2-metre band converter
capture 144 MHz DX signals

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Materials
Gerber file
CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor GREEN and GOLD members can exclusively download these files for free as part of their membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service.
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Component list
R1,R4,R10 = 150k?
R2,R9 = 2k?2
R3 = 180k?
R5 = 560?
R6 = 47k?
R7 = 100k?
R8 = 1k?
R11 = 56?
P1 = 1k? preset H
Capacitors:
C1,C7,C8,C10,C11,C14 = 22pF trimmer
C2 = 27pF
C3,C6,C9,C12,C18 = 10pF
C4 = 15pF
C5,C16 = 40pF trimmer
C13 = 4pF7
C15,C19 = 1nF, raster 5mm
C17 = 22pF
C20,C22-C25 = 100nF ceramic
C21 = 10µF 63V radial
Inductors:
L1 = 0.22µH miniature choke
L2 = 0.33µH miniature choke
L3-L7 = 5 turns silver-plated wire, dia. 0.8mm (SWG20), internal diameter 4.5mm, length 10mm Distance between coupled inductors: 1mm, tap at 2 turns from ground side
L8 = 0.56µH miniature choke
Semiconductors:
T1,T2 = BF494
T3,T5 = BFR91
T4 = BF961
Miscellaneous:
X1 = quartz crystal 38.667MHz (3rd overtone) (Mainline, tel. 0870 2410810)
PCB, order code 000013-1
Case: e.g. Hammond 1590B 56×107×25 (inside dimensions)
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