Electronics > RF, Microwave, Ham Radio
Is is possible to repair a hairline crack in semi-rigid coax?
syrnyca:
--- Quote from: joeqsmith on June 05, 2023, 01:43:29 am ---One way to perform the repairs it is to remove the bad part of the cable and add on a bit of extra. I saw a ham once who made a video where they connected several adapters in series and then claimed it had minimal effect.
While you can see we did remove the hump that was caused when we damage the cable, we also picked up a new disturbance from our added connectors. What worked for our friend the ham may not work for your setup. My advice is still replacement and learn from it.
--- End quote ---
Regarding the video you posted of that ham - sure those principles don't apply when it comes to higher frequencies and, as we've seen in this case, coax repairs, but I have to ask what exactly is incorrect in the ham's analysis?
For lower frequencies HF and maybe some VHF, adapters don't introduce much in terms of insertion and reflection losses. Provided they are good quality and properly mechanically fastened adapters, of course. Or is this statement untrue?
joeqsmith:
--- Quote from: syrnyca on September 06, 2024, 10:54:14 am ---
--- Quote from: joeqsmith on June 05, 2023, 01:43:29 am ---One way to perform the repairs it is to remove the bad part of the cable and add on a bit of extra. I saw a ham once who made a video where they connected several adapters in series and then claimed it had minimal effect.
While you can see we did remove the hump that was caused when we damage the cable, we also picked up a new disturbance from our added connectors. What worked for our friend the ham may not work for your setup. My advice is still replacement and learn from it.
--- End quote ---
Regarding the video you posted of that ham - sure those principles don't apply when it comes to higher frequencies and, as we've seen in this case, coax repairs, but I have to ask what exactly is incorrect in the ham's analysis?
For lower frequencies HF and maybe some VHF, adapters don't introduce much in terms of insertion and reflection losses. Provided they are good quality and properly mechanically fastened adapters, of course. Or is this statement untrue?
--- End quote ---
I did not make any statements about their analysis. Seems you've answered your own questions. It depends on your requirements.
coppercone2:
I think you can plate fill these things the challenge would be not getting electrolyte under the skin.
Theoretically if you sensitize the plastic, and micro grind the crack into a V shape, it should fill 100% with plating and be as good as new if you have clean electrolyte that makes low stress copper.. the process is called electroplate joining or electroplate welding or electrochemical joining
what I would be curious about though is how good using the highest conductivity MG chemicals silver epoxy to fill the crack
Bud:
Fill the crack with SMT paste and reflow? Molten paste will fill the gap down to the inner side of the shield.
coppercone2:
the problem with all temperature things is that its clad over a low max temperature substance. if it was teflon filler your fine probobly but I would still recommend just pressing a big soldering iron into it instead of using air so its faster heat transfer
if its poly ethylene you need to be cold
foam is mega unstable with temperature increase
I don't unders tand how your supposed to terminate this stuff if you cant solder the outer bit though. usually hard line is soldered on the outside for the connector. I guess its like swaged or some shit
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