The 2.4 GHz Bandalyser

See what’s happening on the band

Published in issue 2/2010 on page 54

The 2.4-GHz band is frequently used nowadays for wireless links between all sorts of devices. This often leads to problems with wireless local area network (WLAN) links when different networks close by operate on the same channel. With this handy portable scanner, you can quickly and easily see which frequencies are being used in your area and which channels you should avoid for your own wireless network links.

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Products

Components

Resistors
R1,R2,R3,R7,R8,R9 = 10kOhm
R4,R5,R6 = 270Ohm
Capacitors
C1,C2,C3 = 100nF
C4,C7 = 10µF 16V radial
C5,C6 = 22pF
Semiconductors
D1 = 1N4001
IC1 = LD-1117V33 (ST Microelectronics)
IC2 = ATmega324-20A (programmed, Elektor Shop # 090985-41)
MOD1 = CYWM6935 module (Farnell # 1319925/1321748; RS Components # 382-620)
Miscellaneous
X1 = 11.0592MHz quartz crystal
K1 = 6-pin (2x3) pinheader
K2 = 4-pin pinheader
S1 = miniature switch
S2,S3,S4 = pushbutton, 5mm, PCB mount
6-pin (2x3) connector for MOD1, lead pitch 2mm
LCD for Nokia 3310 mobile phone (search 'Nokia 3310 display' on Ebay)
9V battery with clip-on leads, or 4 AA or AAA cells with holder
Project software # 090985-11 and Eagle file for PCB # 090985-1