You might try heating the bend really hot with a torch and then letting
it cool slowly. Assuming that it's being work hardened, that should
anneal it and make it more like the copper was originally.
On 8/13/25 22:25, Richard Bonica via BVARC wrote:
Ok.. With that said, is there a way to bend without changing the
resistance? This sounds like the most plausible scenario.
Richard Bonica
C: 281.935.7222
Email: [email protected]
Freq: 147.000 - DMR - Digital Mobile
Territory: NE Fort Bend
CERT, CST, EST, WEB EOC, HSEEP, FEMA PD, Wilderness First Aid, CPR,
Extra Ameture Radio
On Wed, Aug 13, 2025, 9:17 PM Daniel Poirot <[email protected]> wrote:
Does this affect the Velocity Factor that you see on the calculators?
Dan KJ5IZK
On Wed, Aug 13, 2025 at 6:42 PM Jay Davidson via BVARC
<[email protected]> wrote:
>From an engineering perspective my first guess would be “skin
effect” and some phase shift. By bending it you’re causing
irregularities and introducing resistance.
Conductors all have different skin depths and it changes with
frequency and how the eddy currents affect the cross section.
Basically as frequency goes up the depth gets shallower.
73,
Jay
Sent from my iPhone
On Aug 13, 2025, at 4:54 PM, Richard Bonica via BVARC
<[email protected]> wrote:
To All,
I am working on a Dual Band J Pole. What I am wondering is
the following...
if I use 90degree copper connectors and pipe, I get a nice
clear signal and an SWR of like 1.4
If I use a pipe bender, that all goes out the window. The SWR
stays the basic 1.2 - 1.5 but the actual audio has a weird
pop and the signal loses a lot of strength.
Anyone have a clue why the nice neat bends make the signal
sound like garbage? Do I need to really use the ugly joints?
--
Richard Bonica
C: 281.935.7222
Email: [email protected]
Freq: 147.000 - DMR - Digital Mobile
Territory: NE Fort Bend
CERT, CST, EST, WEB EOC, HSEEP, FEMA PD, Wilderness First
Aid, CPR, Extra Ameture Radio
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