QKE-INCA-TXAINCA TXF-RC Wireless Audio Transmitter

# 16022699 INCA TXF-RC WIRELESS AUDIO TRANSMITTER Version 3.6 COMPANY CONFIDENTIAL Spectronic Denmark A/S Skindbjergvej 44 DK-8500 Grenaa Telephone: +45 86 38 72 22 Fax: +45 86 38 77 04 www.spectronic-denmark.com [email protected] # 16022699 Page 2 of 8 Table of contents 1 INCA TXF-RC WIRELESS AUDIO TRANSMITTER .............................. 3 1.1 Introduction....................................................................................... 3 1.2 System Concept ............................................................................... 4 1.2.1 General ..................................................................................... 4 1.2.2 Different settings ....................................................................... 4 1.2.3 Application Note ........................................................................ 5 1.2.4 Wire connection ........................................................................ 5 1.2.5 Transmitter ................................................................................ 6 1.2.6 Remote Control Receiver.......................................................... 6 1.2.7 Remote Control Upcodes – TXF-RC VHF ................................ 7 1.3 Technical specifications ................................................................... 8 # 16022699 Page 3 of 8 1 INCA TXF-RC WIRELESS AUDIO TRANSMITTER 1.1 Introduction This document describes the general functions and performance of the Spectronic INCA TXF-RC transmitter. Information on items of a specific delivery is to be found in a separate document, stating TX frequencies and remote control address codes of the individual units. Example with external MIC Supply Microphone Antenna # 16022699 Page 4 of 8 1.2 System Concept 1.2.1 General The INCA TXF-RC is a series of wireless audio, remote controllable, small sized VHF transmitters intended for concealed room monitoring or as body transmitters. The TX unit comes with flying leads for the battery connection and the antenna terminal has a female MMCX-connector. The TX unit is deliverable with either internal or external microphone. Note: The special functions / upcodes will only be available, if using an X-IDER TX. Please refer to Section 1.2.7 Remote Control Upcodes – TXF-RC VHF . 1.2.2 Different settings Sleep mode on / off: The transmitters can be switched into sleep- mode. In sleep-mode, the current consumption is only app. 100 uA, which maximizes the lifetime of the battery more than 1000 times. In sleep-mode the receiver only goes on the air in app. 30 msec. for every 2.5 seconds to look for a valid code transmission VOX mode on / off: At the expense of a little higher current consumption (app. 150 uA), the transmitter can be switched into VOX- mode, meaning that the transmitter will run only when the microphone hear acoustic signals like talking or music. This VOX is an advanced type of circuit that has the ability to distinguish voice from background noise and the power circuit is only switched on when a voice signal is present. Therefore, the switching operation is highly reliable in noisy environments. AGC on / off: is integrated in the transmitter. The AGC action prevents over-modulation at high sound levels and makes it possible to listen to very weak conversation at the same time. Scrambler on / off: The transmitter includes an audio scrambler-circuit, which can be switched on and off by the remote control. # 16022699 Page 5 of 8 The scrambler has been added for greater security, and to avoid listening in by unauthorised persons. It is based on simple frequency- inversion techniques due to the very low power needed for that sort of circuit. In the scramble mode, the audio frequency response, as well as the signal to noise ratio, are somewhat minimized compared to the unscrambled mode. Changing channels: It is possible to shift between 4 channels by the remote control. The 4 channels (frequencies) are preprogrammed in the transmitter. During operation, it is possible to shift channel in order to use the optimal channel (frequency). 1.2.3 Application Note To achieve maximum RF range it is advisable to keep the antenna as far away from the surroundings as possible. If an antenna is in close proximity to metal surfaces, concrete walls or the human body, the efficiency of the transmitter will be minimized due to power absorption and disturbance of the antenna radiation pattern. For maximum battery lifetime and for minimizing the risk of being found by bug detectors or scanners, the transmitter can be switched off into sleep-mode by means of the remote control. Alternatively, simply choose VOX mode, when in doubt whether persons will be present in the room being monitored. The TX will then only go “on the air” every time conversation is detected in the room. After app. 15 sec. without conversation, the TX will go to sleep again and thus sawing battery power. 1.2.4 Wire connection # 16022699 Page 6 of 8 1.2.5 Transmitter During off state, the transmitter is completely switched off, and as the remote receiver does not contain a local oscillator, as would normally be the case, when using a heterodyne receiver, everything is totally quiet and nothing can be found by e.g. spectrum analyzers or scanners. For minimum current consumption, analogue frequency modulation with an audio bandwidth of (100 - 5000) Hz (unscrambled mode) has been chosen. 1.2.6 Remote Control Receiver The remote-receiver is realized by a very small and sensitive hybrid IC, intended for unlicensed low-power remote control. The carrier frequency is OOK (on off keyed) modulated and the system provides up to 4096 different address codes. The Spectronic X-IDER remote-control transmitter is used to send the different codes for setting up the TX. The Address Code of the Remote Control is factory set, according to customer specifications, or as specified for standard frequencies by Spectronic. # 16022699 Page 7 of 8 1.2.7 Remote Control Upcodes – TXF-RC VHF…

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TXF-RC Authorization Letter_16022699.doc Spectronic Denmark A/S Skindbjergvej 44 DK-8500 Grenaa, Denmark Telephone +45 86387222 Fax +45 86387704 www.spectronic-denmark.com [email protected] Bank: Nordea Randers DKK acct: DK81 2000 5700 137100 Swift: Unibdkkk VAT/CVR No. 13 44 98 48 To Federal Communications Commission 445 12 th Street SW Washington, DC 20554 Grenaa 14-10-04 Re: Authorization Letter FCC ID: QKE-INCA-TXA To Whom It May Concern: This Letter hereby authorizes Intertek, 70 Codman Hill Road, Boxborough, MA 01719 to act on behalf of Spectronic Denmark A/S until otherwise notified, for applications submitted to the FCC. We will ensure that the above-referenced products will be manufactured in accordance with the FCC rules and regulations. This is to advise that we are in full compliance with the Anti-Drug Abuse Act. The applicant is not subject to a denial of federal benefits pursuant to Section 5301 of the Anti-Drug Act of 1988, 21 U.S.C. 862, and no party to the application is subject to a denial of federal benefits pursuant to that section. Thank you for your attention to this matter. Yours Sincerely SPECTRONIC DENMARK Jimmi M. Hansen Development Manager

TXF-RC Request for Confidentiality_16022699.doc Spectronic Denmark A/S Skindbjergvej 44 DK-8500 Grenaa, Denmark Telephone +45 86387222 Fax +45 86387704 www.spectronic-denmark.com [email protected] Bank: Nordea Randers DKK acct: DK81 2000 5700 137100 Swift: Unibdkkk VAT/CVR No. 13 44 98 48 To Federal Communications Commission 445 12 th Street SW Washington, DC 20554 Grenaa 14-10-04 Re: Request for Confidentiality FCC ID: QKE-INCA-TXA To Whom It May Concern: Please be advised that the following information is to be held confidential on behalf of Spectronic Denmark A/S: ∑ Schematics (TXF-RC_VHF_Schematic_16022699.pdf) for QKE-INCA-TXA ∑ Bill of Material (TXF-RC BOM_1602269.pdf) for QKE-INCA-TXA ∑ Block Diagram (TXF-RC_BLOCK_16022699.pdf) for QKE-INCA-TXA ∑ Description (Inca TXF-RC, OD, Rev. 1.02_16022699.pdf) for QKE-INCA-TXA The application contains technical information, which Spectronic Denmark A/S deems to be trade secrets and proprietary. If made public, the information might be used to the disadvantage of the applicant in the market place. This request is made under the provisions of section 0.459(d) of the FCC rules and section 0.552(b)(4) of the Freedom of Information Act. Thank you for your attention to this matter. Yours Sincerely SPECTRONIC DENMARK Jimmi M. Hansen Development Manager

Page 1/1 4/29/2005 By: JMH / JHE TXF-RC_External_16022699 TXF-RC Transmitter FCC ID: QKE-INCA-TXA External: Top side External: Bottom side

Model: TXF-RC FCC ID: QKE-INCA-TXA Label Size: 28mm x 10mm Label for FCC ID: QKE-INCA-TXA Model: TXF-RC FCC ID: QKE-INCA-TXA Label Location for FCC ID: QKE-INCA-TXA #16022699

Page 1/1 5/6/2005 By: JMH / JHE 540155.DOC TXF-RC Transmitter FCC ID: QKE-INCA-TXA Internal: Top side Internal: Bottom side