True 75ohm RCA Type Plug Possible? - Page 2 - diyAudio
Go Back   Home > Forums > Source & Line > Digital Source

Digital Source Digital Players and Recorders: CD , SACD , Tape, Memory Card, etc.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 28th July 2005, 09:03 PM   #11
diyAudio Member
 
jneutron's Avatar
 
Join Date: Jan 2004
Location: away
Default Nope, sorry. You are incorrect.

Show me, via equations, why it is not so.

Then, I will take those equations, and provide the derivation which indeed, shows that it is possible..

And, I will not need to resort to a word indicative of the effort required for reproduction.

Cheers, John

BTW, in looking at that canare part, I don't think they did..
  Reply With Quote
Old 28th July 2005, 09:05 PM   #12
Banned
 
Join Date: Dec 2001
Location: Zamboanga, City of Flowers, Mindanao
Send a message via Yahoo to Elso Kwak
Quote:
Originally posted by Jocko Homo
No, it is not ****ing possible.

Jocko
That 75-Ohm RCA plug is a Canard!
Attached Images
File Type: jpg canard.jpg (9.2 KB, 690 views)
  Reply With Quote
Old 28th July 2005, 09:11 PM   #13
homer09 is offline homer09  Canada
diyAudio Member
 
homer09's Avatar
 
Join Date: Jan 2004
Location: Montreal
Default Re: It is absolutely possible. Sorry, carlos..

sorry for the noob question, by why is 75 ohm impedence a good thing?


Quote:
Originally posted by jneutron


There is a more elegant solution which affords far higher bandwidth impedance match. But to introduce it would undermine all the wbt product, obsoleting it entirely. And, it costs far too little to be a niche product, better as an OEM one..

Cheers, John

what is this solution you speak of?
__________________
Most people wouldn't know good music if it came up and bit them in the ***. - Frank Zappa
  Reply With Quote
Old 28th July 2005, 09:19 PM   #14
diyAudio Member
 
jneutron's Avatar
 
Join Date: Jan 2004
Location: away
Default Re: Re: It is absolutely possible. Sorry, carlos..

Quote:
Originally posted by homer09
[B]sorry for the noob question, by why is 75 ohm impedence a good thing?
It's a rf reflection thing.. When a signal travels down a transmission line, if it meets a discontinuity of impedance, some of the signal will reflect back towards the transmitter. For long lines, this can cause signal degradation.

75, of course, is just a standard..I did know why it was selected, but have forgotten what it was..I think it was the line impedance necessary for a 1/4 wave transformer between a 300 ohm line and a 50 ohm line, but I'm not quite sure about that.

Quote:
Originally posted by homer09
what is this solution you speak of?
I am not at liberty to divulge that yet.

However, the solution which was created by WBT, I can most certainly detail at length..

Cheers, John
  Reply With Quote
Old 28th July 2005, 09:25 PM   #15
homer09 is offline homer09  Canada
diyAudio Member
 
homer09's Avatar
 
Join Date: Jan 2004
Location: Montreal
thanks john.

if the BNC is a simple solution to the problem, why aren't more diyers using these?

second of all, there are tons of interconnect cable recipes out there, i doubt most of them are 75ohm, does this make them inferior?
__________________
Most people wouldn't know good music if it came up and bit them in the ***. - Frank Zappa
  Reply With Quote
Old 28th July 2005, 10:25 PM   #16
Banned
 
Join Date: Feb 2002
Location: As far from the NOSsers as possible
Equations............?

How 'bout you have to increase the inductance by about a factor of 8 to make it work.

On paper.

An XLR is a 110 ohm connector. It even measures 110 ohms. It is totally useless in the RF world.

Experience trumps your silly equations. Sorry, bub.

Jocko
  Reply With Quote
Old 29th July 2005, 12:20 AM   #17
Banned
 
Join Date: Mar 2003
Location: Lisbon, Portugal
Quote:
Originally posted by jneutron
Show me, via equations, why it is not so.
Then, I will take those equations, and provide the derivation which indeed, shows that it is possible..
Aaaahhhh, that's a good one.

Let's think, shall we?
Look at an F plug. It's 75 ohms, the center pin is from the cable.
Now look at the center pin of an RCA plug. Much thicker, isn't it?
So, the ground should be much more far apart than on a standard RCA.
Why on earth would impedance change (so much) just by cutting the ground contact in 3 parts?
And the internal connection of the plug to the wire?
  Reply With Quote
Old 29th July 2005, 07:18 AM   #18
Gasho is offline Gasho  Croatia
diyAudio Member
 
Gasho's Avatar
 
Join Date: Nov 2004
Location: Zagreb
Why people "must" use RCA for fast signals and 75ohm connections , when there is BNC which is made yust for that purpose.
  Reply With Quote
Old 29th July 2005, 07:29 AM   #19
diyAudio Member
 
Join Date: Oct 2002
Location: SINGAPORE
Quote:
Originally posted by Gasho
Why people "must" use RCA for fast signals and 75ohm connections , when there is BNC which is made yust for that purpose.
this is what i have been wondering -- why manufacturers of equipment been using RCA instead of BNC, which is the proper termination?
  Reply With Quote
Old 29th July 2005, 07:37 AM   #20
Gasho is offline Gasho  Croatia
diyAudio Member
 
Gasho's Avatar
 
Join Date: Nov 2004
Location: Zagreb
Wee will never know

Maybe RCA is 0,1% cheaper
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Can I convert 200ohm analog audio into 75ohm? The Paulinator Analog Line Level 9 3rd August 2007 08:22 AM
WTB: 2.5mm plug to 3.5mm plug cable Relax Swap Meet 5 10th February 2007 12:13 AM
Re : BL type & GR type of transistor for Aleph-Ono Arion Pass Labs 4 29th January 2007 06:15 PM
Details of the 75ohm impedance of S/PDIF for short distances. Garbz Digital Source 4 7th August 2005 10:51 PM
Where to get a 25 pin plug? Jye Parts 5 14th February 2005 04:26 AM


New To Site? Need Help?

All times are GMT. The time now is 12:35 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2