Ramsey Electronics AM25 Bedienerhandbuch PDF herunterladen (Seite 14)

AR1 • 14

 36. Install FL1, the 10.7 MHz ceramic filter. It has three wire leads and

may be installed either way.

 37. Install C16, .001 µF (marked .001 or 102).

 38. Install R28, 270 ohm [red-violet-brown].

 39. Install R10, 1 megohm [brown-black-green].

 40. Install Q2, 2N3904. Observe position of flat side.

 41. Install R11, 1K [brown-black-red].

 42. Install C19 and C20, both .01 µF (marked .01 or 103 or 10nf).

 43. Install U2, MC1350. Be sure that the end with the dot or notch is

positioned correctly.

 44. Install R25, 1K [brown-black-red].

 45. Install R26, 22K [red-red-orange].

 46. Install C17, .01 µF (marked .01 or 103 or 10nf).

 47. Install L7, the shielded 10.7 MHz IF transformer. Its pins fit into the PC

board only one way. Solder all connections.

 48. Install C31, 4.7 to 10 µF electrolytic, observe polarity.

 49. Install diode D2, 1N270. It is larger in size than the remaining small

diode and marked with red-violet-black bands. The red banded (cathode)

end must be pointed toward the battery side of the board.

 50. Install C30, .01 µF (marked .01 or 103 or 10nf).

 51. Install R12, 10K [brown-black-orange].

At this point, you have installed more than half of the PC board components for

one of the more complex of all Ramsey kits. By wiring the receiver in the order

suggested so far, you have already constructed a basic, working single-

conversion AM receiver able to tune the aircraft band. With an antenna

connected, R1 installed and DC voltage correctly applied to what has been

wired so far, a sensitive test amplifier connected to the cathode of D2 could let

you hear aviation signals right now. However, we think you'll agree that

completing your receiver is a more intriguing project.

THE LM324 CIRCUITS

 52. Install C21, 4.7 to 10 µF electrolytic. Observe correct polarity.

 53. Install R13, 33K [orange-orange-orange]. Install R14, 1 megohm

[brown-black-green].

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Ramsey Electronics AM25 Bedienerhandbuch Seite 14