Short 75R connections - twisted or parallel run

fmak · 28th January 2006, 11:48 AM

What is the best way of connecting digital outputs up to 5 cm between board and bnc plug to avoid reflections?

Nigel Goodwin · 28th January 2006, 11:50 AM

If it's 75 ohm, I would suggest using 75 ohm coaxial cable - particularly as the BNC is designed for it.

BlackCatSound · 28th January 2006, 11:54 AM

Reflections come from impedance missmatches. Use the right impedance cable and connectors.

gmarsh · 28th January 2006, 12:00 PM

in extremely-vital-impedance situations, I just strip and solder coax directly to the PCB.

Jocko Homo · 28th January 2006, 01:57 PM

Belden makes a cheap coax that works ok, and is very flexible...........9210, I think.

RG-179......-184 (I think those are the right ones) work, but can be harder to work with.

Jocko

dnsey · 28th January 2006, 02:13 PM

Standard UK TV aerial downlead would be fine - not the cheap and nasty patchcord stuff though.

28th January 2006, 11:48 AM	#1
fmak diyAudio Member Join Date: May 2001 Location: London UK	Short 75R connections - twisted or parallel run What is the best way of connecting digital outputs up to 5 cm between board and bnc plug to avoid reflections?

28th January 2006, 11:50 AM	#2
Nigel Goodwin diyAudio Member Join Date: Jul 2005 Location: North Derbyshire	If it's 75 ohm, I would suggest using 75 ohm coaxial cable - particularly as the BNC is designed for it. __________________ Nigel Goodwin

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28th January 2006, 11:54 AM	#3
BlackCatSound diyAudio Member Join Date: Oct 2004	Reflections come from impedance missmatches. Use the right impedance cable and connectors.

28th January 2006, 12:00 PM	#4
gmarsh diyAudio Member Join Date: Apr 2004 Location: Halifax, NS, Canada	in extremely-vital-impedance situations, I just strip and solder coax directly to the PCB.

28th January 2006, 01:57 PM	#5
Jocko Homo Banned Join Date: Feb 2002 Location: As far from the NOSsers as possible	Belden makes a cheap coax that works ok, and is very flexible...........9210, I think. RG-179......-184 (I think those are the right ones) work, but can be harder to work with. Jocko

28th January 2006, 02:13 PM	#6
dnsey diyAudio Member Join Date: Mar 2004 Location: Shropshire, England	Standard UK TV aerial downlead would be fine - not the cheap and nasty patchcord stuff though.

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