[TowerTalk] LMR400-PL259s

[Steve Katz]

This isn't true.

The military specification for type PL-259, which is about a 60 year-old
specification now, does not allow for an undersized center pin that only
fits the #13 AWG center conductor of RG8/U or RG213/U.  Not at all.  Never
did, still doesn't.

RG8 "foam" types like Belden 8214 always had an #11 AWG center conductor,
which is already two steps larger than RG8-RG213.  Times FM8 always had a
#10 AWG center conductor, which is already three steps larger than
RG8-RG213, and FM-8's been on the market for 40 years.  The "new" cables
like 9913 (which came to market in about 1984) and LMR-400 (which is more
recent) have a #9.5 AWG center conductor that's only a few thousandths of an
inch larger than FM-8.

ALL PL-259's, if they are built correctly to the actual PL-259
specification, will accommodate LMR-400 without modification.  The actual
mechanical detail specification provides for it.

-WB2WIK/6

-----Original Message-----
From: N3PKC [mailto:n3pkc at hotmail.com] 
Sent: Tuesday, September 04, 2007 10:04 AM
To: towertalk at contesting.com
Subject: Re: [TowerTalk] LMR400-PL259s

There's problems with using standard or run of the mill PL-259's on newer 
9913 and LMR400 because the center conducter is much larger in diameter 
than the old RG-8U or 213 they were usually intended for use with.

If you tell the folks you're buying them from and they're experienced enough

(HRO AES), they can give you a connector that should work.  LMR400 has the 
biggest center conductor of any other RG8 style coax I've worked with but's 
easy to file down if needed to fit a connector.  I've done this many times 
with a little bastard mill file.  Often I've lost the copper clad and was 
left with aluminum, but it seemed to bond well under the torch.  No 
complaints over the years though, and the PVC jacket is nice as it melts a 
little around the connector and can seal it much better than rubber jacketed

9913.  The LMR400 has a very nice attenuation rating and is pretty durable.




----- Original Message ----- 
From: "Steve Katz" <stevek at jmr.com>
To: <WW5L at gte.net>; "TowerTalk" <TOWERTALK at contesting.com>
Sent: Tuesday, September 04, 2007 12:43 PM
Subject: Re: [TowerTalk] LMR400-PL259s


> LMR400 = standard PL-259
>
> WB2WIK/6
>
> -----Original Message-----
> From: Tom Anderson [mailto:WW5L at gte.net]
> Sent: Tuesday, September 04, 2007 9:26 AM
> To: TowerTalk
> Subject: [TowerTalk] LMR400-PL259s
>
> I'm having to redo my feed through window (XYL wanted new windows) which
> will necessitate cutting the LMR400 preassembled cable I bought 3 years
> ago.  Will the "standard" PL259 work on LMR400 or is there a special
> connector I need?
>
> Tom, WW5L
>
>
>
>
>
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