FR-220
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13
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16. Install R5, 470 ohms [yellow-violet-brown].
2. SA602 OSCILLATOR-MIXER and VARACTOR TUNING
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17. Install R6, 270 ohms [red-violet-brown].
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18. Install C7, a .001 uf bypass capacitor (marked .001 or 102).
In installing the SA602 IC, you may wish to use an 8-pin DIP socket
rather than soldering the IC directly to the board. Reasons for doing this
might include the peace of mind of beginners afraid of damaging the IC,
or experienced builders testing the merits of the SA602's cousin, the
SE602. However, please be aware that we have seen more service
problems with improper socket insertion than from soldering heat
damage to IC's. Even if this is your first IC, don't be afraid to use enough
heat to make 8 clean connections, but DO be sure to orient the end
marked by a band or dot IC correctly. Before soldering, make sure that
the IC or socket is perfectly flat against the top of the PC board.
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19. Install U1, the SA602 in accord with the preceding directions.
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20. Install the FL1 ceramic filter. This component is a brown, molded
"blob" with 3 leads and may be installed either way.
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21. Install jumper wire JMP4. Use a scrap component lead wire bent
into a small loop that connects the two PC board holes. Jumpers act
as "bridges" over PC board traces underneath.
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22. Install C8, .001 uf (marked .001 or 102).
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23. Install C10, 4.7 or 5 pf.
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24. Install R7, 10K [brown-black-orange].
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25. Install C9, 4.7 or 5 pf.
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26. Install C11, 27 pf.
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27. Installation of L3. It is important that the body of this coil be snug
against the PC board for mechanical stability, which directly affects
the frequency stability of the receiver. Make good, solid solder
connections!
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28. Install C12, 2 or 2.2 pf.
Содержание FR220
Страница 8: ...FR 220 8 U2 3359 FR220 BLOCK DIAGRAM U1 SA602 MIXER...
Страница 9: ...FR 220 9 FR220 PARTS LAYOUT DIAGRAM...
Страница 14: ...FR 220 14...
Страница 15: ...FR 220 15...