c252-ag@cinna.berkeley.edu (James C. Lee) (02/06/91)
In <1991Feb5.064037.10135@macc.wisc.edu> Andrew wrote: > Oh, what are people's experience with the amount of RF given off by the > NeXT? How does it affect TV's and radios? Here's a non-scientific test. I have a Cobra cordless phone at home. In the past when I talk on the phone with either my IBM PS/2 or IBM clone on, some static noise was always present. However, to my pleasant surprise, having my cube on has *no* effect on the quality of the phone! Maybe the magnesium cases really does its work?! :-) --------------------------------------------------------------------------- James C. Lee, NeXT Campus Consultant - University of California at Berkeley email: jclee@cory.berkeley.edu Disclaimer: Unless otherwise specified, none of the above reflects the policies of NeXT Computer, Inc. Likewise, the above does not commit NeXT to any specific course of action nor can anything I say be construed as binding on NeXT. All opinions are my own.
rbp@investor.pgh.pa.us (Bob Peirce #305) (02/14/91)
In article <10819@pasteur.Berkeley.EDU> c252-ag@cinna.berkeley.edu (James C. Lee) writes: > >In <1991Feb5.064037.10135@macc.wisc.edu> Andrew wrote: > >> Oh, what are people's experience with the amount of RF given off by the >> NeXT? How does it affect TV's and radios? > >Here's a non-scientific test. I have a Cobra cordless phone at home. In >the past when I talk on the phone with either my IBM PS/2 or IBM clone on, >some static noise was always present. However, to my pleasant surprise, >having my cube on has *no* effect on the quality of the phone! Maybe the >magnesium cases really does its work?! :-) > I have a Panasonic phone with the transmitter/receiver on a desk above the cube. The cube does not affect this. However, I do get noise on the handset when sitting at the desk, a foot or so away from the receiver, the cube and the VDT. The cube is in a room with a lot of sensitive audio equipment, including a low output moving coil cartridge. There is no noticable noise on the audio system. I don't know if the noise on the handset is from the cube or the VDT. -- Bob Peirce, Pittsburgh, PA 412-471-5320 ...!uunet!pitt!investor!rbp rbp@investor.pgh.pa.us
cyliao@eng.umd.edu (Chun-Yao Liao) (02/17/91)
In article <10819@pasteur.Berkeley.EDU> c252-ag@cinna.berkeley.edu (James C. Lee) writes: > >In <1991Feb5.064037.10135@macc.wisc.edu> Andrew wrote: > >> Oh, what are people's experience with the amount of RF given off by the >> NeXT? How does it affect TV's and radios? NeXT is VERY "quiet" at RF. See, we have a tiny little room that I share with my roommate. He has a color TV. Since the room is so small, the TV set is only 1 metter and half. It never give any trouble to TV's reception. A while back, we started to experience interfarence... and my roommate was mad of me because I didn't agree to shut down my CuBE, Ok, so I finally shut my cube down in front of him, and guess what, the inteference continues. We found the origin of the interference later. It was from my modem! Yes! The little modem I have! it's only about 3x4x1 inch -- cyliao@bagend.eng.umd.edu o Q. Who am I? @wam.umd.edu o A. A NeXTed person with "small" HD and OD @epsl.umd.edu o An Apple // guy xxxxxx@xxxxxx.xxxx.xxxxxxx.xxx o An airplane pilot (I hope)
ifjrs@acad3.alaska.edu (STANNARD JOHN R) (02/18/91)
In article <1991Feb13.210116.25168@investor.pgh.pa.us>, rbp@investor.pgh.pa.us (Bob Peirce #305) writes... >In article <10819@pasteur.Berkeley.EDU> c252-ag@cinna.berkeley.edu (James C. Lee) writes: >> >>In <1991Feb5.064037.10135@macc.wisc.edu> Andrew wrote: >> >>> Oh, what are people's experience with the amount of RF given off by the >>> NeXT? How does it affect TV's and radios? >> I'm an Amateur Radio Operator running a packet-radio bulletin board. I've got four-to-five radios all running 24 hrs/day, a phone modem at least turned on most of the time; I'm running the TNCs (radio modems) on 2 cards in a 386 machine, and sometimes an external TNC as well. I also have an answering machine. This means that (when my NeXT is also on) I have two computers, two monitors, a phone modem, and usually 5 radios on. _Once_ in a while, if the phone modem is turned on but not on-line, I get a bit of heterodyne on one of the radios. Other than than, the only interference I'm getting is from the NeXT PRINTER! All these machines are within approx. 8 feet or closer--my tables are in an L-shape. As a result, when I first bring up the NeXT, I usually get into Shell and 'su,' then type: nppower off then exit. This, of course, turns off the printer until I have a need for it, and does away with any RF getting into my radios (or the other computer monitor, for instance). Incidentally, the radios are all grounded, the computer systems are NOT. You might want to try various grounding schemes to avoid any ground-loops. BTW, the radios (which transmit at various intervals) have not bothered the NeXT, either...the only time it did odd things (moved my cursor around a bit) to the MegaPixel Monitor was when I happened to have an inadvertant high SWR on one of the radios...when I adjusted that with a tuner, it stopped affecting my screen. Hope this helps alleviate any fears of the NeXT putting out any significant amount of RF (DON'T WORRY ABOUT THE FCC 'A' RATING! The 'B' rating is in the works, I understand...it just takes some time!). John -- John Stannard KL7JL@KL7JL IFJRS@ACAD3.FAI.ALASKA.EDU BITNET: IFJRS@ALASKA kl7jl.ampr.org "God is the Answer!" "Oh?? ... er, ...What was the Question?" --