[Antennas] How to calculate cable length

[Chris Boone]

Forgot basic math????
 
Circumference of a circle is 3.14 (pi) x diameter.....so if you know
diameter of spool (the actual wood the cable rests on, not the outside
circle), count number of turns, multiply the two and then multiply x 3.14,
you'll get close (on the low side of the actual length actually but better
than being long and wrong)

(Don't sign up for FOX's "Are You Smarter than a 5th grader?" This is a
basic question)

ALSO most CATV cable is marked in Meters or feet on the cable....look for
number increasing or decreasing...if you see the end that sticks out of the
inside the reel, chances are you can actually see the real numbers on both
end and figure the length....

Chris
WB5ITT

> -----Original Message-----
> From: antennas-bounces at mailman.qth.net 
> [mailto:antennas-bounces at mailman.qth.net] On Behalf Of 
> Charles E. Pitts
> Sent: Sunday, March 23, 2008 2:56 PM
> To: antennas at mailman.qth.net
> Subject: [Antennas] How to calculate cable length
> 
> Hello all, I am requesting help in calculating the amount of 
> cable length in feet that I have from catv cable reel ends.
> 
> I have numerous rolls of reel ends of both insulated (burial) 
> and non insulated (aerial) catv hardline that I plan on using 
> primarily for HF work.
> 
> I have heard somewhere and I can not remember from where or 
> from who that if you count the number of turns and multiply 
> that times the diameter of the actual spool you can get an 
> approximate amount of feet remaining on spool?
> 
> Is that correct or does somebody out there who has had a 
> similar situation and has encountered an unknown amount of 
> cable, etc. have a more definitive way of determining the 
> amount of cable or wire one may have that is on a spool?
> 
> Unfortunately I have no access to equipment that may help me 
> as I am in the process of building a new home and 
> establishing my future antenna farm and getting ready to pull 
> the cable I have to the tower site, etc.
> 
> Some, if not most of the insulated cable I have on hand has 
> had the #'s faded  which may tell you on the spool the # of 
> feet left, and is unreadable and is of no benefit.
> 
> Thus the reason for me finding out another way of calculating 
> the # of feet remaining.
> 
> Thanks in advance for all responses, Ed K5OF in NC