[AudioI] SDR : software defined radio and frequency generation

[Ron Patton]

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.

>
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