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From: mat@mtx5a.UUCP (m.terribile)
Newsgroups: rec.audio,sci.electronics
Subject: Re: Re: INTERCONNECTS
Message-ID: <1770@mtx5a.UUCP>
Date: Tue, 28-Apr-87 19:00:53 EDT
Article-I.D.: mtx5a.1770
Posted: Tue Apr 28 19:00:53 1987
Date-Received: Thu, 30-Apr-87 04:09:23 EDT
References: <18511@ucbvax.BERKELEY.EDU> <196@raster.UUCP>
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Xref: mnetor rec.audio:1431 sci.electronics:621

> I did some playing around with trying to measure differences between cables.
> Using a function generator, a 'scope, and an HP gain-phase meter (shows
> amplitude and phase differences between the two inputs), I connected the
> function generator to one input of the HP, and the cable under test between
> both inputs.  I also varied the terminating resistance, using 1k, 10k,
> 47k, and 100k resistors at the non-driven end of the cable.  I tried the
> following cables:  El Cheapo from Radio Shack, Monster Cable Interlink 2,
> Monster Cable Interlink 4, and "hardline" - essentially coax where the
> shield is a solid pipe (not braid) and is used for interconnects at
> gigahertz frequencies.  
> 
> The results?  NO MEASURABLE DIFFERENCES FROM DC TO 250K Hz.  The function
> generator wouldn't go any higher - hey, it was cheap, and all I could
> scrounge.
> 
> Now I have claimed to be able to hear a difference.  I couldn't measure
> any difference, though it _was_ a quick and dirty test and I didn't
> vary the output impedance of the source.  Anyone have any suggestions
> for a more thorough test?
> 
> ross

1) Have you tried it with a 60K source and 40K load?

2) What happens when you put 120 pf in parallel with the load?

3) What functions did you drive the thing with, and can the PGM pick
   up phase lag/lead at different frequencies?
-- 

	from Mole End			Mark Terribile
		(scrape .. dig )	mtx5b!mat
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