In all cases, adjust the receiver tuning knob so that the audio tone is in the range of about 500 to 2000 Hz. In the event that no test equipment is available, then a fourth method simply relying on the ear is possible. For this reason three different methods are described, each using a form of test instrument. For some, it is difficult to discern slight changes in the strength of an audio tone simply by ear. (When the receiver tunes 20.00 MHz with the nob set to the 10 o clock position it will tune 20.1 MHz with the knob centered on the 12 o clock position.) The following steps involve adjusting variable capacitors (C2 and C6) and a variable inductor (L4) to obtain the maximum signal strength (loudest tone) at the audio output. Once L5 has been set, DO NOT readjust it during the remainder of the alignment procedure. The signal which you hear is generated in OSC1, a crystal controlled test oscillator built into the receiver. By adjusting L5 to hear the tone, you are tuning the receiver to 20.00 MHz. Caution: Do not screw down the inductor slugs too far, as the ferrite material could crack. Carefully adjust inductor L5 with the white tuning stick until a loud low frequency tone is heard in the speaker (set volume control as desired). Set the TUNING control to the 10 o clock position. Allow the receiver to warm-up for several minutes. Set the volume control to the 12 o clock position. If you are using headphones, hold them several inches from your ear as there may be a loud whistle due to the internal test oscillator. If you are using a Radio Shack amplified speaker, turn it ON and adjust the volume control on the speaker up about 1 8 turn. These jacks accept 3.5 mm (1 8 ) monaural or stereo plugs. Connect either headphones or an amplified speaker (Radio Shack 277-1008C or equivalent) to the receiver audio output (J3 or J4). Next, turn the Jupiter receiver s power switch to OFF.
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The Radio Shack RS 23-007 (Eveready) 12 volt battery or equivalent is suitable.
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This is the wire that is connected to the center conductor of the plug and must be connected to the (+) side of the power source. Notice that the power cable has a black stripe, or tracer, along one of the wires. The power cable supplied with the kit has a female power plug on one end and stripped leads on the other.