> According to the Microham manual this output is provided to be
> connected to Yaesu, TenTec and Elecraft transceivers; I was tempted
> to plug it directly into my K3, but I decided to measure the voltage
> on the Station Master's Inhibit out connector: it's 13V.
Measure the current on the SM Inhibit jack. Early units sourced +12V
across a 2K2 pull-down to inhibit in order to work with some early
Yaesu rigs. Later units have changed the output to a 4K7 pull-up
resistor to +12V and an NPN transistor that pulls the +12V to ground
to transmit. If you see more than 3 mA on the Inhibit line, you have
an early unit.
The K3 Inhibit input is a 220 Ohm resistor to a port on the controller.
The later versions of Station Master should be fine with it (3 mA max
current) but if you have an early Station Master, I'd use a voltage
divider or a series resistor and shunt 5.1V zener diode between the
Station Master and K3.
> Question 2: I assume Station Master's Inhibit is active when this
> signal goes to 0V, so K3's TX INH configuration shall be LO=INH.
> Anyone has experience ?
Just like Yaesu, SM Inhibit provides +12V to inhibit and pulls the
Inhibit line low to enable transmit (/Inhibit).
> Question 3: Station Master is controlling a SteppIR antenna: does
> Inhibit activate during the antenna tuning procedures ?
PA PTT is inhibited during antenna tuning. Low power is still possible
as is the case with SteppIR's own tuning relay.
73,
... Joe, W4TV
On 8/20/2015 7:23 AM, Marco HB9CAT wrote:
Hello,
I'm optimizing the shack setup and taking a more careful look at hot
switching; Antenna switching is managed through a couple of Microham
Station Masters, which provide an Inhibit Output as cinch connector.
So Inhibit will be set during any Antenna transtition to protect the
switches, the PA etc.
According to the Microham manual this output is provided to be
connected to Yaesu, TenTec and Elecraft transceivers; I was tempted
to plug it directly into my K3, but I decided to measure the voltage
on the Station Master's Inhibit out connector: it's 13V.
Question 1: Is that voltage OK to be connected to the Inhibit pin in
the K3's ACC connector ? I prefer to ask before doing it.
Question 2: I assume Station Master's Inhibit is active when this
signal goes to 0V, so K3's TX INH configuration shall be LO=INH.
Anyone has experience ?
Question 3: Station Master is controlling a SteppIR antenna: does
Inhibit activate during the antenna tuning procedures ?
Thanks
Marco, HB9CAT
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