RG214U is available for $2/foot over at the RF Connection. I really like
those folks. So, judging by their web site (therfc.com), it's a stock
item. Not exactly cheap, but how many feet do you need for a
reharness project...
--STeve Andre'
wb8wsf en82
On Monday 10 July 2006 11:35, va7aa wrote:
> I agree with everything that is said about RG214... but the trick is to get
> some at a decent price... if you can get it at all. What jobber is gonna
> sell a guy 10 or 15' of RG214u cable that is hard to get in the first place
> ....special for his duplexer reharness project. You would have to get it
> from a mail order house at a small quantity premium, if they will sell a
> small lot at all. Does anyone on here have some to sell?
>
> I suggested brand new shiny RG8u because Sinclair are not idiots and have
> been using that stuff for years in their product$. You and I will probably
> be 6' under pushing up dasies, tweaken duplexers and filters in St. Peters
> presence before the next batch in your rehaness job starts to go skunky....
> then theres repeater hell... heh heh
>
> VA7AA
> ----- Original Message -----
> From: Jeff DePolo
> To: Repeater-Builder@yahoogroups.com
> Sent: Sunday, July 09, 2006 8:06 PM
> Subject: RE: [Repeater-Builder] RG-213 versus RG-214 in a Sinclair
> Duplexer
>
> > Every technical source I have indicates that the shield coverage on
>
> RG-214
>
> > is no better than RG-213 at 97% which doesn't make a lot of sense
>
> physically
>
> > unless the shield weaves are different for the two cables.
>
> The M17 spec for RG-214's shield is 95.7% for the inner braid and 98.0%
> for the outer. Here's the complete spec:
>
> Outer conductor: Double braid of AWG no. 34 silver-coated copper wire.
>
> Diameter: .360 inch maximum.
>
> Inner braid
> ------------
> Coverage : 95.7% nominal
> Carriers : 24
> Ends : 6
> Picks/inch : 16.6 +/- 10%
>
> Outer braid
> -----------
> Coverage : 98.0% nominal
> Carriers : 24
> Ends : 7
> Picks/inch : 15.4 +/- 10%
>
> When overlaid, the total shield coverage would be 99.914% if my math is
> right.
>
> The silver plating is what makes RG-214 advantageous over RG-213 in a
> duplex environment moreso than just the difference in braid coverage with
> respect to shielding effectiveness. Movement of the braid strands against
> each other doesn't make nearly as much noise with the silver plated strands
> of RG-214 as compared to bare copper RG-213. And as the cable ages and the
> braid strands tarnish (oxidize), the difference becomes progressively
> greater as silver oxide is a very good conductor unlike cupric oxide (or is
> it cuprous, I forget, cupric oxide is black-ish and cuprous is red-ish
> IIRC).
>
> Of course, the additional shielding effectiveness of RG-214 is also a
> good thing in terms of maintaining isolation in a duplexer harness or
> between cables running adjacent to each other.
>
> Phelps-Dodge used RG-8 and RG-213 in many duplexer interconnects (PD696
> and PD526 come to mind), but later changed to RG-214. I've replaced the
> cables on a number of these older duplexers picked up surplus and at
> hamfests with RG-214, not wanting to even take the chance on the old 20+
> year old RG-8.
>
> I have two VHF Wacom duplexers not presently in use. One says "Modified
> RG-214" on the coax, the other just says "RG-8". I presume the former is
> just double-copper-shielded RG-8. If I were to put either of them into
> service I'd change the harness without even giving it a second thought...
>
> --- Jeff
>
>
>
>
>
>
> ---------------------------------------------------------------------------
>---
>
>
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> 07/07/2006
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