Dave wrote:

I've tried manipulating my twin lead cable into that configuration, to
no avail. The best I can get is something resembling a double helix. If
I leave it twisted like that, it may have genetic ramifications.

For parallel lines it's diameter v distance. Common zip cord is ca. 75
Ohms.

Now, I've always been led to believe that a ratio is a unit less
quantity. I get the feeling that some length of cable is needed here to
get an ohmic value. Perhaps something approaching infinity?


mike (easy as falling off a Log) II



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On Thu, 14 Aug 2008 22:13:34 +0000, m II wrote:

Dave wrote:

I've tried manipulating my twin lead cable into that configuration, to
no avail. The best I can get is something resembling a double helix.
If I leave it twisted like that, it may have genetic ramifications.

For parallel lines it's diameter v distance. Common zip cord is ca. 75
Ohms.

Now, I've always been led to believe that a ratio is a unit less
quantity. I get the feeling that some length of cable is needed here to
get an ohmic value. Perhaps something approaching infinity?

Characteristic Z assumes infinite length.
mike (easy as falling off a Log) II

On Thu, 14 Aug 2008 22:13:34 +0000, m II wrote:

Now, I've always been led to believe that a ratio is a unit less
quantity. I get the feeling that some length of cable is needed here to
get an ohmic value. Perhaps something approaching infinity?


http://www.allaboutcircuits.com/vol_2/chpt_14/3.html

"m II" wrote in message news:i62pk.7114$%b7.6611@edtnps82...
Dave wrote:

I've tried manipulating my twin lead cable into that configuration, to
no avail. The best I can get is something resembling a double helix. If
I leave it twisted like that, it may have genetic ramifications.

For parallel lines it's diameter v distance. Common zip cord is ca. 75
Ohms.

Now, I've always been led to believe that a ratio is a unit less
quantity. I get the feeling that some length of cable is needed here to
get an ohmic value. Perhaps something approaching infinity?


mike (easy as falling off a Log) II


Don't confuse DC Ohms with surge impedance of coaxial line- they have
nothing in common except their unit of measurement.
Speaker wire probably is a relatively low Z line- which then suffers from
two issues:

1.One reason typical amateur balanced line is low loss is because of the
high impedance.
2. The vinyl insulation of typical speaker wire is a lossy dielectric
compared to the polyethylene of balanced transmission lines. Look at the
tangent angle of vinyl vs. polyethylene or teflon.

Dale W4OP

On Aug 14, 3:13*pm, m II wrote:
Dave wrote:
I've tried manipulating my twin lead cable into that configuration, to
no avail. The best I can get is something resembling a double helix. If
I leave it twisted like that, it may have genetic ramifications.

For parallel lines it's diameter v distance. *Common zip cord is ca. 75
Ohms.

Now, I've always been led to believe that a ratio is a unit less
quantity. I get the feeling that some length of cable is needed here to
get an ohmic value.

- Perhaps something approaching infinity?
-
- mike (easy as falling off a Log) II

To Infinity and Beyond !
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