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Microham Station Master Inhibit -> K3 ?

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Marco HB9CAT

Microham Station Master Inhibit -> K3 ?

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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ae4pb

Re: Microham Station Master Inhibit -> K3 ?

Refer to the owners manual for the TX inhibit signal page 19.
The pin 7 can be configured for TX on OR TX inhibit. I'd suggest using two
resistors as a voltage divider so the pin voltage is never above 5VDC per
the manual.

-----Original Message-----
From: Elecraft [mailto:[hidden email]] On Behalf Of Marco
HB9CAT
Sent: Thursday, August 20, 2015 7:24 AM
To: "Reflector"
Subject: [Elecraft] Microham Station Master Inhibit -> K3 ?

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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Edward R Cole

Re: Microham Station Master Inhibit -> K3 ?

In reply to this post by Marco HB9CAT

Marco,

I use a LM7805 voltage regulator to provide inhibit voltage to my K3
(accessory pin-7). Since I use a sequencer it defeats the inhibit
voltage to enable transmit by grounding the voltage regulator thru a
1K current limiting resistor. But the simple voltage divider concept
looks fine and may operate faster if you use QSK.

You stated that Station Master provided +13v when inhibit is
active. If so the proper setting in the K3 menu should be INH =
HI. You are telling the K3 what level it should see when inhibited.

I cannot offer any advice for the SteppIR; I'm using a 30-year old
Hygain TH3mk4.

73, Ed - KL7UW

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

73, Ed - KL7UW
http://www.kl7uw.com
"Kits made by KL7UW"
Dubus Mag business:
[hidden email]

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Joe Subich, W4TV-4

Re: Microham Station Master Inhibit -> K3 ?

In reply to this post by Marco HB9CAT

> 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:[hidden email]
>
> This list hosted by: http://www.qsl.net Please help support this
> email list: http://www.qsl.net/donate.html Message delivered to
> [hidden email]
>

Marco HB9CAT

Re: Microham Station Master Inhibit -> K3 ?

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 wouldnt TX

Are we both the only ones using Station Masters with Elecraft ? Curious to
gather experiences

Marco HB9CAT

-----Original Message-----
From: Elecraft [mailto:[hidden email]] On Behalf Of Joe
Subich, W4TV
Sent: giovedì, 20. agosto 2015 22:14
To: [hidden email]
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:[hidden email]
>
> This list hosted by: http://www.qsl.net Please help support this email
> list: http://www.qsl.net/donate.html Message delivered to
> [hidden email]
>

______________________________________________________________
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Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

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Please help support this email list: http://www.qsl.net/donate.html Message
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Joe Subich, W4TV-4

Re: 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:[hidden email]] On Behalf Of Joe
> Subich, W4TV
> Sent: giovedì, 20. agosto 2015 22:14
> To: [hidden email]
> 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:[hidden email]
>>
>> This list hosted by: http://www.qsl.net Please help support this email
>> list: http://www.qsl.net/donate.html Message delivered to
>> [hidden email]
>>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html Message
> delivered to [hidden email]
>
>

Marco HB9CAT

Re: Microham Station Master Inhibit -> K3 ?

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:[hidden email]] 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:[hidden email]] On Behalf Of
> Joe Subich, W4TV
> Sent: giovedì, 20. agosto 2015 22:14
> To: [hidden email]
> 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:[hidden email]
>>
>> This list hosted by: http://www.qsl.net Please help support this
>> email
>> list: http://www.qsl.net/donate.html Message delivered to
>> [hidden email]
>>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net Please help support this email
> list: http://www.qsl.net/donate.html Message delivered to
> [hidden email]
>
>

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