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Neophyte |
| Does not let deceive for the simplicity. The Neophyte is an excellent receiver advantages 40 meters (7 MHz) what it surprises for the quality of sound and stability. |
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Down we have the electric scheme of the receiver. The sign originating from the antenna is mixed in the first CI with the sign of the local oscillator, the result of the mixture is a sign of audible level in the pins 4 and 5 that pass by a circuit of filter before being amplified by the according to CI. The variable capacitor can be it of the plastic type used in small receivers.
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The electric scheme down alters the system of sintonia, now done by a ceramic ressonador of 7,151MHz and instead of variable capacitor is used one diode varicap. The only alteration of the previous healthy circuit the capacitores C7 and C8 that start to have 100pF NP0. The too component ones are the same as the previous circuit. The covering in this configuration goes of 7000MHz to 7160MHz with very good stability.
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It is possible to try T1 and T2 by yourself, istead use 10,7MHz commercial FI (FI of FM). Using form of 6mm with variable reel, he is made with 30 turns primary and 4 in the secondary, use LITZ wire. The result was the same thing with the 10,7MHz TOKO FI.
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The PCB show down is the first version, measure 5cm x 7cm, you can be made the download of the postcript file.
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