I'm sure this seems like a google question, but I've BTDT and come up empty
The problem I'm trying to solve is to obtain cables that are as "leak proof" as possible. Tried Pasternak "100% shield" and they leak like a sieve. Tried Andrew FSJ1-50 (F1B-PNMBM-1M) which is pretty good, but leaks at both ends, apparently due to the joining to the connectors.
Given that a commercially made cable isn't good enough here, I'm tempted to make my own, and if I'm going to that much trouble I want the best. I keep seeing references to "Superscreened" or "double Superscreened" coax, which has braid and mu-metal, but I can't find anywhere that sells such cable.
I'm hoping someone here knows where I can find it, and the appropriate BNC ends so I can fab some quality cables. I'm not too concerned about cost.
Premade 1m cables, BNC male to BNC male would be best, but only if the connectors are put on so that they don't leak.
I am working inside a faraday cage sending test signals to multiple antennas, and I don't want the coax radiating anything significant. The ferrite bar antennas have a gain on the order of -80db so leakage from the cables can dominate the signal at the reciever, and I can't use any other type of antenna here.
If there's another way to solve this, that would be great.
Frequency of interest is <1MHz.