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Amphenol Old Style RG-393?

 

Hi all,?

I recently just picked up an item from Facebook marketplace, taking the chance on it. It was a roll of unknown coax. The seller took pictures of the roll and the end of the cable. I counted the center conductor stranding, and counted 7. It was silver plated. Having made tons of cable with RG-393, this was my best guess. I reached out and he shipped it to me for $50.
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Low and behold, I have 230ft of this RG-393. However, it has a braided outer jacket, has a thin layer of what I think is PTFE? separating the outer braided jacket from the shield. There are two silver plated copper shields, then wrapped PTFE? around the center conductor. Does anyone have any info on this cable? Data sheets? Tricks for terminating it? From what I can find out, it was used for military applications. I have attached a few photos of it.
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Thanks,
Joe KC3LMP
 

Internet has all your info, its 50 ohm and would be great for jumpers between a repeater and other stuff. Connectors are available in many types.?
 

I don't think you understood my question...I am asking about this specific cable. It is an older variant of RG-393. I know it's 393 and I know it's 50 ohms. I'm aware of every RF connector. I'm looking for information on this specific style of 393. The internet is of no help on this cable. Termination is definitely different than the solid FEP because of the braided sheath. Obviously need to keep it from unraveling itself.?
 

? 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
 

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

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
 

I think you guys figured it out. It is 0.43 outside diameter and looking up RG-225/U yields the same cable that I have. The cable I have has absolutely no markings on it. The only reason I know it was made by Amphenol is because there was a ribbon on the spool saying "Amphenol Electronics Corporation" on it. It has a single layer of outer woven braid from what I can tell.?

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