Incoming generated [Jul 10 2012]

0335-EX-PL-2012 Correspondence

Mayo Clinic

2012-07-11ELS_127375

From: Mark Vickberg

To: Behnam Ghaffari
Date: July 10, 2012

Subject: FCC File No. 0335-EX-PL-2012
----------------------------------------------------------------------------------------------------------------
Message:

Mayo Clinic Experimental License Application Correspondence Reply

To:       Behnam Ghaffari
          Federal Communication Commission
          Office of Engineering and Technology

Re:         Correspondence Reference Numbers 17441 & 17442
            FCC Form 442
            File # 0335-EX-PL-2012

You asked for clarification and additional information, ?If this is to request to operate under Part 15 power
restriction rules, please submit a detailed power calculation as how 0.75 mW (ERP) has been obtained.?

This is a request to operate under Part 15 power restriction rules. As described below, we plan to ensure
proper operation by direct calibration. The laboratory in which the on-body transmitter hardware and
gateway is being designed and assembled contains a large suite of RF test equipment including items
such as spectrum analyzers, network analyzers, power meters etc. and a fully anechoic antenna test
chamber. These instruments are calibrated on an annual basis to NIST traceable standards.

The on-body experimental transmitter circuit includes RF test points at the transmitter integrated circuit
output and antenna matching circuit output. This allows direct power measurements to be made using a
laboratory grade power meter and spectrum analyzer with coaxial probes. The transmitter circuit is
adjustable in 0.65 dB increments allowing the final power to be precisely set.

The gateway also includes the programmable power feature and can be connected directly by coax for
final circuit characterization. After characterization of circuit losses and antenna performance to
determine the appropriate power level setting, final ERP values for each of these devices will be verified
by direct measurement in the anechoic chamber.

Sincerely,
Mark Vickberg
Sr. Engineer II
Mayo Clinic
200 1st Street SW
Rochester, MN 55905
507-538-5496
vickberg.mark@mayo.edu



Document Created: 2012-07-11 08:43:10
Document Modified: 2012-07-11 08:43:10

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