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

[Glen Zook]

Not surprising!  The old RG8/U specifications did not call for non-contaminating jacket.  RG213/U specifications do call for non-contaminating jacket.  Over the years, the jacket contaminates the braid and the losses do increase.
 
Glen, K9STH


Website:  http://k9sth.com


________________________________
 From: HL1FB <yonglee at yonsei.ac.kr>
To: boatanchors at mailman.qth.net 
Sent: Friday, June 28, 2013 1:53 PM
Subject: [Boatanchors] Old RG-8 cable antennuation at 430MHz
 

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?