[AudioI] SDR : software defined radio and frequency generation

[Matt Flax]

I have a few questions :

Is it right that your RF frequencies are tens of MHz ? In that pdf link 
I notice it was 14 MHz.

Do you use an amplifier to increase the signal level from the antenna ?

Out of interest, what is the signal level before and after the Tayloe 
Mixer ?

Matt

On 14/11/21 3:09 pm, Ron Patton via People wrote:
> 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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