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Nine: 80/40 Meter Code Practice Receiver
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Figure 9-2 80/40 meter direct conversion amateur radio receiver Courtesy of Vectronics signals, to produce an aural output that is differentially coupled to a LM386 audio IC The audio amplifier IC is coupled to the headphone jack at J2 by capacitor C16 The receiver circuit is power from a single 9 volt transistor radio battery Let s get started! Before we begin building the 80/40 meter receiver, you will need to locate a clean well lit and well ventilated work area A large table or workbench would be a suitable work surface for your project Next you will want to locate a small 27 to 33 watt pencil tipped soldering iron, as well as a roll of #22 gauge 60/40 tin/lead solder and a small jar of Tip Tinner, a soldering iron tip cleaner/dresser, from your local Radio Shack store You will also want to secure a few hand tools for the project, such as a pair of small end-cutters, a pair of tweezers and a pair of needle-nose pliers Locate a small Phillips and a small flat-blade screwdriver, as well as a magnifying glass to round out your tool list Grab the schematic, parts layout diagram as well as the resistor and capacitor identifier charts and we will begin our project Place all the project components on the table in front of you The 80/40 direct conversion radio is an RF or radio frequency project and it is best constructed on a printed circuit board with large ground plane areas covering the board for the best RF grounding techniques Once you have all the parts and PC board in front of you, heat up the soldering iron and we ll get started! First, find your resistor identifier chart in Table 9-1, which will help you select the resistors from the parts pile Resistors used in this project are mostly small 1 4 watt carbon composition type resistors, which have colored bands along the resistor body The first color band should be closest to one end of the resistor body This first color band represents the first digit of the resistor value For example, resistor R2 has four color bands, the first one is a brown band followed by a green band followed by a black band The fourth band is gold
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Nine: 80/40 Meter Code Practice Receiver
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Table 9-1
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Resistor color code chart
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Color Band Black Brown Red Orange Yellow Green Blue Violet Gray White Gold Silver No color 1st Digit 0 1 2 3 4 5 6 7 8 9 2nd Digit 0 1 2 3 4 5 6 7 8 9 Multiplier 1 10 100 1,000 (K) 10,000 100,000 1,000,000 (M) 10,000,000 100,000,000 1,000,000,000 01 001 5% 10% 20% 1% 2% 3% 4% Tolerance
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The first band is brown, which denotes a digit one (1), the second band is green, which represents a digit five (5), and the third band is black, which represents a multiplier of zero (0), so the resistor value is 15 ohms with a tolerance value of 5% Identify the remaining resistors for the project and we can begin populating the PC board Place a few resistors on the board at one time, so as not to confuse the process Make sure that you place the correct resistor into the correct PC location before soldering it in place Once you solder a few resistors in place on the PC board you can use your end-cutter to trim the excess component leads Cut the excess leads flush to the edge of the circuit board Then place a few more resistors on the PC board and solder them on to the board Remember to trim the component leads as necessary Next we will locate the capacitors for the 80/40 meter receiver Capacitors are listed as electrolytic and nonelectrolytic types The non-electrolytic types are generally smaller in value and size as compared with the electrolytic types Non-electrolytic capacitors, in fact, can be so small that their actual value cannot be printed on them, so a special chart was devised as shown in Table 9-2 The chart illustrates the three digit codes which are often used to represent capacitors For example, a 001 F capacitor will have (102), while a 01 F capacitor will have (103) marked on it to
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represent its true value Use the chart to identify the small capacitors in the project Non-electrolytics have no polarity markings on them so they can be installed in either direction on the PC board Electrolytic capacitors are usually larger in size and value and they will have a white or black band on the side of the capacitor body or a plus (+) or minus ( ) marking on the body of the capacitor near the leads These markings are polarity markings and that indicate the direction in which the capacitor must be mounted on the PC board Failure to observe polarity when installing the capacitor may result in damage to the capacitor or to the circuit itself, so pay particular attention to capacitor polarity when placing the capacitors on the board Note that the receiver can be built for either the 80 meter ham band or the 40 meter ham band You will need to look at the parts list when deciding which band you want to receive The inductors L1, L2 and L3 as well as capacitors C3, C4 and C5 determine the band selection Let s go ahead and place some of the non-electrolytic capacitors on the PC board Identify a few small capacitors at a time and place them on the PC board and solder them in place Trim the component leads after Go ahead and install the remaining non-electrolytic capacitors after choosing your desired band Install the capacitors and solder them in place, remember to cut
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Table 9-2
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