[Elecraft] RTTY Operations

[Rich Lentz]

> The most desirable way to generate rtty is
> by FSK.
> It should be possible to FSK the bfo of the K2.
> It would require a fimware change to give Rx/Tx
> tone shift similar to CW but with a tone greater
> than the 800Hz available at present. Perhaps
> the whole thing could be done in firmware.

As a retired Navy Electronics Technician (Chief), and responsible for the proper operation, alignment, and calibration of military FSK equipment I will attest that it is not a simple matter to convert a rig to transmit FSK CLEANLY.  The tone must switch at the zero crossing point or it will introduce more harmonics than you can measure. Using a sound card is a little forgiving in that those outside the SC and rigs audio pass band won't be transmitted.  BUT, if you convert a rig to transmit these two signals, then the only filter left is the RF filter, which on the K2 is as wide as the band plus some. 

Rich
KE0X