kraussW@batman.moravian.EDU ( SysAdm) (09/15/89)
I have a vintage Amiga 1000 which my father uses to manage his business out of our home. One unfortunate thing that we have found is that if the computer is on, the TV isn't because you can't see anything. (Note, they don't run cable where I live.) SO... Is there a reasonable way to add shielding to the Amiga's Interference or filter the antenna leading to the TV? (Which is two Rooms/Walls away.) Or is this a "deal with it the best you can" situation. (Please, no suggestions like, "A Two foot lead wall ought to do the trick.") :-) Thanks, Bill Krauss -- | William F. Krauss III | Moravian College, CompSci Dept, Bethlehem PA 18018 | | Computer Science Dept | CSNET/INTERNET -> kraussW@moravian.edu | | System Administrator | UUCP -> ...!rutgers!liberty!batman!kraussW | | Phone - 215-861-1441 | BITNET -> kraussW%moravian.edu@relay.cs.net |
Michael_Robert_Delany@cup.portal.com (09/22/89)
Many computers on the market have been known to cause RF interferance. The simplest protection against RF would be to make sure the system has a good ground -- this solution usually works well in most RF applications. If this doesn't solve the problem you might want to evaluate the coax and connections on your television(s). If you have 300 Ohm coax (twin lead) I would strongly suggest replacing it with 75 Ohm RG/58 or 59 coax and use a splitter/matching transformer on your tv set. The transformer/splitter is available at most hardware stores, Radio Shack and if one is close, electronic surplus stores for a couple of dollars. Relocation of the computer also may be a solution, if its not too much of an inconvenience, try this first if you haven't already.
mgardi@watdcsu.waterloo.edu (M.Gardi - ICR) (09/24/89)
We just purchased a GE cord-less telephone. The other day, I was playing Leader Board golf when the phone (in another room on the same floor) started ringing furiously. This was no RING... RING... RING..., but a continuous RRRRRRIIIIIIIIIINNNNNNNNNNGGGGG!. I started checking out the phone but it seemed to work properly, then I noticed that the ringing only occurred when the actual Leader Board screen was being displayed on the Amiga. When the game was being played, nothing happened. As soon as a round finished and the Board was displayed, the phone would go nuts. The system I'm using is a 500 with a Sub-system, and since Leader Board is dongle protected, the dongle was inserted properly. Anybody have any clues as to what Leader Board might be doing when this happens? Joe deSousa Mutual Life of Canada Waterloo, Ontario [C/O mgardi@watdcsu.waterloo.edu] [Please include the words "Att: Joe" in the subject line of any Email replies.]
karl@sugar.hackercorp.com (Karl Lehenbauer) (09/25/89)
In article <6369@watdcsu.waterloo.edu> mgardi@watdcsu.waterloo.edu (M.Gardi - ICR) writes: >We just purchased a GE cord-less telephone. >RRRRRRIIIIIIIIIINNNNNNNNNNGGGGG!. >...ringing only occurred when the actual Leader Board screen was being >displayed on the Amiga.... >Anybody have any clues as to what Leader Board might be doing when this >happens? Congratulations, you can now page your cordless phone from your Amiga :-) Well, the computer generates a lot of RF, and it's different based on what it's doing. To prove this, just get an FM radio, put it next to your computer, and tune it until you get a bunch of noise. Now run different programs, format floppies, etc. Wildly different sounds. It just happens that some combination of the program loop, data being displayed on the screen, etc, is generating the "right" RFI at a close enough frequency (or harmonic of the frequency) to make your rather stupid and unshielded (no offense) cordless phone freak out. -- -- uunet!sugar!karl "There is hopeful symbolism in the fact that -- flags do not wave in a vacuum." -- Arthur C. Clarke -- Usenet access: (713) 438-5018
bear@bucsb.UUCP (Blair M. Burtan) (09/25/89)
In article <22359@cup.portal.com> Michael_Robert_Delany@cup.portal.com writes: > > >Many computers on the market have been known to cause RF interferance. The >simplest protection against RF would be to make sure the system has a good >ground -- this solution usually works well in most RF applications. If this >doesn't solve the problem you might want to evaluate the coax and connections >on your television(s). If you have 300 Ohm coax (twin lead) I would strongly >suggest replacing it with 75 Ohm RG/58 or 59 coax and use a splitter/matching >transformer on your tv set. The transformer/splitter is available at most >hardware stores, Radio Shack and if one is close, electronic surplus stores >for a couple of dollars. Relocation of the computer also may be a solution, >if its not too much of an inconvenience, try this first if you haven't >already. If you're really ambitious, you could surround your machine with a grounded copper mesh. Kind of like in a microwave oven. The only catch is that you would be able to touch the keyboard. -- ----------- Signature Version 0.5 (aka Fine, be that way. )----------------- bear@bucsb.bu.edu bear@bucsf.bu.edu bear@buengf.bu.edu bear@bu-pub.bu.edu enge05c@buacca.bu.edu (Short enough for you?)