Date: Sun, 12 Jan 2020 04:44:01 -0600
From: Phil <pmills7@comcast.net>
To: towertalk@contesting.com
Subject: [TowerTalk] Need help estimating cable length of DXE 400 MAX
<I am involved in selling items to benefit the estate of a SK.
<One of the items is a unused roll of 400MAX cable that is still
<in the plastic cling wrap it was shipped in. I know there is
<at least 100 feet of cable there but I think there is possibly
<50 or even 100 feet more. I don't want to unroll the cable to
<measure it and get it all kinked or dirty. The roll weighs
<17 pounds. I've checked the DXE web site but can't find anything
<that gives the weight per foot. The roll is approximately 8 inches
<inside diameter, 16 inches outside diameter, and contains 55 to 60
<turns. The packing label on the roll says DXE400MAXDCU200.
<Can anyone help me with a good estimate of the length?
<thanks, 73, Phil W5BVB
## I use my B+K 875B digital LCR meter.....Mouser. Dead simple.
Measure the C between braid and center conductor.
## Divide total C by known C per foot.... = total length in feet.
## Coax maker will publish the C per foot. Even if they dont....
just cut EXACTLY ONE foot of cable off..... and measure the C.
## and yes, you can zero out the test lead stray C before hand.
## The above simple method is dead on vs a steel tape measure.
## The B+K 875B will measure capacitance to as low as .1 pf.....
in .1 pf increments..... and as high as 20,000 uf. It will also
measure inductance
to as low as .1 uh..... in .1 uh increments and as high as 200
Henries.
## It also measures AC resistance down to .001 ohms..... in .001
ohm increments.
## Im dead in the water without it, as its my number 1 piece of
test gear, constantly in use.
## The original B+K 875 is also an excellent unit. I bought one new
years ago.
## I used both of em, simultaneously to measure, and see if the pair
of motorized coils In my Seco systems
tornado drive track. They do.
Jim VE7RF
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