giles@ucf-cs.UUCP (Bruce Giles) (11/26/83)
I have noticed at several local fast-food locations (I refuse to call them restaurants) that the drive-thru lane has a small metal horn on the menu board which is aimed downward. These horns look suspiciously like microwave horns. I quess they would be used to determine if a large metal body (a car) is standing in front of the menu. Questions -- <1>: Are they microwave horns? <2>: If so, how much power do they transmit? <3>: Are they a health hazard like microwave ovens? <4>: What about rain or snow on the roadway? <5>: Can they interfer with increasingly computerized cars? (electronic ignition, cruise control, radios ...) <6>: Do they require FCC lincenses? Bruce Giles decvax!ucf-cs!giles (UUCP) UCF, Dept of Math, Orlando Fl 32816 (Snail)
abc%brl-bmd@sri-unix.UUCP (11/28/83)
From: A B Cooper III <abc@brl-bmd> Are microwave ovens health hazards? Reference?
giles.ucf-cs%Rand-Relay@sri-unix.UUCP (11/28/83)
I believe so. Why else do they require warning signs around any microwave oven in public? Something to do with pacemakers, I believe.... Bruce Giles --------------------------------------------- UUCP: decvax!ucf-cs!giles cs-net: giles@ucf ARPA: giles.ucf-cs@Rand-Relay Snail: University of Central Florida Dept of Math, POB 26000 Orlando Fl 32816 ---------------------------------------------
ark@rabbit.UUCP (11/29/83)
There is a metal horn much like what you describe on a lamp post at the intersection of Riverside Drive and West 115th Street in New York City. The horn detects cars in order to control the traffic lights at the intersection. It works by sound: I can hear the chirps it emits.
rigney@uokvax.UUCP (12/04/83)
#R:ucf-cs:-109200:uokvax:4800002:000:308 uokvax!rigney Dec 1 10:05:00 1983 I believe microwave ovens are only health hazards if the safety interlocks that turn them off when the door is opened are broken. When closed, there should be no problem. If the fast food detectors (fast food CAR detectors, that is) are microwave, wouldn't they need to post a warning for pacemaker users?
dya@unc-c.UUCP (12/07/83)
References: uiucdcs.4325
Really ! I would think you would want to break out the EMI shielding,
since the waveguides used at both X and K band are WELL beyond cutoff of
the S-band ( 2,300 mc/s ) of a microwave oven.
Our microwave oven won't light off an Escort, but there are radar detectors
whose local oscillators can be picked up a mile or so away ? Is there any
health hazard in operating these incredible transmitters ? ( Escort didn't
have STO/P (tm)).
And is there a problem with the old X-band radar, which on full speed-trap
incinerate mode can be picked up 4 miles away, being co-located with the
law enforcement officer ?
--David (
( x
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