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21% OFF SANWU® 50W + 50W TDA7492 CSR8635 Drahtloses Bluetooth 4.0 Audio Empfänger Verstärker Board NE5532 Preamp US$15.74 US$19.99 View It

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oskar2016 16/02/2018

The bluetooth range is very short can be improved by adding a cable here I leave some notes: The pcb antenna is calculated to match with the tcvr, and you just can't measure it's length! There are a lot of things like shortening factors, imedance, and other stuffs you have to calculate in. With this mod, i'm sure you unmatch the impedance, and at a higher transmit powers (like PA+LNA version) it could kill your transmitter! If you want to do the correct way, you should disconnect the entire antenna with a cut after 2-3mm, and solder a wire antenna on. The proper size should be l=((C/F)/4)*0.96, where C is 300, F is the freq, like 2450MHz (center of the band), and 0.96 is the free air velocity factor: l=(300/2450)/4*0.96 gives you to cut 29.4mm bare wire for a quarter wave antenna. You can read more about here: https://en.wikipedia.org/wiki/Velocity_factor https://en.wikipedia.org/wiki/Monopole_antenna

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