Thanks a lot for your reply Joe, my Station Masters are pretty new (2014/2015) so I shall be safe to connect Inhibit directly.
> Just like Yaesu, SM Inhibit provides +12V to inhibit and pulls the Inhibit line low to enable transmit (/Inhibit). Then why do I measure 12V in "rest state", when no switching occurs ? Isn't it the other way around ? (I can't test it right now) > PA PTT is inhibited during antenna tuning. Low power is still possible as is the case with SteppIR's own tuning relay. PA PTT is currently given by an MK2R+ so SM PTT doesn't apply; but if SM would set INH during tuning the K3 wouldn’t TX Are we both the only ones using Station Masters with Elecraft ? Curious to gather experiences Marco HB9CAT -----Original Message----- From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Joe Subich, W4TV Sent: giovedì, 20. agosto 2015 22:14 To: elecraft@mailman.qth.net Subject: Re: [Elecraft] Microham Station Master Inhibit -> K3 ? > 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 > > ______________________________________________________________ > Elecraft mailing list Home: > http://mailman.qth.net/mailman/listinfo/elecraft Help: > http://mailman.qth.net/mmfaq.htm Post: > mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net Please help support this email > list: http://www.qsl.net/donate.html Message delivered to > li...@subich.com > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to hb9...@thezollingers.org ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
