Re: [Elecraft] K3 - KEY OUT problem

[M. George]

Bob N7WY motivated me to provide a few more details on the KEY OUT
mosfet/Q3/IRFI630 replacement.  I took the bottom off my K3 to show the
location of the IRFI630 on the bottom of the PCB.  It was a little more
tricky than I remembered, so you will need to access the main PCB from the
top of the K3 by removing the KIO3 board and the IO board that has the IF
output.  I did the replacement without removing the back panel which would
have been very painful.  Again, I do remember being able to do this without
a major disassembly.  I de-soldered from the bottom of the PCB and pulled
and replaced the IRFI630 from the top.  It was tight, but it sure beat
sending the K3 back to Elecraft and you can do a clean job if you are
careful.

Here are some new pictures that I just took

and annotated with more details of the location of Q3 along with a snippet
from the Elecraft Schematic where Q3 is located.  Your mileage may vary
based on your re-work skills but I wouldn't consider this a difficult
replacement... medium effort at worst.  When in doubt, send your radio in,
but it's not rocket science:

Updated Pictures:
http://www.nc7j.com/pa/main.php?cmd=album&var1=NG7M%2FRadios%2FK3%2FSmokedKeyOutIRFI630G%2F

Good Luck!

Max NG7M

On Sat, Dec 28, 2019 at 10:20 AM M. George 
wrote:

> Pete, just saw your question on the PTT OUT not working for you.  I had an
> issue with this back in 2016... I can't remember what I did, but it wasn't
> smart and it was my fault... Anyway, I let the smoke/metal out of the IRFI630G
> that is used on the PPT out.  It's beefy and can take a lot of abuse, but I
> still managed to destroy it.  Anyway, it's an easy replacement and saved me
> from shipping my K3 back to Elecraft.  Total operator error in my
> situation... maybe attached 12v to the PTT out?  Again, I can't remember.
>
> Here is a picture of what my damaged MOSFET looked like at the time... see
> the crack and leakage ;)
>
>
> http://www.nc7j.com/pa/main.php?cmd=imageview&var1=NG7M%2FRadios%2FK3%2FSmokedKeyOutIRFI630G%2FIRFI630GFried.JPG
>
> And here is the Mouser part I ordered to replace it:
>
>
> https://www.mouser.com/ProductDetail/Vishay-Siliconix/IRFI630GPBF?qs=%2Fha2pyFaduhSYcFgYMU8ma88%2Fb96%2Fl4SGKWFSYSWEuEDdoRAAyNpCg==
>
> Here is the schematic link:
> https://ftp.elecraft.com/K3/Manuals%20Downloads/K3_Schematics_Jun_2010.pdf
>
> Search for IRFI630 in the PDF, you will find it straight away... and I
> don't remember it being tough to expose the damaged mosfet and replace
> it...
>
> Max NG7M
>
> On Sat, Dec 28, 2019 at 8:57 AM N4ZR  wrote:
>
>> Thanks to everyone who responded.  I've now written to Elecraft Support,
>> and anticipate that it will have to go back to the mother ship.
>>
>> --
>>
>> 73, Pete N4ZR
>> Check out the Reverse Beacon Network
>> at , now
>> spotting RTTY activity worldwide.
>> For spots, please use your favorite
>> "retail" DX cluster.
>>
>> __
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>
>
>
> --
> M. George
>


-- 
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Re: [Elecraft] K3 - KEY OUT problem

[donovanf]

Pete, 


I've never had any reason to look at the KEY OUT circuit before, but 
it uses a very robust IRF1630 power MOSFET, rated at 200 volts 
and 10 amps. Very robust indeed, its no wonder I've never had a 
failure. Its not a surface mount device, its a TO220 package. 


73 
Frank 
W3LPL 

- Original Message -

From: donov...@starpower.net 
To: elecraft@mailman.qth.net 
Sent: Saturday, December 28, 2019 4:43:05 PM 
Subject: Re: [Elecraft] K3 - KEY OUT problem 

Hi Pete, 


Perhaps more important: how did this unusual failure occur? 
Unless you can figure this out with a reasonable degree of certainty, 
you're radio is likely to make multiple trips for repair. 


One possibility is that you connected a relay to the KEY OUT 
connector, but the relay didn't have a snubber diode across its coil. 
That could cause enough of a spike to damage your radio. 


Another possibility is that you plugged the incorrect cable into the 
K3 and excess voltage on that cable damaged your radio. 


Good luck! 


73 
Frank 
W3LPL 

- Original Message - 

From: "N4ZR"  
To: "Elecraft List"  
Sent: Saturday, December 28, 2019 3:57:01 PM 
Subject: [Elecraft] K3 - KEY OUT problem 

Thanks to everyone who responded. I've now written to Elecraft Support, 
and anticipate that it will have to go back to the mother ship. 

-- 

73, Pete N4ZR 
Check out the Reverse Beacon Network 
at <http://reversebeacon.net>, now 
spotting RTTY activity worldwide. 
For spots, please use your favorite 
"retail" DX cluster. 

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Re: [Elecraft] K3 - KEY OUT problem

[donovanf]

Hi Pete, 


Perhaps more important: how did this unusual failure occur? 
Unless you can figure this out with a reasonable degree of certainty, 
you're radio is likely to make multiple trips for repair. 


One possibility is that you connected a relay to the KEY OUT 
connector, but the relay didn't have a snubber diode across its coil. 
That could cause enough of a spike to damage your radio. 


Another possibility is that you plugged the incorrect cable into the 
K3 and excess voltage on that cable damaged your radio. 


Good luck! 


73 
Frank 
W3LPL 

- Original Message -

From: "N4ZR"  
To: "Elecraft List"  
Sent: Saturday, December 28, 2019 3:57:01 PM 
Subject: [Elecraft] K3 - KEY OUT problem 

Thanks to everyone who responded. I've now written to Elecraft Support, 
and anticipate that it will have to go back to the mother ship. 

-- 

73, Pete N4ZR 
Check out the Reverse Beacon Network 
at <http://reversebeacon.net>, now 
spotting RTTY activity worldwide. 
For spots, please use your favorite 
"retail" DX cluster. 

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[Elecraft] K3 - KEY OUT problem

[N4ZR]

Thanks to everyone who responded.  I've now written to Elecraft Support, 
and anticipate that it will have to go back to the mother ship.


--

73, Pete N4ZR
Check out the Reverse Beacon Network
at , now
spotting RTTY activity worldwide.
For spots, please use your favorite
"retail" DX cluster.

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Re: [Elecraft] K3 Key Out Jack Not Working

[Don Wilhelm]

Pete,

Check the Keyout jack with your ohmmeter.  One lead to the center 
conductor and the other to the shell.
During receive, it should read infinite resistance, and when you go to 
transmit, the resistance should go to near zero.


Do you have anything else connected to the KEYOUT jack (an amplifier 
perhaps)?  If so, you will have to use isolating diodes for the amp and 
your relay for the antenna.


73,
Don W3FPR

On 12/27/2019 6:12 PM, N4ZR wrote:
I'm trying to set things up so that I can disconnect my 160M transmit 
antenna whenever I'm receiving, to prevent noise coupling into my RX 
antenna.  My thought is to use the Key Out jack on the K3 to control DC 
to a relay at the base of the antenna,  floating the base of the 
inverted L unless PTT is asserted.  The lashup is complete, and works 
when I short the phono plug manually, but not when I plug it into the 
KEY OUT jack and energize PTT.


I'm hoping it's just a menu issue, but my manual doesn't show any menu 
options affecting the Key Out Jack.  I have a KPA-1500, and Low Power 
Key Out via the ACConnector works fine for controlling the amplifier, so 
I assume the basic functionality is OK.  Any advice?  I'd really love to 
get it going for the Stew tomorrow!

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[Elecraft] K3 Key Out Jack Not Working

[N4ZR]

I'm trying to set things up so that I can disconnect my 160M transmit 
antenna whenever I'm receiving, to prevent noise coupling into my RX 
antenna.  My thought is to use the Key Out jack on the K3 to control DC 
to a relay at the base of the antenna,  floating the base of the 
inverted L unless PTT is asserted.  The lashup is complete, and works 
when I short the phono plug manually, but not when I plug it into the 
KEY OUT jack and energize PTT.


I'm hoping it's just a menu issue, but my manual doesn't show any menu 
options affecting the Key Out Jack.  I have a KPA-1500, and Low Power 
Key Out via the ACConnector works fine for controlling the amplifier, so 
I assume the basic functionality is OK.  Any advice?  I'd really love to 
get it going for the Stew tomorrow!


--

73, Pete N4ZR
Check out the Reverse Beacon Network
at , now
spotting RTTY activity worldwide.
For spots, please use your favorite
"retail" DX cluster.

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Re: [Elecraft] K3 KEY OUT, hi or low on TX?

[Don Wilhelm]

Jamie,

It will short the active wire to ground.

The KeyOut does not source any voltage, it is like a switch, it is 
either open or closed.  Any voltage is sourced by the amplifier or other 
external device.  It will only work with a positive voltage.


The voltage and current listed in the specifications are the greatest 
that the FET can handle.


73,
Don W3FPR

On 1/4/2019 3:45 PM, Jamie WW3S wrote:

Does the KEY OUT jack go HI or LO during transmit?

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Re: [Elecraft] K3 KEY OUT, hi or low on TX?

[donovanf]

Hi Jamie, 


Neither... 


KEY OUT is connected to an IRF630 power MOSFET which has 
"on/off" states, not "HI/LO" states. 


During receive its in the off state, sinking less than 50 microamps 
from the load connected to KEY OUT. 


During transmit its capable of sinking ("grounding") up to 200 volts 
at up to 5 amps continuous from the load connected to KEY OUT. 


73 
Frank 
W3LPL 





- Original Message -

From: "Jamie WW3S"  
To: elecraft@mailman.qth.net 
Sent: Friday, January 4, 2019 8:45:22 PM 
Subject: [Elecraft] K3 KEY OUT, hi or low on TX? 

Does the KEY OUT jack go HI or LO during transmit? 
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[Elecraft] K3 KEY OUT, hi or low on TX?

[Jamie WW3S]

Does the KEY OUT jack go HI or LO during transmit? 
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Re: [Elecraft] k3 key out jack

[Don Wilhelm]

Shel,

Keyout is on RF Board sheet 1.
Is your problem only from the internal keyer?  In other words, does it 
work when you use a hand key or computer keying?


If also a problem from a hand key or computer keying, then what is the 
DC voltage at the gate of Q3 during keydown - should be almost 12 volts.

Do you have 7 volts on the gate of Q5 during receive?

The Keyout is a simple circuit consisting only of Q3 and Q5 - when in 
transmit, the 7R input should go to near zero, and that should make the 
gate of Q3 go to a high voltage (almost 12 volts) - that is all there is 
to it.


73,
Don W3FPR



On 3/8/2018 4:42 PM, Shel Sherman wrote:



Sent from Mail for Windows 10
My K3 does not pull the key out line to ground when pulsed by the internal 
keyer, I need some help in tracing the circuit on a schematic.

Shel Sherman  WO0C
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[Elecraft] k3 key out jack

[Shel Sherman]

Sent from Mail for Windows 10
My K3 does not pull the key out line to ground when pulsed by the internal 
keyer, I need some help in tracing the circuit on a schematic.

Shel Sherman  WO0C
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Re: [Elecraft] (k3) Key out redux

[Don Wilhelm]

Pete,

Connect one side of the relay coil to your +12 volt supply, and connect 
the other side to the KEYOUT jack.  Put a diode with the cathode 
connected to the +12 volt side across the relay coil.  The negative of 
your power supply has to connect to the shell of the KEYOUT connector.
The relay will be activated when the K3 KEYOUT is active - keying, TUNE 
and PTT will all activate it.


Yes, you should be able to use the same +12 volt supply to power the 
SDR's preamp and active antenna, but that is a different consideration 
than activating the relay.


73,
Don W3FPR

On 10/14/2017 10:18 AM, N4ZR wrote:
Thanks, everyone who responded to my earlier query - I now understand 
that the circuit in the K3 is equivalent to the old bipolar transistor 
switches we used to use for serial port CW/PTT keying.


So here's my problem - I have a small 12V DPDT relay that I want to use 
to switch the power to my SDR's preamp and active antenna - in other 
words, to cut them off when my K3 is in transmit.  What I can't figure 
out (be patient with a history major, please!) is how to use the Key Out 
jack to switch the power to the relay , while using the same 12V supply 
to power both the relay and the preamp/active antenna combo.



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Re: [Elecraft] (k3) Key out redux

[David Shoaf]

Here's  a link to the  basic discussion
  .  See the wiring
diagram about half way through the article.

Cheers,

David



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[Elecraft] (k3) Key out redux

[N4ZR]

Thanks, everyone who responded to my earlier query - I now understand 
that the circuit in the K3 is equivalent to the old bipolar transistor 
switches we used to use for serial port CW/PTT keying.


So here's my problem - I have a small 12V DPDT relay that I want to use 
to switch the power to my SDR's preamp and active antenna - in other 
words, to cut them off when my K3 is in transmit.  What I can't figure 
out (be patient with a history major, please!) is how to use the Key Out 
jack to switch the power to the relay , while using the same 12V supply 
to power both the relay and the preamp/active antenna combo.


Ideally, the 12V relay would only be on when the K3's PTT was on.  The 
thing that's driving me nuts is that I had this working, once before, 
and then tore it apart for not very good reasons. Now I can't replicate 
what I had.


Would anyone be willing to go offline and help me figure this out?

--

73, Pete N4ZR
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Re: [Elecraft] K3 Key Out Problem

[Don Wilhelm]

Gerry,

What are you using to measure the KEYOUT line?  In CW, it will follow 
the QSK keying. so it will be a series of fast pulses.  If you are 
trying to measure with an ohmmeter (or voltmeter), it may not respond 
fast enough to see it on the meter.
The fact that it works when you key the microphone indicates that it is 
working.


Whether your RX antenna is fast enough to follow the K3 keying is quite 
another matter - if it uses a relay, it may not be fast enough.


There are K3 menu parameters that will change the Delay time, see the TX 
DLY menu listing for details.


73,
Don W3FPR

On 9/6/2016 11:05 AM, Gerry Villhauer wrote:

I have had my K3 for a couple years now. Had a Flex 5000 prior. Love the K3 but 
discovered a problem.  I recently got a receiving loop antenna an connected the 
keyoutput from the K3 to shut the power off to the loop when transmitting.  On 
SSB in works fine when the mic is keyed. When operating CW it does not give an 
output to shutdown the power. Any help appreciated.
Gerry, W0GV



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[Elecraft] K3 Key Out Problem

[Gerry Villhauer]

I have had my K3 for a couple years now. Had a Flex 5000 prior. Love the K3 but 
discovered a problem.  I recently got a receiving loop antenna an connected the 
keyoutput from the K3 to shut the power off to the loop when transmitting.  On 
SSB in works fine when the mic is keyed. When operating CW it does not give an 
output to shutdown the power. Any help appreciated.
Gerry, W0GV

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Re: [Elecraft] K3 Key out timing?

[Jim Miller]

Actually since I'm using the KPA500 then need relationship would between
KPA500 and the K3 Keyout.

Thanks

Jim ab3cv

On Sun, Dec 20, 2015 at 9:24 PM, Jim Miller  wrote:

> I know that K3 Key out to RF delay is adjustable up to 20mS on initiation.
>
> What is the tail end timing relationship between Key out and RF emission?
>
> 73
>
> jim ab3cv
>
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[Elecraft] K3 Key out timing?

[Jim Miller]

I know that K3 Key out to RF delay is adjustable up to 20mS on initiation.

What is the tail end timing relationship between Key out and RF emission?

73

jim ab3cv
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[Elecraft] K3 Key Out Issue

[Paul Ormandy ZL4PW]

Hi all,

Am hoping someone can help me with a problem. I have a K3 with a KD9SV rx antenna switch and use the 
Key Out line to toggle this device.


For some reason, the K3 will not send the key Out low in CW mode via:

- external software (Logger32, N1MM)
- the macro buttons
- a paddle plugged in the rear port

It won't send it low using any software-oriented mode, e.g. voice keyer or 
MMVARI either.

However, it does send it low when PTT is activated, i.e. by a footswitch, and will do so when the K3 
is in CW mode as well as SSB so in the meantime I can toggle the rx ant switch with the footswitch. 
So it seems the cabling and MOSFET controlling the Key Out lien are functioning correctly.


Have just downloaded the latest firmware, the latest firmware installer and the problem persists. I 
have tried EEINIT prior to reloading the complete firmware, tried loading older configurations etc...


My set-up is K3/KPA500/KAT500 connected via the serial cables for control and keying. I ahve tried 
disconnecting all external equipment save the rx ant switch and used the M1-M4 macros to generate 
code with VOX on and it still won't operate the Key Out line.


Makes no difference if in VOX or QSK off/on or set PTT to OFF-OFF and use the 
paddle or M1-M4 macros.

I have

Cheers,

Paul
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Re: [Elecraft] K3 Key Out

[Wayne Burdick]

Yes.
Wayne
N6KR

On Jun 18, 2011, at 9:53 AM, W4CCS wrote:

> Hi all:
>
> Is the K3 key out (for keying amps) suppose the work in tune..??
>
> W4CCS
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[Elecraft] K3 Key Out

[W4CCS]

Hi all:

Is the K3 key out (for keying amps) suppose the work in tune..??

W4CCS
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Re: [Elecraft] K3 Key Out Inoperative in CW & Tune Modes

[Don Wilhelm]

  Dennis,

Save the configuration and do the EEINIT, then restore the configuration.

At most you might have to enter one menu parameter manually - but only 
if it is wrong in your K3 right now.  If all your menu items are correct 
now, they will restore correctly.

Having to manually change one parameter is far different from having to 
manually restore them all.  Your source seems to have blown things out 
of proportion.

73,
Don W3FPR

On 12/3/2010 7:48 AM, Dennis Ward wrote:
> All:
>
> All of a sudden, my K3 has stopped activating the Key Out while in CW
> or XMIT / Tune mode.
>
> The Key Out does work when closing the PTT input on the Mic Jack.
>
> I received the suggestion to re-init the radio last night.  I'm not
> ready to do that, as I was cautioned that saving a recent
> conifguration may carry the problem with it and could very well cause
> me to reload parameters manually.
>
> I don't have much spare time for this with two toddlers in the house.
>
> Has anyone else experienced this issue, and if so what was the resolution?
>
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[Elecraft] K3 Key Out Inoperative in CW & Tune Modes

[Dennis Ward]

All:

All of a sudden, my K3 has stopped activating the Key Out while in CW
or XMIT / Tune mode.

The Key Out does work when closing the PTT input on the Mic Jack.

I received the suggestion to re-init the radio last night.  I'm not
ready to do that, as I was cautioned that saving a recent
conifguration may carry the problem with it and could very well cause
me to reload parameters manually.

I don't have much spare time for this with two toddlers in the house.

Has anyone else experienced this issue, and if so what was the resolution?

Thank you,

Dennis KT8X
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Re: [Elecraft] K3 key-out jack - configuration needed?

[Guy Olinger K2AV]

Sometimes Tip/Ring/Sleeve plugs give a false detent and the plug was
not all the way in.  Also if a conductor in a cord has broken inside
its insulation, you can get this behavior, including everything
working OK afterwards.  Another issue is the tip of an RCA plus not
being quite long enough, or the molding around it keeping it from
being fully inserted. Also RCA chassis jacks are famous for losing
their connection to chassis if a biting lockwasher was not used.

You may wish to construct a replacement cord set and throw away the
wire you are using now.

73, Guy



On Sun, Oct 10, 2010 at 6:06 PM, Oliver "Olli" Dröse  wrote:
> Hi Don,
>
> many thanks for your advice. Just opened up the K3, located Q3 and Q5 and
> measured there directly. Everything as it should be, 13 V bias to the gates
> during TX, Drain switching to ground, everything as expected. Uh? Same
> measurements at the RCA jack from the PCB and everything fine. Measured again
> from the outside and ... everything fine?! Connecting the cable, PA is
> switching. Closing the cover and putting on the screws and still everything
> fine?! I have no clue why it's working perfectly now and didn't before ...
> *scratching head*
>
> Oh well, maybe my K3 simply wanted somebody to look into it's beautiful inards
> again. ;-))
>
> Andyway, thanks again for your help. Must be magic emails in this case. ;-))
>
> 73, Olli - DH8BQA
>
>
>
> - Original Message -
> From: "Don Wilhelm" 
> To: ""Oliver \"Olli\" Dröse"" 
> Cc: 
> Sent: Sunday, October 10, 2010 6:32 PM
> Subject: Re: [Elecraft] K3 key-out jack - configuration needed?
>
>
>>  Olli,
>>
>> The Key Out and the ACC connector Keyout-LP are developed from the same
>> internal signal, but the driving transistors are different for each.
>> The Key Out jack is driven by Q5 and Q3 on the RF Board, and you will
>> find your problem associated with one of those transistors.  See the
>> schematic for the RF board at the top left of sheet 1.  Check R4 as well
>> - the gate of Q3 should go to a high level during transmit (use TX test).
>>
>> 73,
>> Don W3FPR
>>
>> On 10/10/2010 10:31 AM, Oliver "Olli" Dröse wrote:
>>> Hi guys,
>>>
>>> preparing for the autumn contest season I thought to do some cable work
>>> today.
>>> Made up a cable to key the amplifier and wanted to use the key-out jack
>>> therefor
>>> (only need to sink 13,8 V / 60 mA so should work perfectly well). But the 
>>> amp
>>> isn't keying. So I measured the RCA jack and unkeyed I can measure infinite
>>> resistance as it should be the case but if I ptt the radio no change on the
>>> RCA
>>> jack?! Should be around zero then so no keying there.
>>>
>>> Checked the manual but couldn't find anything related to configuration of
>>> that
>>> jack, seems it should be always working, right? Any ideas why it is not?
>>>
>>> Checked the LP key-out on the ACC connector and that is working properly 
>>> (but
>>> not enough for the amp, ofcourse, only measured there for verification the
>>> radio
>>> is really keying out, hi).
>>>
>>> Can anybody help?
>>>
>>> TIA&  73, Olli - DH8BQA
>>>
>>>
>>>
>>> __
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>>>
>
>
> 
>
>
>
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Re: [Elecraft] K3 key-out jack - configuration needed?

[Olli]

Hi James,

you don't need to connect an outside pull-up (only if you want to measure 
voltages, so you are basically right as well, depending on what/how you want to 
measure ;-)). The transistor is used as a simple electronic switch here thus 
when getting bias on it's gate it will switch source (connected to ground) 
through to the gate (also groundlevel then, that's why you can simply measure 
for 0 ohm resistance between drain and chassis when keyed). If no bias then 
infinite ohms at drain.

Anyway, thanks for your assistance and advices! This is what I love about 
Elecraft and their email reflector. ;-))

73, Olli - DH8BQA



- Original Message - 
From: "JAMES ROGERS" 
To: "Oliver "Olli" Dröse" 
Sent: Sunday, October 10, 2010 6:29 PM
Subject: Re: [Elecraft] K3 key-out jack - configuration needed?


Oliver, it is a MOSFET, IRF630 and you may be right, but I would not
expect to see any change until I provided a voltage source to the Key
Out line. So, if it was me I would do the "pull up" resistor test I
described earlier just to be on the safe side. It appears from the
schematic that it is switched by the 7R line. K3 schematics, RF Board
sheet 1 of 4. There is no drain voltage applied to the IRF630 so that
will have to be supplied externally.


Jim, W4ATK
On Oct 10, 2010, at 11:05 AM, Oliver Olli Dröse wrote:

> Hi James,
>
> well, resistance check should work to my mind at least when keying
> the radio. Unkeyed it is an open collector as I understood (thus
> infinite) and keyed the keying transistor is switching to ground so
> then I should measure 0 ohm (or nearly 0, the low-power key-out port
> hast 446 ohm keyed).
>
> Anyway, ofcourse tried with the amp before and as that was not keyed
> I pulled everything out to do the measurements. The amp itself as
> well as the cable is okay. As soon as I put the cable connected to
> the amp to ground /chassis of K3) everything's switching as
> expected. It is just that the RCA jack has no keying signal. :-((
>
> 73, Olli - DH8BQA
>
>
>
> - Original Message - From: "JAMES ROGERS"
> 
> To: "Oliver Olli Dröse" 
> Sent: Sunday, October 10, 2010 5:28 PM
> Subject: Re: [Elecraft] K3 key-out jack - configuration needed?
>
>
> Oliver,
> Key Out is not a set of dry contacts and thus measuring with a VOM
> for resistance would be a bit problematic. You could use a "pull up"
> resistor (2K or so) from the Key Out line to a power supply, say 12V.
> Put your VOM on an appropriate voltage scale to measure the voltage at
> the junction of the pull up resistor and the Key Out line and the
> voltage to go to near 0 when PTT is activated. Or you could just hook
> up you amp and see if it is keyed when PTT is activated. According to
> the book it will handle up to +200VDC at 5A.
>
> Jim, W4ATK
>
> On Oct 10, 2010, at 9:31 AM, Oliver Olli Dröse wrote:
>
>> Hi guys,
>>
>> preparing for the autumn contest season I thought to do some cable
>> work today.
>> Made up a cable to key the amplifier and wanted to use the key-out
>> jack therefor
>> (only need to sink 13,8 V / 60 mA so should work perfectly well).
>> But the amp
>> isn't keying. So I measured the RCA jack and unkeyed I can measure
>> infinite
>> resistance as it should be the case but if I ptt the radio no change
>> on the RCA
>> jack?! Should be around zero then so no keying there.
>>
>> Checked the manual but couldn't find anything related to
>> configuration of that
>> jack, seems it should be always working, right? Any ideas why it is
>> not?
>>
>> Checked the LP key-out on the ACC connector and that is working
>> properly (but
>> not enough for the amp, ofcourse, only measured there for
>> verification the radio
>> is really keying out, hi).
>>
>> Can anybody help?
>>
>> TIA & 73, Olli - DH8BQA
>>
>>
>>
>> __
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>> Please help support this email list: http://www.qsl.net/donate.html
>
>
>
> 
>
>
>
> Eingehende eMail ist virenfrei.
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> 10/09/10 20:34:00
>







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Re: [Elecraft] K3 key-out jack - configuration needed?

[Olli]

Hi Don,

many thanks for your advice. Just opened up the K3, located Q3 and Q5 and 
measured there directly. Everything as it should be, 13 V bias to the gates 
during TX, Drain switching to ground, everything as expected. Uh? Same 
measurements at the RCA jack from the PCB and everything fine. Measured again 
from the outside and ... everything fine?! Connecting the cable, PA is 
switching. Closing the cover and putting on the screws and still everything 
fine?! I have no clue why it's working perfectly now and didn't before ... 
*scratching head*

Oh well, maybe my K3 simply wanted somebody to look into it's beautiful inards 
again. ;-))

Andyway, thanks again for your help. Must be magic emails in this case. ;-))

73, Olli - DH8BQA



- Original Message - 
From: "Don Wilhelm" 
To: ""Oliver \"Olli\" Dröse"" 
Cc: 
Sent: Sunday, October 10, 2010 6:32 PM
Subject: Re: [Elecraft] K3 key-out jack - configuration needed?


>  Olli,
>
> The Key Out and the ACC connector Keyout-LP are developed from the same
> internal signal, but the driving transistors are different for each.
> The Key Out jack is driven by Q5 and Q3 on the RF Board, and you will
> find your problem associated with one of those transistors.  See the
> schematic for the RF board at the top left of sheet 1.  Check R4 as well
> - the gate of Q3 should go to a high level during transmit (use TX test).
>
> 73,
> Don W3FPR
>
> On 10/10/2010 10:31 AM, Oliver "Olli" Dröse wrote:
>> Hi guys,
>>
>> preparing for the autumn contest season I thought to do some cable work 
>> today.
>> Made up a cable to key the amplifier and wanted to use the key-out jack 
>> therefor
>> (only need to sink 13,8 V / 60 mA so should work perfectly well). But the amp
>> isn't keying. So I measured the RCA jack and unkeyed I can measure infinite
>> resistance as it should be the case but if I ptt the radio no change on the 
>> RCA
>> jack?! Should be around zero then so no keying there.
>>
>> Checked the manual but couldn't find anything related to configuration of 
>> that
>> jack, seems it should be always working, right? Any ideas why it is not?
>>
>> Checked the LP key-out on the ACC connector and that is working properly (but
>> not enough for the amp, ofcourse, only measured there for verification the 
>> radio
>> is really keying out, hi).
>>
>> Can anybody help?
>>
>> TIA&  73, Olli - DH8BQA
>>
>>
>>
>> __
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>>






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Re: [Elecraft] K3 key-out jack - configuration needed?

[Don Wilhelm]

  Olli,

The Key Out and the ACC connector Keyout-LP are developed from the same 
internal signal, but the driving transistors are different for each.
The Key Out jack is driven by Q5 and Q3 on the RF Board, and you will 
find your problem associated with one of those transistors.  See the 
schematic for the RF board at the top left of sheet 1.  Check R4 as well 
- the gate of Q3 should go to a high level during transmit (use TX test).

73,
Don W3FPR

On 10/10/2010 10:31 AM, Oliver "Olli" Dröse wrote:
> Hi guys,
>
> preparing for the autumn contest season I thought to do some cable work today.
> Made up a cable to key the amplifier and wanted to use the key-out jack 
> therefor
> (only need to sink 13,8 V / 60 mA so should work perfectly well). But the amp
> isn't keying. So I measured the RCA jack and unkeyed I can measure infinite
> resistance as it should be the case but if I ptt the radio no change on the 
> RCA
> jack?! Should be around zero then so no keying there.
>
> Checked the manual but couldn't find anything related to configuration of that
> jack, seems it should be always working, right? Any ideas why it is not?
>
> Checked the LP key-out on the ACC connector and that is working properly (but
> not enough for the amp, ofcourse, only measured there for verification the 
> radio
> is really keying out, hi).
>
> Can anybody help?
>
> TIA&  73, Olli - DH8BQA
>
>
>
> __
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[Elecraft] K3 key-out jack - configuration needed?

[Olli]

Hi guys,

preparing for the autumn contest season I thought to do some cable work today. 
Made up a cable to key the amplifier and wanted to use the key-out jack 
therefor 
(only need to sink 13,8 V / 60 mA so should work perfectly well). But the amp 
isn't keying. So I measured the RCA jack and unkeyed I can measure infinite 
resistance as it should be the case but if I ptt the radio no change on the RCA 
jack?! Should be around zero then so no keying there.

Checked the manual but couldn't find anything related to configuration of that 
jack, seems it should be always working, right? Any ideas why it is not?

Checked the LP key-out on the ACC connector and that is working properly (but 
not enough for the amp, ofcourse, only measured there for verification the 
radio 
is really keying out, hi).

Can anybody help?

TIA & 73, Olli - DH8BQA



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Re: [Elecraft] K3 Key Out line

[Brian Machesney]

Phil,

You can see the T-R switching circuitry in the schematics available on the
Elecraft web site. Just search for "t-r" and you'll find the circuitry for
both the 10W and 100W PAs.
-- 
73 -- Brian -- K1LI


On Wed, Dec 23, 2009 at 12:01 PM, Phil Hystad  wrote:

> I noticed from the documentation that the K3 Key out line can handle up to
> 200 VDC and 5 amps.  I assume this means that when the key out is closed
> that it can handle 5 amps of current.
>
> So, I am curious, what kind of switch mechanism is used for TR switching.
>  Is this an actual relay or is it some kind of transistor switch.  I am
> guessing transistor based switch but this is where I started wondering about
> the 200 VDC and 5 amp capability thing.
>
> Or, am I totally off base.  I am willing to be off base without shame
> because I really do not know a lot of details of how these things are
> actually done.
>
> Oh, two more minor decisions on configuration to make and then I order my
> K3, probably just after Christmas sometime.
>
> phil, K7PEH
>
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Re: [Elecraft] K3 Key Out line

[Don Wilhelm]

Phil,

There is no direct relationship between the KEYOUT line and the T/R 
switch in the K3.  The T/R switch is fully electronic, no relays to 
clack and clatter.

The KEYOUT line goes to ground before the onset of RF - and the delay 
can be adjusted in the menu.  It is normally used for keying an 
amplifier.  There is also a Keyout-LP line on the ACC connector that 
operates at the same time, but the current capability is only 10 ma.
Yes, KEYOUT can handle up to 200 volts open circuit voltage and 5 amps 
of closed (keydown) current.

73,
Don W3FPR

Phil Hystad wrote:
> I noticed from the documentation that the K3 Key out line can handle up to 
> 200 VDC and 5 amps.  I assume this means that when the key out is closed that 
> it can handle 5 amps of current.
>
> So, I am curious, what kind of switch mechanism is used for TR switching.  Is 
> this an actual relay or is it some kind of transistor switch.  I am guessing 
> transistor based switch but this is where I started wondering about the 200 
> VDC and 5 amp capability thing.
>
> Or, am I totally off base.  I am willing to be off base without shame because 
> I really do not know a lot of details of how these things are actually done.
>
> Oh, two more minor decisions on configuration to make and then I order my K3, 
> probably just after Christmas sometime.
>
> phil, K7PEH
>   
>
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Re: [Elecraft] K3 Key Out line

[Wayne Burdick]

Hi Phil,

Key out is driven by a very rugged N-channel MOSFET.

73,
Wayne
N6KR

On Dec 23, 2009, at 9:01 AM, Phil Hystad wrote:

> I noticed from the documentation that the K3 Key out line can handle  
> up to 200 VDC and 5 amps.  I assume this means that when the key out  
> is closed that it can handle 5 amps of current.
>
> So, I am curious, what kind of switch mechanism is used for TR  
> switching.  Is this an actual relay or is it some kind of transistor  
> switch.  I am guessing transistor based switch but this is where I  
> started wondering about the 200 VDC and 5 amp capability thing.


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[Elecraft] K3 Key Out line

[Phil Hystad]

I noticed from the documentation that the K3 Key out line can handle up to 200 
VDC and 5 amps.  I assume this means that when the key out is closed that it 
can handle 5 amps of current.

So, I am curious, what kind of switch mechanism is used for TR switching.  Is 
this an actual relay or is it some kind of transistor switch.  I am guessing 
transistor based switch but this is where I started wondering about the 200 VDC 
and 5 amp capability thing.

Or, am I totally off base.  I am willing to be off base without shame because I 
really do not know a lot of details of how these things are actually done.

Oh, two more minor decisions on configuration to make and then I order my K3, 
probably just after Christmas sometime.

phil, K7PEH

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Re: [Elecraft] K3 - Key Out Question

[Don Wilhelm]

Jack,

Unless you have a problem with the K3, the KEYOUT jack should have no 
voltage on it either during TX or RX.
Check the KEYOUT with an ohmmeter.  It should have a high resistance 
during receive - then put the K3 into TEST (hold the MODE  up button), 
then press TUNE - the resistance should drop to almost zero.

With no cable connected to KEYOUT, you should not see any significant 
voltage at the K3 - if you do, double check your DMM connections.  Any 
voltage during key-up (or RX) will be coming from whatever you connect 
to KEYOUT - KEYOUT simply grounds the connection when TX is enabled.

73,
Don W3FPR

Jack Nelson wrote:
> Good evening. I'm attempting to use my K3 with a Tokyo High Power HL-1.2Kfx 
> amp. On the amp, when STBY (which has 12v on it) is grounded, the relay 
> clicks, and the "On Air" led lightsjust like it should. However, when a 
> cable is connected between the K3's Key Out jack, and the STBY on the amp, 
> the amp shuts down with an "Over Drive" warning as soon as the K3 is keyed. 
> The K3's power is passed through the amp to the watt meter and dummy load.
>
> I noticed the Key Out jack on the K3 has 4.75vdc on it whether it's in the 
> Tune position or not. Is this normal. I don't think the amp likes seeing the 
> voltage from the K3.
>
> 73's Jack  K5FSE
> Treas  QRP ARCI
>   
>
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Re: [Elecraft] K3 - Key Out Question

[Iain MacDonnell - N6ML]

On Sun, Dec 20, 2009 at 5:55 PM, Jack Nelson  wrote:
> Good evening. I'm attempting to use my K3 with a Tokyo High Power HL-1.2Kfx
> amp. On the amp, when STBY (which has 12v on it) is grounded, the relay
> clicks, and the "On Air" led lightsjust like it should. However, when a
> cable is connected between the K3's Key Out jack, and the STBY on the amp,
> the amp shuts down with an "Over Drive" warning as soon as the K3 is keyed.
> The K3's power is passed through the amp to the watt meter and dummy load.
>
> I noticed the Key Out jack on the K3 has 4.75vdc on it whether it's in the
> Tune position or not. Is this normal. I don't think the amp likes seeing the
> voltage from the K3.

Are you sure you're not just putting too much RF into that THP? Dial
the "PWR" setting way down on the K3 and try again ...

~Iain / N6ML
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[Elecraft] K3 - Key Out Question

[Jack Nelson]

Good evening. I'm attempting to use my K3 with a Tokyo High Power HL-1.2Kfx 
amp. On the amp, when STBY (which has 12v on it) is grounded, the relay 
clicks, and the "On Air" led lightsjust like it should. However, when a 
cable is connected between the K3's Key Out jack, and the STBY on the amp, 
the amp shuts down with an "Over Drive" warning as soon as the K3 is keyed. 
The K3's power is passed through the amp to the watt meter and dummy load.

I noticed the Key Out jack on the K3 has 4.75vdc on it whether it's in the 
Tune position or not. Is this normal. I don't think the amp likes seeing the 
voltage from the K3.

73's Jack  K5FSE
Treas  QRP ARCI

jack.nel...@mindspring.com



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Re: [Elecraft] [K3] Key out (was CW sideband)

[Jon Kåre Hellan]

Joe Subich, W4TV wrote:

> That's right - it does.  Again, the signal is "Key Out" not 
> "Amplifier PTT."  Key out should ALWAYS follow the straight 
> key (or internal keyer) input regardless of whether the K3 
> is producing power. 

Actually, it follows the logical OR of XMIT button and key.
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Re: [Elecraft] [K3] Key out (was CW sideband)

[Joe Subich, W4TV]

> I guess it must be done this way for people who send the key 
> first to their amp or antenna switch, and then get their PTT 
> back to the radio from it? Like from an extra contact pair on 
> a relay that bypasses a mast-mount preamp. 

It is Key Out - not amplifier PTT.  The difference is subtle but 
simple.  However, if you don't want your amplifier keyed, put 
the amp in standby. 

> Also, I'm away from my K3 now but I could swear that it works 
> at full QSK even if you don't have QSK enabled.

That's right - it does.  Again, the signal is "Key Out" not 
"Amplifier PTT."  Key out should ALWAYS follow the straight 
key (or internal keyer) input regardless of whether the K3 
is producing power. 
  


> -Original Message-
> From: elecraft-boun...@mailman.qth.net 
> [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Carl Clawson
> Sent: Thursday, April 23, 2009 1:36 PM
> To: Elecraft@mailman.qth.net
> Subject: Re: [Elecraft] [K3] Key out (was CW sideband)
> 
> 
> > ps: the first thing that drives me crazy about the K3?
> > The fact that the radio (and the amp) key when I'm playing
> > with my paddles and just wanna hear my own CW. 
> 
> Me too.
> 
> I guess it must be done this way for people who send the key 
> first to their amp or antenna switch, and then get their PTT 
> back to the radio from it? Like from an extra contact pair on 
> a relay that bypasses a mast-mount preamp. People hate smoking those.
> 
> I also would like to be able to turn it off, so that Key Out 
> occurs only when VOX or PTT is already asserted. Yet another 
> menu option for the bottom of the software wish list!
> 
> Also, I'm away from my K3 now but I could swear that it works 
> at full QSK even if you don't have QSK enabled. That's pretty odd.
> 
> 73 and thanks for listening,
> Carl WS7L
> K3 #486, 1 year old and owner is still smiling.
> 
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Re: [Elecraft] [K3] Key out (was CW sideband)

[David Gilbert]

That isn't the problem.  Even if you have VOX off, hitting the paddles 
activates the T/R relay line to the amplifier.  It does so even if you 
put the K3 into TEST mode.  There's no power output, but the amp relay 
(and anything else that may be activated by PTT) engages.

73,
Dave   AB7E


Brian Machesney wrote:
> If you don't want power output when you hit the key, turn off the VOX while
> in CW mode - the rig responds with "PTT" in the message area. To get power
> out with VOX off, you must press the XMIT button or active the PTT (with a
> footswitch, for example) while keying the paddles.
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Re: [Elecraft] [K3] Key out (was CW sideband)

[Brian Machesney]

If you don't want power output when you hit the key, turn off the VOX while
in CW mode - the rig responds with "PTT" in the message area. To get power
out with VOX off, you must press the XMIT button or active the PTT (with a
footswitch, for example) while keying the paddles.

Depending on what you mean, this is also the answer to the "full QSK"
statement. VOX "on" means that pressing the key activates the transmitter.
QSK on means the RX is active between code elements. Here is the "truth
table" for VOX and QSK:

VOX QSK
Off (message = PTT) Off (message = SEMI)  XMIT button or PTT to
transmit
Off   On (message = FULL)  Same as Off - Off
On (message = VOX)Off  Key = transmit;
no RX between elements
On   On  Key =
transmit; RX between elements

73 -- Brian -- K1LI
K1 270 -- K2 2070 -- K3 2465

On Thu, Apr 23, 2009 at 1:35 PM, Carl Clawson wrote:

> > ps: the first thing that drives me crazy about the K3?
> > The fact that the radio (and the amp) key when I'm playing
> > with my paddles and just wanna hear my own CW.
>
> Me too.
>
> I guess it must be done this way for people who send the key first to
> their amp or antenna switch, and then get their PTT back to the radio
> from it? Like from an extra contact pair on a relay that bypasses a
> mast-mount preamp. People hate smoking those.
>
> I also would like to be able to turn it off, so that Key Out occurs
> only when VOX or PTT is already asserted. Yet another menu option for
> the bottom of the software wish list!
>
> Also, I'm away from my K3 now but I could swear that it works at full
> QSK even if you don't have QSK enabled. That's pretty odd.
>
> 73 and thanks for listening,
> Carl WS7L
> K3 #486, 1 year old and owner is still smiling.
>
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Re: [Elecraft] [K3] Key out (was CW sideband)

[Carl Clawson]

> ps: the first thing that drives me crazy about the K3?
> The fact that the radio (and the amp) key when I'm playing 
> with my paddles and just wanna hear my own CW. 

Me too.

I guess it must be done this way for people who send the key first to
their amp or antenna switch, and then get their PTT back to the radio
from it? Like from an extra contact pair on a relay that bypasses a
mast-mount preamp. People hate smoking those.

I also would like to be able to turn it off, so that Key Out occurs
only when VOX or PTT is already asserted. Yet another menu option for
the bottom of the software wish list!

Also, I'm away from my K3 now but I could swear that it works at full
QSK even if you don't have QSK enabled. That's pretty odd.

73 and thanks for listening,
Carl WS7L
K3 #486, 1 year old and owner is still smiling.

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Re: [Elecraft] K3 Key out

[Eric Swartz - WA6HHQ, Elecraft]

Hi Phil,

If the 30L-1 keying input, with its very high negative voltage, was ever 
hooked directly to the K3's keying output, there is a very good chance 
you may have destroyed the K3s output keying device.


Eric  WA6HHQ


Phil LaMarche wrote:

I've had many wonderful emails with suggestions and I thank you.
 
Let me be more specific:  The Amp Keyer works OK.  The 30L-1 keys OK.  
The tested cable coming out of the Key Out on the back of the K3 isn't 
working properly.  It's in the closed position.  If I take the other 
end of the cable from the Key Out and plug into the amp keyer, it keys 
it without my keying the K3.  If I hook it direct to the 30L-1 it keys 
the amp.  I'm presuming the circuit is faulty in the K3?  Ideas?
 
Phil
 


Philip LaMarche
LaMarche Enterprises, Inc.
_www.instantgourmetspices.com_ 

www.w9dvm.com 
800-395-7795 pin 02
727-944-3226
FAX 727-937-8834
NASFT 30210

K3  #1605
W9DVM

 



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Re: [Elecraft] K3 Key out

[Don Wilhelm]

Phil,

What is the possibility that you damaged the K3 KEYOUT by connecting the 
negative voltage to it?

Check with an ohmmeter connected across the KEYOUT jack on the K3 - put 
the K3 in TX TEST just to be safe.  If it reads close to zero ohms with 
no respect for keyup or keydown (or PTT or TUNE), then the driving 
HEXFET has been damaged.  OTOH, if the resistance is high during keyup 
periods, then there must be some fault with your cable or its connectors.

73,
Don W3FPR

Phil LaMarche wrote:
> I've had many wonderful emails with suggestions and I thank you.
>  
> Let me be more specific:  The Amp Keyer works OK.  The 30L-1 keys OK.  
> The tested cable coming out of the Key Out on the back of the K3 isn't 
> working properly.  It's in the closed position.  If I take the other 
> end of the cable from the Key Out and plug into the amp keyer, it keys 
> it without my keying the K3.  If I hook it direct to the 30L-1 it keys 
> the amp.  I'm presuming the circuit is faulty in the K3?  Ideas?
>  
> Phil
>
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Re: [Elecraft] K3 Key out

[W0MU Mike Fatchett]

He has a relay.

The key out is grounded at all times.  Sounds like a component failure of
some type.

 


"A slip of the foot you may soon recover, but a slip of the tongue you may
never get over." Ben Franklin
-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Iain MacDonnell -
N6ML
Sent: Sunday, February 08, 2009 4:09 PM
To: Phil LaMarche
Cc: elecraft@mailman.qth.net; den...@lutronx.com
Subject: Re: [Elecraft] K3 Key out


Phil,

I had the same issue when I hooked up an SB200. Because the keying voltage
in the amp is negative, you can't connect to the K3 directly. I put in an
intermediate relay, which works OK. I might install the Harbach "soft-key"
mod at some point...

Have you put a continuity tester across "KEY OUT"? So long as you connect
the positive side to the center, it should only read closed when the K3 is
transmitting.

 ~Iain



Phil LaMarche wrote:
> I've had many wonderful emails with suggestions and I thank you.
>  
> Let me be more specific:  The Amp Keyer works OK.  The 30L-1 keys OK.  
> The tested cable coming out of the Key Out on the back of the K3 isn't 
> working properly.  It's in the closed position.  If I take the other 
> end of the cable from the Key Out and plug into the amp keyer, it keys 
> it without my keying the K3.  If I hook it direct to the 30L-1 it keys 
> the amp.  I'm presuming the circuit is faulty in the K3?  Ideas?
>  
> Phil
>  
> 
> Philip LaMarche
> LaMarche Enterprises, Inc.
>  <http://www.instantgourmetspices.com/> www.instantgourmetspices.com
> 
> www.w9dvm.com <http://www.w9dvm.com/>
> 800-395-7795 pin 02
> 727-944-3226
> FAX 727-937-8834
> NASFT 30210
> 
> K3  #1605
> W9DVM
> 
> 
>  
> 
> 
> 
> --
> --
> 
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Re: [Elecraft] K3 Key out

[Iain MacDonnell - N6ML]

Phil,

I had the same issue when I hooked up an SB200. Because the keying
voltage in the amp is negative, you can't connect to the K3 directly. I
put in an intermediate relay, which works OK. I might install the
Harbach "soft-key" mod at some point...

Have you put a continuity tester across "KEY OUT"? So long as you
connect the positive side to the center, it should only read closed
when the K3 is transmitting.

 ~Iain



Phil LaMarche wrote:
> I've had many wonderful emails with suggestions and I thank you.
>  
> Let me be more specific:  The Amp Keyer works OK.  The 30L-1 keys OK.  The
> tested cable coming out of the Key Out on the back of the K3 isn't working
> properly.  It's in the closed position.  If I take the other end of the
> cable from the Key Out and plug into the amp keyer, it keys it without my
> keying the K3.  If I hook it direct to the 30L-1 it keys the amp.  I'm
> presuming the circuit is faulty in the K3?  Ideas?
>  
> Phil
>  
> 
> Philip LaMarche 
> LaMarche Enterprises, Inc.
>   www.instantgourmetspices.com
> 
> www.w9dvm.com   
> 800-395-7795 pin 02 
> 727-944-3226 
> FAX 727-937-8834 
> NASFT 30210 
> 
> K3  #1605
> W9DVM 
> 
> 
>  
> 
> 
> 
> 
> 
> __
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[Elecraft] K3 Key out

[Phil LaMarche]

I've had many wonderful emails with suggestions and I thank you.
 
Let me be more specific:  The Amp Keyer works OK.  The 30L-1 keys OK.  The
tested cable coming out of the Key Out on the back of the K3 isn't working
properly.  It's in the closed position.  If I take the other end of the
cable from the Key Out and plug into the amp keyer, it keys it without my
keying the K3.  If I hook it direct to the 30L-1 it keys the amp.  I'm
presuming the circuit is faulty in the K3?  Ideas?
 
Phil
 

Philip LaMarche 
LaMarche Enterprises, Inc.
  www.instantgourmetspices.com

www.w9dvm.com   
800-395-7795 pin 02 
727-944-3226 
FAX 727-937-8834 
NASFT 30210 

K3  #1605
W9DVM 


 
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Re: [Elecraft] [K3] KEY OUT

[WILLIS COOKE]

Monty, I am afraid that I can't help you at the moment, but I also recently 
acquired a "new to me" ALS-600.  I have not had time to try mine just yet 
because I have been repairing antennas after Hurricane Ike, but I will get to 
it shortly.  I hope that you find an answer elsewhere before I get that far, 
but at least we can compare notes when I do.

Willis 'Cookie' Cooke 
K5EWJ


--- On Sun, 12/7/08, Monty Shultes <[EMAIL PROTECTED]> wrote:

> From: Monty Shultes <[EMAIL PROTECTED]>
> Subject: [Elecraft] [K3] KEY OUT
> To: elecraft@mailman.qth.net
> Date: Sunday, December 7, 2008, 7:41 AM
> I have a problem but can't determine if it's between
> the ears or in the radio.
> 
> I can not get KEY OUT to key my amp when using VOX.  It
> keys only when PTT or XMIT is pushed.  The amp is new to me,
> an ALS-600. I have searched the archives and believe this
> should work.
> 
> Help please.
> 
> Monty  K2DLJ___
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[Elecraft] [K3] KEY OUT

[Monty Shultes]

I have a problem but can't determine if it's between the ears or in the radio.

I can not get KEY OUT to key my amp when using VOX.  It keys only when PTT or 
XMIT is pushed.  The amp is new to me, an ALS-600. I have searched the archives 
and believe this should work.

Help please.

Monty  K2DLJ___
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[Elecraft] K3 Key Out

[Don Rasmussen]

The main benefit would be to other transceivers you
may have, like my OMNI VI+, now I don't need to think
which of my rigs are okay for the amp. It's great to
know the K3 device is diode protected - K3 - what
else? !!!


>>>The Elecraft K3 uses an IRF1630 HEXFET Power
MOSFET, rated for 200V with an ON Resistance of .4 Ohm
in a TO-220 Package. Don't see much of a gain by using
the external device.....




[Elecraft] K3 Key Out
Dave Zeph zephd at indy.rr.com 
Mon Sep 1 18:49:09 EDT 2008 

Previous message: [Elecraft] K3 Key Out 
Next message: [Elecraft] [K3] 3rd order distortion 
Messages sorted by: [ date ] [ thread ] [ subject ] [
author ] 



The Keying Transistor used in the Harbach Soft Key
uses an IRF610 HEXFET
Power MOSFET, rated for 200V with an ON Resistance of
1.5 Ohm in a TO-220
Package.

The Elecraft K3 uses an IRF1630 HEXFET Power MOSFET,
rated for 200V with an
ON Resistance of .4 Ohm in a TO-220 Package.

Don't see much of a gain by using the external device
.



73 ---> Dave, W9ZRX




> -Original Message-
> From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-
> bounces at mailman.qth.net] On Behalf Of Don
Rasmussen
> Sent: Monday, 01 September, 2008 18:20
> To: elecraft at mailman.qth.net
> Subject: [Elecraft] K3 Key Out
> 
> I soldered up the soft key mod today, it's
inexpensive
> and simple to install.


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RE: [Elecraft] K3 Key Out

[Dave Zeph]

The Keying Transistor used in the Harbach Soft Key uses an IRF610 HEXFET
Power MOSFET, rated for 200V with an ON Resistance of 1.5 Ohm in a TO-220
Package.

The Elecraft K3 uses an IRF1630 HEXFET Power MOSFET, rated for 200V with an
ON Resistance of .4 Ohm in a TO-220 Package.

Don't see much of a gain by using the external device .



73 ---> Dave, W9ZRX




> -Original Message-
> From: [EMAIL PROTECTED] [mailto:elecraft-
> [EMAIL PROTECTED] On Behalf Of Don Rasmussen
> Sent: Monday, 01 September, 2008 18:20
> To: elecraft@mailman.qth.net
> Subject: [Elecraft] K3 Key Out
> 
> I soldered up the soft key mod today, it's inexpensive
> and simple to install.
> 
> http://www.harbachelectronics.com/_mgxftp/pdffiles/SK220PICTORIAL.PDF
> 
> [Elecraft] K3 Key Out
> David Robertson darjar at comcast.net
> Mon Sep 1 17:40:33 EDT 2008
> 
> The K3 Key out may be rated for 200 volts but if you
> use it with an unmodified SB220 you are taking a real
> chance of damaging the K3 because there is no
> protection diode in the SB220 and the field collapse
> voltage can exceed 1000 volts.
> 
> 
> the SB220 was originally designed for relay keying.
> 
> 73
> Dave KD1NA
> 
> 
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Re: [Elecraft] K3 Key Out

[Tom Hammond]

The MOSFET used in the K3 is internally diode protected.

73,

Tom   N0SS

At 16:40 09/01/2008, David Robertson wrote:

Hank

The K3 Key out may be rated for 200 volts but if you use it with an 
unmodified SB220 you are taking a real chance of damaging the K3 
because there is no protection diode in the SB220 and the field 
collapse voltage can exceed 1000 volts.



the SB220 was originally designed for relay keying.

73
Dave KD1NA
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[Elecraft] K3 Key Out

[Don Rasmussen]

I soldered up the soft key mod today, it's inexpensive
and simple to install.

http://www.harbachelectronics.com/_mgxftp/pdffiles/SK220PICTORIAL.PDF

[Elecraft] K3 Key Out
David Robertson darjar at comcast.net 
Mon Sep 1 17:40:33 EDT 2008 

The K3 Key out may be rated for 200 volts but if you
use it with an unmodified SB220 you are taking a real
chance of damaging the K3 because there is no
protection diode in the SB220 and the field collapse
voltage can exceed 1000 volts.


the SB220 was originally designed for relay keying.

73
Dave KD1NA


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[Elecraft] K3 Key Out

[David Robertson]

Hank

The K3 Key out may be rated for 200 volts but if you use it with an unmodified 
SB220 you are taking a real chance of damaging the K3 because there is no 
protection diode in the SB220 and the field collapse voltage can exceed 1000 
volts.


the SB220 was originally designed for relay keying.

73
Dave KD1NA
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Re: [Elecraft] K3 Key Out

[Eric Swartz - WA6HHQ, Elecraft]

Solid state.
73,

Eric  WA6HHQ
_..._
-Original Message-
From: W6SX Hank Garretson <[EMAIL PROTECTED]>
Date: Sunday, Aug 31, 2008 8:52 am
Subject: [Elecraft] K3 Key Out
To: 


>The K3's Key Out is rated for +200V at 5 Amps.

Inside the K3, is Key Out a relay or solid state?


73,

Hank, W6SX

Mammoth Lakes, California

Elevation 8083 feet in John Muir's Range of Light 


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Re: [Elecraft] K3 Key Out

[Vic K2VCO]

W6SX Hank Garretson wrote:



The K3's Key Out is rated for +200V at 5 Amps.


Inside the K3, is Key Out a relay or solid state?


It's an IRFI630 MOSFET.
--
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco
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[Elecraft] K3 Key Out

[W6SX Hank Garretson]

The K3's Key Out is rated for +200V at 5 Amps.


Inside the K3, is Key Out a relay or solid state?


73,

Hank, W6SX

Mammoth Lakes, California

Elevation 8083 feet in John Muir's Range of Light 



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[Elecraft] K3 - KEY OUT missing

[Benny Aumala]

Anybody with these symptoms:
With mike PTT (hard ground) I can easily command the amplifier through K3.
But with straight key or inbuilt keyer the KEY OUT is not grounding.
K3 itself sends OK.
Unfortunately I have not found schematic of back panel and the
power FET used in keying.
It also crossed my mind to have some switch wrong.

Benny   OH9NB
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