[RTTY] Looking for an interface - a few simple requirements

[Kok Chen]

I had earlier written to Peter that although the MicroHam interfaces cannot achieve precise 45.45 baud transmission, that the hardware cannot be the cause of any of the "slow RTTY" that we hear -- simply because I have never heard "slow RTTY" come from my uH Router program.  If it were a hardware problem, I will have problems too.

I would challenge any "golden ears" to tell the difference between 45.45 baud and 45.0 baud (and you can actually get closer to 45.45 than 45.0 with a MicroKeyer if you program the division ratio correctly -- presumably all software is doing that already).  Heck, the majority of RTTY ops cannot tell the difference between 1 stop bit and 2 stop bits and the character rate difference is much larger there.  Due to because of the extra keying sidebands it is actually easier to tell 1.5 stop bit from 1 stop bit.

The most likely cause of the "slow RTTY" are Elecraft K3, running in FSK-D and keyed by using a Morse paddle (yes, the Amateur community spans a range of intelligence :-).

MicroKeyers have been in existence for a long time and no one noticed "slow RTTY" until Elecraft implemented FSK-D wrongly (by not immediately issuing a diddle while the op is in the middle of paddling in a long Morse character like a zero or a 9).

73
Chen, W7AY