Re: Shielding, was: Constant buzzing - can it be killed!

["Kris Hartung" <khartung@q.com>]

I'll try to do an experiment this week, Bill, and run my system with all 
the 
wireless routers and sattelite TV gear off.  I was thinking something 
similar.

Here at my house, we have a wireless router for internet, plus two relay 
routers that expand the reach.  Then we have three separate wireless LAN 
phones, all running on different frequencies.  Then we have a separate 
wireless system for the TV system, which connects it to the laptop, etc.

Our house is a literal bath of wireless frequencies. I am wondering if all 
that, with my guitar mag pickup, is part of the problem.

I'll let you know if the isolation transformer I bought solves the problem.
Kris

----- Original Message ----- 


>I have been trouble shooting a noise problem of my own recently that  has 
>finally been identified, after much consternation that I thought  I'd 
>share 
>even though it may not be directly applicable to Krispen's  recent 
>issues. 
>For the past several months I have had an intermittent   high frequency 
>noise issue that only manifested when I was recording  1/2 speed loops on 
>the looperlative. I'd record content and get this  High frequency whine, 
>embedded in my loops that would go away when I  toggled back to normal 
>speed. My initial thought was it was the LP-1,  but like I said this 
>wasn't 
>happening all the time and only at home,  which made wonder if it was 
>something else instead. Today after I got  home from rehearsal I set my 
>rig 
>back up and started playing and  looping at half speed and low and behold 
>the whine was back. I first  tried turning off the computer that wasn't 
>in 
>use thinking perhaps its  wireless might be the culprit. Nope, The i 
>realized my wife was in the  other room, nursing a cold and watching TV. 
>last October we switched  to Direct TV. I asked her to turn off the TV 
>and 
>DTV router, and then  recorded another loop. The noise did not 
>re-appear!! 
>Something in the  router or dish was adding interference, and its at the 
>opposite corner  of our house. I tried the test twice to make sure.  This 
>has gotten me  thinking about two things,  Dish TV and microwaves in 
>general might be  causing others to have noise and interference issues., 
>and that so  much of the electric gear we use requires wall wart style 
>power  supplies which are not particularly well shielded and may be 
>potential  conduits for this type of interference. I've had other 
>interference  from time to time from neighbors with high speed power 
>tools 
>and a  sculpture neighbor with an arc welder.  So what to do?, I'm 
>seriously  considering an isolation transformer and I'm wondering if 
>anyone 
>might  know if bunching wall warts together might perhaps increase noise 
>issues? I've though about building a shielded box to put them all in  or 
>find some steel army surplus box to stick them in.  I don't know if  I'm 
>barking up the wrong tree with that idea. I have no electronics  
>education 
>to speak of other than knowing not to stick a fork in to a  wall socket.  
>I 
>also wonder if its possible to adequately shield wall  warts?  I'm also 
>investigating which of the new crop of multiple power  supplies from 
>Voodoo 
>labs Dunlop and T rex might be able to handle the  higher voltage and 
>milli 
>amps of my rack gear that requires power  supplies. I have an older pedal 
>power plus from Voodoo that works  great with my regular pedals. I'd just 
>as soon jettison as many wall  warts as I can if possible.
>  Any suggestions would be much appreciated.
> Bill
>