Best type of connection to maintain 75ohm - 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 26th February 2013, 07:27 PM   #1
diyAudio Member
 
john dozier's Avatar
 
Join Date: Dec 2010
Location: columbia sc
Default Best type of connection to maintain 75ohm

When using BNCs, what is the best type of connection to maintain true 75ohm empedence, crimp, compression, or solder? Thanks
__________________
Evil looms. Cowboy up. Kill it. Get Paid.
  Reply With Quote
Old 26th February 2013, 07:35 PM   #2
diyAudio Member
 
Join Date: Dec 2012
Location: The Jurassic Coast, England. GB
Send a message via Skype™ to JonSnell Electronic
A BNC connector is 50 Ohms.
  Reply With Quote
Old 26th February 2013, 07:42 PM   #3
diyAudio Member
 
john dozier's Avatar
 
Join Date: Dec 2010
Location: columbia sc
There are two types of BNC, one 50 and one 75ohm. Regards
__________________
Evil looms. Cowboy up. Kill it. Get Paid.
  Reply With Quote
Old 26th February 2013, 07:44 PM   #4
diyAudio Member
 
Join Date: Sep 2004
Location: UK
Hmmm!

BNC comes in 2 flavours, 50R and 75R. They are slightly different size, physically and mate best with different cables.

There is much room for confusion here! Some would say that for the very low speed in digital audio it would make not a jot of difference.

All conection types are designed to maintain the correct impedance, as far as it goes. Crimping is the neatest and easiest, but does mandate the matching cable to the connector.

Last edited by cliffforrest; 26th February 2013 at 07:47 PM.
  Reply With Quote
Old 26th February 2013, 07:45 PM   #5
diyAudio Member
 
Join Date: Dec 2012
Location: The Jurassic Coast, England. GB
Send a message via Skype™ to JonSnell Electronic
My appologies, we use BNC for 50 Ohm aerials on shipping. 75Ohm is usually a Coax Connector.
As long as the connection is good, the housing maintains the impedance. Personally I prefer solder but if carried out correctly, it makes no difference.
  Reply With Quote
Old 27th February 2013, 12:18 AM   #6
diyAudio Member
 
Speedskater's Avatar
 
Join Date: Sep 2002
Location: Lakewood, Ohio
As "cliffforest" wrote:
Some would say that for the very low speed in digital audio it would make not a jot of difference.
I'm one of those people.

I would also add "the short length of our connectors & cables"
__________________
Kevin

Last edited by Speedskater; 27th February 2013 at 12:20 AM. Reason: added content
  Reply With Quote
Old 27th February 2013, 12:42 AM   #7
diyAudio Member
 
Join Date: Jun 2011
Quote:
Originally Posted by john dozier View Post
crimp, compression, or solder?
It makes no difference to the impedance. BNC are often a combination of solder and compression, but you get crimp types too. Crimp is probably better for production line assembly and solder/clamp better for DIY.
  Reply With Quote
Old 27th February 2013, 01:06 AM   #8
diyAudio Member
 
Join Date: Nov 2011
Quote:
Originally Posted by john dozier View Post
There are two types of BNC, one 50 and one 75ohm. Regards
The 50 Ohm ones have a thicker centre pin.
Be sure not to use them with 75 Ohm sockets as you could spread the socket centre and make it unreliable for 75 Ohm connectors.
  Reply With Quote
Old 27th February 2013, 10:55 AM   #9
DF96 is offline DF96  England
diyAudio Member
 
Join Date: May 2007
The 'thicker central pin' claim is often made, but many deny it. There was a long debate about this a few years ago. I can't remember whether it was on here or a UK vintage radio site. I think the concensus was that the pins are supposed to be the same size, and the change in impedance is obtained by using less dielectric in a 75 ohm socket.
  Reply With Quote
Old 27th February 2013, 04:46 PM   #10
diyAudio Member
 
Join Date: Nov 2011
I have seen the thicker pin variety but this Wikipedia article supports what you are saying.

BNC connector - Wikipedia, the free encyclopedia
  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
True 75ohm RCA Type Plug Possible? commstech Digital Source 134 30th April 2013 09:09 AM
open baffles maintain better tonal balance in adjacent rooms otto88 Multi-Way 7 8th July 2011 09:20 AM
4N Silver 75ohm cable A&B-SYSTEMS Vendor's Bazaar 0 20th July 2010 09:01 PM
What is signal level/type at the USB connection? peace brainerd Digital Line Level 4 29th August 2009 07:58 AM
Sharing all my digital work - will downloaders pay to maintain diyaudio? cm Digital Source 44 25th September 2005 12:16 PM


New To Site? Need Help?

All times are GMT. The time now is 10:13 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