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FM quadrature detector and finally an audio muting circuit The local oscillator transistor can operate at frequencies up to about 500 MHz in an LC circuit, or up to 150 MHz with a suitable crystal The mixer can operate up to 500 MHz as well, while the IF amplifier and limiter can operate up to about 25 MHz with a combined gain of about 90 dB The main receiver diagram illustrated in Figure 23-4 depicts the complete weather satellite receiver circuit details In this receiver project, we re using the SA605D in a fairly conventional single-conversion superhet configuration, with the IF amplifier and limiter working at 55 MHz This allows us to take advantage of high selectivity 55 MHz TV sound IF ceramic filters to provide most of our bandwidth shaping The two filters in question are X1 and X2, which are both Murata SFT55MA devices As shown in the receiver schematic, X1 is connected between the mixer output and the IF amplifier input, while X2 is connected between the IF amplifier output and the limiter input The resistors connected to the filter inputs and outputs are mainly for impedance matching, while the 10 nF capacitors are for DC blocking The 90 phase shift required for U1 s quadrature FM detector is provided by coil L4 and its parallel 390 pF capacitor, which are tuned to 55 MHz The local oscillator transistor inside U11 is connected in a Colpitts circuit This includes coil L3, together with the two 15 pF capacitors (which provide the emitter tap) and a 10 pF capacitor in series with the Varicap diode D1 The Varicap diode D1 is the receiver s tuning capacitor Its tuning voltage for each of the two channels is set by 10-turn trimpots VR4 and VR5, with switch S1 selecting between them We can tune the receiver simply by changing the local oscillator frequency because we only need to tune over a relatively small range (ie 1373 13785 MHz maximum), which is within the selectivity curve of the front end tuned circuits The satellite receiver s front end uses a BF998 dualgate MOSFET (Q1) connected in a standard cascode amplifier configuration The incoming VHF signals are fed into a tap (for impedance matching) on antenna coil L1, which is tuned to about 13755 MHz using trimmer capacitor VC1 The signal from the top of this tuned.

Dennis Simon of Sparks, Maryland, wanted to combine his two collecting hobbies antique cars and antique auto racing posters and turn them into a business related to his art Although his talent was recognized early, it took a great deal of work for Simon to earn the high place he now enjoys in automotive art circles After he graduated from art school, Simon spent a period of time doing freelance art for advertising agencies and United States government publications One plum assignment stretched into a thirteen-year stint designing park exhibit systems for the National Park Service Eventually, Simon had had enough of more conventional art assignments He began developing an art style that echoed his interest in vintage racing cars Not quite vintage, as defined by antique car clubs, these cars mostly European were

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