|
Hints, Tips and Solutions (Do NOT post requests for help here) If you have any useful general hints and tips for vintage technology repair and restoration, please share them here. PLEASE DO NOT POST REQUESTS FOR HELP HERE! |
|
Thread Tools |
27th Aug 2021, 3:41 pm | #1 |
Dekatron
Join Date: Aug 2016
Location: Colchester, Essex, UK.
Posts: 4,108
|
Green goo in coax
You're all aware of the green goo interaction between old PVC and copper..I saw it in coax for the first time today. I suspect that digital signals are more vulnerable to bad connections caused by this sort of thing, leading to blocking, dropouts, pixellation, nerve shattering digital screeches etc. Hopefully resolving this will solve the issues i've been trying to ignore for months- only permanent cure in this case though, is to rip out all the cable and replace. Oh Joy..
Dave |
27th Aug 2021, 4:30 pm | #2 |
Octode
Join Date: Aug 2006
Location: Stoke-on-Trent, Staffordshire, UK.
Posts: 1,082
|
Re: Green goo in coax
while I was in the trade I was called to a faulty Rotel tuner on opening it up i could see that the input socket was corroded on checking the installation I noted that the coax feeder cable when opened up was full of water ! My conclusion an open connection box at the arial end had allowed rain water in .This along with the height difference created enough pressure for the rain water to enter the tuner and create the corrosion
Trev |
27th Aug 2021, 5:20 pm | #3 |
Dekatron
Join Date: Apr 2012
Location: Wiltshire, UK.
Posts: 14,007
|
Re: Green goo in coax
I've seen the green goo in some coax; it's usually caused by the plasticiser degrading and reacting with the copper. Added moisture helps the process along.
Black corrosion on the braid is another nof-unusual thing; again, water ingress is usually to blame. In either case the coax is scrap. |
27th Aug 2021, 5:22 pm | #4 |
Dekatron
Join Date: Aug 2011
Location: Newcastle, Tyne and Wear, UK.
Posts: 11,575
|
Re: Green goo in coax
I saw a Freesat receiver completely ruined in the same way, satellite coax makes a great drainpipe if the connection at the LNB is not waterproofed with self-amalgamating tape. I've seen some dish installations where the bare 'F' connector was just left to fend for itself.
|
27th Aug 2021, 6:01 pm | #5 |
Guest
Posts: n/a
|
Re: Green goo in coax
A generous slavering of Vaseline also helps, and I mean generous to the point of very messy.
|
27th Aug 2021, 9:27 pm | #6 |
Dekatron
Join Date: Aug 2016
Location: Colchester, Essex, UK.
Posts: 4,108
|
Re: Green goo in coax
Post No.3- Rightly or wrongly, I associate 'black rot' with exposure to salty air. I've known it travel more than 12 inches up inside automotive wiring.
Dave |
27th Aug 2021, 11:24 pm | #7 | |
Octode
Join Date: Mar 2006
Location: Watford, Hertfordshire, UK.
Posts: 1,270
|
Re: Green goo in coax
Quote:
__________________
Whether the Top Cap is Grid or Anode - touching it will give you a buzz either way! |
|