[TowerTalk] rg-59 manufacturer

[Joe Subich, W4TV]

 > Since I wrote my original message, I found some additional 59-SP coax
 > that was purchased a year ago.  It exhibits the same 64-ohm impedance.
 > From this, there appears to be a more fundamental problem and not an
 > isolated batch problem.

I'd say the effective diameter of the stranded center conductor is a
bit larger than the solid center conductor and they did not change the
density of the dielectric to compensate.  That's nothing more than a
basic design error and goes to quality control.

73,

    ... Joe, W4TV


On 2015-02-15 8:04 PM, charlie carroll wrote:
> Jim:
> I'm not that far away from thinking the same thing.  However, I want to
> call the distributor tomorrow and see what they say.  They're well known
> in the ham community with a pretty good reputation.
>
> Since I wrote my original message, I found some additional 59-SP coax
> that was purchased a year ago.  It exhibits the same 64-ohm impedance.
>>From this, there appears to be a more fundamental problem and not an
> isolated batch problem.
>
> FWIW, I'm using the VNWA from DG8SAQ and ZPlot from AC6LA.  Great tools!
>
> 73 charlie, k1xx
>
>
> On 2/15/2015 7:52 PM, Jim Brown wrote:
>> I'd say that you have lousy coax from a cheapo manufacturer with poor
>> quality control, and toss it in the trash.
>>
>> 73, Jim K9YC
>>
>> On Sun,2/15/2015 3:11 PM, charlie carroll wrote:
>>> I have some rg-59 that I want to use for phasing a couple antennas in a
>>> low-power environment.  The 2 cables are marked as:
>>>
>>> S.I.W TYPE RG-59/U-SP-95  MADE IN U.S.A
>>>
>>> and
>>>
>>> S.I.W TYPE RG-59/U-P-95  MADE IN U.S.A
>>>
>>> I am looking for the manufacturer's data sheet to understand the
>>> differences and characteristics of the cables.  The cable marked "SP"
>>> actually has a stranded center conductor while the other is a solid
>>> center conductor.
>>>
>>> The big difference, however, is the impedance of the cable.  The "SP"
>>> measures in the 63-65 ohm range with a VNWA, depending on which of
>>> several I measure.  The solid-center version measures about 71 ohms on a
>>> single sample.  The velocity factor is in the .64 to .66 range on all
>>> cables.
>>>
>>> Is there anyone that can point me to some data?
>>>
>>> 73 charlie, k1xx
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