance.  Good
practice demands that all grounds be bonded together for safety.  The
isolated ground can be used to advantage to reduce local AC ground
currents, but that's not the usual problem for ham installations. (It
could help with low-level instrumentation or with audio studio work in
an AC noisy environment.)

An adjustable transformer gives you some ability to stabilize voltage.

In most cases, I don't see any benefit of transformer isolation for
ham use. YMMV

73, Martin AA6E
http://blog.aa6e.net


On Fri, 18 Mar 2005 20:59:59 -0500, Gene WØQFC <erastber at tampabay.rr.com> wrote:
> With all of the talk about lightning protection brought to my mind the question:  Would a isolation transformer placed between the AC mains and the shack breaker box afford any useful protection?
> I just completed the outside wiring of running the 'main' line to the shack from the house breaker panel. It was run outside the house, in PVC pipe to the outside wall of the shack and then into the shack breaker panel.
> I have a VERY large transformer that is aprox one foot square with multiple taps.....
> Any info would be greatly appreciated.
> 
> Gene, WØQFC
> Spring Hill, FL
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