Identifying coax connections etc

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Tom McCarthy
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Identifying coax connections etc

Post by Tom McCarthy » Fri Jan 05, 2018 7:35 pm

I found this webpage helpful for identifying different RF related connections, for coaxial cable and so on. See the attached pdf in case the website goes down.

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Richard Hull
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Re: Identifying coax connections etc

Post by Richard Hull » Fri Jan 05, 2018 9:12 pm

The PDF above gives only a smattering of connectors.

Two key connectors to be found common in HV RF and NIM in the nuke instrument biz.

HN connectors - This connector is rarely seen at hamfests. If you can find an old one ($5-$10). (new- pasternack $38) Finding one on cabling - Super rare! Almost always a make your own cable situation. Pasternack can charge well over $100 for a 6 footer male-male. Keithley and some Fluke precision, regulated, 0-5000 volt, vacuum tube based, surplus power supplies used only this connector.

SHV-BNC connector Almost never found as a lone connector. New, the simple male connector can cost $30-$50. Pasternack sells a 6 foot male-male coax for $90.00+ You will have to luck out to find a surplus cable. A lot of vacuum HV feed throughs use vacuum tight female SHV's for 10kv+, demanding a male cable be on hand. A lot depends on the area you are in. You might be awash in them in high tech cities with large vacuum and physics research/technical centers. Sadly, in Forest Glen, North Dakota you will find a flask of Romulan ale easier to locate than a surplus SHV-BNC cable.

The adapter seen in the attached image could be a SHV to MHV or SHV to BNC.... both exist and Pasternack gets just under $110.00 for each adapter.

Richard Hull
SHV BNC used in some HV supplies and a lot of NIM
SHV BNC.jpg (4.64 KiB) Viewed 2935 times
HN used for HV RF and HV DC power coax
HN.jpg (8.28 KiB) Viewed 2935 times
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Jerry Biehler
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Re: Identifying coax connections etc

Post by Jerry Biehler » Sat Jan 06, 2018 1:59 am

Also there are two kinds of N connector, 50 and 75 ohm. The difference is the 75 ohm connector has a larger center pin. If you connect a 75ohm N male to a 50ohm female you can damage the 50ohm. That being said 75ohm N connectors are rare as hens teeth so you will probably never see them.

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Re: Identifying coax connections etc

Post by ian_krase » Sat Jan 06, 2018 9:11 am

Don't forget the Spellman PL259 with long banana-tipped coax extension.

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