[Elecraft] K3 - Transverters

[Roger de Valle]

Hi to All.

I have a K3 with several transverters attached, two of which are 
Elecraft 144 and 432 models, the others are generic. I have used this 
configuration for over 12 months and in this period had not upgraded the 
firmware in the K3 (it weren't broke). Early this week I did upgrade and 
found the K3 would not turn on or respond until I removed the connection 
between the K3 and the Elecraft transverters.

I have since discovered that if there is no power to the transverters 
the K3 will not turn on, if there is power then all acts normally, it 
seems to be an issue with I2C type bus between the K3 and the 
transverters. It's no big deal, I just have to ensure there is power on 
the transverters all of the time.

My questions are (In the hope some Elecraft engineers or other clever 
folk read this)

1: Is this unique to my configuration?
2: Was the firmware change by design or as a consequence of supporting 
other devices on the bus?

Regards.

Roger VK3ADE.