Discussion in 'Homework Help' started by M.Obaidi, Aug 20, 2012.

1. ### M.Obaidi Thread Starter New Member

Aug 20, 2012
2
0
Hi Guys
I'm new here and i wonder if you can help me with my problem
i have a sheet of questions that i can't solve and i need your help to tell me the name of the book that these questions are brought from ..
i'll put one of them here and if you can solve it then give me the answer please or the name of the book.. thank you alot

Q. A typical open-wire telephone line has an attenuation of 0.0050 neper per mile at 1000 cps, while a typical loaded telephone cable has an attenuation of 0.050 neper/mile at this frequency. For Each of these lines, compute the lenght which will give an attenuation of 10 db.

Thanks

2. ### Ron H AAC Fanatic!

Apr 14, 2005
7,050
657
All you need is the conversion factor for Neper to dB, and a little math.

3. ### BillO Distinguished Member

Nov 24, 2008
985
136
1 Bel = 10 db = 1.1513 Neper

M.Obaidi likes this.
4. ### cork_ie Member

Oct 8, 2011
348
58
Out of interest folks - as Neper and dB are logarithmic units, does it follow that if there is X Neper attenuation/mile at a certain frequency that for n miles the attenuation is nX Neper? or is the math a little more complex than that?

5. ### steveb Senior Member

Jul 3, 2008
2,433
469
It's as simple as that, which is why people like logarithmic scales for measurements like this.

M.Obaidi and cork_ie like this.

Aug 20, 2012
2
0