Looked it up in a Nemal Electronics Catalog, and you remembered correctly, Jeff. Both cables are identical except for the jacket on RG393 is -70 to +200 degree C fluorinated ethylene propylene (FEP) and OD 390 mils. RG225 is -70 to +250 degrees C and fiberglass/ silicone braid and OD 430 mils Both should say Mil C-17D, just a little higher operating temp on RG225.
John
toggle quoted message
Show quoted text
On 04/07/2025 6:04 PM EDT Jeff DePolo WN3A via groups.io <jd0@...> wrote:
? It is an older variant of RG-393. I know it's 393 and I know it's 50 ohms.
Apparently, I didn’t receive the original post, only your follow-up response. Questions:
1. What is the measured OD of the cable?
2. Does it have a single layer of woven braid for the jacket or two layers?
3. Does it feel like fiberglass or something else like a high-temp polymer?
4. It is actually marked Amphenol and RG-393? Any other markings, part number, etc.?
I’ve seen/used this type of cable in high-temperature and high-power applications; I even have a few jumpers here. What confuses me is that I remember it being larger in diameter than RG-393 (390 mils), and likewise, what I have here at the shop is also larger OD - 430 mils or thereabouts, close to RG-214 if not a hair bigger. What I have here has no markings on it all, but I've always known this type of cable to be RG-225.
Also, I don’t remember ever seeing any marked as RG-393, so that’s why I asked about what is printed on your cable. I do have some old Amphenol catalogs around somewhere, but in the meantime, look up RG-225 to see if that’s close to what you have.
--- Jeff WN3A
