Coaxial power cables are indeed used for this purpose. But I developed a
method of measuring the current in the cable without cutting it, by
measuring the magnitude of the residual magnetic field. It was taken
seriously by a research scientist, but that didn't result in further
progress, as far as I know. The reason I did this work is that hearing
loops use audio-frequency magnetic fields in the microtesla range, so I
know how to measure them. If anyone is interested in the idea, please
send me an email. It doesn't work for DC, of course, without some trickery.
On 2025-08-13 18:28, doug emcesd.com wrote:
I was thinking more as a way to deliver DC power while minimizing
nearby effects of the magnetic field usually generated by DC cables.
To address dielectric effects, I have seen both cables and capacitors
“recharge” themselves to some extent after being discharged. I have a
large (I can barely lift it) 50,000 Volt capacitor that I keep a 1
GOhm resistor across it that would discharge it over a few minutes
after my experiments if I forget to reinstall the short after using
it. The time constant is long enough not to affect my experiments
which usually only need it to be charged for a few seconds.
You can get 100MOhm to 10 GOhm UxCell brand resistors from Amazon. I
use a lot of these both for safety reasons as above and to make high
impedance circuits like oscillators. If you want to get some, here is
a link:
uxcell 1G Ohm 3W 5% Resistance...
https://www.amazon.com/dp/B005G1ZPY4?ref=ppx_pop_mob_ap_share
Doug Smith
Sent from my iPhone
IPhone: 408-858-4528
Office: 702-570-6108
Email: [email protected]
Website: http://dsmith.org
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*From:* Gert Gremmen F4LDP <[email protected]>
*Sent:* Wednesday, August 13, 2025 6:57:23 AM
*To:* [email protected] <[email protected]>
*Subject:* Re: [PSES] Shielded cables at dc
Well the theory is not that well evolved yet, but it might be
parametric storage (memory) in the dielectric (Indeed) that gets
re-triggerd once the cable is at rest. If not connected, the QRM
cannot leave the cable (SWR=infinite) and "polarizes"
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Well the theory is not that well evolved yet, but it might be
parametric storage (memory) in the dielectric (Indeed) that gets
re-triggerd once the cable is at rest. If not connected, the QRM
cannot leave the cable (SWR=infinite) and "polarizes" the
dielectricum. Rinsing it a sufficient amplitude DC will iron out the
storage, and make the cable suitable for its purpose. Everytime i
drink a beer the mechanisme shows crystal clear, the day after its
gone ....
May be our friend Doug has some enlightening ideas on this ? (sorry
Doug, not Dough as i inadvertently wrote).
On 13-8-2025 14:50, John Woodgate wrote:
Hi, Gert. Can you please explain a bit more? Do you mean stored
charge in the dielectric? I suppose that if the cable is non-uniform,
either due to construction of damage in usage, there might be
separated charges in different places along the cable? I can't see
that any alternating voltages or currents could occur.
On 2025-08-13 13:40, Gert Gremmen F4LDP wrote:
In EMC world it is of utmost importance to rinse coaxial cables with
clean DC before
using them as a snesituve measurement cable. It's what i learned my
customers before a beer (or was it after the beer ? not sure)
You never know what QRM is left over from a previous measurement/
application!
Is that what you meant to address , Dough ?
On 13-8-2025 7:07, doug emcesd.com wrote:
We all know that coaxial cables have some pretty amazing properties
for ac signals. But at DC they also have different but still
amazing properties. Anyone here use coaxial cables for dc power,
nothing to do with ac "noise" shielding like we usually use them?
Doug Smith
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