Knut,
That is the way it *should* be, and was that way in the K3 originally.
But many (most) ham devices do not do it that way, they expect the
pullup resistors will be provided by the driver gear.
So, because of that, Elecraft added pullup resistors to the band data
outputs of the K3 long ago.
So yes, we are left with a situation that often requires steering diodes.
73,
Don W3FPR
On 2/27/2018 3:48 PM, ab2tc wrote:
Hi Don and all,
Hear,hear, Don. The receivers should have the pullup resistor to whatever
the appropriate voltage needed (within reason) *and* a steering diode in
series with the input. This will prevent another device with a higher
voltage from feeding current back into the device which could damage
semiconductors. Without the steering diode all receivers must use the same
pullup voltage. Of course a single receiver is not a problem either.
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