TNX for the max. 5V information.
I can manage that.
best regards
Erwin/DK5EW
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Am 09.09.2011 20:46, schrieb Joe Subich, W4TV:
>> Pin 7 is connected to the front panel microcontroller with a series
>> 220 ohm resistor. The microcontroller on the front panel is a 5
>> volt part so I wouldn't apply any voltages greater than 5 volts (or
>> the maximum logic high voltage.)
> The alternative would be to install a 4.7K - 10K resistor between the
> external 13.8V inhibit source and the K3 inhibit output (as N0SS did
> in the Quadra/K3 cable). The resistor would limit the current into
> the microcontroller to a safe level in all cases. Another option is
> to install a 5.1V zener diode across the inhibit input (or output of
> the sequencer with the appropriate current limiting resistor) to keep
> the voltage on the K3 "inhibit input" from exceeding 5V.
>
> 73,
>
> ... Joe, W4TV
>
>
> On 9/9/2011 10:48 AM, Cady, Fred wrote:
>> Hello Erwin,
>> Pin 7 is connected to the front panel microcontroller with a series 220 ohm
>> resistor. The microcontroller on the front panel is a 5 volt part so I
>> wouldn't apply any voltages greater than 5 volts (or the maximum logic high
>> voltage.)
>>
>> 73,
>> Fred
>> KE7X
>>
>> Fred Cady
>> fcady at ieee dot org
>> "The Elecraft K3: Design, Configuration and Operation"
>> www.ke7x.com
>>
>> (Lulu has 20% discount for the K3 book until midnight 9/9 - SEPTEMBER305 -
>> and 15% through 9/30 - AWESOME305. See www.ke7x.com.)
>>
>>
>>> -----Original Message-----
>>> From: elecraft-boun...@mailman.qth.net [mailto:elecraft-
>>> boun...@mailman.qth.net] On Behalf Of DK5EW
>>> Sent: Friday, September 09, 2011 8:22 AM
>>> To: Elecraft@mailman.qth.net
>>> Subject: [Elecraft] TX inhibit question
>>>
>>> Hi all,
>>> since 05.September I'm proud owner of a K3 # 5776.
>>> Now I work trough the manual from side 1 to end to understand function.
>>>
>>> As I use a sequencer to protect my LNA's I will use also the RX inhibit
>>> function.
>>> The sequencer will provides 13VDC in RX mode to the ACC connector at
>>> pin 7.
>>> I understand I have to set CONFIG: TX INH to high. But can I use 13VDC
>>> to that pin 7 or better
>>> what's the maximum voltage can be there at pin 7?
>>>
>>> --
>>> best regards
>>> Erwin/DK5EW
>>>
>>>
>>>
>>>
>>>
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