Modifications for the Yaesu FT-211

9600 BPS with Yaesu FT-211RH


The FT-211RH has been shown to be suitable for 9600 baud packet operation. There is no major surgery required just two screened leads are required, one for TX AF the other for RX AF connected as follows:

RX AUDIO

On the RX IF Unit (sub board F2869104) connect the screened lead inner to the TK10420 IC pin 9 with the outerscreen to pin 15. Caution should be taken to solder these if soldered to the underside of the board.

TX AUDIO

On the rear of the main PCB a small potentiometer will be seen (peak deviation adjuster). Unsolder the leg nearest to the rear of the set, and connect the inner of the screened TX leads to this point, the outer to the earth plane adjacent to this point. To ensure that the 9600 baud modem is terminated in the required impedance, it is essential that a suitable terminating resistor be placed across the screened lead inner/outer, eg a 560 ohm resister; this may usefully be done at the FT-211RH potentiometer connection.

No further adjustments need to be made to the radio. On the tested modem a suitable level of 2.5 kHz deviation was achieved with one third rotation clockwise of the modem TX AF level potentiometer.


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