Electronic – How is this Antenna Plug Type Called

OK, I contacted Molex and I found out that this is a Molex Mini Fit 3-pin connector custom-made part because the polarization is different from the standard Mini Fits. I asked which part number most closely resembled this one and was told Part Number: 39-01-4032, Mini-Fit Jr.™ Plug Housing, Single Row with Panel Mount Ears

I ordered some samples and this fits amazingly well. It has 2 square holes but they fit the mating 'pins' well. I had to cut in a groove to accomodate the key and I had to file down the lock tab so it could be disassembled without having to use a finger to lift the tab. So I have all the functionality of the original connector.

So it looks like alex.forencich and Michael Kjörling were right about the general type of connector. Thank you.

Question: do you have the proper crimp tool for the ferrules? If not, I strongly suggest that you have the cable custom-made by someone who does have the proper tools. One of our local stores does this as a service and their prices are reasonable.

You are using SMA connectors. The largest cable that I have used with SMA connectors is LMR-240 but I know that larger cable sizes are available with SMA connectors.

At your frequency, I would budget a 1dB loss for each mated connector (2dB loss for both ends). Add to that the losses introduced by the chosen cable to get an estimate of the total loss. You can then decide if those losses are acceptable.

Most of the cables that I make are for use in the 400MHz - 1GHz range: professional wireless microphone and intercom systems as well as 915MHz ISM band equipment. I use mostly LMR-240 because it a decent compromise between cable diameter vs cable loss and is relatively easy to handle.