Ramsey Electronics AR2 Bedienerhandbuch PDF herunterladen (Seite 16)

ABM1 • 16

 Install C4, 68pF ceramic disk capacitor (marked 68).

RF AMPLIFIER

 Install C5, 1nF ceramic disk capacitor (marked 102).

 Install C6, 5pF ceramic disk capacitor (marked 5 or 4.7). C6 is put in on a

45 degree angle. This is done to keep the foil run as short as possible as

part of good, standard RF (Radio Frequency) practice. Excess lead

length adds unwanted inductance in RF circuits.

 U1 is already installed.

 Install R1, 470 ohm resistor (yellow-violet-brown). This is another part put

in at a 45 degree angle for RF reasons. Resistors have no polarity and

can be installed in either direction. R1 is a one of three lay-down resistors

in the ABM1. It is important that the body rests flat on

the circuit board.

 Install C7, 100nF ceramic disk capacitor (marked 104).

 Install C9, 1nF ceramic disk capacitor (marked 102).

BAND-PASS FILTER

 Install C8, 1nF ceramic disk capacitor (marked 102).

 M3 and M4 are just like M1 and M2. They are made from foil runs on the

board. No actual components to install.

 Install C10, 68pF ceramic disk capacitor (marked 68).

 Install L4, 0.41uH 11t air core inductor (11 turns of wire).

 Install C11, 2.2 pF ceramic disk capacitor (marked 2.2). It is very

important that this part is placed as close to the board as possible.

 Install C12, 68pF ceramic disk capacitor (marked 68).

AM DETECTOR

 Install C13, 1nF ceramic disk capacitor (marked 102).

 Install R2, 51 ohm resistor (green-brown-black). This is the second lay-

down resistor. Install it just like R1.

 Install C14, 1nF ceramic disk capacitor (marked 102).

 Install C15, 5pF ceramic disk capacitor (marked 5 or 4.7).

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Ramsey Electronics AR2 Bedienerhandbuch Seite 16