Value chain · CLM-1293
Low confidence
The evidence behind this statement is thin, indirect or second-hand. Read it as a lead to check, not as a settled finding.
In plain terms
A year later the same laboratory found chickens under a pulsed beam at a strength about twice the proposed beam centre went lame on one side or fled within seconds, and barely reacted when the beam came from beneath.
The claim as recorded
A 1967 Nature letter from the National Research Council of Canada reports chickens of three breeds in a test cage under 9.3 GHz pulsed microwaves (416 pulses per second, 2.3 microsecond pulses, 94 kW peak and 90 W average into the horn), with the field set at 46 mW/cm2 average 6 inches above the floor. At onset the wing outside the field collapsed and the opposite wing extended, likewise the legs; the bird turned to the outside of the field and, at the floor, extended the field side. Agitated birds either collapsed after a few quiet seconds or took flight. Very little or no reaction was seen when birds were irradiated from below. The letter states the work aimed at deterring birds from airport runways and flight lanes, and that chickens in a 20 to 50 mW/cm2 field respond with escape or avoidance within a few seconds.
Evidence behind this: T1 by venue; the letter states the field set-up but not exposure durations, bird numbers or uncertainty. It permits "the 1967 letter reports Y" only.
Scope and limits
No exposure duration is stated for the 46 mW/cm2 tests; the "few seconds" is the time to reaction, cited to the 1966 letter. Pulsed X-band, not CW; caged, not flying; bird numbers not stated. The comparison with a beam-centre level in plain rests on CLM-0080 (about 25 mW/cm2), not on this page; 46/25 is about 1.8 (ours).
What it assumes
No assumptions are recorded against this claim.
Where it comes from
, PDF p.1 (printed p.1139): "a 9.3 Gc/s microwave generator pulsed at 416 p.p.s. with a pulse width of 2.3 usec"; "set at 46 mW/cm2 (average value)"; "Very little or no reaction is detected if the bird is irradiated from below"; aim stated as "deterring birds from feeding in the vicinity of airport runways".
Related records
- Answers question
- QST-001 not published in this release
Cite this
energyaperture.com/c/clm-1293
CLM-1293, Energy Aperture, as of 1967-12-16.