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Six: Solid-State FM Broadcast Receiver
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A hex head alignment tool is required to tune up your FM receiver If you do not already have a set of plastic or nylon coil alignment tools and expect to build other radio or transmitter type kits, such tools are well worth having and can be found at any electronics store, including Radio Shack While a hex style Allen wrench will fit the coil slug, the metal itself will drastically change the coil s inductance while it is in the slug For this reason you should not use an Allen wrench unless you don t mind the trial and error process of turning the slug, withdrawing the tool, checking tuning, reinserting the tool, re-tuning, checking and so on You can fabricate your own non-metallic tuning tool with some patience, a bit of sandpaper and a piece of plastic rod Try a large wooden matchstick, kebab skewer, or small plastic crochet needle Carefully sand down the end to a hex shaped form and check for proper fit within the coil slug It is better to have the
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tool fit loosely rather than too tight, since a tight tool will cause stress on the delicate slug
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Make sure the slug is about three turns from the top of the coil form Calibrating the receiver is easy First tune in a station known to operate at the low end (88 MHz) of the FM broadcast band Rotate the tune control almost fully counter-clockwise to where that station should logically be located on the dial Turn L1 s slug until that same station is received The tune control should now tune in the entire FM broadcast band An easy way of making your own dial is to paste a small rectangle of paper behind the tuning dial knob Then as you tune in different frequencies, pencil in on the paper the received frequency
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Six: Solid-State FM Broadcast Receiver
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Connect up a fresh 9 volt battery (preferably heavy duty alkaline type), a speaker or earphone, a short length of wire (about two feet) to serve as antenna, or the telescopic whip if the optional matching case and knob set was purchased Now, set the volume and the tuning controls to the center of their range, then press the power switch ON, you should hear some rushing noise from your speaker Next, rotate the volume control and see if it does its job, then slowly turn L2 s slug back and forth for maximum noise This noise should be similar to what you would hear when a regular FM radio is tuned between stations L2 may be tuned with a regular blade style screwdriver Try turning the tuning control, and see if you can receive any stations, but don t be alarmed if nothing is received since we haven t adjusted the oscillator coil yet The oscillator coil, L1, is adjustable to receive from 70 to 110 MHz We have to adjust it to cover the frequency range of interest For alignment purposes we ll work with the understanding that the standard FM 88-108 MHz band is what we wish to receive Using an insulated alignment tool, slowly rotate L1 s slug gently so that the slug is even with the top of the coil form (Do not force the slug; if it binds, rotate the slug back and gently rock it to-and-fro as you would a thread forming tap Slugs are by nature very brittle and will crack easily) Now carefully rotate the slug into the coil form seven turns The slug will be in about 1 4 Rotate the tune control until you hear an FM broadcast signal Adjust L2 for best sound Install R9, 10k ohm (brown, black, orange) R9 adds in AFC voltage to stabilize against drift Without it your radio may wander After a signal is received, rotate the tune control to receive other stations If the stations seem to jump away as you try to tune one in, the coil L1 is adjusted incorrectly and should be re-tuned The reason for this odd phenomenon is that the AFC circuit is pushing the signal away rather than pulling it in This is caused by having the oscillator 107 MHz below the desired signal rather than 107 MHz above it A similar example of this is closing your eyes, hearing a sound, but not being able to determine if it is in front of, or behind you Readjusting L1 will correct this situation
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