i use a digital 75ohm RCA to RCA cable between my NDX and Hugo using a BNC to RCA adaptor. I thought i would try a BNC to RCA cable to see if the adaptor was degrading the sound.
Anyway this got me thinking, exactly what does the 75ohm refer too. does the cable have a 75ohm resistor in it. No. So what makes it 75ohm??
So i have a 50cm length of RG59 75ohm coax cable with a BNC on one end and have soldered an RCA connector on the other end.
Is this safe to use or could it damage the NDX or Hugo.
Graeme
Posted on: 27 December 2014 by Foxman50
Hi Erich
many thanks for the link, interesting reading, who new there was so much to a piece of cable. Think i will try it out tomorrow and see how it sounds. Would i be correct in assuming that it would be safe to try almost any piece of cable at such a short length, even though as you say it may not be optimal.
Graeme
Posted on: 27 December 2014 by Gale 501
If money is tight and you want a really great sounding well made BNC to RCA coax digital cable?
Look on the Mark Grant site.
I cant hear any difference between Marks £32 cable and naims DC1.
I am a bit mutton though. 
Posted on: 28 December 2014 by Simon-in-Suffolk
Hi Graeme, what I couldn't see in the wiki article that is relevant for us and I think a lot of people forget is the CI (characteristic impedance) of the connector itself. A BNC plug and socket can be designed to have a CI of 75 ohm whereas because of its geometry an RCA can't. Therefor an optimum SPDIF coaxial connector will use BNC both ends.
However because the frequencies we use are relatively low and the power we use is extremely low, the impact of reflections that occur when there is a CI mismatch are limited. I also consider that the extensive use of reclocking technology these days minimises or eliminates the impact of reflection interference modyfying the waveform.
Simon
Posted on: 28 December 2014 by Foxman50
Hi Simon
As usual with this stuff it goes over my head, but if i look at a BNC and RCA connector, while they are clearly different they are not so different in physical style.
Its the 75ohm bit that gets me, but think I'm thinking of resistance and not impedance.
Will give a try soon, ill be interested to see if i can hear any difference.
Graeme
Posted on: 28 December 2014 by pete T15
Hi Graeme .
I had the same quandary a couple of of months ago and ended up buying a Chord Signature BNC-RCA which can be specified to fit the Hugo , the difference was very impressive compared to the TQ blue digital RCA i was using before with an adapter . I'm sure losing the adapter has made a difference but the Chord i demoed at home was RCA -RCA with adapter and gave a similar improvement, i wouldn't hesitate in buying it again .
Peter.
