Assembly Instructions - Ramsey Electronics AA7B User Manual

ASSEMBLY INSTRUCTIONS

The following assembly steps are given in accord with the LEARN-AS-YOU-
BUILD philosophy for Ramsey Kits. To the extent that is reasonably possible,
parts are installed in the order of signal flow as depicted on the schematic
diagram, with some discussion of the components whenever useful.
Because the AA7B is of great interest to people who simply enjoy shortwave
listening and VHF monitoring, experienced ham operators should understand
that our instructions are addressed to people for whom this may be their very
first electronic kit project.
First Assembly Steps
Since you may appreciate some "warm-up" soldering practice as well as a
chance to put some "landmarks" on the AA7B PC-board, we first will install
some "hardware" components, to make the up-down, left-right orientation of
the PC board as clear as possible.
Soldering the AA7B Printed Circuit Board
1. Starting at the bottom-left of the board, install J1 the RF input jack.
Solder all 4 points of the jack securely!
2. Install C1, .01µF (marked .01, 103 or 10nF) above J1 and below U1.
3. Install C3, .01µF (marked .01, 103 or 10nF) on the other side of U1.
4. Install R1, 100k ohm [brown-black-yellow] near C3.
5. Install C4, .01µF (marked .01, 103 or 10nF) next to R1.
6. Install R5, 10k ohm [brown-black-orange] above and to the left of R1.
7. Install C2, .01µF (marked .01, 103 or 10nF) near C4.
8. Install R2, the RF gain control potentiometer at the top of the board.
Make sure it is seated securely and solder the three pins and two
mounting tabs.
9. Install R3, 150k ohm [brown-green-yellow] below R2.
10. Install R4, 180k ohm [brown-grey-yellow] to the right of R3.
11. Install R10, 10k ohm [brown-black-orange] above C2.
12. Install L1, 22 µH [red-red-black] to the right of C4.
13. Install R7, 220 ohm [red-red-brown] to the right of L1. Note:
Inductors L1 & L2 look similar to R7, but are slightly larger in
diameter. Make sure you are using the right component!
14. Install C6, .01µF (marked .01, 103 or 10nF) to the right of R7.
15. Install C7, .01µF (marked .01, 103 or 10nF) below C6.
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