VKVF50LICENSED NON-BROADCAST STATION TRANSMITTER

December 18, 2009 Timco Engineering Inc. 849 NW State Road 45 Newberry, FL 32669 Office of Engineering and Technology Federal Communications Commission Columbia, MD 21046 Applicant: DBII NETWORKS LIMITED 201 Oak Ave, #D Carlsbad, CA 92008 Re: Confidentiality for submittal information regarding FCC ID number VKVF50 PRODUCT: Composite modular transmitter for Broadband Public Safety Equipment operating under part 90Y and 15C Dear Sirs: DBII NETWORKS LIMITED requests that the material in the Schematic, block diagram, parts list, and Operational Description be withheld from public disclosure in accordance with Section 0.459 of the Commissions Rules, 47 C.F.R., following grant of the application. In support of this request, DBII NETWORKS LIMITED submits the following: Long Term Confidential Files Include Schematics File Name Conf Schem F50.pdf Block diagram File Name Con f BlkDia F50.pdf Operational Description File Name Conf OpDes F50.pdf Parts List File Name Conf PartList F50.pdf 1. Identification of the specific information for which confidential treatment is sought: The materials set fourth in the Operational Description, block diagram, and Schematics, which are segregated from the non-confidential exhibits of the application, are those for which confidentiality is sought. 2. Identification of the Commission proceeding in which the information was submitted or a description of the circumstances giving rise to the submission: The proceeding is that involving the application for equipment authorization (certification) under FCC ID No: VKVF50 3. Explanation of the degree to which the information is commercial or financial, or contains a trade secret or is privileged: This material includes a detailed theory of operation, circuit diagrams, (schematic diagrams) and any detail Parts List. As such, this material is treated as highly confidential business information. ROGERS LABS, INC. 4405 West 259 th Terrace Louisburg, KS 66053 4. Explanation of the degree to which the information concerns a service that is subject to competition: The material for which confidentiality is sought is employed in the design and manufacture of this transmitting equipment that is offered on a highly competitive basis. Customers for this equipment have a variety of competing sources. 5. Explanation of how disclosure of the information could result in substantial competitive harm: Disclosure would, in effect, give away the fruits of the labors of DBii Networks Limited’s engineering personnel, who have designed the equipment and the manufacturing process. Disclosure would also offer competitors additional unwarranted insight into the state of the product development, thereby allowing competitors an advantage, not available to DBII NETWORKS LIMITED. 6. Identification of any measures taken by the submitting party to prevent unauthorized disclosure: The information for which confidential treatment is sought is kept confidential by DBII NETWORKS LIMITED and not made available to third parties except pursuant to non-disclosure agreements. 7. Identification of whether the information is available to the public and the extent of any previous disclosure of the information to third parties: To the knowledge of those preparing this application, the information has not been disclosed publicly heretofore. While the general theory of operation of this equipment has been the subject of numerous disclosures in industry and standards groups as well as in rule making proceedings of the FCC, the protection sought is narrowly drawn and pertains to certain specific implementations of this radio technology. 8. Justification of the period during which the submitting party asserts that the material should not be available for public disclosure: This material should not be disclosed for at least 25 years. While improvements in design are made relatively frequently, disclosure of the design information would lead to insights into both design and manufacturing techniques that could have an adverse competitive effect for many years to come. This equipment is designed for commercial, industrial, and governmental applications. As such, unlike most consumer equipment, this equipment could be used for more than a decade in some cases. As such, it is important that the design not be made available to unauthorized persons who might attempt to use knowledge of the design to compromise the applications for which the equipment will be employed. Should you require any further information, please contact the undersigned. Thank you for your consideration in this matter. Sincerely, Scot Rogers

Dbii Networks, Inc. 201 Oak Ave, #D, Carlsbad, CA 92008 Ph:760-536-8036 Fax: 760-859-3132 December 18, 2009 Timco Engineering, Inc. 849 NW State Road 45 P.O. Box 370 Newberry, Florida 32669 Re.: Professional Installation Attestation Equipment: FCC: VKVF50 To Whom It May Concern: Dbii Networks addresses the following items to ensure that the above referenced equipment is professionally installed: 1. The VKVF50 will only be sold by Dbii Networks, Inc or one of its authorized dealers. Dbii Networks, Inc and its authorized dealers will be under strict marketing control and will only market and sell the VKVF50 to professionals. 2. Professional installation is required for the VKVF50 and will be performed only by someone knowledgeable of its use. Dbii Networks, Inc will ensure that the VKVF50 is only marketed and sold to professionals. 3. The VKVF50 is not sold to the general public and is sold only for industrial or commercial use by professional installers. Sincerely, Rammohan Malasani Operations Manager Dbii Networks, Inc 201 Oak Ave, #D Carlsbad CA 92008

December 18, 2009 Timco Engineering Inc. 849 NW State Road 45 Newberry, FL 32669 Federal Communications Commission Equipment Approval Services P.O. Box 35815 Pittsburgh, PA 15251-3315 Applicant: DBII NETWORKS LIMITED 201 Oak Ave, #D Carlsbad, CA 92008 Equipment: FCC ID: VKVF50 FCC Rules: Parts 90Y Public Safety Equipment and 15C, modular transmitter approval Gentlemen: The form 731 and application have been electronically submitted and any attachments will be up loaded to your web site to be used in obtaining grant of certification. Permanent DBii Networks Limited requests that the material in the following files be withheld from public disclosure in accordance with Section 0.459 of the Commission’s Rules, 47 C.F.R. 0.459, following grant of the application. Schematics File Name Conf Schem F50.pdf Block diagram File Name Conf BlkDia F50.pdf Operational Description File Name Conf OpDes F50.pdf Parts List File Name Conf PartList F50.pdf Should you require any further information, please contact the undersigned. Thank you for your consideration in this matter. Sincerely, Scot Rogers Rogers Labs, Inc. Enclosures ROGERS LABS, INC. 4405 West 259 th Terrace Louisburg, KS 66053 Phone / Fax (913) 837-3214

December 18, 2009 Timco Engineering Inc. 849 NW State Road 45 Newberry, FL 32669 Federal Communications Commission Equipment Approval Services P.O. Box 35815 Pittsburgh, PA 15251-3315 Applicant: DBii Networks Limited 201 Oak Ave, #D Carlsbad, CA 92008 Equipment: FCC ID: VKVF50 FCC Rules: Part 2, 15C and 90Y (Composite Modular Transmitter) Re: modular composite transmitter approval Gentlemen: As requested in the Public Notice DA00-1407 regarding Part 15 unlicensed modular transmitter approval, the following information has been addressed. The transmitter module is a complete RF transmitter containing its own reference oscillator, antenna etc. The connections available on the module are for power only. Below please find information, addressing each paragraph from DA00- 1407, requested about the unit. 1.) The unit has shield effectively preventing coupling between the RF circuitry of the module and any wires or circuits in the device into which the module is installed. Photographs of the unit are included in an exhibit with the application. 2.) The unit incorporates a buffer stage on the inputs to limit over-modulation. 3.) The unit has power regulation incorporated in the circuitry to ensure continued compliance regardless of the design of the power supplying circuitry. 4.) The unit utilizes a unique antenna connection and complies with the antenna connection requirements of 15.203. 5.) The module was tested in a stand-alone configuration utilizing a test fixture for interface allowing for testing. The module complies with part 15 emissions limits regardless of the device into which it is eventually installed. 6.) The module has the FCC ID number permanently affixed to the equipment and information supplied to the end OEM regarding label placement on the outside of the device into which the module is contained. 7.) The unit complies with CFR47 regulations as stated in the user manual. Adequate instructions are supplied with the unit to explain the requirements. 8.) The unit complies with the RF exposure requirements as stated in 2.1091, 2.1093, and part 15. Should you require any further information, please contact the undersigned. Thank you for your consideration in this matter. Sincerely, Scot D. Rogers Rogers Labs, Inc. ROGERS LABS, INC. 4405 West 259 th Terrace Louisburg, KS 66053 Phone / Fax (913) 837-3214

Rogers Labs, Inc. DBii Networks Limited FCC ID#: VKVF50 4405 W. 259th Terrace Model: F50 Louisburg, KS 66053 Test #: 090908 Phone/Fax: (913) 837-3214 Test to: FCC Parts 2 and 90 Page 1 of 1 Revision 1 File: ExtPho F50 Date: December 18, 2009 External photographs of equipment under test

Rogers Labs, Inc. DBii Networks Limited FCC ID#: VKVF50 4405 W. 259th Terrace Model: F50 Louisburg, KS 66053 Test #: 090908 Phone/Fax: (913) 837-3214 Test to: FCC Parts 2 and 90 Page 1 of 1 Revision 1 File: LabelSmp F50 Date: December 18, 2009 FCC/IC ID label and location

Rogers Labs, Inc. DBii Networks Limited FCC ID#: VKVF50 4405 W. 259th Terrace Model: F50 Louisburg, KS 66053 Test #: 090908 Phone/Fax: (913) 837-3214 Test to: FCC Parts 2 and 90 Page 1 of 3 Revision 1 File: IntPho F50 Date: December 18, 2009 Internal photographs of equipment under test Top of Transmitter module without shield in place Bottom side of Transmitter module Rogers Labs, Inc. DBii Networks Limited FCC ID#: VKVF50 4405 W. 259th Terrace Model: F50 Louisburg, KS 66053 Test #: 090908 Phone/Fax: (913) 837-3214 Test to: FCC Parts 2 and 90 Page 2 of 3 Revision 1 File: IntPho F50 Date: December 18, 2009 Support interface board Rogers Labs, Inc. DBii Networks Limited FCC ID#: VKVF50 4405 W. 259th Terrace Model: F50 Louisburg, KS 66053 Test #: 090908 Phone/Fax: (913) 837-3214 Test to: FCC Parts 2 and 90 Page 3 of 3 Revision 1 File: IntPho F50 Date: December 18, 2009 Transmitter board placed on the support interface board

Rogers Labs, Inc. DBii Networks Limited FCC ID#: VKVF50 4405 W. 259th Terrace Model: F50 Louisburg, KS 66053 Test #: 090908 Phone/Fax: (913) 837-3214 Test to: FCC Parts 2 and 90 Page 1 of 1 Revision 1 File: TunPro F50 Date: December 18, 2009 The unit has no provisions for tuning. It is produced and tested with a pass on pass operation.

NVLAP Lab Code: 200087-0 Rogers Labs, Inc. DBii Networks Limited 4405 W. 259th Terrace Model: F50 FCC ID#: VKVF50 Louisburg, KS 66053 Test #: 090908 Phone/Fax: (913) 837-3214 Test to: CFR47 Parts 2, 90(Y) Page 1 of 41 Revision 1 File: DBii F50 TstRpt 90y Date: December 18, 2009 SUBMITTAL APPLICATION REPORT FOR GRANT OF CERTIFICATION FOR Model: F50 CFR47 90(Y) Broadband Public Safety Equipment Operating in the Band 4940-4990 MHz FCC ID: VKVF50 FOR DBii Networks Limited 201 OAK AVE, #D Carlsbad, CA 92008 Report Number 090908 Authorized Signatory: Scot D. Rogers NVLAP Lab Code: 200087-0 Rogers Labs, Inc. DBii Networks Limited 4405 W. 259th Terrace Model: F50 FCC ID#: VKVF50 Louisburg, KS 66053 Test #: 090908 Phone/Fax: (913) 837-3214 Test to: CFR47 Parts 2, 90(Y) Page 2 of 41 Revision 1 File: DBii F50 TstRpt 90y Date: December 18, 2009 Submittal Application Test Report For Grant of Certification For DBii Networks Limited 201 OAK AVE, #D Carlsbad, CA 92008 MODEL: F50 Public Safety Band Operation in the 4940-4990 MHz Frequency Band Frequency Band of Operation: 4942.5 – 4987.5 MHz FCC ID: VKVF50 Test Date: September 8, 2009 Certifying Engineer: Scot D. Rogers Rogers Labs, Inc. 4405 W. 259th Terrace Louisburg, KS 66053 Phone: (913) 837-3214 Fax: (913) 837-3214 This report shall not be reproduced except in full, without the written approval of the laboratory. This report must not be used by the client to claim product endorsement by NVLAP, NIST or any agency of the U.S. Government. ROGERS LABS, INC. 4405 West 259 th Terrace Louisburg, KS 66053 Phone / Fax (913) 837-3214 NVLAP Lab Code: 200087-0 Rogers Labs, Inc. DBii Networks Limited 4405 W. 259th Terrace Model: F50 FCC ID#: VKVF50 Louisburg, KS 66053 Test #: 090908 Phone/Fax: (913) 837-3214 Test to: CFR47 Parts 2, 90(Y) Page 3 of 41 Revision 1 File: DBii F50 TstRpt 90y Date: December 18, 2009 Table Of Contents TABLE OF CONTENTS .................................................................................................... 3 EXECUTIVE SUMMARY .................................................................................................. 5 OPINION / INTERPRETATION OF RESULTS ................................................................. 5 ENVIRONMENTAL CONDITIONS .................................................................................... 5 APPLICABLE STANDARDS AND TEST PROCEDURES ............................................... 5 LIST OF TEST EQUIPMENT ............................................................................................ 6 TEST SITE LOCATIONS .................................................................................................. 6 2.1033(C) APPLICATION FOR CERTIFICATION ............................................................ 7 2.1046 RF POWER OUTPUT ........................................................................................... 9 Measurements Required .......................................................................................................................................... 9 Test Arrangement ..................................................................................................................................................... 9 Results Peak Radio Frequency Output Power ....................................................................................................... 10 Figure 1 Peak Output in Operational Band Plot..................................................................................................... 10 Results Peak Power Spectral Density...................................................................................................................... 11 Figure 2 Peak Power Spectral Density Plot 5MHz Channel Spacing Low Channel ............................................. 11 Figure 3 Peak Power Spectral Density Plot 5MHz Channel Spacing Middle Channel ......................................... 12 Figure 4 Peak Power Spectral Density Plot 5MHz Channel Spacing High Channel ............................................. 12 Figure 5 Peak Power Spectral Density Plot 10 MHz Channel Spacing Low Channel .......................................... 13 Figure 6 Peak Power Spectral Density Plot 10 MHz Channel Spacing Middle Channel ...................................... 13 Figure 7 Peak Power Spectral Density Plot 10 MHz Channel Spacing High Channel .......................................... 14 Figure 8 Peak Power Spectral Density Plot 20 MHz Channel Spacing Low Channel .......................................... 14 Figure 9 Peak Power Spectral Density Plot 20 MHz Channel Spacing Middle Channel ...................................... 15 Figure 10 Peak Power Spectral Density Plot 20 MHz Channel Spacing High Channel ........................................ 15 2.1047 MODULATION CHARACTERISTICS ................................................................... 16 Measurements Required .......................................................................................................................................... 16 Results Modulation Characteristics ........................................................................................................................ 16 2.1049 OCCUPIED BANDWIDTH, 90.210(M) EMISSIONS MASK .................................. 16 Measurements Required .......................................................................................................................................... 16 Test Arrangement ..................................................................................................................................................... 16 Results of Emissions Mask ....................................................................................................................................... 17 Figure 11 Emissions Mask Plot 5 MHz Channel Spacing Low Channel ............................................................... 17 Figure 12 Emissions Mask Plot 5 MHz Channel Spacing Middle Chan…

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Rogers Labs, Inc. DBii Networks Limited FCC ID#: VKVF50 4405 W. 259th Terrace Model: F50 Louisburg, KS 66053 Test #: 090908 Phone/Fax: (913) 837-3214 Test to: FCC Parts 2 and 90 Page 1 of 2 Revision 1 File: TSup F50 90y Date: December 18, 2009 Test setup photographs AC Line Conducted Emissions Rogers Labs, Inc. DBii Networks Limited FCC ID#: VKVF50 4405 W. 259th Terrace Model: F50 Louisburg, KS 66053 Test #: 090908 Phone/Fax: (913) 837-3214 Test to: FCC Parts 2 and 90 Page 2 of 2 Revision 1 File: TSup F50 90y Date: December 18, 2009