•SOLDER ALL wires or pins of the part, whether the 2 wires of a resistor or the 3 or 4 wires of a transistor.
•Trim or Nip all excess wires extending beyond each solder connection, taking care that wire trimmings do not become lodged in
Soldering the AA7 Printed Circuit Board
1. Install J1, the RF input jack. Notice that it is connected directly to the screw hole for the extendable whip antenna. Solder all 4 points of the jack secure!
2. Install S1, one of the two push switches. Position it so that the plunger of the switch extends over the edge of the PC board. It fits correctly only one way and is on the same side of the board as J1, which you have already installed. Notice that this switch selects which preamplifier circuit will be used. We'll wire the VHF circuit path first, because it's a little easier. Solder all six points of the switch.
3. Install C3, 100 pf. immediately behind S1.
4. Install R6 100K
5. Notice that Q2, the 2SC2498 transistor is installed with the flat side facing the rear (antenna and receiver jacks) of the
6. Using a scrap component lead wire, install jumper wire 2 (JMP2) near S1. This connects the preamp that is selected by S1 to the coupling capacitor for the receiver jack.
7. Similarly, install JMP1. (This connects the J2 receiver jack directly to J1 and the whip antenna when S2 is in the out or off position.
8. Install R4, 100 ohms
9. Install C6, .01 µF. which couples the output of the selected preamplifier path to the J2 receiver jack.
10. Install C2, .01 µF. When S1 is in the "out" or HF position, C2 couples the RF input to the Dual gate MOSFET preamplifier you are about to build.
11. Install R1, 1 megohm
12. Install R2, 220K ohms
13. Install C1, .01 µF.
AA7 • 10
