[Elecraft] BNC connectors for RG-8X Coax

[Fred Townsend]

There is good reason why power ratings are not stated. Ratings vary by frequency and particularly by VSWR. Using a tuner may improve the load seen by the rig but will also increase losses on the antenna side of the tuner.  Skin effect means only the outer 1% of the conductor is passing current. I would think twice about running more than 100 watts at HF or 50 watts at VHF and above through a BNC connector, never mind the coax. 

73, Fred, AE6QL

-----Original Message-----
>From: Walter Underwood <wunder at wunderwood.org>
>Sent: Oct 9, 2014 8:50 AM
>To: "elecraft at mailman.qth.net" <elecraft at mailman.qth.net>
>Subject: Re: [Elecraft] BNC connectors for RG-8X Coax
>
>BNC power handling is similar to UHF connectors. BNC connectors are rated for 500V, same as UHF connectors. Amphenol does not specify contact resistance for UHF connectors. The full BNC specs are here:
>
>http://www.amphenolrf.com/products/CatalogPages/BNC.pdf
>
>wunder
>K6WRU
>CM87wj
>http://observer.wunderwood.org/
>
>On Oct 9, 2014, at 8:34 AM, WILLIS COOKE via Elecraft <elecraft at mailman.qth.net> wrote:
>
>> I don't think you will have trouble with legal power.  I regularly run 1 KW through RG8X without problems.  I did have some trouble running over about 400 watts with a Carolina Windom running RG8X but I don't know what was shorting, the coax or the chokes or balun.  RG8X is the same outer diameter as RG-79 so the RG-79 BNC will fit.  The impedance bump is so short that you will not notice it at 6 meters or below.  If you are trying to run microwave, you might have trouble buy the pin and socket are the same for the RG-58 and RG-59 connectors. The insulation thickness is what makes RG-8X have a higher rating than RG-58.
>> 
>> Willis 'Cookie' Cooke, TDXS DX Chairman
>> K5EWJ & Trustee N5BPS, USS Cavalla, USS Stewart
>> 
>> 
>> On Thursday, October 9, 2014 8:01 AM, David Cole <dave at nk7z.net> wrote:
>> 
>> 
>> 
>> Hi,
>> Looking at the tech spec sheet I don't see a power rating?  Also
>> remember these are 75 ohm connectors...  Anyone know what the max power
>> you can pump through one of these are?-- Thanks and 73's,For equipment, and software setups and reviews see:www.nk7z.netfor MixW support see;http://groups.yahoo.com/neo/groups/mixw/infofor Dopplergram information see:http://groups.yahoo.com/neo/groups/dopplergram/infofor MM-SSTV see:http://groups.yahoo.com/neo/groups/MM-SSTV/infoOn Thu, 2014-10-09 at 04:59 -0700, Dennis Griffin wrote:> Sorry, here is a source for a connector similar to what I believe you are seeking, Phil, except that it's for LMR-200. The Tessco & TimesMicrowave sites also have good connector, and coax, info.> > http://www.newark.com/amphenol-connex/112597/rf-coaxial-bnc-plug-str-50-ohm/dp/99H4490?ost=99H4490> > 73 de Dennis KD7CAC> Scottsdale, AZ> > On Oct 9, 2014, at 4:17 AM, Dennis Griffin <EagleEyeDennis at gmx.com> wrote:> > > I have ordered several jumper/adapter cables made with RG174 from WiFi RF Expert. They have been good quality. An example is a 24" RG174 BNC Male 90° to UHF
>> Female for $12.29. He can custom make most anything an OM might want. RF Parts is a source for various RF connectors & inline adapters.> > > > 73 de Dennis KD7CAC> > Scottsdale, AZ> > > > On Oct 9, 2014, at 3:38 AM, Joel Black <w4jbb at charter.net> wrote:> > > >> Phil,> >> > >> When I need one, I have been using the RF Industries RFB-1101-1P. These are solder-pin / clamp connectors. I don't remember from where they were purchased.> >> > >> I don't remember what put me on these. I use them indoors only from my KX3 to an antenna switch and from the RX connector on my K3 to an antenna switch. I also have a 25' piece of RG-8x with a PL-259 on one end and the BNC on the other for when I go to the park and operate. I have not had any failures with them; your mileage may vary. :)> >> > >> 73,> >> Joel - W4JBB> >> > >> On 10/9/14, 12:18 AM, Phil Hystad wrote:> >>> I am looking to use BNC (male) connectors for RG-8X cable.  I have found a number of crimp style
>> connectors but I am wondering if there are any other kind to consider.  Are the crimp style the best for reasonable cost?> >>> > >>> My application does not need to be weather protective -- all use indoors.> >>> > >>> Thanks,> >>> > >>> 73, phil, K7PEH> ______________________________________________________________> Elecraft mailing list> Home: http://mailman.qth.net/mailman/listinfo/elecraft> Help: http://mailman.qth.net/mmfaq.htm> Post: mailto:Elecraft at mailman.qth.net> > This list hosted by: http://www.qsl.net> Please help support this email list: http://www.qsl.net/donate.html> Message delivered to dave at nk7z.net
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