I'm one of the other Bob's or Robert's........
Since the assembly of coax wound around a toroid doughnut style bobbin
is typically not exposed to vibration, such as might exist in an
airplane, boat or space vehicle, the use of a solid conductor coax such
as RG-303 would not seem to be of concern. The more important point and
my experience and as related by others, the use of coax which has foam
dielectric in a tight radius bend has been proven or shown to be
problematic. As to if the manufactures bending radius dimension is
being violated, I find to be of little concern.
After all, as a rule, hams are noted for pushing things to the limit and
then some and getting buy with it. If hams choose to "stick to the
rules 100% in all aspects of their stations"............I'd say 75% of
the stuff we use and methods employed would put most of the station
stuff in the trash.
73
Bob, K4TAX
On 2/9/2016 8:45 AM, Guy Olinger K2AV wrote:
Hi Bob, et al,
Thank you all for your careful attention.
I read it wrong, as several have pointed out overnight. I transposed that
to a percentage in my memory after reading it. One of the reasons for
referring people to the original material in these cases. Someone will get
it right.
That makes it two and a half hairs :>) Doesn't appear to change the
argument. To me anyway the method is still a crude measurement instead of
watching a wide frequency scan while bending the cable along with other
performance specific measurements.
I still would not use the solid center conductor versions (RG142/303) on a
winding.
73, Guy K2AV
On Tuesday, February 9, 2016, Robert Nobis <n7...@nobis.net> wrote:
Hi Guy,
I am not sure how you arrived at the “2/1000 of an inch” figure from the
ANSI spec? The spec actually says “A change in ovality from a given
sample’s initial measured value of 0.010 inches or more (> 0.010)
represents the point of non-acceptable bending performance.”
73,
Bob Nobis - N7RJN
n7...@nobis.net <javascript:_e(%7B%7D,'cvml','n7...@nobis.net');>
On Feb 8, 2016, at 18:01, Guy Olinger K2AV <k2av....@gmail.com
<javascript:_e(%7B%7D,'cvml','k2av....@gmail.com');>> wrote:
I also suggest that everyone carefully study the ANSI standard until it is
clear what they are doing mechanically and see what they are actually
measuring:
http://www.scte.org/documents/pdf/standards/ANSI_SCTE%2039%202007.pdf
The method of measuring is in section 4. They are looking for a limit of
1% surface deformity when bending.
In the case of RG400 with .195 inch OD, that would be 2/1000 of an inch
(yes, that's three zeros, two one thousandths of an inch) bending deformity
at the surface of the teflon jacket, or half the thickness of an average
human hair.
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