The 2.4 GHz Bandalyser
See what’s happening on the band
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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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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