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circuit is then fed directly to gate 1 of Q1, while gate 2 is bypassed to ground but also fed with an adjustable DC voltage via VR1 for RF gain control The amplified VHF signal on Q1 s drain is fed to pin 1 of U1 via a 1 nF coupling capacitor Additional RF selectivity is provided by coil L2 and trimmer capacitor VC2, which are again tuned to about 13755 MHz The 100 ohm resistor and 10 H RF choke form an untuned highimpedance load for Q1 Notice that as well as being coupled to the tap on L1 via a 22 nF capacitor, the antenna input is also connected to the +12V supply line via RFC1 and a series 22 ohm resistor As you may have guessed, these components are there to provide phantom DC power for the masthead pre-amplifier At the output end of U1, we take the demodulated APT signals from the muted audio output at pin 8 This allows us to take advantage of the SA605 s built-in muting circuit, which works by using comparator stage U2b to compare U1 s RSSI output from pin 7 (proportional to the logarithm of signal strength) with an adjustable DC control voltage from muting pot VR2 When the RSSI voltage rises above the voltage from VR2, U2b s output switches high and this is fed to pin 5 of U1 via a 22 k ohm series resistor to un-mute the audio D2, a 51V Zener diode, limits the swing on pin 5 of U1 to less than 6V Transistor Q2 and LED1 form a simple signal strength indicator This also uses the RSSI output from U1 In operation, the voltage across the 390 k ohm resistor and 100 nF capacitor rises from about +026V under no-signal conditions to about +5V with a very strong input signal So with Q2 connected as an emitter follower and LED1 in its emitter load, the LED current and brightness are made to vary quite usefully with signal strength The demodulated APT signal from pin 8 of U1 is first fed through op-amp U2a, which is configured as an active low-pass filter This has a turnover frequency of 5 kHz and is used for final de-emphasis and noise reduction From there, the signal is fed to audio gain control VR3 and then to audio amplifier stage U3 This is a standard LM386 audio amplifier IC, configured for a gain of about 40 times Its output is fed to both the monitor speaker socket and to a line output socket for connection to your PC s sound card Most of the receiver s circuitry operates from +12V, with the exception of U1 which needs +6V As a result,.

C1 R1 VR1 C7 R2 RfC1 R5 G2 G1 D L2 C10 C12 G1 J1 C2 C3 L1 C4 C5 R3 D1 +6 V B VR4 VR5 S1 A R10 D2 + R20 7 8 5 U2:B 6 4 R19 C32 L3 C16 R11 C8 R7 R9 C13 C15 RfC3 C31 +6 V +12 V +12 V R22 b c Q2 c R24 R23 A D3 R21 K 6 3 1 2 R26 + C34 C36 + R25 C35 C37 J3 S C14 C17 + C18 R18 3 U2:A 1 C33 R27 J2 R17 2 4 3 5 R6 R8 C9 1 20 R4 C6 RfC2 + C11 C19 C20 19 C21 C22 18 17 16 U1 10 6 7 8 C30 C29 +12 V C23 C24 15 13 14 +12 V R12 X1 R13 R14 R15 R16 C25 C26 12 11

the power supply circuitry includes U5 to provide a regulated and smoothed +12 V supply from an external supply such as a 145 18 V wall-wart This is followed by 5V regulator U4 which has its output jacked up using 300 ohm and 47 ohm resistors to provide close to +6 V for the SA605D (U1) Note that if you want to run the receiver from a 12 V battery, this can be quite easily done by replacing REG1 with a wire link In addition, the 2200 F capacitor should be replaced with a 16 V Zener diode (ZD2) for over-voltage protection