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MEMORANDUM FOR:

THROUGH

SUBJECT : Fange Calibrstion cf Health Hazord Radiometer. Project TUMS

B

1. The CHealth Hazard Rodiometer vae cslibrated in the RF anechoic chamber at the.Wialter Reed Research Institute on 22 Februrry l967. Due to the εva1lebility of only 10 watts output power and 2 single 2-4 GHz sieep generator, meximum power density on torget ros limited to less than 0.3 miilivetts per square centimeter acros3 . S-band.

2. The ettsched strip chart recording we2 teken during the final calibration. The trace line hc been originol chart vill be retained in the  ject file. After the lost celibration adjustment the following values were obtained using the substituticn method for pover measurement.

453

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23 Februrry 1967

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SUBJECT: Range C:libration cf Heolth Hrzord Redicmeter. Project TUNS

3. The integrity of the snechoic chomber and ronge 1nstrunentetion wos steted tc be vithin =l/2 dB. The radiometer should be at leoet thot gocd cver the nerrov-band of inserest. The differences in pouer on terget rt different frequencies is due to the foct that pover leveling was not. employed and the fact thet entenna gain chonzes vith freoveney. Within the limits of mecaurement cccurccy it cen be feen from the figures thot the radiometer readings, though generally lover. are still vithin ll (or 1 dB) of the calibroted range rerdings. Since during the teste the rediometer res ploced to the side cf the microwave horn used for range crlibrction, it 1s felt that the slightly lcver readings cccurrtely reflect the field deneity tt the sensors. In any case, field readinge may be quickly correlated vith teets currently in progress in the ronge.

4. Upon completion cf testing, the radicmeter vas left vith the remoinder of the equinment supplied byE ond Vright-PattereonAFB.vhich is to te transferred to the Department cf Siote over the veek-end and prepereá for shipment to the field.

5. Every effort will be made tc expedite the modiflcotion and upgrrding of the originel tuo Soste Depertment rodiomzters, A realistic tsrget dote for delivery cf the tuo systeme should be determined within the next twc weeks.

D

Atts

Strip Chert Recordinge

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