Yaesu FT-857 Manual

Also see for FT-857 series: Manual Technical supplement Operation manual Brochure & specs Operating manual

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Installing a LIF port into the FT-857/897 transceiverIntroductionThis document describes the procedure for installing a LIF (Low IntermediateFrequency [9 – 18kHz]) port into the FT-857/897 transceiver. This procedurerequires a level of expertise sufficient to dismantle the transceiver and to solder.Nonetheless, the installation is straight forward and should not cause anydifficulties for the experienced radio amateur.It is important to unplug all connectors and power before working on anytransceiver. It is also important to be grounded to avoid static discharges.Please note: no responsibility or liability will be taken by the author of thisdocument for any damage or malfunction caused by user modifications.LIF port installationDismantling the TransceiverThe top cover of the radio must be removed. There are 7 screws that needto be removed and then the lid will become loose; there are 3 screws onthe top cover and 2 on each side. Remove the lid carefully; the speakercable will still be connected to the circuit board. Unplug the speaker.Connecting the RG174 cable to the PCBSolder the ground shield of the RG174 to the first 3 pins of J23. This willalso make the option filter 1 selectable in the radio’s menu. Pin 4 is the RFand it needs to be connected to the center of the RG174 coaxial cable andto the input of the 455kHz filter. The center pin of the filter is connected topin 2 of J24 and the output is connected to pin 3. The filter is secured onthe PCB with double sticky tape. The filter will keep the AGC function

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