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Capacitors.
80m ARDF receiver.
pa0nhc ARDFrx80-7 20140909

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IMPORTANT: solder all mass connections (of ceramic Cs) on both top- and bottom copper surfaces (temp=300 C).
If needed, bend wires to fit the PCB. Keep the connections of capacitors SHORT for a high SRF.

Part

Details

Conrad
orderNr

C4,5,36,37,203,204

220p NP0  RM2.5

451466

C6

3n3 FOIL  RM5

455040

C7

20p NP0  (15p+4p7 parallel) for a tuning range of ca. 100kHz.
Changing C7 will change the tuning range (18-22p).
REM: (Smaller value for C7) = (Wider tuning range).

(451260
+
451232)

C3 100n FILM 500871

C8,34,35,39,41,
45,47,102,103,106

100n cer.

531855

C9

10uF elco (no tant.)

421986

C10

1uF cer. (low Q to prevent peaking noise).

453382

C11,13,15,16,17,18,23,
24,43,205

22n cer. RM5.

531808

C12,40

100uF, max d=6.3 - RM2.5

443906

C14

1000uF 6.3V. max d=8 - RM3.5

422024

C25

56p NP0  RM2.5

457191

C28 27p NP0

451300

C30,31

150p  (RM5)

451419

C32

4n7 FILM RM5 (! NO ceramic : they are microphonic!)

455059

C33

3.3uF RM2.5 tantalium

481696

C38

1u5. d=5, RM2   (elco or tantalium)

447029

C46 22n FILM 455350
C48,49 47p (100V) 451328

C101

47p 500v

451711

C104

189p NP0  (150pF on top + 39pF on bottom)

451419
457191

C105

 

30pF  4.5x3.2 mm SMD trimmer type TZC3 (Green).
Soldered on TOPcopper.
Adjust C105 for max signal when tuned at a test signal of 3.55 MHz.

447417

C107,108

1n   RM2.5

451602

C110

2-6pF NP0  4.5x3.2 mm SMD trimmer type TZC3 (Blue).
Soldered on TOPcopper.
Adjust C110 (!! NOT L2 !!) for 14.190MHz oscillator signal (R5 in lowest tuning pos.)

447418
C111 10pF NP0 457124
C202 22p NP0 (18p if lower sideband reception is most important) 451287

C207

4p7

451232