I was thinking perhaps an RF sampling ADC, however that it likely to require a large number of CPU cycles to downsample.

Hi Matt,

I'm not sure what you are referring to.  Are you asking if RF is directly sampled by an audio card? I don't have a clue how that would work.

73,
Ron / W4MMP

On 11/15/2021 05:20, Matt Flax wrote:

On 15/11/21 2:35 pm, Ron Patton wrote:

Hi Matt,

73,
Ron / W4MMP

On 11/14/2021 17:20, Matt Flax wrote:

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

Yes, the RF is the MHz range starting at 1.8MHz and ending at 30MHz (In Amateur radio terms,  HF (High Frequency)). 

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

Our products do amplify the received RF via the antenna.  There a number of products (not ours) that do not. 

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

The received signal is in the uV (micro volt) range.  A mid range voltage is ~50uv.  I don't recall what the voltage is after the RF amplifier which fed to the Tayloe mixer.  Nor do I recall what the output voltage of the mixer is.  I need to look at the design specs for that part of the circuit.

Its ok, no need to do that I was dreaming of impractical things when I asked those questions.

I just had a look at the Tayloe Mixer implementation, that is an impressively elegant way to implement an IQ stage.

Do people use ultra high sample rates to implement SDR ? Where more of the processing is shifted to software ?

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