Elenco Electronics AM-550TK Instruction Manual download pdf (Page 25)

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ASSEMBLY INSTRUCTIONS - ANTENNA, MIXER AND OSCILLATOR

L1 - Antenna with Holders

(see Figures I & J)

C2 - .02μF or .022μF Discap

(marked 203 or 223)

TP1 - Test Point Pin

(see Figure A)

R2 - 12kΩ Resistor

(brown-red-orange-gold)

R3 - 3.3kΩ Resistor

(orange-orange-red-gold)

IMPORTANT: Before installing the antenna coil, determine if you have a 3 wire coil or a 4 wire coil. Assemble it to the

PC board as shown below. Mount the antenna assembly to the PC board.

Put the tab of the first holder into the right hole and twist the tab 90

Slide the ferrite core through the antenna coil and the holder. Cut the second holder as shown.

Put the tab of the second holder into the left hole and twist the tab 90

Slide the ferrite core through the holder. Make sure that the ferrite core sticks out 1/2” on each side.

3 Wire Type Antenna: Solder the 3 colored wires to

the PC board: Wire A (red) to the hole marked

“RED”, Wire B (black) to the hole marked “BLK” and

Wire C (white) to the hole marked “WHT”.

4 Wire Type Antenna: Solder the 4 colored wires to the PC board: Wire A (green) to the

hole marked “RED”, Wire B (red and black twisted together) to the hole marked “BLK” and

Wire C (white) to the hole marked “WHT”.

Figure J

Tabs Tabs

1/2”

C (white)

B (black)

A (red)

C (white) B

A (green)

Twisted Together

Red

Black

A (green)

Red

Black

B Twisted Together

C (white)

1/2”

White

Black

Red

White

Black

Red

Green

}

R=9 - 11Ω

R=1 - 1.5Ω

R=9 - 11Ω

R=1 - 1.5Ω

4 Wire

3 Wire

Figure I

Determine if you have a three wire or four wire

coil. Resistance measurements will be used to

check the configuration of the coil. Slide one

holder off the ferrite core of the antenna

assembly. Then slide the coil off the the ferrite

core. Measure the resistance of the coil. Your

readings should match the approximate values

as shown.

Note: If the end of a wire from the antenna

should break off, strip the insulation off the end

with a hot soldering iron. Lay the wire down on

a hard surface and stroke the wire with your iron.

The insulation should come off very easily.

CAUTION: The soldering iron will burn the hard

surface that you are working on.

}

R1 - 56kΩ Resistor

(green-blue-orange-gold)

L2 - Oscillator Coil (red)

Q1 - 2N3904 Transistor NPN

(see Figure C)

C3 - .01μF Capacitor

(marked 103)

C1 - Tuning Gang Capacitor

2 Screws M2.5 x 3.8mm

Knob (dial)

Screw M2.5 x 8mm

Label (dial knob)

(see Figure K)

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Elenco Electronics AM-550TK Instruction Manual Page 25

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