From: "Terrell W. Fritz"
Date: Sun, 29 Oct 2000 09:40:08 -0700
Subject: Re: [TSSP] NSVPI - Latter Results
Hi, At 02:48 PM 10/29/2000 +0000, you wrote: >Malcolm wrote [referring to the sonotube loss discovery]: >> That is an encouraging find. I think it lends some credence to >> the kinds of Q's I was measuring on both the PVC and HDPE >> coils. It means that very good coils can easily be built. > >Malcolm, I don't think there's any doubt that the kind of Q >factors that you were measuring are typical, my coil(s) too >give a Q in the several hundreds. Terry's big LTR is unusually >lossy but the noteable point is that it does not really hamper >performance in the disruptive system. My guess is that if an >identical coil but with a high Q was substituted, the performance >would only be a few percent higher. snip... I ran a MicroSim model with the secondary resistance at 391 ohms and then at 100 ohms to see what kind off effect a low loss secondary may have. The streamer power went from 242 watts to 264 watts or about a 9% improvement in power. That translates to about a 4.5 percent increase in streamer length. Cheers, Terry
Maintainer Paul Nicholson, paul@abelian.demon.co.uk.