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Some help needed with threads
3/8-24TPI and 5/8-24TPI
| Anthony Knights | 20/05/2021 08:16:49 |
| 681 forum posts 260 photos | Posted by Joseph Noci 1 on 19/05/2021 20:04:09:
Posted by Andrew Johnston on 19/05/2021 09:54:29:
The SO239 connectors are a blast from the past, must be 40 odd years since I've used one. Andrew Still standard fare on almost all modern Ham Transceivers , not only on the HF Antenna connection, but even on VHF and UHF - in fact, the SO239 was known as a UHF connector.. Used on most CCTV equipment in the '70's and early 80's, until increasing miniaturisation caused a change to BNC connectors. |
| Andrew Johnston | 20/05/2021 11:38:56 |
 7061 forum posts 719 photos | I don't recall the SO239 being used much above a couple of hundred MHz due to non-constant impedance through the connector. Above 300MHz we used BNC and SMA, or waveguides! Although the SO239 is labelled as a UHF connector apparently that is because it was developed in the 1930s when UHF meant over 30MHz, not the modern definition of UHF as 300MHz to 3GHz. Andrew |
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