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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

   March 8, 2007

   David O. Castle

   4900 Stringtown Road

   Evansville, IN 47711

   RE: Warning Notice: Amateur license WA9KJI

   Dear Mr. Castle:

   The trustee of the Tri-State Amateur Radio Society W9OG repeater requested
   in writing on February 8, 2007, that you refrain from use of the repeater
   system operating on 146.79/146.19 and 147.15/147.75 MHz. That letter was
   issued as a result of your failure to follow operational rules set forth
   by the licensee/control operators of the repeater system for its users.
   You were previously requested verbally to refrain from using the system,
   but have apparently ignored both verbal and written requests.

   The Commission requires that repeaters be under the supervision of a
   control operator and not only expects, but requires, such control
   operators and licensees to be responsible for the proper operation of the
   repeater system. Control operators may take whatever steps are appropriate
   to ensure compliance with the repeater and Commission rules, including
   limiting the repeater use to certain users, converting the repeater to a
   closed repeater or taking it off the air entirely.

   Please be advised that we expect you to abide by the request to stay off
   the W9OG system and any other such request by a repeater licensee, control
   operator or trustee. If you use the repeater again after receipt of this
   letter, we will initiate enforcement action against your license, which
   may include revocation or monetary forfeiture (fine). Fines normally range
   from $7,500 to $10,000.

   Additionally, the issue of interference to the Tri-State Amateur Radio
   Society will be made an issue in your upcoming license renewal hearing.
   You were notified of that by letter dated October 11, 2006.

   Sincerely,

   W. Riley Hollingsworth

   Special Counsel

   cc: FCC Northeastern Regional Director