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Old July 4th 10, 08:07 AM posted to rec.radio.amateur.antenna
Ian Jackson[_2_] Ian Jackson[_2_] is offline
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First recorded activity by RadioBanter: Nov 2007
Posts: 568
Default coax short supply

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,
BillyBobMarley writes
On Jul 3, 11:54*am, walt wrote:
On Jul 3, 10:11*am, "Ralph Mowery" wrote:



"Ian Jackson" wrote in message


...


But, when the coax is stretched, what happens to the characteristic
impedance and the loss? [This is a (sort of) serious question!]
--
Ian


If the ratio of the conductors stay the same, there should not be a change
except the losses go up. *As you streach the coax, the shield and
the center
conductor will get smaller. *Also the dialectric will have to get smaller.
If they do not srink at the same ratio, the impedance will change depending
on which conductor gets smaller the fastest.


The losses will go up because the center conductor and the outer conductor
are smaller. *This is the simple IR loss of the conductors. *It is the same
as going from a rg-8 to a rg-58 type coax.


I'd be pleased to trade two buckets of prop wash for a coax stretcher.
Any takers?

Walt, W2DU


I see your prop wash and will give you a left handed pipe wrench in
exchange.If not the pipe wrench how about a can of muzzle blast?


I suppose a long screw is out of the question?
--
Ian