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ANTENTOP- 01- 2007, # 009

Simple SWL HF- VHF Receiver

 

Table 1. Data for inductors

# Inductor

Diameter of the Inductor, mm

Length of winding,

mm

Quantity of Coils

Note

L1

 

14

10

8

Athwart to L2, L3

L2, L3

 

14

20

7

 

L4

 

14

5

4

 

L5

 

14

10

7

Athwart to L6, L7, L8

L6

 

14

20

11

 

L7

 

14

20

14

 

L8

 

14

10

6

 

L9

 

18

25

7.5

 

L10

 

18

4

2

Near “cold” end L9

L11, L12

18

14

8

Tap from 2 Turn from “cold”  end

Superregenerative stage adjusted with R11 and C10. When superregenerative stage is working properly you hear specific noise in the speaker. Frequency of the stage (IF) set up with help of C11. After that do tuning L12C15 to maxima sensitivity of the receiver.

 

 

Audio Amplifier made from good parts according to the schematic works straight away. Almost any low power, low noise (better high- gain) transistors work well at the receiver. Transformer TP3 was used from an old transistor radio. Was used a 16 Ohms Speaker from an old transistor radio. It is possible (ever better) switch on a high- impedance head phone instead the TP3.

 

 

Parts List

 

Resistors:

 

R1: 1 k

R2 100 k

R3: 15 k

R4: 10 k

R5: 100 k

R6: 120 Ohm

R7: 1.2 k

R8: 8.2 k

R9: 5.1 k

R10: 10 k

R11: 100 k , potentiometer

R12: 8.2 k

R10: 10 k

R11: 100 k , potentiometer

R12: 8.2 k

 

K = multiply to 1000 Ohm

All resistors 0.125 W

 

Capacitors:

 

C1: Variable, air dielectric, 10- 100 pF

C2: Variable, air dielectric, 2- 15 pF

C3: 22 pF

C4: 560 pF

C5: 0.05 uF

C6: 6800 pF

C7: 3300 pF

C8: 3300 pF

 

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Last Updated:

August 2, 2016 23:33

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