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#12
May 15th 06, 04:56 PM
posted to rec.radio.amateur.antenna
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F connectors
Allison wrote:
On 15 May 2006 05:49:18 -0700, wrote: John Ferrell wrote: Any one know what power level an F connector can operate? In real use it's probably better than a phono plug, and for example Heath radios use phono plugs (HW-101 etc.) up to the 100W power level up to 30MHz. If anything the F connector is going to be a better impedance match into the VHF than a phono plug! Actual limit (if you want to push to the hairy edge where the connector is getting damn hot) will depend on frequency, SWR, cabling, etc., that you don't tell us. Tim. I'd take a more direct shot. The connector can likely take whatever the RG59 or other 75 ohm cable limits it too. Likely the limiting factor is voltage breakdown. At 75ohms you get to higher voltages for the same power than you would using a 50ohm system. If it's one of those F connectors that use the centre conductor of the cable as the 'pin' of the plug, the limit might be the quality of that connection. Is the wire short or long? Clean or corroded? Bent or straight? Does it have a clean-cut end, or was it mashed flat? Who knows... I'd bet in the 200W range is not unreasonable. Probably so... and probably more, if desperate enough. But reliability is a different matter. F connectors were designed for the cable industry, to be used by the millions at the lowest possible cost. It doesn't seem like a good idea to use such connectors in amateur radio, unless there is some other compelling reason. -- 73 from Ian GM3SEK 'In Practice' columnist for RadCom (RSGB) http://www.ifwtech.co.uk/g3sek |
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