TX inhibit question
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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 ----- eMail ist virenfrei. Von AVG überprüft - www.avg.de Version: 10.0.1392 / Virendatenbank: 1520/3885 - Ausgabedatum: 08.09.2011 ______________________________________________________________ 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 |
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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: [hidden email] [mailto:elecraft- > [hidden email]] On Behalf Of DK5EW > Sent: Friday, September 09, 2011 8:22 AM > To: [hidden email] > 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 > > > > > > ----- > eMail ist virenfrei. > Von AVG überprüft - www.avg.de > Version: 10.0.1392 / Virendatenbank: 1520/3885 - Ausgabedatum: > 08.09.2011 > ______________________________________________________________ > 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 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 |
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> 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: [hidden email] [mailto:elecraft- >> [hidden email]] On Behalf Of DK5EW >> Sent: Friday, September 09, 2011 8:22 AM >> To: [hidden email] >> 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 >> >> >> >> >> >> ----- >> eMail ist virenfrei. >> Von AVG überprüft - www.avg.de >> Version: 10.0.1392 / Virendatenbank: 1520/3885 - Ausgabedatum: >> 08.09.2011 >> ______________________________________________________________ >> 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 > ______________________________________________________________ > 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 > 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 |
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TNX for the max. 5V information.
I can manage that. best regards Erwin/DK5EW MMMonVHF - Beacon manager Meteorscatter contest manager http://www.MMMonVHF.de - The leading VHF - DX Portal News - Reviews - QSL Informations - Database - Propagation We do spread weekly VHF-DX-Newsletter www.mmmonvhf.de/nletter/newsletter.php 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: [hidden email] [mailto:elecraft- >>> [hidden email]] On Behalf Of DK5EW >>> Sent: Friday, September 09, 2011 8:22 AM >>> To: [hidden email] >>> 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 >>> >>> >>> >>> >>> >>> ----- >>> eMail ist virenfrei. >>> Von AVG überprüft - www.avg.de >>> Version: 10.0.1392 / Virendatenbank: 1520/3885 - Ausgabedatum: >>> 08.09.2011 >>> ______________________________________________________________ >>> 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 >> ______________________________________________________________ >> 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 >> > ______________________________________________________________ > 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 > > > ----- eMail ist virenfrei. Von AVG überprüft - www.avg.de Version: 10.0.1392 / Virendatenbank: 1520/3886 - Ausgabedatum: 09.09.2011 ______________________________________________________________ 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 |
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