Worth changing coax?

[AceB]

I'm soon to start decorating our lounge and this will mean the coaxs from the dishes will be buried in the wall so this is my last chance to try and screw every last uV from the fringe signals.
Currently the feed from the big dish is an old but good condition run of what looks like Raydex CT100, thick foil and good amounts of braid although the foil looks to have a few ripples in it, probably where it's been coiled and uncoiled over the years. Is it worth shelling out on 15m of CT125 to replace this, I'm guessing there is quite a bit of gain on the Inverto BU so I'm not actually sure I'll gain much by changing the coax to something slightly less lossy?
There is at the moment an F socket faceplate that the CT100 terminates on and a CT125 patch lead into the sat card, how much loss is there on these things and do they ever cause odd effects at certain frequencies? I've got enough slack in the roof that I could remove the socket and feed the cable through the front of the plate and connect it directly to the card if it's worth doing.
If I had some spare CT125 I'd make up a long lead and compare results but as I don't I'm wondering if anyone has practical experience of comparing coax's on shortish runs?

[pedro2000uk]

Originally Posted by AceB

I'm soon to start decorating our lounge and this will mean the coaxs from the dishes will be buried in the wall so this is my last chance to try and screw every last uV from the fringe signals.
Currently the feed from the big dish is an old but good condition run of what looks like Raydex CT100, thick foil and good amounts of braid although the foil looks to have a few ripples in it, probably where it's been coiled and uncoiled over the years. Is it worth shelling out on 15m of CT125 to replace this, I'm guessing there is quite a bit of gain on the Inverto BU so I'm not actually sure I'll gain much by changing the coax to something slightly less lossy?
There is at the moment an F socket faceplate that the CT100 terminates on and a CT125 patch lead into the sat card, how much loss is there on these things and do they ever cause odd effects at certain frequencies? I've got enough slack in the roof that I could remove the socket and feed the cable through the front of the plate and connect it directly to the card if it's worth doing.
If I had some spare CT125 I'd make up a long lead and compare results but as I don't I'm wondering if anyone has practical experience of comparing coax's on shortish runs?

I think it is worth it even though 15mts is short plus use the shortest low noise route & lose any joins etc.. ... & go for Webro WF125 rather than ct125 - the near pure copper in Webro shows 6% difference over the high tensile copper & you should also gain a % noise wise on the bigger gap between the outer sheild & core over 100........... not much, ....... webro spec triax spec (similar to ct100 spec).

[ABA]

dont think they still make ct coax anymore

[AceB]

Useful info Pedro, thanks. I did say this CT100 was old but didn't realise it wasn't made anymore lol I'll look out for some WF125.

[pedro2000uk]

Originally Posted by ABA

dont think they still make ct coax anymore

I have it from a long standing cable supplier that the name is still used but the original company has changed - we don't use a cable of that name now but the Triax coax is about what is referred to as CT100 CT125 etc.. as are many others