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                   CERTIFIED MAIL - RETURN RECEIPT REQUESTED

   April 9, 2010

   Mr. William K. Clark

   (Address withheld)

   (City/State withheld)

   Re: WARNING NOTICE

   Amateur Radio License WK7X

   EB-10-GB-0029

   Dear Mr. Clark:

   By letter dated March 10, 2010, the Commission notified you that it had
   received a complaint concerning the operation of your amateur radio
   station. The complaint alleged that you transmitted obscene or indecent
   words or language in violation of Section 97.113(a) (4) of the
   Commission's rules. A copy of the complaint was sent to you for your
   review.

   You responded to the Commission's letter on April 5, 2010. In that letter,
   you acknowledged that you made a "very bad decision using indecent words."
   You further explain that you are a disabled Viet Nam veteran who uses your
   amateur radio as your primary source of entertainment. In your response,
   you mentioned that the incident was very short in duration and requested
   leniency on the part of the Commission as a result of the acknowledged
   rule violation. Finally, you indicated that you were "very (extremely)
   sorry for [your] actions" and stated that it would "never happen again."

   Your operation as described above is contrary to the basis and purpose of
   the amateur radio service as set out in Section 97.1 of the Commission's
   rules. Please be advised that the Commission expects you to abide by its
   rules. This letter serves as notice that, if operation of this type
   reoccurs after receipt of this letter, you could be

   subject to severe penalties, including license revocation, monetary
   forfeiture (fines), or a modification proceeding to restrict the
   frequencies upon which you may operate.

   Sincerely,

   Laura L. Smith

   Special Counsel

   Cc: Denver Field Office

   Western Regional Director

   See 47 C.F.R. S: 97.1.

   Fines normally range from $7,500 to $10,000.