In a message dated 11/14/2006 4:39:27 P.M. Pacific Standard Time,
wc1m@msn.com writes:
>> Wow, that's sure different than my findings. I did the same thing with a
recently calibrated Dillon several years ago for my tower column in CQ
Contest magazine and they were within a couple of percent of each other.
> It might depend on what size cable you measured, how far up the scale you
went and which model Loos you used. My readings apply strictly to 1/4" EHS
measured with the PT-2.
> But the reason I used the Dillon is that there was a Tower Talk thread on
this subject a while back in which several people said they conducted
similar experiments and found that the Loos gauge readings varied depending on
the
type of cable material. The Loos depends on flexing the cable and is
calibrated for only one kind of material: stainless steel marine cable. EHS
has
different bending characteristics, and this affects the readings enough to
make a
difference. As I recall, W8JI was involved in the discussion.
Well, when you tension any wire rope it becomes more rod-like, so as far
as the Loos goes, it can't tell the difference what you're measuring. My
calibration experiment took 3/16" EHS, 3/16" galvanized 7x19 and HPTG4000
Phillystran all connected in one length and tensioned with a recently
calibrated
Dillon gauge to 400 pounds and they all read the same with the Loos - within a
couple of percent of the 400#.
Cheers,
Steve K7LXC
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