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

[Raymond Cote]

At sea during sat comm, I changed out all my feeds including connectors, every 2 years. And yes all connectors were waterproofed twice finishing with epoxy filled shrink tubing. 
YMMV

"During times of universal deceit, telling the truth becomes a revolutionary act." George Orwell

On Jun 28, 2013, at 15:14, "Glenn Little WB4UIV" <glennmaillist at bellsouth.net> wrote:

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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