psfales@cbnewsc.ATT.COM (Peter Fales) (11/27/89)
In article <2261@jato.Jpl.Nasa.Gov>, lyman@jato.Jpl.Nasa.Gov (Peter T Lyman) writes: > My unix-pc does a *power-on-reset* anytime I key my 220 Mhz handheld > unit, (in the same room). This does not happen with a 144 Mhz radio > nor a 440 Mhz radio. > > Is there any body out there with the same/simular experience? I have had the same experience with a 144MHz handheld, though it only happens when the radio is within about three feet of the computer. It appeared (though I didn't want to experiment too many times trying it out :-) that the power supply was shutting down while the transmitter was being keyed. -- Peter Fales AT&T, Room 5B-420 N9IYJ 2000 N. Naperville Rd. UUCP: ...att!ihlpb!psfales Naperville, IL 60566 Domain: psfales@ihlpb.att.com work: (708) 979-8031
thad@cup.portal.com (Thad P Floryan) (12/04/89)
Re: the UNIXPC getting swamped by RF energy at 220 MHz and shutting down .. My CONJECTURE is that other systems might also be affected. The UNIXPC's power supply is sitting, from an RF perspective, right out in the open since it's directly beneath the plastic cover with NO metal shielding or other protection. It's possible that spray-painting the underside of the UNIXPC's cover with some conductive nickel-chromium paint and grounding the plastic cover "may" alleviate the problem, but ... Thad Thad Floryan [ thad@cup.portal.com (OR) ..!sun!portal!cup.portal.com!thad ]
thad@cup.portal.com (Thad P Floryan) (12/04/89)
Again re: the problem of the UNIXPC shutting down in the presence of a strong RF field ... My CAR's electronics (1983 Ford Thunderbird) shut down whenever some cretin "rubber ducky" splatters the airwaves with a (presumably) 1KW+ illegal linear amplifier modified for the CB bands. There'd always be 1-2 seconds of typical CB banter coming through my FM radio just before the problem starts; as soon as the #%$^@% drives on ahead, the problem would cease. This has happened 3 times in 6 years, always in San Jose CA, and it was obvious (to me) from the nature of the suspect vehicle (different each time) that a scofflaw was loose and running amuck. Wonder what happens to people using a PaceMaker or hearing aid if the excess RF energy affects my CAR that way? The problem causes all instruments in the dash to go crazy, the ignition to stop igniting, and the radio to cease. Usually lasts 2-4 seconds until the offender gets out of range. At times like those, one wishes for a bazooka mounted on the fender! :-) Thad Floryan [ thad@cup.portal.com (OR) ..!sun!portal!cup.portal.com!thad ]