SDRs with transmission capability have become cheaper as well, but are still more expensive.

In comparison to competitor devices from DisplayLink, which resemble a classic graphics card with USB 2.03.0 interface, Fresco Logic took a different approach for their USB to VGA adapter, which theyve also patented.

Instead of having the framebuffer for the VGA DAC in the device itself, they use the memory of the host computer and continuously stream the display content via USB.

This makes such adapters very cheap, as it essentialy reduces the adapter to a single chip without requiring framebuffer memory.

The main drawback is that if the host CPU or USB bus is busy or congested, this results in dropouts and flickering of the screen.

This work resulted in osmo-fl2k, which so far was used to transmit low-power FM, DAB, DVB-T, GSM, UMTS and GPS signals.

Typically they are branded as USB 3.0 to VGA adapters, and are advertised with a maximum resolution of 1920 1080 for USB 3.0 and 800 600 for USB 2.0.

Sometimes also 1920 1200 is advertised as maximum resolution (this mode only works with few xHCI controllers and enabled RLE compression).

Also note that devices sold with USB type C connector contain a different chipset (e.g.

Realtek RTD2166) and are just DisplayPort to VGA converters.

The devices are available in various sizes, sometimes also with additional DVI or HDMI support.

All the FL2000-based USB 3.0 HDMI adapters seem to have the 1.2V regulator populated, so its probably used for more than the DAC reference voltage.

You can then run fl2ktest again with a sample rate lower than what was determined as maximum to see if it works stable and to determine your clock error.

On April 22nd, 2018, Steve Markgraf publicly released osmo-fl2k at OsmoDevCon.

Do not operate a radio transmitter unless you are clear of the legal and regulatory requirements.

In most jurisdictions the operation of homebrew DYI transmitters requires at the very least an amateur radio license.

This is what is creatively (ab)used if you use osmo-fl2k to generate a signal much higher than what you could normally achieve with a 165MHz DAC without upconversion.

However, this means that the frequency spectrum will contain not only the one desired harmonic, but all the lower harmonics as well as the base frequency.

You have the following alternatives to broadcasting over the air.

Fresco Logic Usb Vga Display Driver