Think, "One-to-one isolation transformer."

Regards,
John

but with isolation transformers - the primary and secondary windings are
**not** physically connected (hence 'isolation' transformer). Maybe call it
a 1-to-1 autotransformer. (with a choke). :-)

"John Smith" wrote in message
...
Think, "One-to-one isolation transformer."

Regards,
John

You are thinking power xfrmr, where an isolation xfrmr is isolating from
ground loops, or possibly even dc.
A 1:1 unun is isolating from rf, the "choke" is implied!

Regards,
John

"John Smith" wrote in message
...
You are thinking power xfrmr, where an isolation xfrmr is isolating from
ground loops, or possibly even dc.
A 1:1 unun is isolating from rf, the "choke" is implied!


we-yell ah reckon the only time I ever heard of - or seen one of dem-there
isolation transformers was in the context of power xfmrs. They were usually
shielded as well. The applications were usually 'computer-rooms'.

Wonder if we could use a 240 primary to 120v secondary as a 4-to-1 balun ?

Hey, you could, but "220v-110v HF power transformers" are rare... unless you
buy "Baluns", or, "RF Auto-Transformers" (I made up that name grin) then
they are plentiful!!!!

Regards,
John

"John Smith" wrote
Think, "One-to-one isolation transformer."

============================

If it was a fixed 1-to-1 transformer and one end was terminated with
Zx, then the input impedance at the other end would also be fixed at
Zx.

But it isn't!

By no stretch of the imagination is it a fixed voltage or current
transformer of any sort.

By the way, a "Longitudinal current" is that which flows along the
feedline when both wires are considered to be one wire. ie., when
the wires are effectively connected in parallel with each other. It
is that current which is measured by a clamp-on ammeter when clamped
around both wires. The two wires can be coaxial or balanced-twin or
open-wires. I've temporarily forgotten what US citizens call it.
----
Reg, G4FGQ.

LOL!!! I will concede to your argument Reg!!!
But, "It sure seems to work like one!!!!" tongue-in-cheek,
and-only-now-and-then-sticking-between-the-lips

grin
Warmest regards,
John

Reg Edwards wrote:
If it was a fixed 1-to-1 transformer and one end was terminated with
Zx, then the input impedance at the other end would also be fixed at
Zx. But it isn't!

It is for cases where Zx = Z0. The impedance seen looking
into my no-tuner feedline system is between 32+j0 ohms and
80+j0 ohms on all HF bands. On a couple of HF bands the
measured SWR is 1:1 and of course, under those conditions,
the impedance at both ends of the 1:1 balun/choke is fixed
at Zx = Z0 = 50 ohms.
--
73, Cecil http://www.qsl.net/w5dxp

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