[RTTY] Help for FT-1000-MP Mark V

[Kok Chen]

On Mar 30, 2015, at 9:04 PM, John L Merrill wrote:

> Someone might correct me but FSK on this radio is actually keyed AFSK like
> it was in the FT1000 and FT990. 

Starting with the FT-1000MP, the 1000-series performed FSK using the DDS chip.  They are true FSK transmitters (with all the honest and goodness, dirty FSK sidebands :-). 

You are correct about the FT1000/D and FT-990.  Those generated AFSK by using a pseudo 3-bit D/A converter (a register with resistor weights) with the clock frequency keyed by the FSK keying line ("keyed AFSK"), so at least they are phase continuous.

With the FT-1000MP, "RTTY" selects FSK, while "PKT" selects AFSK.

73
Chen, W7AY