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   1

                       FEDERAL COMMUNICATIONS COMMISSION

                               Enforcement Bureau

                         Spectrum Enforcement Division

                              1270 Fairfield Road

                      Gettysburg, Pennsylvania 17325-7245

   VIA CERTIFIED MAIL - RETURN RECEIPT REQUESTED

   January 9, 2008

   David O. Castle

   4900 Stringtown Road

   Evansville, IN 47711

   SUBJECT: WARNING NOTICE --  UNLICENSED RADIO OPERATION

                              Case #EB-2007-SE-464

   Dear Mr. Castle:

   Monitoring information before the Commission indicates that you have been
   operating portable radio transmitting equipment on Two Meters in order to
   interfere with a local linked repeater system on 146.835/146.250, and that
   you have provided a portable unit for others to use in the same manner.

   You have no authority to operate Amateur radio transmitting equipment on
   any frequency. Such operation is a violation of Section 301 of the
   Communications Act of 1934, as amended, 47 U.S.C. Section 301, and carries
   criminal penalties including monetary forfeiture (fine) and prison.
   Monetary forfeitures normally range from $7,500 to $10,000.

   Sincerely,

   W. Riley Hollingsworth

   Special Counsel

   cc: FCC Northeastern Regional Director

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