[Elecraft] K3 + Station Master?

[Vic K2VCO]

Björn Mohr wrote:
> Has anyone connected the K3 together with a microHAM Station Master? I
> am having problems making TX Inhibit work the way it is supposed to.
> The K3 and SM are connected together with the cable supplied by
> microHAM and when I set TX INH to "HI = Inh" the TX icon starts
> flashing as an indication that the inhibit signal is high. From then
> on, there is not possible to key the radio at all.

If you set TX INH = HI then if the TX INH line is floating, it will be 
activated and you won't be able to transmit. It needs to be low to allow 
transmission.

I am using TX INH with a normally-closed relay in an external SWR meter 
to kill transmit on high SWR (to protect an amplifier). I am using a 
pull-up resistor so the TX INH line rises to +5V when the relay opens. 
When the relay is closed, it's grounded of course.

The floating condition is really not normal -- it should be grounded or 
high for reliable operation.
-- 
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco