The output impedance is 50 ohms.

Mike


On Sat, Sep 22, 2018 at 12:32:55AM +0000, Gavin Jacobs wrote:
>
> What is the output impedance when transmitting at 147.42 MHz with and without 
> the output amplifier?
> 
> I’ve built an RF amplifier to boost the output about 26 dB, but with no 
> signal it oscillates. The data sheet suggests it is probably due to an 
> impedance mismatch between the Hackrf and the amp. So, can anyone say 
> definitely the impedance of the Hackrf?
> 
> Thanks,
> Jake
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