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AA7 • 6
figure of the amplifier circuit which amplifies the signal from the antenna rod
before it gets to the receiver's RF input.
We mention these things, with no need to get into a lot of engineering
detail, just to let you know that "Active Antennas" are a serious topic among
contemporary receiver designers, and that we did our homework in bringing
you the economical AA7.
AA7 ACTIVE ANTENNA KIT PARTS LIST
Please verify that the following items are present before starting assembly.
CAPACITORS
1 100 pF disc capacitor (marked 100 or 101) [C3]
4 .01 µF disc capacitor (marked .01, 103 or 10nF) [C1, C2, C5, C6]
1 4.7 µF to 10 uF electrolytic capacitor [C4]
RESISTORS
1 100 ohm (brown-black-brown) [R4]
2 100K ohm (brown-black-yellow) [R3, R6]
1 220K ohm (red-red-yellow) [R2]
1 1M ohm (brown-black-green) [R1]
1 10K ohm PC mount potentiometer [R5]
SEMICONDUCTORS
1 Dual gate MOSFET transistor (4 pins) [Q1]
1 2SC2498 or 2570 NPN VHF transistor [Q2]
CONTROLS AND HARDWARE
2 DPDT push switches [S1, S2]
2 PCB- mounted RCA jacks [J1, J2]
1 9 volt battery hold-down clamp
1 9 volt battery snap connector
1 Telescoping whip antenna with mounting screw
REQUIRED, NOT SUPPLIED
1 9 volt battery (alkaline or heavy-duty)
OPTIONAL
1 Ramsey case and knob kit, or your own enclosure
1 LED “power on” indicator and 1K ohm resistor
1 External antenna terminated in RCA-type plug
REQUIRED TOOLS
Soldering Iron (Radio Shack #RS64-2072)
Thin Rosin Core Solder (RS64-025)