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Lautus/Cusat review |
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Graham Slee
Admin Group Retired Joined: 11 Jan 2008 Location: South Yorkshire Status: Offline Points: 16298 |
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I've observed voltage standing waves while looking for differences between identical length CuSat50 and Lautus cables, but to no avail as the signal generator only goes to 20MHz. Fun to watch apparent gain from wire, but it cannot prove my intentions. I'm afraid theory isn't good enough, unless it's an adopted theory, but mine isn't.
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That none should be able to buy or sell without a smartphone and the knowledge in how to use apps
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gwebster
Senior Member Joined: 04 Oct 2014 Location: Liss, UK Status: Offline Points: 175 |
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The Vector Network Analyzer my son has will sweep from 50kHz up to 2GHz. All he would need is a cable with RF type connectors (N-type or SMA) in place of RCA/Phono and could run a cable test across those frequencies to get meaningful measurements. Worth pursuing?
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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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Graham Slee
Admin Group Retired Joined: 11 Jan 2008 Location: South Yorkshire Status: Offline Points: 16298 |
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I've no idea what results he'll get but if BNC's are acceptable, I can supply adaptors, then it will be a complete test. John C is stand-in UK loan coordinator, so I can ask him to send a mono of each.
And if that doesn't tell us anything, then the difference must be a figment of our imagination
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That none should be able to buy or sell without a smartphone and the knowledge in how to use apps
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jwatson
Regular Joined: 07 Nov 2016 Location: Riyadh, KSA Status: Offline Points: 98 |
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How are you measuring the VSWR at the moment? The addition of Ferrites to a coaxial cable can be an effective way to suppress common mode currents but would have little effect on the differential currents measured when determining VSWR of a cable/load in a conventional VSWR measurement.
Any measurement would obviously have to take into account the differences in impedances between the 50ohm VNA and the 75ohm audio cable/connectors used in hifi interconnects. For a short lengths of good quality cable like this, I would expect that the effects of mis-matches at the adapters/cable terminations to dominate the results. |
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"I bought some more old vinyl today 'cos old vinyl won't ever let you down"
Majestic DAC -> {Proprius -> Tannoy Stirling | Solo UL -> HD820} |
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Graham Slee
Admin Group Retired Joined: 11 Jan 2008 Location: South Yorkshire Status: Offline Points: 16298 |
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I'm not. Like I said "fun to watch..." It doesn't explain a damn thing, and unless I can measure some attenuation at 100 and 200 MHz, then it's completely subjective, and I would be happy to leave it like that. However, suitably equipped members here can have a go and I'm happy to loan them the cables.
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That none should be able to buy or sell without a smartphone and the knowledge in how to use apps
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gwebster
Senior Member Joined: 04 Oct 2014 Location: Liss, UK Status: Offline Points: 175 |
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BNC is fine, son has adapters to take that to the SMA(F) ports of the VNA. Shall I PM John with contact details? PS Apart from son being radio ham, his day job is Sat-coms design (airborne, mobile, fixed), so should be able to get something meaningful from this exercise
Edited by gwebster - 16 Aug 2021 at 1:44pm |
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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
Moderator Group Joined: 23 Dec 2009 Location: Middlesbrough Status: Online Points: 8960 |
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Thanks for persevering with this. Your son's equipment sounds just the ticket.
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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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