[Elecraft] K3 - MicroKeyer 2 - mmtty transmit issues on RTTY using FSK-D mode

[Don Wilhelm]

  Jim,

I do not have enough information for a good answer, but I can ask a 
question --
What are the voltage levels you are applying to the ACC pin 1?  It must 
be 0 volts and +5 volts - there is a pullup resistor in the K3, so you 
only need an open collector transistor to accomplish the keying from an 
RS-232 signal.
The TTL voltage must be referenced to ground (ACC pin 5 or pin 12).

What do you mean by "bypassing the MicroKeyer 2" - what is driving the 
ACC connector pin 1 (and K3 ground).
I am not familiar enough with the Microkeyer 2 to understand its 
connection options.

If you are applying raw RS-232 levels to ACC pin 1, you may have damaged 
the TTL input and/or the pullup resistor.

The K3 Utility uses an entirely different path to create RTTY (or PSK31) 
from ASCII input through the RS-232 connector, so there is not a 1 to 1 
correlation between the K3 Utility method and the FSK input to the ACC 
connector.

73,
Don W3FPR

On 10/24/2010 7:57 PM, Jim Spears wrote:
> I am trying to get my K3 operational on rtty and have run aground.  Receive
> works fine.  Transmit using FSK-D mode in the K3 keys the transmitter but
> the FSK signal does not trigger the K3 to transmit both tones.  I hear a
> single tone in the monitor and the P3 also shows the same thing.
>
>
>
> Using the K3 utility to send rtty works fine but this is a different
> interface, bypassing the MicroKeyer 2.
>
>
>
> So the big question is "what am I doing wrong?"   I have posted this to the
> MicroHam Yahoo group, it will be interesting to see where the best advice
> comes from.
>
>
>
> Details of the hardware and software configuration are available on request.
>
>