The 2.4 GHz Bandalyser

See what’s happening on the band

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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Gerber file

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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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PCB Service

Extra info, Update

- Scans all 84 channels of the 2.4-GHz band approximately 20 times per second
- Displays the maximum value measured in each channel
- Each frequency channel can optionally be measured several times in succession
- The entire 2.4-GHz band can optionally be scanned several times in succession
- 3.3 V operating voltage, stabilised by a low-drop voltage regulator
- Serial port for future expansion
- Built-in transceiver module allows the unit to be used for other (wireless) applications

Component list

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

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