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References: [ +subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*Topband\:\s+Restistance\s+of\s+wire\s*$/: 10 ]

Total 10 documents matching your query.

1. Topband: Restistance of wire (score: 1)
Author: Martin <dm4im@t-online.de>
Date: Wed, 03 Dec 2014 14:24:52 +0100
Topbanders, i have a spool of twisted wire for military field telephone use, similar to WD1-A . It has some strands of copper and some strands of steel. I built the reflection transformer and install
/archives//html/Topband/2014-12/msg00015.html (6,700 bytes)

2. Re: Topband: Restistance of wire (score: 1)
Author: Bill Wichers <billw@waveform.net>
Date: Wed, 3 Dec 2014 15:35:13 +0000
With some quick calculations and a check of a chart of wire gauge and resistance, that 25 ohms for 400m is about 19 ohms/kft which works out to something between 22 and 23 gauge copper wire. I don't
/archives//html/Topband/2014-12/msg00016.html (8,541 bytes)

3. Re: Topband: Restistance of wire (score: 1)
Author: k1fz@myfairpoint.net
Date: Wed, 03 Dec 2014 12:05:26 -0500
The resistance sounds about right Martin. Most of the conductivity comes from the copper strands. Steel strands have high mechanical strength, but poor conductivity. I square R loss is low as signal
/archives//html/Topband/2014-12/msg00017.html (7,341 bytes)

4. Re: Topband: Restistance of wire (score: 1)
Author: "Tom W8JI" <w8ji@w8ji.com>
Date: Wed, 3 Dec 2014 14:36:30 -0500
Thinking I^2 R with low current (because of being in a small signal application) might mislead us. The absolute value of current would just tell us conductor heat, if we actually knew RF resistance
/archives//html/Topband/2014-12/msg00018.html (8,390 bytes)

5. Re: Topband: Restistance of wire (score: 1)
Author: Tim Shoppa <tshoppa@gmail.com>
Date: Wed, 3 Dec 2014 14:52:42 -0500
That would be the right ballpark. 3 paralleled strands of 29 AWG copper running for 400m would be 36 ohms. 3 paralleled strands of 30 AWG copper running for 400M would be 45 ohms. (Usually when I do
/archives//html/Topband/2014-12/msg00019.html (9,982 bytes)

6. Re: Topband: Restistance of wire (score: 1)
Author: Mike Waters <mikewate@gmail.com>
Date: Wed, 3 Dec 2014 14:20:17 -0600
One thing that would affect RF conductor resistance is the paramagnetic properties of the conductor. If, for example, it was bare iron or magnetic steel wire, then we would have eddy current losses.
/archives//html/Topband/2014-12/msg00020.html (8,495 bytes)

7. Re: Topband: Restistance of wire (score: 1)
Author: Mike Waters <mikewate@gmail.com>
Date: Wed, 3 Dec 2014 15:16:03 -0600
I didn't realize that what I mentioned was on Owen's new site. "For example, a 0.5mm diameter mild steel wire has skin depth of 0.006mm at 1.8MHz, and as explained at http://owenduffy.net/calc/SkinDe
/archives//html/Topband/2014-12/msg00023.html (9,214 bytes)

8. Re: Topband: Restistance of wire (score: 1)
Author: Martin <dm4im@t-online.de>
Date: Wed, 03 Dec 2014 23:41:36 +0100
Topbanders, thank you for your comments. Looks like this wire was a good choice (in fact, i couldn't resist as it was free), many use it for their beverages. Thank you all. Now back to the shop build
/archives//html/Topband/2014-12/msg00026.html (7,349 bytes)

9. Re: Topband: Restistance of wire (score: 1)
Author: "Tom W8JI" <w8ji@w8ji.com>
Date: Wed, 3 Dec 2014 22:48:14 -0500
One thing that would affect RF conductor resistance is the paramagnetic properties of the conductor. If, for example, it was bare iron or magnetic steel wire, then we would have eddy current losses.
/archives//html/Topband/2014-12/msg00031.html (9,784 bytes)

10. Re: Topband: Restistance of wire (score: 1)
Author: "Tom W8JI" <w8ji@w8ji.com>
Date: Wed, 3 Dec 2014 22:49:23 -0500
I would not worry too much about 40 ohms resistance in a 600 ohm impedance antenna that already has an intentional terminating resistance at the end. Although I've never modeled what happens when the
/archives//html/Topband/2014-12/msg00032.html (8,604 bytes)

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