[Elecraft] K3 LONG delay in TX after TXINH removed (solved)

[Don Wilhelm]

Mark,

It is good to hear that the resistor solved the problem.

If you had to add a pull-down resistor, that is not a K3 problem, that 
is a requirement of whatever in your sequencer that is driving the K3 TX 
INH line.  In other words, whatever is driving your TX INH line is not 
going to zero volts quickly enough.
Since you have several units diode ORed for TX INH, it could be any one 
of them causing the situation.

It is nice to hear that you have found a solution.

73,
Don W3FPR

On 1/26/2013 5:37 PM, Mark n2qt wrote:
> My TxInh circuit diode or'd various inputs together. What I did not do 
> is put a
> resistor to ground after the diodes.  The K3 TxInh input does not have 
> a pull
> down, and has a high enough impedance that there is an appreciable time
> delay before the TxInh coasts down to where it allows the K3 to transmit.
>
> Adding the resistor makes everything ok again...
>