[AudioI] SDR : software defined radio and frequency generation

[Ron Patton]

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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