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| CAT cable |
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| USB to TTL Serial Converter |
The above photo shows the cable for the FT1000D which uses a 6 pin DIN connector. Another similar cable was made up using an 8 pin mini DIN connector for the FT857D. Now I can also operate WSPR with frequency hopping using my FT1000D and Ft857D!
USB to serial converter Transceiver CAT connector
FT1000(D) FT857D
RXD 2 4
TXD 3 5
Gnd 1 2
If it does not work for the FT1000D install a pull down resistor of 1K5 between pin 2 and ground (pin 1). Yaesu radios including the FT-990, FT-1000D with TTL CAT ports use an
emitter follower with a high impedance as driver on the serial out line. With the USB to TTL CP2102 converter, the emitter follower does not provide enough load to pull the input of the
buffer/converter low (< 0.5 volt) in the off state. Yaesu added a 1K5 resistor from pin 2 to
ground in later production of the FT-990, FT-1000D and other radios using a similar circuit. This interface should work on the the FT990 as well.
buffer/converter low (< 0.5 volt) in the off state. Yaesu added a 1K5 resistor from pin 2 to
ground in later production of the FT-990, FT-1000D and other radios using a similar circuit. This interface should work on the the FT990 as well.
The USB to TTL CP2102 serial converters are available on eBay or from:
http://www.ebay.com/itm/SY-Hot-Selling-USB-2-0-to-TTL-UART-6PIN-Module-Serial-Converter-CP2102-STC-PRGMR-/271424128315?
Install relevant drivers for the OS you are using from:
https://www.silabs.com/products/mcu/Pages/USBtoUARTBridgeVCPDrivers.aspx
More to come ....
A very useful article, I went through the grief about 15 years ago with my FT990 and FT1000D using a RS232 to CAT cable, I too found that a 1.5k resistor did the trick, today I received a USB to CAT cable and went through the same grief. Same answer, I was not aware of the differences with later production rigs, both of mine have later firmware but need the pulldown resistor. Easier to put it in the cable than in the rig!
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