Ramsey Electronics FX-440 Manual page 139

1
1
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I I
TX25: C59, .001 uf.
i . . ·-·
''l-+-I~,1~TX26: L13, .5 turn hand-wound coil you made in step TC2.
[ . . I [ I
TX27: C55, .01 ut.
I ] [
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TX28: C74, 20 pf. trimmer (white ceramic body).
[ ·I [)
TX29: C84, 20 pf. trimmer (white ceramic body).
[ ] [ 'l\
TX30: C64, 27 pf.
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[ ] [
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TX31: L8, 2.2 uH molded inductor (2 red, 1 gold and 1 black
·1band).
At this point, every single PC board component has been installed except
for L 10, R32 and L9, which apply power to the RF output transistors
(driver 09, final 08). DO NOT INSTALL these parts until instructed to do
so during the Transmitter Completion and Tuneup procedure .
.stage TX: FINAL PROGRESS CHECK:
[ ] 1. Double check component selection for Steps TX1 -TX31.
[ ) 2. Use bright light and magnifier to go over entire board to check for
missed connections or solder bridges. If you suspect a solder
bridge, simple review the X-ray illustrations to see whether the
points in question are indeed to be tied together.
I ]
3. Carefully check entire board for:
• Loose bits of wire lodged among connections or components on
either side of board.
• Excess wire lengths which may not have been nipped and are
now bent flat, probably against another connection.
TRANSMITTER COMPLETION AND TUNEUP
Do not proceed with the following until ALL of the preceding steps have
been completed successfully.
[ ] [ ] TX32. Disconnect DC power and antenna
I ) [ )
TX33. Install L10, . 015 uH coil and ferrite bead assembly. This
assembly is the same as the one in step TX15.
( ) ( ) TX34. Install L9, .015 uH coil and ferrite bead assembly. This
assembly is the same as above.
[ ] [ ] TX35. Install the press-on heatsink to the case of 08.
FX-440 Assm. 77