goes into pin 10 of a Sony CXA1611 FM Receiver IC. The IC has a front end, mixer, IF and demodulation and provides received audio. In order to suppress local oscillator leakage and provide a slight amount of image rejection, a varactor and a coil provide one stage of tracking bandpass filtering. Typical for single-chip receivers, the dynamic range of this receiver is poor. When using a large antenna, expect overload/intermod problems. HF and 6 meter receive path. After relay the signal is diplexed via a low-pass filter. At this point 2 m, aircraft and WFM are diplexed. Continuing the signal passes through a low pass filter, continues through the RF Directional Coupler/Power Detector (not used in rx) through low pass filters selected by relays as appropriate for current rx frequency. The combination of lo- and hi-pass filters provide broadband bandpass filtering to the rx front end. For 6 m the hi-pass filter includes a preamplifier (always used on 6 m rx and not affected by the IPO menu setting). The appropriate high pass filter output is selected with a PIN diode with logic levels. The output from the PIN diodes are routed to the MAIN unit. Here the rx signal is applied to dual PIN diode modules (type DAP236U). One path routes the signal directly between the two modules and the other path passes the signal through a 10 db pad - the pad that is switched in as a menu item. The output is then passed through a simple lo-pass filter to another DAP236U. One of the outputs is applied to a preamplifier and the other is applied to a diode, bypassing the preamplifier. The output of the diode is applied to an IF trap. The purpose of which is to prevent 68.33 MHz energy from the antenna from getting into the 1st IF. The HF receive signal is routed to the receive mixer. Technical specifications RX Freq coverage: 100 kHz-30 MHz, 50 MHz-54 MHz, 76 MHz-108 MHz (WFM), 108 MHz-154 MHz, 420 MHz-450 MHz TX Freq coverage: 160 - 6 Meters, 2 Meters, 70 Centimeters (Amateur bands only), 5.1675 MHz Alaskan Emergency Frequency (USA model only), 5 fixed channels (USA model FT-817ND only) 5.332 MHz, 5.348 MHz, 5.368 MHz, 5.373 MHz, 5.405 MHz Power consumption: 13.8 V DC @ transmit 2A, @ receive 450mA. *Operating voltage range: within 8 -16V (AA alkaline batteries: 12V; Nicad battery: 9,6V)