Shared Projects by rfreire

Project: https://github.com/rfrht/FT991A-PAT

This project is a remix of OE2DOR’s perfect and neatly crafted FT-991A Panadapter board.

The final objective is to actually embed a RTL-SDR inside a FT-991 (or FT-991A), without drilling holes, external cables, connectors or whatsoever: The FT-991A sports a USB hub (which feeds the sound card and the CAT interface). By replacing the existing 2-port USB hub chip with a 4-port variant (same SMD footprint and compatible pinout), the SDR will be installed in the radio, and it will be exposed to the computer via the existing USB port, conveniently routed through the radio’s USB hub. So, plug the radio’s USB port and the computer will see three devices: the virtual sound card, the CAT port and the SDR.

This fork adds on-board latch control, by using a AND gate with two inputs that controls a RF switch: The IF signal is only connected to the SDR if both signals (on my project, a SDR GPIO signal and the RX9 signal from radio’s Main Unit) are present. Otherwise, the SDR is left isolated to the ground and no signal is tapped.

Project: https://github.com/rfrht/FT991A-PAT

This project is a remix of OE2DOR’s perfect and neatly crafted FT-991A Panadapter board.

The final objective is to actually embed a RTL-SDR inside a FT-991 (or FT-991A), without drilling holes, external cables, connectors or whatsoever: The FT-991A sports a USB hub (which feeds the sound card and the CAT interface). By replacing the existing 2-port USB hub chip with a 4-port variant (same SMD footprint and compatible pinout), the SDR will be installed in the radio, and it will be exposed to the computer via the existing USB port, conveniently routed through the radio’s USB hub. So, plug the radio’s USB port and the computer will see three devices: the virtual sound card, the CAT port and the SDR.

This fork adds on-board latch control, by using a AND gate with two inputs that controls a RF switch: The IF signal is only connected to the SDR if both signals (on my project, a SDR GPIO signal and the RX9 signal from radio’s Main Unit) are present. Otherwise, the SDR is left isolated to the ground and no signal is tapped.