Identifying coax connections etc

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Tom McCarthy
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Identifying coax connections etc

Post by Tom McCarthy »

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.

http://www.rfcables.com/Technical_Connector-Glance.htm


Tech-ConnectorsGlance.pdf
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Richard Hull
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Re: Identifying coax connections etc

Post by Richard Hull »

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
Attachments
SHV BNC  used in some HV supplies and a lot of NIM
SHV BNC used in some HV supplies and a lot of NIM
SHV BNC.jpg (4.64 KiB) Viewed 11190 times
HN used for HV RF and HV DC power coax
HN used for HV RF and HV DC power coax
HN.jpg (8.28 KiB) Viewed 11190 times
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Jerry Biehler
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Re: Identifying coax connections etc

Post by Jerry Biehler »

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.
ian_krase
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Re: Identifying coax connections etc

Post by ian_krase »

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