a very feasible idea. you really dont need transformer balancing (which i think the PPAs provide). impedance balancing will do it, and any dc 6 volt supply should work with the tetramic. i built john leonard a box wich provides stabilisied 5 volts, but i think you might get away without even that. A quad low noise opamp can provide reliable fixed gain. i am not sure, but is the sps 200 output balanced? umashankar
i have published my poems. read (or buy) at http://stores.lulu.com/umashankar > Date: Tue, 26 Apr 2011 12:02:03 +0100 > From: d...@york.ac.uk > To: sursound@music.vt.edu > Subject: Re: [Sursound] rf interference > > I'm _very_ seriously considering building an "extension body" for our > Tetramic, since the ppa's > annoy me intensely. This would be a metal tube of normal mic diameter (so > that standard clamps can > be used) with a nose cone into which the Tetramic would plug (and be clamped > somehow for additional > support). With a sufficiently smooth flaring on the nose cone I don't > anticipate having to > re-measure the Tetramic. The circuitry of the ppa's would be replaced with > preamps (perhaps with > switched gain) in the tube to bring the sensitivity up to SPS200 levels - and > the output plug would > be the same as on the SPS200 thus ensuring interoperability. All this, of > course, presupposes I can > find the time to do it! > > Dave > > On 17/04/2011 22:59, Fons Adriaensen wrote: > > On Sun, Apr 17, 2011 at 05:44:08PM -0400, Jascha Narveson wrote: > > > >> I was using the 6-foot extension cable yesterday. I didn't try it today, > >> so I can't comment on whether swapping out the cable today affected the > >> RFI, or if was just a different day and wouldn't've happened in any case. > > RF interference seems to be a recurrent problem with the Tetramic. > > I've experienced it on many occasions, and almost always leaving > > out the extension cable has removed or at least reduced the > > interference. But it leaves you with the four PPAs and four > > standard mic cables gaffer-taped to the mic stand - not a view > > most concert audiences do appreciate. > > > > I've been considering to modify the mic to have a short but more > > solid and better screened fixed cable terminating in a full-size > > 6-pin XLR, instead of the mini-xlr and the all too delicate > > extension and breakout cables. > > > > Ciao, > > > > -- > These are my own views and may or may not be shared by my employer > /*********************************************************************/ > /* Dave Malham http://music.york.ac.uk/staff/research/dave-malham/ */ > /* Music Research Centre */ > /* Department of Music "http://music.york.ac.uk/"; */ > /* The University of York Phone 01904 432448 */ > /* Heslington Fax 01904 432450 */ > /* York YO10 5DD */ > /* UK 'Ambisonics - Component Imaging for Audio' */ > /* "http://www.york.ac.uk/inst/mustech/3d_audio/"; */ > /*********************************************************************/ > > _______________________________________________ > Sursound mailing list > Sursound@music.vt.edu > https://mail.music.vt.edu/mailman/listinfo/sursound -------------- next part -------------- An HTML attachment was scrubbed... URL: <https://mail.music.vt.edu/mailman/private/sursound/attachments/20110426/c1dd4173/attachment.html> _______________________________________________ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound
