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:[email protected]] On Behalf Of Joe
Subich, W4TV
Sent: giovedì, 20. agosto 2015 22:14
To: [email protected]
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
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