Tuner-Transceiver Interface (ATTI) for the IntelliTune MFJ-993 (TM) and Yaesu (TM)
FT-817, FT-857 and FT-897
From the top:
This Autoamtic Tuner-Transceiver Interface (ATTI), based on my own firmware and a PIC16F876 processor, is used to control a connected transceiver when the "Tune" button is pressed on an IntelliTune MFJ-993 tuner. The ATTI is developed to transmit CAT data commands and responses to and from transceivers models like Yaesu FT-817, FT-857 and FT-897. Developement for Kenwood an Icom transceivers could come later.
The ATTI does the following functions:
The ATTI has two connectors at the rear. One of the connectors connects the ATTI to the IntelliTune MFJ-993 and the other connector connects the ATTI to the connected transceiver. The ATTI is connected to the IntelliTune MFJ-993 via a cable with a 3.5 mm. jack connector at one end and a DB6 connector at the other end. The jack connector is connected to the "Radio Interface" connector at the rear of the IntelliTune MFJ-993 tuner and the DB9 connector is connected to the "MFJ-993" connector at the rear of the ATTI. The ATTI is connected to the transceiver via a cable with a special CAT connector (depends on model) at one end and a DB9 connector at the other end. The CAT connector is connected to the CAT connector at the rear of the transceiver and the DB9 connector is connected to the "Transceiver" connector at the rear of the ATTI.
It is expected that antenna(s), antenna cable, IntelliTune MFJ-993 tuner and used transceiver is connected correct before anything else is done! It is expected that the IntelliTune MFJ-993 tuner is connected to power as described in the tuners manual too.
Turn OFF the power to the IntelliTune MFJ-993 tuner and the transceiver that should be connected to the ATTI. Connect the cables at described in the above section "How to connect".
Turn ON the power to the IntelliTune MFJ-993 tuner and then turn ON the power to the connected transceiver. The ATTI is now ready for use.
Set the connected transceiver to the operating frequency. Push the "Tune" button at the IntelliTune MFJ-993 tuner. If the yellow LED at the ATTI lights up and the connected transceiver begin to transmit in FM mode, when the IntelliTune MFJ-993 tuner is tuning, the ATTI works great. If the IntelliTune MFJ-993 tuner gives an alarm I would refer to the tuners manual. If the ATTI's red LED lights up and an alarm sounds - two things could be wrong: 1) The transceiver is operating at a frequency outside the IntelliTune MFJ-933 tuners frequency range or 2) the transceiver is transmitting with to much power. If 1) then change the frequency to 30MHz or bellow. If 2) then change the output power to a value below approximately 16W.
Project schematic, PCB layout and firmware
The firmware programming part of the ATTI-projekt
The boxing part of the ATTI-project
The rear of the ATTI
The inputs/outputs to/from the ATTI
The finished ATTI-projeckt at the top of my InelliTune MFJ-993 tuner
Just another picture of the ATTI at the top of my IntelliTune MFJ-993 tuner