Date: Wed,  9 Feb 94 04:30:08 PST
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Subject: Info-Hams Digest V94 #126
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Info-Hams Digest            Wed,  9 Feb 94       Volume 94 : Issue  126

Today's Topics:

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Date: 8 Feb 1994 20:09:17 GMT
From: agate!howland.reston.ans.net!math.ohio-state.edu!news.acns.nwu.edu!ftpbox!mothost!delphinium.cig.mot.com!rtsg.mot.com!reichrt@network.ucsd.edu
To: info-hams@ucsd.edu

References <Anthony_Pelliccio-070294092539@138.16.64.8>, <2j6rtmINNf0s@abyss.West.Sun.COM>, <Anthony_Pelliccio-080294103950@138.16.64.8>tsg
Subject : Re: N connectors (was Re: "Flexible" 9913 (Was - Re: Coaxial cab

In article <Anthony_Pelliccio-080294103950@138.16.64.8>, Anthony_Pelliccio@brown.edu (Tony Pelliccio) writes:
|> In article <2j6rtmINNf0s@abyss.West.Sun.COM>, myers@cypress.West.Sun.COM
|> (Dana Myers ) wrote:
|> 
|> > >Actually, most equipment for dual-band use is sold with so-239 and pl-259
|> > >connectors. The loss isn't that much so you'd actually notice it. You'll
|> > >find N used in applications where every bit of loss counts like repeaters
|> > >etc.
|> > 
|> > N connectors also make an effort to be weather resistant where PL-259/SO-239
|> > do not.  Land mobile radios seem to use SO-239 up to UHF (512MHZ max), then
|> > N connectors (800/900, etc.).
|> > 
|> 
|> I had forgotten the weather resistance issue. But you're right in that most
|> land-mobile radios tend to use SO-239 instead of N. But buy a UHF repeater
|> and guess what, N connectors. By the way, I've finally met an N connector
|> that I like. It's for the 9913 and it's GREAT! You don't have to comb out
|> braid, you don't have to go nuts with 9 different parts, etc. This one is
|> two pieces, you strip the coax down a bit, screw it in, use a bit of solder
|> and you're in business. 
|> 
|> 
|> Tony
|> -- 
|> == Anthony_Pelliccio@Brown.edu (Tony Pelliccio, KD1NR)
|> == Brown University Alumni & Development Computing Services
|> == Box 1908, Providence, RI 02912 Tel. (401) 863-1880
|> == I speak for myself, and not for Brown University. Remember that!


SO-239, PL-259 provide a loss of approximately .5dB per connection at 145Mhz and a poor 50 ohm connection.  Time Domain Reflectometer measurements indicate over 2:1 VSWR (Impedance Bump!) at the connection.

Whereas N connector's have appr'x .042dB Insertion Loss and an excellent 50 ohm connection.

Basically use SO-239, PL-259 below 30Mhz.  I still wish manufacturers would use N connectors on all gear.  I find them mechanically and electrically better all around.


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     | Charles H. Reichert    708-632-6669 Work - MOTOROLA, INC  Cellular |
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End of Info-Hams Digest V94 #126
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