Kenwood TK-2180 Modification Information

Also see for TK-2180: Specifications Brochure & specs Instruction manual Instruction manual Service manual

Version: 1.13 USA Modification Information 303 CONNECT THIRD PARTY OPTIONS3.1 Voice Scrambler BoardYou can install the optional board, such as a VoiceScrambler board, to the transceiver. This sectiondescribes how to install the TRANSCRYPT SC20-460 tothe transceiver.Refer to the following URL or TRANSCRYPT for theproduct details.http://www.intepla.com/transcrypt/Pages/Two-way/460.html! Items Required to Install• Transceiver• SC20-460• Cushion Tape• Protective cloth (N9440B, with an adhesive tape onone side)3.1.1 SC20-460 Board1. Prepare the SC20-460 board.2. To modify the SC20-460 board and change the RXAudio Input method.In the normal Voice Scrambler board, the transceiverenters the RX audio signals before de-emphasizingthe signal.However, the transceiver enters the RX audio signalsafter de-emphasizing the signal, so that you mustmodify the Voice Scrambler board.• Cut the foil between E52 and E53.• Solder the position between E51 and E52 toconnect them.• Solder the position between E53 and E54.Note:# The required modification must be performed to avoidsymptoms, such as low level-audio signals from thespeaker, or too loud and distorted voice.# Refer to the instruction manual supplied with the VoiceScrambler for details.3. Change the constant in conjunction with the TX/RXaudio level.• Replace the R1 with the part with 100kohm and R3with the part with 100kohm in conjunction with theRX audio level.• Replace the R2 with the part with 6.8kohm and R4with the part with 6.8kohm in conjunction with theTX audio level.Note:# The required modification must be performed to avoidsymptoms, such as low-level audio signals from thespeaker, or too loud and distorted voice.# Refer to the instruction manual supplied with the VoiceScrambler for details.CAUTIONYOU MUST TURN THE TRANSCEIVER OFF AND REMOVETHE POWER CABLE BEFORE CONNECTING THE OPTIONTO THE TRANSCEIVER.Before Modification After ModificationR1, R3: 100kohm(The SC20-460 board default)R1, R3: 100kohm(No modification)R2, R4: 100kohm(The the SC20-460 board default) R2, R4: 6.8kohmE51DefaultAfterModificationE52E53E54E51E52E53E54