All, FYI I've got a response from Microham as well, expanding Joe's response:
- direct INH connection to K3: OK if Station Master has at least Hardware revision 4 - SM grounds Inhibit output when everything is OK - SM is pretty conservative and will set Inhibit for any non-normal condition, like antenna switching, SteppIR tuning, band locks, PA locks. Interesting enough these include events "inherited" by other Microham devices through the iLink connection. In my case a for example MK2R+ setting a "same band lock". Thanks for all replies, topic closed Marco HB9CAT -----Original Message----- From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Joe Subich, W4TV Sent: sabato, 22. agosto 2015 01:37 To: Elecraft Reflector Subject: Re: [Elecraft] Microham Station Master Inhibit -> K3 ? > 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) No, High is the at rest state - Inhibit line is pulled low *after* PTT - the time delay is set in the PTT & Sequencer settings. > 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 PTT and PA PTT in MK2R+ are coupled to PTT in SM via iLINK. SM KEYOUT (on PA Port) and MK2R+ PA PTT are the same (logical) signal. PA PTT and KEYOUT are inhibited (blocked) if SteppIR is tuning independent of any use of the inhibit output. Since Icom and Kenwood transceivers do not support inhibit, the amplifier must be disabled when tuning. 73, ... Joe, W4TV On 8/21/2015 5:43 PM, Marco HB9CAT wrote: > 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 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
