K3 Schematics: http://www.elecraft.com/manual/K3_Schematics_Jun_2010.pdf
K3S Schematics:
http://www.elecraft.com/manual/E740323%20K3s%20Schematic%20Files.pdf
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Clay Autery, KY5G
MONTAC Enterprises
(318) 518-1389
On 10/13/2017 8:33 AM, N4ZR wrote:
I am trying to use the
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)
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
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
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
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
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
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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
Pete, Also, the schematics for the K3 can be downloaded from the Elecraft
website.
Jim - W4RKS
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Post:
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
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
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