FR-220
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12
Also, if you plan to use an enclosure other than the custom Ramsey
enclosure and knob kit, you may wish to locate the controls differently
than provided by the PC board. In this case, the control lugs are wired to
the PC board using your own insulated hookup wire, kept as short as
possible for neat installation.
FURTHER COMPONENT INSTALLATION
All "directions" on the PC board (i.e.: right, left, above, below and so
forth) assume orientation of your board as shown in the parts layout
diagram. Therefore the rear of the board (connectors) is the lower end,
and the front (controls) is the upper end.
1. ANTENNA INPUT AND TUNED RF PREAMPLIFIER
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5. Install C1, 4.7 or 5 pf disc capacitor.
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6. Install C2, 2 or 2.2 pf.
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7. Install C3, 10 pf.
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8. Install L1, a small 4 turn wire coil. Gently stretch the coil just
enough so that it's two wire leads fit firmly into the PC board holes.
Solder both leads securely. This coil is designed to permit additional
stretching or compressing as part of the alignment process.
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9. Install C4, 10 pf.
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10. Install L2, the other 4 turn coil just like L1 above.
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11. Install C5, 4.7 or 5 pf.
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12. Clearly identify Q1, the 2SC2498 or 2SC2570A transistor. Do not
confuse it with the other transistors supplied.
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13. Position Q1 as shown on the PC board layout, with the flat side
facing to the right, toward the middle of the board. Press the
transistor snugly into the PC board so that only a minimum amount
of wire lead is exposed above the board. In soldering, don't be
afraid to use enough heat to make good clean connections.
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14. Install R4, 47K, just to the left of Q1 [yellow-violet-orange].
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15. Install C6, 100 pf (marked 100 or 101).
Summary of Contents for FR220
Page 8: ...FR 220 8 U2 3359 FR220 BLOCK DIAGRAM U1 SA602 MIXER...
Page 9: ...FR 220 9 FR220 PARTS LAYOUT DIAGRAM...
Page 14: ...FR 220 14...
Page 15: ...FR 220 15...