Antenna explanation

FCC ID: U4F0015

Cover Letter(s)

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FCCID_893529

Datalogic Scanning Group Srl Via San Vitalino 13 40012 lippo di Calderara Italy To: FCC Subject: Consideration on new antenna gain ( Class II permissive change for Dragon M131 and Powerscan M830X) Dear Sir/Madam, The purpose of this document is to give you a rough estimation of the new antenna gain. According to the measured field strength 88dbuV/m @3 m distance from the antenna the radiated power (EIRP) is nearly equal to –7.3 dbm. (10) ⎛ 88 ⎞ ⎜ ⎟ E= 88dbuv/m ----------Æ ⎝ 20 ⎠ ≅ 25mV/m 4 *π * d * E 2 2 EIRP= considering a roughly circular polarization ; where d=3m , E = 0.025 V/m , η η = 377Ω ; so EIRP ≅ −7.28dbm Since the power applied to the input port of the antenna is nearly equal to –4dbm ( the output power of the radio is tuned to this value) then the gain of the antenna may be roughly estimated equal to -3dbm. In this way the antenna receives a conducted power of –4dbm and converts it to the radiated value of –7.28 dbm. The gain is therefore attenuation and this is accepted because the purpose of the new antenna is to have a better reliability of it instead of a higher gain compared with the previous one. The pcb realization is indeed more reliable in production than the realization with wire. Date: January 9th 2008 City: Lippo di Calderara Name of applicant: Ruggero Cacioppo Signature: Datalogic Scanning Group s.r.l. Gruppo Hydra S.p.A. – art. 2497 Cod. Civ. Direzione/Controllo Datalogic S.p.A. Via S. Vitalino, 13 40012 Lippo di Calderara di Reno Bologna - Italy Tel. +39 051 3147011 - Fax +39 051 3147288 www.datalogic.com R.E.A. Bologna 462539 Capitale sociale 10.000.000,00 euro Codice Fiscale e Partita I.V.A. 02729821203


Document Created: 2008-01-14 11:15:11
Document Modified: 2008-01-14 11:15:11
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