Talking about good UHF connectors, recently I put several Andrew 44ASP UHF
male connectors on some 1/2" Heliax, and I think they will stand high power
quite well also mechanically are excellent but price $$$.
73, Jaime EA6NB
} -----Mensaje original-----
} De: owner-amps@contesting.com [mailto:owner-amps@contesting.com]En
} nombre de Ian White, G3SEK
} Enviado el: Wednesday, November 22, 2000 07:52
} Para: amps@contesting.com
} Asunto: Re: [AMPS] Hi Power Connectors
}
}
}
} Ian Roberts wrote:
} >
} >
} >
} >Vic Rosenthal wrote:
} >>
} >> Chuck Counselman wrote:
} >> >
} >> > Yes, I appreciate that a UHF connector must not
} >> > be used where it might get wet, and that mechanically it's a
} piece of junk.
} >>
} >> I think the "UHF" connectors are great, appropriate technology
} for 1-2 KW HF
} >> applications, as long as you waterproof them. Properly
} installed, there's
} >> nothing junky about them. Actually, in my experience the most
} important
} >factor
} >> (after installation and coax seal), is that the so-239 be of
} high quality to
} >> insure good contact to the center pin.
} >
} >The term "UHF" is a complete misnomer in discussing these connectors.
} >They are strictly HF devices. VSR above around 140 MHz is too high.
} >The better types use PTFE, bakelite or similar insulation (won't melt
} >when heated with a soldering iron). Some Taiwanese types melt down at
} >soldering temps.
} >Some don't "wet" readily with solder, especially around the earth plane
} >and the plating needs to be scraped off to achieve a bond. A gold-plated
} >inner is probably a plus factor.
} >
}
} The main problem with both connectors is quality - but in different
} ways.
}
} With the "UHF" the problems is manufacturing quality of the cheaper
} ones, as Ian says... so buy MIL-spec ones.
}
} With N, the manufacturing quality is generally good, but there can be
} big problems with the way we hams use them. When a loose-pin type of
} plug is fitted without a cutting jig, the pin can wind up a long way
} from the correct position, and sooner or later it will pull back or push
} through. Also, we try to fit them to unsuitable cable such as 9913 where
} you have to file the inner conductor and usually get it tapered and/or
} off-center (yes, I know you can buy special center pins, but "real hams"
} don't). All these things are failures waiting to happen.
}
} I still have a few Ns in the 432 1.5kW setup, but those are new plugs
} with captive pins and have been fitted very carefully. If they're not
} OK, they let me know pretty quick, and then are replaced with 7/16.
}
} Start looking out for 7/16 at hamfests. They used to be very rare in
} Britain, but thanks to the cellular industry they quite suddenly
} started to appear as surplus over the last year or two.
}
} 73 from Ian G3SEK Editor, 'The VHF/UHF DX Book'
} 'In Practice' columnist for RadCom (RSGB)
} http://www.ifwtech.com/g3sek
}
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