[Boatanchors] Old RG-8 cable antennuation at 430MHz

[Glenn Little WB4UIV]

With age and heat the dielectric changes electrically.
As the cable ages, the loss will go up due to this dielectric deterioration.

I understand that some cellular companies change out the hardline on 
their towers at some interval to reduce the loss.

73
Glenn
WB4UIV



At 02:53 PM 6/28/2013, HL1FB wrote:
>Hello;
>
>  I experimented 430MHz atennuation with 3 different RG8 cables.
>
>I connected a RG8 cable terminated with a 50 ohm dummy load and applied
>
>30W 435MHz output from Icom IC2720. I connected a Bird wattmeter at the output
>
>of the IC2720 and another one at the dummy load. So the difference of power
>
>indication is the loss of the cable under test.
>
>
>
>Old RG-8 5.3 meter long indicated 33% loss of power.
>
>Another old RG-213 6.3 meter long indicated 19% loss of power.
>
>New RG-8 cable 11.9 meter long (different brand) showed only 20% 
>loss of power.
>
>
>So it looks like new cable has much low antennuation.
>
>Is this normal? Does someone has experience with this?
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