[Elecraft] OT trying to identify "mystery" coax cable

[Jack Smith]

RG9 (or its modern version, RG-214)  has two woven shields of silver 
plated copper.

Jack K8ZOA


On 4/13/2011 2:08 PM, Ken Roberson wrote:
> Lew,
>
> Look up RG9 I think it 52 OHM coax that has two shields.
>
> 73 Ken K5DNL
>
> ----------------------------------------------------------------------
>
>
> --- On Wed, 4/13/11, Lew Phelps K6LMP<k6lmp at me.com>  wrote:
>
>> From: Lew Phelps K6LMP<k6lmp at me.com>
>> Subject: [Elecraft] OT  trying to identify "mystery"  coax cable
>> To: "Elecraft Reflector"<elecraft at mailman.qth.net>
>> Date: Wednesday, April 13, 2011, 11:58 AM
>> I was browsing through the local
>> Salvation Army Thrift Store (where I sometimes go looking
>> for low-priced antique treasures), and stumbled across a
>> 50-foot length of RG-8-type coax cable. At the asking price
>> of $6.00, I couldn't pass it up.
>>
>> It has Amphenol male "UHF" connectors. And absolutely NO
>> markings on the cable itself indicating manufacturer or
>> type. The OD of the cable varies from point to point, but
>> averages about .405 inch, which puts it in the RG-8b family.
>> It is quite flexible, and clearly stranded center conductor,
>> not solid.   Capacitance of the 50 foot cable
>> was measured 1155 pF, or 23.1 pF per foot, which eliminates
>> some RG-8 flavors that have 30 pF per foot.  The only
>> distinguishing feature of the cable is that there appears to
>> be a wire would spiral-wise (1/2 turn per inch) outside the
>> standard foil shield and under the exterior rubber
>> sheath.  I've never need that construction before on
>> any RG-8 cable.  (I haven't cut it open to verify the
>> construction, because I don't want to have to de-solder and
>> reconnect the Amphenol connector.)
>>
>> I attached the cable to my dummy load and to the HF output
>> of my K3.  Keying the transmitter at 12 watts produces
>> an SWR of 1.05:1 (external SWR meter) on all bands up to 6
>> meters, and continuity checks confirm that the cable has
>> neither short circuit between shield and cable nor open
>> circuit.  In other words, it appears fit for duty.
>>
>> Two questions;
>> 1. Anything else I can or should do to check the cable and
>> make sure it's OK to use?  (Unfortunately, I do not own
>> or have access to an antenna analyzer.) 
>> 2.  Based on the "spiral winding" between the shield
>> and outer coverk does anyone have an idea what specific
>> cable this might be?
>>
>> Thanks, and 73
>>
>> Lew K6LMP
>>
>>
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