Ramsey Electronics FR6 manual Progress Summary

❒37. Install jumper JMP1.

❒38. Install jumper JMP3.

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 so far 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 so far 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

❒39. Install Q2, a 2N3904 transistor. Observe correct positioning of the flat side.

❒40. Install R13, 47K ohms [yellow-violet-orange].

❒41. Install C20, .001 uF [marked .001, 102, or 1 nF].

❒42. Install R12, 1K ohms [brown-black-red].

❒43. Install Q3, 2N3904 transistor.

❒44. Install R10, 1 megohm [brown-black-green].

❒45. Install R11, 1K ohms [brown-black-red].

❒46. Install R22, 2 ohms [red-black-gold].

❒47. Install C29, .01 uF [marked .01, 103, or 10 nF].

❒48. Install C30, 4.7 or 10 uF electrolytic, observe correct polarity.

❒49. Install R18, 18K ohms [brown-gray-orange].

FR6 • 14