Re: [Elecraft] Key Out jack

2017-10-14 Thread Clay Autery
K3 Schematics: http://www.elecraft.com/manual/K3_Schematics_Jun_2010.pdf K3S Schematics: http://www.elecraft.com/manual/E740323%20K3s%20Schematic%20Files.pdf __ Clay Autery, KY5G MONTAC Enterprises (318) 518-1389 On 10/13/2017 8:33 AM, N4ZR wrote: I am trying to use the

Re: [Elecraft] Key Out jack

2017-10-13 Thread Jim Rhodes
There is however an adjustable delay. Default 8 ms, which can be adjusted with TX DLY in the CONFIG menu. On Fri, Oct 13, 2017 at 5:21 PM, Don Wilhelm wrote: > Skip, > > Yes, it does follow the keying when in QSK. If it did not, the KPA500 > would not follow the K3(s)

Re: [Elecraft] Key Out jack

2017-10-13 Thread Don Wilhelm
Skip, Yes, it does follow the keying when in QSK. If it did not, the KPA500 would not follow the K3(s) in QSK mode (the KPA500 connection uses the KEYOUT-LP from the ACC connector). The T/R switching is all electronic and can be quite fast. If the amplifier uses relay switching, the relay

Re: [Elecraft] Key Out jack

2017-10-13 Thread Fred Jensen
Related question:  Does KEY OUT essentially follow the TX state?  IAW, if PTT or VOX is asserted, it also asserts?  If so, I guess that means that it follows the keying when in QSK?  It's a real PITA to get to the back of my K3 right now or I'd check it myself. 73, Fred ["Skip"] K6DGW Sparks

Re: [Elecraft] Key Out jack

2017-10-13 Thread Don Wilhelm
Pete, As mentioned by others, the K3(S) KEYOUT jack does not produce any voltage - the voltage must be produced by another source (sufficient to power the relay). One method to check the K3 KEYOUT is to use your Ohmmeter. stick the red probe into the center of the jack and the other probe

Re: [Elecraft] Key Out Jack

2017-10-13 Thread K9MA
I hadn't thought of that but, yes, the relay does need an external 12V supply.  There absolutely must be a diode across the relay coil to prevent the voltage spike at turn-off from exceeding the 200 V limit and shorting the FET.  For the 40 mA relay, a 3.3K resistor could be used in series

Re: [Elecraft] key out jack...

2017-10-13 Thread Roy Koeppe
Here's what Pete originally stated: "...the jack appears to be shorted all the time...(etc.)" Think he has it right, but he's using a digital meter -- tricky. 73, Roy K6XK __ Elecraft mailing list Home:

Re: [Elecraft] Key Out Jack

2017-10-13 Thread Bob McGraw K4TAX
I suggest the Fred Cady book.   He has all the info shown in charts and tables and explains how things work and how things should be configured.   I view it is too much work to try to figure out via a schematic what is done and needed. 73 Bob, K4TAX On 10/13/2017 11:17 AM, James Wilson

[Elecraft] Key Out Jack

2017-10-13 Thread James Wilson
Pete, Also, the schematics for the K3 can be downloaded from the Elecraft website. Jim - W4RKS __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post:

[Elecraft] Key Out Jack

2017-10-13 Thread James Wilson
Pete, I think you have misunderstood the purpose of the Key Out jack on the K3. It does not provide 12 volts out at 40 ma. It is a keying circuit that can withstand a external keying circuit up to +200 volts DC and can handle a keying load of up to 5 amps. (See the K3 manual regarding the Rear

[Elecraft] Key Out jack

2017-10-13 Thread N4ZR
I am trying to use the Key Out jack on my K3 to key a small relay to protect my SDR from RF.  The 12V@40 ma is well within the stated rating of the jack, but to my surprise it does not work.  Measuring with an analog multimeter, the jack appears to be shorted all the time, and also to have a