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why 50 ohm ?

 
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eladg



Joined: 13 Jan 2002
Posts: 205
Helped: 4
Post04 Dec 2003 18:19   why 50 ohm ?
why 50 ohm is use and at tv circu 75 ohm
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House_Cat



Joined: 21 Feb 2002
Posts: 1349
Helped: 274
Post04 Dec 2003 21:03   Re: why 50 ohm ?
This is a question asked frequently. There is quite a bit of information available on the internet.

Here are a few things to read in answer to your question:

h**p://www.reed-electronics.com/ednmag/index.asp?layout=article&articleid=CA60931

h**p://www.epanorama.net/documents/wiring/cable_impedance.html

h**p://www.trompeter.com/assets/product/PDF/wiring.pdf

(*=t above)
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cqmyg5



Joined: 21 Oct 2003
Posts: 137
Helped: 1
Post05 Dec 2003 1:36   Re: why 50 ohm ?
50ohm is a compromise between 30ohm and 75ohm.
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yuyu



Joined: 27 Mar 2002
Posts: 170
Post05 Dec 2003 12:13   Re: why 50 ohm ?
50 ohm is the best compromise between attenuation and power handling.
In fact at 30 ohm you have the max power handling instead at 77 ohm you have the min attenuation (that is important for TV cable).

Regards.
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hwswboy



Joined: 02 Jul 2001
Posts: 107
Post05 Dec 2003 13:24   Re: why 50 ohm ?
Read This.... (page 9)

Sorry, but you need login in to view this attachment
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