State from manufacturer regarding cellur bands

FCC ID: MKDAR247

Attestation Statements

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FCCID_67058

ADI Communications Corp. No.193,Sec. 1,Chungching Road, Taya,Taichung,Taiwan 428,R.O.C. Tel: 886-4-5600511 Fax: 886-4-5601827 STATEMENT October 27, 1999 Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 To whom it may concern: We, ADI Communications Corp., hereby assured that our product AR-247 cannot be altered to receive cellular band by any modifications ( tuning, control, filtering , change parts or modify circuit ). That is because following reason: 1. ADI/AR247 FCC/INQ a. The design features is based on the following: - The VCO fixing the frequency range from 180- 230MHz so that it can not to receive the CELLULAR BAND FOR UP TO 800MHz. - The frequency of synthesizer(MB1504) using range are below the 520MHz, it can't be to modified up to 800 MHz. - All the design features inside using " helical filter" ( L8, L9 ) and also fix for 215-230 MHz ranges it can't be modified too. - The receiving image rejection spec. are > 80 dB. So that it can not to receive the CELLULAR BAND FOR UP TO 800MHz. - The transmit frequency range fixing from 222- 224.995MHz so that it can not to receive the CELLULAR BAND FOR UP TO 800MHz. b. The design step taken as follow ; - Basically AR-247 is a superheterodyne receiver , it can only be receive signal range from 215 ~ 230 MHz. also the VCO range are 184.5 ~ 199.15 MHz in between , there are mixing a fixing IF frequency 30.85 MHz to working on it so this is much lower then the receive range. - The receiving range use "band pass filter" to attenuate fixing helical filter(L8,L9) range from 215- 230 MHz, with limit to up to 60dB so it can not to receive CELLULAR BAND.

Sincerely, ADI Communications Corp. W.J.Tso


Document Created: 2001-05-21 11:57:08
Document Modified: 2001-05-21 11:57:08
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