[HCARC] Crimped vs Soldered Coax Connectors??

Wed Sep 24 09:04:20 EDT 2014

OK, I give!  After this I will no longer comment on this.

Apparently any excuse not to look at the data from a network
analyzer counts for NOTHING!  Or some people refuse to
believe the results, whatever.

That or either some people still think that sense my father,
grandfather use it, it MUST be good.  Or maybe they cannot
understand the data, just not sure.

How many people on this thread REALLY looked at that URL
(above, 2 days ago)? And then understood the data?  If you
did, you'd know that there are better, much better RF connectors.
And the UHF sucks.  How many here know what "Constant
Impedance" really-really means?

I GIVE UP - seriously.  This has showed me some are set in
there beliefs and cannot be changed even with hard data
is given to them.

Remember, what ever is written back, i'll NOT READ,
any replies to this thread is getting dumped in the circular file
before read.

af5sa

On Wed, Sep 24, 2014 at 1:42 AM, John K5XA <k5xa at godfather-ridge.com> wrote:

> Just one more thing from me regarding PL-259 vs "N".
>
> Since getting my ticket in 1986 and gravitating towards HF contesting, I
> have had the opportunity to learn from some terrific contest operators, and
> also to visit and/or operate at some very "big gun" stations. I'm talking
> about consistent top ten stations like at K1TO, K3LR, K5RZ, K5RX, K5TR,
> K5RC, etc, etc, etc.
>
> There may have been, but I cannot honestly remember any of them using "N"
> connectors.
>
> K5XA
>
> -----Original Message-----
> From: HCARC [mailto:hcarc-bounces at mailman.qth.net] On Behalf Of Kerry
> Sandstrom
> Sent: Tuesday, September 23, 2014 10:16 PM
> To: hcarc at mailman.qth.net
> Subject: Re: [HCARC] Crimped vs Soldered Coax Connectors??
>
> Gary,
>
> N connectors are not necessarily 50 Ohm.  Normally N connectors are 50
> Ohm to match 50 Ohm cable.  You can get N connectors which are 50 Ohm
> impedance but are for 75 Ohm cable, RG-11/U for instance.  In this case
> the connector impedance doesn't match the cable impedance.  You can also
> get N connectors which are 75 Ohm impedance for 75 Ohm cable, RG-11/U
> again for instance.  50 ohm N connectors for 75 Ohm cable have a
> mechanical interface identical to the 50 Ohm connectors for 50 Ohm cable
> and will mate with each other.  N connectors with a 75 Ohm impedance
> will not mate with 50 Ohm N connectors and will damage the connectors if
> you try it.
>
> A 75 Ohm N Plug is UG-94A/U and yes they turn up from time to time. A 50
> Ohm N Plug is for 75 Ohm cable is UG-603A/U for RG-59/U.  A UG-21B/U is
> a 50 Ohm connector for 50 Ohm cable such as RG-8/U.  The same situation
> exists for BNC connectors and yes there are some 75 Ohm BNC connectors
> around and no, they don't mate with 50 Ohm BNC connectors.
>
> While N and BNC and most other connectors have a specified impedance,
> UHF connectors are simply listed as non-constant impedance.  The
> impedance depends on the ratio of inner and outer conductor diameters
> and the dielectric.  If you look at the design of a PL-259, you should
> note that the ratio of diameters is different as is the dielectric at
> different points of the connector.  That is why they don't have a
> constant impedance and you really can't say they are 32 or 37 Ohm or
> whatever.  N connectors on the other hand do maintain a constant
> impedance through out the connector.
>
> Another factor is the voltage rating of the connectors.  UHF connectors
> are rated for 500 V RMS while N connectors are rated for 1000 V RMS.  A
> KW at 50 Ohm impedance with no SWR is about 240 V.I probably wouldn't
> use UHF for legal limit or high SWR.
>
> Delta Electrtonics makes over 20 different type N connectors for 50 Ohm
> alone for different types of cable, none of which are for foam
> dielectric or aluminum foil outer conductor.
>
> By the way, the Radiation Lab series has a section on the design of N,
> BNC and other connectors for anyone interested.  Most of the constant
> impedance connectors were designed during World War II primarily for
> radar applications.
>
> Have fun,
>
> Kerry
>
>
> On 9/23/2014 8:53 PM, Gary J - N5BAA wrote:
> > Again guys - I am approaching much of this from the standpoint of the
> > NEW guy, just starting out and without a large investment in time,
> > already made up coax,  and the proverbial "parts box" full of
> > PL-259/so-239 connectors, UHF barrel connectors, etc.  I work with as
> > many new guys as anyone in the club.  To them it's a significant
> > expense on top of everything else, and if you remember I admitted I am
> > one of those guys who still views proper soldering as an art I haven't
> > mastered yet.
> >
> > Kerry - why 37 ohm for PL-259 - because that is the number I hear
> > banty'd around for them.  I think I am correct in 50 ohm for the N
> > connector.  BTW, you should be happy - you have almost converted me to
> > the N whenever possible.  That and all my Alpha-Delta surge
> > suppressors have N connectors so it doesn't make sense to work backwards.
> >
> > Gary J
> > N5BAA
> >
> > --
>
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