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
Sent from my iPhone
IPhone: 408-858-4528
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Email: [email protected]
Website: http://dsmith.org
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