cable lenght meter

Have an idea? Post it here! - Looking for developers? Ask here as well!
Post Reply
muratcoskun
Posts: 1
Joined: Tue Jan 08, 2019 8:19 am

cable lenght meter

Post by muratcoskun » Tue Jan 08, 2019 8:23 am

Hi everyone

İ need a cable lenght meter but i dont have any idea about how can i do it ?

it need to measure the length of the non-powered cable and display the coordinates and cable length online. ( it will worked by GSM)
it will be able to do the measurement at regular intervals or when I want.

i want to see online For example:

Cable Number :2 Lenght: 445,3m coordinate : 49.015577, 5.710104 Time : 03:22 PM

is there someone who can help me ?

User avatar
ElectroNick
Posts: 3
Joined: Tue Dec 04, 2018 10:28 pm

Re: cable lenght meter

Post by ElectroNick » Tue Jan 08, 2019 10:25 pm

Just brainstorming:

Getting a serial gps unit and connecting it to the RP is the easy part.
now for the hard part: assuming you have access only to one cable end;
I would get also a Low freq RF directional coupler. connect it properly to the cable, RF in and RF out;
sweep the frequency range and plotting what is the return signal. I would start from this idea. Basically I would use the cable as an antenna, since I do not know what frequency it has, I sweep the hole range and I see where It resonates. The issue I'm afraid is like for instance, 445m would translate to a resonance of 0.00224719101 Hz, witch is weird. No.
I think a better idea is to send a pulse and wait for the echo. Like this user here:
do a gogole or youtube search for "#37: Use a scope to measure the length and impedance of coax"
He used the oscilloscope and pulse generator.
Good luck! - and please let us know your progress

Post Reply
jadalnie klasyczne ekskluzywne meble wypoczynkowe do salonu ekskluzywne meble tapicerowane ekskluzywne meble do sypialni ekskluzywne meble włoskie

Who is online

Users browsing this forum: No registered users and 5 guests