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Lautus/Cusat review

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gwebster View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote gwebster Quote  Post ReplyReply Direct Link To This Post Posted: 04 Sep 2021 at 11:38am
I've now carried out the return loss and transmission loss measurements on the 1.5m long CuSat50 and Lautus cables Graham sent me. These were carried out using a Nano-VNA-F V2 vector network analyser.

Before each plot, the VNA was calibrated using the standard open/short/load/through procedure. The resulting plots are attached:

CuSat50


Lautus



I also ran a second set of plots for the Lautus using the CuSat within the calibration regime. This was done to normalise the plot relative to the CuSat and highlight any differences attributable to having the ferrites in place.


It's pretty clear that there's no visible difference between the two types of cable as far as any signal being transmitted through the cables. 

What I'm not able to do with the test gear available to me is look at the effectiveness of the cable screen with regard to externally induced RFI (cable screen outer boundary acting as an antenna). This is where the ferrites will really be having an impact. Looking into available methods to test this (Belden do it  this way) show that it could be done using a VNA by addition of a test setup to measure signal leakage in the other direction (from inside the cable and picked up on the outside of the screen). I'm afraid that's not something I'm going to be able to rig up.

I'm sorry that my tests aren't able to provide objective evidence to validate the benefits of the Lautus design. It was worth a try.

Inspire Apollo tt, O/L modded RB250, Ortofon 2M Black, Slee Different Approach inspired Phono, Putzeys Pre, Cusat, Raspberry Pi/Volumio, Bitzie, Self Load Invariant Power, Acoustic Energy AE509s
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Fatmangolf View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Fatmangolf Quote  Post ReplyReply Direct Link To This Post Posted: 04 Sep 2021 at 1:02pm
Thank you Geoff for doing this work and sharing the results clearly.
Jon

Open mind and ears whilst owning GSP Genera, Accession M, Accession MC, Elevator EXP, Solo ULDE, Proprius amps, Cusat50 cables, Lautus digital cable, Spatia cables and links, and a Majestic DAC.
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gwebster View Drop Down
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Post Options Post Options   Thanks (1) Thanks(1)   Quote gwebster Quote  Post ReplyReply Direct Link To This Post Posted: 06 Sep 2021 at 10:30am
Graham is using ferrites in the construction of Lautus cables as a means of suppressing interference from unwanted external, principally FM and DAB (and maybe mobile phone) emissions. This is a well known mitigation method against RFI and its certainly possible to demonstrate its benefits.

As an example, my son was experiencing the negative effects of the electrical noise environment within his house on his Ham radio setup (remote controlled radios and loft mounted antennas). By strategic use of ferrites on his cabling, he was able to significantly reduce the RFI impact. He was also able to visibly detect, measure and demonstrate the effects at each stage of his journey in mitigating the RFI impact.

While the affected signals he was interested in aren't in the audio spectrum, the RFI effect on the system is the same as Graham looks to mitigate for audio with the Lautus cables.

Geoff
BTW - I'm still looking at how we might get objective measurements with the Lautus cable to support their benefits 
Inspire Apollo tt, O/L modded RB250, Ortofon 2M Black, Slee Different Approach inspired Phono, Putzeys Pre, Cusat, Raspberry Pi/Volumio, Bitzie, Self Load Invariant Power, Acoustic Energy AE509s
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Aussie Mick View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Aussie Mick Quote  Post ReplyReply Direct Link To This Post Posted: 13 Sep 2021 at 5:39am
I understand that many people enjoy the engineering nitty-gritty of measurements, etc, but I’m still stuck, myself. Can someone who enjoys it please try to explain to me what it is about measurements that are exciting them? Is it as simple as the hobbyist enjoyment of the technical deep-dive? Or is it something more? I’ve never had a technical bent for electronics, but I’m an A1 nerd about woodwind reeds and acoustics. I suppose everyone has their thing. 
Cheers,
Mick.
Rega RP8 - Apheta 2 - Accession MC Enigma PS -Solo ULDE (Focal Utopia) - Proprius - PMC Twenty5.22
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