FX 146
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96
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E20. Install R35, upright, 100K ohm (brown-black-yellow). R35 is
between positions for D5 and C62.
Steps E1-E20 are presented as a group primarily as a help in visualizing the
location of the VCO on the PC board. You have built up the VCO itself and
the capacitance multiplier voltage filter provided by C40, Q4, etc. After
double-checking the accuracy of your work, proceed with installing the VCO
related components in Stage F.
Stage F: VCO Buffers, PLL Synthesizer, ÷65/64 Prescaler
Install the following group of parts for Q5:
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F1. C45, 100 pf disc capacitor (marked 100 or 101).
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F2. C52, .001 uf disc capacitor (marked .001 or 102).
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F3. R26, 51 ohms, (green-brown-black).
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F4. R27, 47K, upright (yellow-violet-orange).
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F5. R20, 270 ohm, upright (red-violet-brown).
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F6. R23, 100 ohm, upright (brown-black-brown).
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F7. Install Q5, NPN type 2SC2498. Be sure to select the correct
transistor type and to orient the flat side as pictured.
Install these capacitors associated with U3:
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F8. C21, 10 pf disc capacitor (marked 10).
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F9. C46, 100 pf disc capacitor (marked 100 or 101).
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F10. C50, 100 pf disc capacitor (marked 100 or 101).
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F11. C38, .001 uf (marked .001 or 102).
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F12. C57, .001 uf (marked .001 or 102).
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F13. Install C32, 100 pf disc capacitor (marked 100 or 101).
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F14. Install Q16, NPN type 2SC2498. Be sure to select the correct
transistor type and to orient the flat side as pictured.
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F15. Install R106, 10K ohm (brown-black-orange).
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F16. Install R105, 100 ohm (brown-black-brown).
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F17. Install L21 near R105. This .33 uH. molded inductor is quite small,
green body with 2 orange stripes. Before soldering, make sure there is
no excess wire length above the board.
FX-146
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51
[ ] [ ] C24
.001
M16
[ ] [ ] C25
100 pF
DR6
[ ] [ ] C26
.01
CR14
[ ] [ ] C27
8.2 pf
DR8
[ ] [ ] C28
47 pf
DR19
[ ] [ ] C29
330 uF electrolytic
B7
[ ] [ ] C30
47 pf
DR17
[ ] [ ] C31
47 pf
DR22
[ ] [ ] C32
100 pf
F13
[ ] [ ] C33
.01
B4
[ ] [ ] C34
470 uF
B6
[ ] [ ] C35
100 pf
F18
Couples VCO output to U1
[ ] [ ] C36
.01
E12
[ ] [ ] C37
.01
B8
[ ] [ ] C38
.001
F11
[ ] [ ] C39
.001
E14
[ ] [ ] C40
47 uF elec.
E13a
VCO +DC filter with Q4
[ ] [ ] C41
.1
B5
[ ] [ ] C42
1500 uf elec.
A5
DC input filtering
[ ] [ ] C43
.001
E2
[ ] [ ] C44
.001
TX8
[ ] [ ] C45
100 pf
F1
[ ] [ ] C46
100 pf
F9
[ ] [ ] C47
100 pf
DR4
RF coupling: antenna to RX
[ ] [ ] C48
4.7 or 10 uf
B2
[ ] [ ] C49
100 pf
F1
[ ] [ ] C50
100 pf
F10
[ ] [ ] C51
22 pf
E4
[ ] [ ] C52
.001
F3