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The AM detector has three distinct advantages; it has high bandwidth, low distortion and incredible (and variable) sensitivity The variable bias control allows the listener to adjust the bias to maintain detected audio fidelity even when the RF signal is weak The detector uses a Schottky UHF mixer diode at D1 Increasing the diode bias from zero volts to maximum causes three things to happen: increased sensitivity, increased audio high frequency response, and a slight increase in receiver noise The AM detector section matches the 2000 ohm impedance of the crystal filter stage quite nicely A sensitivity control at VR2 is a 1 megohm potentiometer, which feeds directly to L6, a 1000 H coil Coil L6 is connected directly to a Schottky diode at D1 The resultant signal is next sent through a 56k ohm resistor and on to a 1 F capacitor which feeds the nJFET at Q4 The Source lead of Q1 is connected to the Drain lead of Q5, and the Source lead of Q5 is connected to ground via a 56k ohm resistor Note the two 22 F electrolytic capacitors on each of the Drain leads of the nJFETs When the WWV RF signal is weak, turning the bias off may result in the detected WWV signal disappearing Increasing the bias will bring the WWV signal back in You run the bias control pot about half way and, of course, higher as WWV fades out The fidelity that the bias adds even when the WWV signal is strong is quite pleasing to the ear For the 1 F and 22 F capacitors, I used polyester film types which sounded better than electrolytic capacitors The audio amplifier section features low noise audio amplifier Distortion is very low as long as the input is

Next, I do a schematic plan, making preliminary drawings and sketches, describing a design for the client s approval This stage could take four weeks or so Once the client approves the project, I produce an outline of the scope of work and gure an order-of-magnitude cost estimate After that stage is approved, the next phase is to work on design development documents This involves the use of more detailed drawings and can take from six to eight weeks Over the next eight to twelve weeks, construction documents including drawings and speci cations are produced During the bidding phase, the contractor is selected If necessary, we review and revise the construction plans before beginning work I make frequent visits to the site while the project is progressing Construction time varies but could take eight months to a year and a half depending upon the scope of the project

not over driven The audio amplifier section consists of a dual NE5532 op-amp and three transistors Transistors Q6 and Q7 are NPN types, while transistor Q7 is a PNP type The input signal from the detector is fed directly to the volume control at VR3, a 10k ohm potentiometer The input signal is first sent to the non-inverting stage of the first op-amp at pin 3 The output of the first op-amp section at pin 1 is next sent to the second stage of the op-amp through a 1 F capacitor in series with a 47k ohm resistor to pin of U1:b The output of U1, at pin 7 is then fed to the output transistor stage The output of the transistor pair is two 1000 F capacitors which coupled to a 330 F capacitor which feeds the 8 ohm speaker The entire WWV receiver is powered from a 12 volt wall-wart power or can be powered from a 12 volt battery for portable operation