Coax connectors

[Icom 706 King Cobra]

obviously there are many antennas out there..

as there are different types of coax..



yet as one goes to coax dsigned for lower losses to combat the higher losses of using vhf & especially uhf & higher frequencys..



it seems thatthe HF coax runs use mostly PL-259 or slightly better UHF connectors..



However it seems nearly all feedlines designed for uhf or higher frequencys instead use N connectors..



So what makes these connectors better..?



I have seen same antenna made 2 ways..

one with UHF connector & other with N connector..

The one using N connector shows a higher gain..

(yes i know it is only a db or so..still is higher)



Ofcourse N connectors are quite a bit more money as well



P.S. did anyone else see tech TV's latest show..

it shows some things inside F.C.C. labs

and also speaks of high speed internet over power lines..


</p>

 

[freecell]

the PL-259 / 83-ISP UHF rf connector was invented in the 1930's by an Amphenol engineer named E. Clark Quackenbush. UHF coaxial connectors are general purpose units developed for use in low frequency systems from 0.6 - 300 MHz. Invented for use in the radio industry, UHF is an acronym for Ultra High Frequency because at the time 300 MHz was considered high frequency.



UHF connectors feature a threaded coupling. Because these connectors are low-cost, the impedance is variable.



they do not have a fixed or constant impedance value.



generally speaking, connectors rated for operation above 300 mhz. have a fixed or constant value of impedance, usually 50 or 75 ohms.



UHF Specifications



Electrical

Impedance: Non-constant

Frequency Range: 0 - 300 MHz

Voltage Rating: 500 volts peak



Mechanical

Mating: 5/8-24 threaded coupling

Cable Affixment: Braid solder, set screw,

clamp and crimp



Material

Male Contact: Brass with silver plating

Female Contact: Beryllium copper with silver plating

Bodies: Brass and die cast zinc

Other Metal Parts: Brass

Plating: Nickel and silver

Insulators: TFE, copolymer of styrene, polystyrene,

mica-filled phenolic and PBT polyester or equivalent



Environmental

Temperature Range: Mica-filled phenolic insulators:

-55°C to +149°C Copolymer of styrene and polystyrene:

-55°C to +85°CTFE insulators: -65°C to +165°C

Weatherproof Except as noted, all UHF series are

non-weatherproof



"high speed internet over power lines........"



it's called BPL....Broadband over Power Lines.

you don't want it in your neighborhood if you're a radio operator on frequencies from roughly 2 - 60 Mhz.



you can listen to it for yourselves at either of the top two links on the page below.



www.firecommunications.co...ding.shtml


</p>Edited by: <A HREF=http://p067.ezboard.com/bworldwidecbradioclub.showUserPublicProfile?gid=freecell>freecell</A> at: 5/31/04 11:47 am

 

[KD5VHF]

<blockquote>Quote:<hr>in view of this however it still appears F.C.C. wish to go ahead full steam ahead..<hr></blockquote> <span style="color:red;">The power of the all mighty Dollar at work ! <img src=http://www.ezboard.com/intl/aenglish/images/emoticons/eyes.gif ALT=":rolleyes"> </span><img src=http://www.ezboard.com/intl/aenglish/images/emoticons/mad.gif ALT=">:">


<hr />73, Mike </p>