In message <31823B55.35DF@wow.net> Ember writes:
>Tony Renshaw wrote:
>
>> Dear Richard,
>>
>> Any tips on the installation of your conduits, and detail on what a "BNC
>> Connector" is, would be great.
>
>A BNC connector is a "Bayonet Nut Coupler" which is a coaxial plug and
>socket, available, as "in line" or "panel mounted" versions. Its virtue
>is that it maintains a 50 ohm impedence, same as your coaxial cable. Not
>too easy to solder in place, but not impossible !
Close.
BNC = Bayonet Neil Concelman
TNC = Threaded Neil Concelman
According to the IEEE (Institute of Electrical and Electronic Engineers)
journal "Spectrum" in which Neil Concelman was interviewed and explained the
design ideas. As Tony says, they maintain constant impedance along the
transmission line (connectors like PL259/SO239 don't) which basically means
that more of the tranmitter power gets out and more of the received signal at
the antenna actually gets into the radio. They are also mechanically quite
resilient .Full size 'N' connectors (which actually have the same connecting
hardware) are better but are larger and heavier. They are suited to repeated
plugging/unplugging and are common on low/medium end professional equipment.
The Bayonet version is faster but more susceptible to oxidation and impedance
discontinuity.
Mike G1VOX (no, not G-IVOX sadly)
P.S. They aren't difficult to assemble when you get the basic idea. They are
well worth the extra effort. You are building an aircraft after all!
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