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Mounting the semiconductors
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Before we go ahead and install the semiconductors, let s take a brief look at the semiconductor pin-out diagram illustrated in Figure 23-5, which will assist you in orienting the integrated circuits Now you can go ahead and mount the semiconductors Begin by installing the Varicap diode at D1, and the 51V Zener diode at D2 and transistor Q2 Next, install regulator U5 and its associated heatsink These parts are secured to the board using a 6 mm-long M3 screw, nut and lock-washer
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Figure 23-5 Semiconductor pin-outs
careful to avoid damage from static electricity Do not move around when installing these static sensitive components and be sure to use an anti-static wrist band to avoid damage The completed PC board is housed in a suitable low-profile plastic instrument case First, you can mount switch S1 on the front panel and connect three 30 mm lengths of insulated hookup wire to the three pins on the PC board That done, the front panel can be mated with the PC board by positioning it on the three pot ferrules and doing up the nuts The three leads from the PC board pins can then be soldered to the switch lugs The rear panel is not attached to the board assembly Instead, it simply slips over connectors CON1 and CON2 and is then slid into the rear slot when the assembly is fitted into the bottom half of the case Now go ahead and mount the antenna connector onto the rear panel Finally, the completed assembly is fastened in place using eight 6 mm-long 4-gauge self-tapping screws After completing the circuit board assembly, you should take a short rest and when we return we will inspect the circuit board for any possible short circuits or cold solder joints Pick up the circuit board with the foil side of the circuit facing upwards toward you First inspect the circuit board for possible cold solder joints All of the solder joints should look clean, bright and shiny If any of the solder joints look dark, dull or blobby, then you should un-solder that particular joint, remove the solder then re-apply some solder and resolder the joint all over again After inspecting all of the solder joints, we can move on to looking for short circuits Often sticky rosin core solder will leave a residue on a circuit board When excess component leads are cut from the board during assembly, many times the cut leads will stick to the circuit board and they can bridge across the circuit pads and cause a short circuit which could damage the circuit when first powered-up Another potential cause for a short circuit is a small solder ball which may have stuck to the circuit board, this too can cause a short circuit Once you have inspected the circuit board to your satisfaction, you can connect up the power supply leads to the power input jack and you will be ready to test the weather satellite receiver
Twenty-three: Weather Satellite Receiver
Circuit test
First, turn all three front-panel pots fully anticlockwise, connect up your antenna to the antenna input connector, and then apply power from a suitable 14 18V DC wall-wart power supply or a 12V battery Check that the green power LED immediately begins glowing If it does, check the voltage on REG1 s output lead (ie the right-hand lead) with your multi-meter, it should read close to +12V with respect to ground Similarly, the voltage at REG2 s (right-hand) output pin should measure very close to +6V If you now plug an 8 ohm speaker into CON3 terminals, and then turn up audio gain control VR3, you should hear a small amount of hiss and noise When you turn up the RF gain control VR1 as well, this noise should increase a little further but LED1 shouldn t begin glowing except only very faintly when VR1 is turned fully clockwise Now turn VR1 fully anticlockwise again and use your multi-meter to measure the DC voltage at the top of the 390k resistor located just behind transistor Q2 (ie to the right of 51V Zener diode) The voltage across this resistor should be less than 030V and preferably about 026V If it s any higher than 030V, the IF amplifier in IC1 may be unstable Assuming that your receiver has passed all these tests, it should be working correctly and is now ready for alignment
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