Thanks for the clarification Jim.
I knew they weren't 7/16" but I kept hearing them referred to as 7/16ths
around here (meaning locally).
73
Roger (K8RI)
Jim Thomson wrote:
> Date: Mon, 29 Mar 2010 11:57:24 -0400
> From: Roger <sub1@rogerhalstead.com>
> Subject: Re: [Amps] 'good engineering'
>
>
> Zeitler, Lane LT, FST-1 wrote:
>
>> Better get busy constructing some heavy duty open wire feeders while you
>> are at to feed your antenna. I am thinking 8 gauge stranded would work
>> great, say, with 3 to 4 inch spacing.
>>
>>
> LMR-600 and 7/16ths connectors should do it through HF, or get some
> surplus 7/8" heliax. More than likely even PL259's would be sufficient
> for 5KW.
>
> 73
>
> Roger (K8RI)
>
>> Lane
>> Ku7i
>>
>
> ## for the record... it's called a '7-16 DIN' connector. It is NOT a
> '7/16" connector!
> The 7-16 means 7mm /16mm. The OD of the FEMALE that the PIN plugs into
> is 7mm [.284" ] The solid MALE PIN itself is of course, LESS than 7mm
> OD.
>
> ## There is No RF on the male pin anyway. Once mated, all the RF travels
> down
> the outside of the mating 7mm female. The braid /shield portion goes to
> the
> collet fingers of the mating FEMALE. The ID of this collet is a whopping
> 16mm.
>
> ## Then there is the actual threads.. which are way bigger than the inner
> collet.
> No rf on the big threads. The threads + inner female collet are ZERO DC
> ohms
> between em.
>
> ## years ago, Andrews announced they stopped making UHF connectors for
> 7/8" heliax !
> The only connector that is readily available for 7/8" heliax, and also
> LMR-1200 is
> either a type N.... Or a 7-16 DIN.... take ur pick. I hate type N's with a
> passion,most
> useless bloody thing devised for bigger cable. A 7-16 Din is a mid 60's
> German military
> design, that caught on fast. It's now used exclusively on all North
> American cell sites.
> We dumped the last of the type N's as of last summer. All the new gear
> has 7-16 dins.
> All our competitor's had already been using 7-16 dins. A 7-16 male plug
> for 7/8"...
> 1.25" or 1 5/8" heliax doesn't cost much more, if any.. compared to a Type
> N for the
> same size cable. What really looks silly, is a type N on a 1 5/8 heliax
> cable ! Here
> you have a connector the size of a coffee mug... with this tiny type N pin
> in the middle..
> which imo.. is just glorified BNC crap. The pin in a bnc is the same size
> as a type N.
>
> ## You can easily apply 5 x the torque on a 7-16 Din connector vs a
> type N for the
> same size cable. A 7-16 is good to 6 ghz. A type N is good to 12 ghz...
> and that's abt the
> only advantage of the type N. 2900 v rms vs 500 v rms.
>
> ## they make a bigger din too.. called a '13-30'
>
> ## The old LC connectors are going out of vogue. The LC chassis female
> connector is 2" square
> and uses 4 x 1/4-20 bolts. A 7-16 din is only 1.25" square.. and uses
> 4 x 8-32 machine screws.
> The type N / SO-239 is 1" square.
>
> ## 7-16 connector's are readily available on the surplus market these days.
> Lightning protection
> devices use a pair of 7-16 chassis dins in a box.. with a gas discharge
> tube inside. When the protector is
> doa, they toss em. You can buy the blown ones for $2.00...and remove the
> pair of 7-16 din female chassis
> connectors.
>
> later... Jim VE7RF
>
>
>
>
>
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