Ramsey Electronics FR146 manual Progress Summary

PROGRESS SUMMARY

So far, you have wired the tuned input from the antenna, the RF preamplifier, and the SA602 mixer-oscillator, including the varactor tuning circuit. The work you have done has actually formed a simple receiver capable of tuning in VHF signals of all kinds and converting them to a low-level 10.7 MHz output to be amplified by Q2. This is a good time to review the steps completed to this point before proceeding. Due to the many functions of the MC3359 FM receiver IC, further assembly steps will be in the order of easiest parts installation.

3.TRANSISTOR COUPLING & AFC CIRCUITS, VOLUME & SQUELCH CONTROLS

❒36. Install Q2, a 2N3904 transistor. Correctly position the flat side.

❒37. Install R13, 47K ohms (yellow-violet-orange).

❒38. Install C20, .001 uf (marked .001 or 102).

❒39. Install R12, 1K ohms (brown-black-red).

❒40. Install Q3, 2N3904 transistor.

❒41. Install R10, 1 megohm (brown-black-green).

❒42. Install R11, 1K ohms (brown-black-red).

❒43. Install R22, 2 ohms (red-black-gold).

❒44. Install C29, .01 uf (marked .01 or 103 or 10nf).

❒45. Install C30, 10 uf electrolytic, observe correct polarity.

❒46. Install R18, 18K ohms. (brown-gray-orange).

❒47. Install C28, .01 uf (marked .01, 103, or 10nf).

❒48. Install R19, 10k ohms (brown-black-orange).

❒49. Install jumper wire, JMP2.

❒50. Install C34, .1 uf (marked .1 or 104).

❒51. Install R21, 47K ohms (yellow-violet-orange).

❒52. Install C35, 100 to 220 uf electrolytic, observe polarity.

❒53. Install R20, 270 ohms (red violet-brown).

❒54. Install Q4, 2N3904 transistor.

FR146 • 15