hi ALL,
I wanty know , if exist 150 ohms..
The old twinax computer cabling used in AS400 systems: 150 Ohm Twinaxial Cable from Allied Wire and Cable, Distributor of Belden Cable
Well, I did wonder but surely nobody could be that daft? That would mean that some people fret over exactly which BNC they use, while someone else happily uses a 300ohm 'balanced' line. It is fortunate the digital audio signals are so robust!marce said:Possibly separating the signal and its return path,
Thinking about this further (the mention of S-VHS cable threw me) are we talking about:
Twisted pair within a shield or
two co-ax cables within a single shielded cable?
S-VHS used the latter, but the first can be used for balanced signals and digital LVDS
Ihave to explain better,perdone me and my bAD ENGLISH: I WANT USE ONLY THE "core-SOLID", ONE FOR GO AND ONE FOR RETURN.
tHE SHIELD IS ATTACHED ONLY ONE PART ON THE NEGATIVE POLE...
I HOPE TO BE MORE DECENT CLEAR NOW!
BY
Ihave to explain better,perdone me and my bAD ENGLISH: I WANT USE ONLY THE "core-SOLID", ONE FOR GO AND ONE FOR RETURN.
tHE 2 SHIELDs ARE "ATTACHED- LINKED" ONLY ONE PART ,ON THE NEGATIVE POLE. ONLY...
I HOPE TO BE MORE DECENT CLEAR NOW!
BY
No, its less clear now. You seem to want to use the inners of a 150 ohm coax for both signal and return, with the two shields grounded. If I understand correctly you want to make a 300ohm balanced circuit. If so, why not use 300ohm twin cable? Why not tell us what you want to do then we can advise you how best to do it.
inertial,
Se this excellent video: Use a scope to measure the length and impedance of coax - YouTube
Watch what happens with the signal when impedance mismatch occurs.
http://www.youtube.com/watch?v=Il_eju4D_TM
Se this excellent video: Use a scope to measure the length and impedance of coax - YouTube
Watch what happens with the signal when impedance mismatch occurs.
http://www.youtube.com/watch?v=Il_eju4D_TM
The Henry Ott picture from:
http://www.hottconsultants.com/pdf_files/aes-2007.pdf
refers to balanced audio, for digital signals this would not work, using a twisted pair within a shield would work, using one for the signal and one for the return, though you then have the problem of terminating the shield correctly, otherwise you are prone to RF pick up or emitting.
http://www.hottconsultants.com/pdf_files/aes-2007.pdf
refers to balanced audio, for digital signals this would not work, using a twisted pair within a shield would work, using one for the signal and one for the return, though you then have the problem of terminating the shield correctly, otherwise you are prone to RF pick up or emitting.
- Status
- This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.
- Home
- Design & Build
- Parts
- COAX " cables antenna"