On Sun, Nov 3, 2019 at 7:33 PM Dennis Wage dwage@dwage.com wrote:
I am trying to make a home brew cable for chirp for the Yeasu ft2900.
I have an old prolific uv5r that's already been cut in half. Inside are a red, white and black wire.
If any one knows what the red, black and white wires in a prolific uv59 cable are for email me off list please.
The 2900 only needs data and ground, and I know which pins of the rj12 they go to.
Dennis M. Wage (W9BOQ)
Hi Dennis,
You probably won't need any of the existing wire. On many programming cables the USB end has a cover that can be easily separated and removed. That will give you access to 4 outputs of the USB UART.
5V TxD RxD Gnd
From there you will have to build an small bit of circuitry that
combines the 4 down to the 2 required for the radio.
RX/TX Gnd
After googling I see a circuit uses for (4) 2N7000 transistors and (4) 4.7k resistors to do the job. There may be others.
https://forums.qrz.com/index.php?threads/diy-make-your-own-programming-cable...
Good luck with the project and tell us how it works out.
Jim KC9HI