[AudioI] SDR : software defined radio and frequency generation

[Ron Patton]

Hi Matt,

That is a bit of a loaded question.  There are number of methods that
SDR hardware generate RF.   Our products use Tayloe (quadrature IQ)
mixers.  Here is a link on how they work.
http://www.ripublication.com/irph/ijeee_spl/ijeeev7n4_08.pdf .

We use the AudioInjector Zero for the audio interface.  Flow diagram:

Receive:  Antenna (RF) -> Tayloe Mixer (I/Q Data) -> SDR engine with
PortAudio (digital audio)-> AudioInjector Zero -> analog audio -> speaker .
Transmit: Microphone (analog audio) -> AudioInjector Zero (digital
audio) -> SDR engine with PortAudio (I/Q data) -> Tayloe Mixer -> RF ->
RF Amplifier -> Antenna.

I will send a schematic if you would like to see the guts of the product.

73,
Ron / W4MMP

On 11/13/2021 22:30, Matt Flax via People wrote:
> On the topic of SDR,
>
> Does anyone on the list have setups which include hardware to synthesise
> RF frequencies ? How is that part done in hardware ?
>
> Matt
>
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> https://lists.audioinjector.net/mailman/listinfo/people
>
>
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