Ramsey Electronics BS1 Manual de instrucciones descargar pdf (Pagina 23)

SG7• 23

 8. Install D1, the 1N4148 diode. Be sure not to confuse it with the special

1SS99 hot carrier diode which is smaller and has black and blue color

bands. Be sure that the banded (cathode) end is oriented correctly.

 9. Install Q1, 2N3904 transistor. The flat side must face D1, and the lead

wires of the transistor must be soldered on BOTH sides of the PC board.

Pre-form the leads and it will sit in position very nicely for soldering.

 10. Install R3, 1K ohms [brown-black-red].

 11. Install a jumper wire from BB to CC, taking care that it bridges PC

board trace DD without touching it. Remember to pre-tin BB and CC and to

handle the jumper with tweezers or pliers.

 12a. Before installing the next 4 parts, study the arrangement of R4,R5, Q2

and R6. Install these parts in the order suggested.

 12b. Install R4, 100 ohms [brown-black-brown].

 12c. Install R5, 100 ohms [brown-black-brown].

 13a. Before installing Q2, the NE021 transistor, make sure that all three

connection points are pre-tinned and that there is sufficient solder tinning

for easy installation of R6 after finishing Q2. Use tweezers to hold Q2

neatly in place for soldering.

 13b. Install Q2 per 13a. above.

 14. Install R6, 10K ohms [brown-black-orange].

 15a. Notice the pairs of holes at points EE and FF. At both points, a small

U-shaped jumper is installed and soldered on BOTH sides of the board.

(Folks like me who are not microwave geniuses might wonder why the PC

board trace for the antenna is shorted out straight to ground. The answer is

that this circuit trace as well as the adjacent strips for the base and collector

of Q2 are actual circuit components! Notice the schematic).

 15b. Using bare scrap wire, install the jumper at EE.

 15c. Install the jumper at FF. Be quick and CAREFUL so as not to damage

C7, the factory-installed SMT chip capacitor.

 16a. A length of tinned wire is supplied with your kit and is soldered to point

GG and trimmed to form the 2600MHz antenna. In soldering, concentrate

on keeping the wire straight and centered on the tinned strip. About 1/2-

inch of the wire should be soldered solidly to the strip.

 16b. Solder the antenna wire per 16a.

 16c. Trim the antenna lead wire to 1.1 inches from the edge of the board.

Measure carefully and cut the wire as required.

 17a. Careful installation of D2, 1SS99 (marked with black and blue bands)

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Ramsey Electronics BS1 Manual de instrucciones Pagina 23