Re: [Elecraft] K3 apparent PA failure Update.

[Matthew Cook]

Martin,

Contact Elecraft support.   I purchased a pair of the same MOSFET's a
couple of years or so ago when my K3 did the same as yours...

Unfortunately mines done it again just recently, so this time I'm ordering
a few spares.

73

Matthew
VK5ZM

On 10 April 2018 at 14:32, Martin Sole  wrote:

> Hi,
>
> Both output devices in the LPA, Q4 and Q5, RD15HVF-1, show low ohms gate
> to source, one is 2.4 ohms the other 4.6 ohms.
>
> Anyone have a recommended source? I don't think these are available
> locally, I'll need to get a couple shipped in from US or elsewhere most
> likely.
>
> Thanks
> Martin, HS0ZED
>
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Re: [Elecraft] K3 apparent PA failure Update.

[Martin Sole]

Hi,

Both output devices in the LPA, Q4 and Q5, RD15HVF-1, show low ohms gate 
to source, one is 2.4 ohms the other 4.6 ohms.


Anyone have a recommended source? I don't think these are available 
locally, I'll need to get a couple shipped in from US or elsewhere most 
likely.


Thanks
Martin, HS0ZED

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Re: [Elecraft] K3 apparent PA failure

[Brian Hunt]

Have you tried doing a TX GAIN calibration?  It will likely fail given what you 
are seeing but it's another step to try. 

GL & 73,
Brian, K0DTJ

> On Apr 9, 2018, at 18:11, Martin Sole  wrote:
> 
> Hi,
> 
> I can see output at the XVTR OUT jack. Using direct input on the LP-100A 
> meter it shows output varyng in sympathy with the output level control  and a 
> setting of L 1.00 gives pretty much 1dBm on the LP-100A. Lowest I can read is 
> around -12dBm and highest about +3dBm before the K3 switches to H 0.1. Then 
> on the main ant jack I see nothing.
> 
> I'm thinking this has to be somewhere between the input to the LPA and the 
> output.
> 
> Does the SWR bridge need to see some output? Just wondering if something were 
> fried in the the bridge so it's feeding nothing back to the measuring circuit 
> does that cause the PA chain to essentially shut down?
> 
> Martin, HS0ZED
> 

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Re: [Elecraft] K3 apparent PA failure

[Martin Sole]

Hi,

I can see output at the XVTR OUT jack. Using direct input on the LP-100A 
meter it shows output varyng in sympathy with the output level control  
and a setting of L 1.00 gives pretty much 1dBm on the LP-100A. Lowest I 
can read is around -12dBm and highest about +3dBm before the K3 switches 
to H 0.1. Then on the main ant jack I see nothing.


I'm thinking this has to be somewhere between the input to the LPA and 
the output.


Does the SWR bridge need to see some output? Just wondering if something 
were fried in the the bridge so it's feeding nothing back to the 
measuring circuit does that cause the PA chain to essentially shut down?


Martin, HS0ZED


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Re: [Elecraft] K3 Apparent PA failure ?

[Martin Sole]

Hi,

I see about 1.17A in receive and only 1.8A in TX TUNE mode with the the 
PWR control set at 110W.


Martin, HS0ZED


On 10/04/2018 07:38, Al Lorona wrote:

Martin,

Does the K3 draw any current from the power supply when you go into 
TUNE? If so, then maybe the power meter is bad.


If not, then there is something wrong in the DC power to the amplifier 
stages.


Al  W6LX



*From:* Martin Sole <hs0...@gmail.com>
*To:* elecraft@mailman.qth.net
*Sent:* Monday, April 9, 2018 5:36 PM
*Subject:* Re: [Elecraft] K3 Apparent PA failure ?

Hi,

Well I've been through all of the operational settings. CONFIG : TUN PWR
is set to NOR and I can vary the power with the power control but the
output meter display stays at 0.0 and the VSWR displays only - - . I had
a settings save from about a month ago but uploading that hasn't changed
anything.

Since this affects both the 100 watt PA and the LPA I'm guessing the 100
watt PA is probably good and that the failure must be earlier on.

My next test is to look at the XVTR output as I see that is taken off
before both amplifiers to see if there is anything there.

Martin, HS0ZED


>> Hi,
>>
>> My K3 died today, somehow. The radio works fine on receive and
>> appears to transmit just there is no power indication on my external
>> meter or on the front panel when pressing TUNE. There is ALC
>> indication but no power out indication.The only thing I did different
>> was to switch off the supply before the radio, something I normally
>> never do. Having noted others having issues with that I reloaded the
>> firmware. Still no output. Starting to think that somehow the PA is
>> fried or possibly the driver as there is nothing from the 10 watt PA
>> either. Tried turning the power down and putting the KPA3 into
>> bypass. Still no power output. Not sure what else to try before I
>> tear into it. Was going great, worked 3B7A on 3 bands today no problem.
>>
>> Suggestions appreciated.
>>
>> Thanks
>> Martin, HS0ZED
>>
>> __
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Re: [Elecraft] K3 Apparent PA failure ?

[Martin Sole]

Hi,

Well I've been through all of the operational settings. CONFIG : TUN PWR 
is set to NOR and I can vary the power with the power control but the 
output meter display stays at 0.0 and the VSWR displays only - - . I had 
a settings save from about a month ago but uploading that hasn't changed 
anything.


Since this affects both the 100 watt PA and the LPA I'm guessing the 100 
watt PA is probably good and that the failure must be earlier on.


My next test is to look at the XVTR output as I see that is taken off 
before both amplifiers to see if there is anything there.


Martin, HS0ZED



Hi,

My K3 died today, somehow. The radio works fine on receive and 
appears to transmit just there is no power indication on my external 
meter or on the front panel when pressing TUNE. There is ALC 
indication but no power out indication.The only thing I did different 
was to switch off the supply before the radio, something I normally 
never do. Having noted others having issues with that I reloaded the 
firmware. Still no output. Starting to think that somehow the PA is 
fried or possibly the driver as there is nothing from the 10 watt PA 
either. Tried turning the power down and putting the KPA3 into 
bypass. Still no power output. Not sure what else to try before I 
tear into it. Was going great, worked 3B7A on 3 bands today no problem.


Suggestions appreciated.

Thanks
Martin, HS0ZED

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[Elecraft] K3 apparent PA failure

[gfinch]

Had the same thing happen here to my K3s but only with the high power board. 
The low power 0 to 12 watt board continued to work normally. Tried a transmit 
gain calibration with no effect.
I sent it back to Elecraft and they replaced both the low and high power boards 
with revisions they deemed "more stable" - KPA3A Rev C9, and KLPA3A Rev B3. 
Greg, W1GF
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Re: [Elecraft] K3 Apparent PA failure ?

[Victor Rosenthal 4X6GP]

That's what I would try next.


73,
Victor, 4X6GP
Rehovot, Israel
Formerly K2VCO
http://www.qsl.net/k2vco/

Vic

On 9 Apr 2018 20:18, Brian Hunt wrote:

Do you have a saved CONFIG file you can reload?  Maybe those data got
garbled by the nonstandard shutdown?  GL!

Brian, K0DTJ




On Apr 9, 2018, at 08:31, Martin Sole  wrote:

Hi,

My K3 died today, somehow. The radio works fine on receive and
appears to transmit just there is no power indication on my
external meter or on the front panel when pressing TUNE. There is
ALC indication but no power out indication.The only thing I did
different was to switch off the supply before the radio, something
I normally never do. Having noted others having issues with that I
reloaded the firmware. Still no output. Starting to think that
somehow the PA is fried or possibly the driver as there is nothing
from the 10 watt PA either. Tried turning the power down and
putting the KPA3 into bypass. Still no power output. Not sure what
else to try before I tear into it. Was going great, worked 3B7A on
3 bands today no problem.

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Re: [Elecraft] K3 Apparent PA failure ?

[Mike Flowers]

I tried that on my K3 and it will me dial it down to 00.1 - then it says 'nor'.

At 00.1 mine shows 00.1 RF out in TUNE.

- 73 and good DX de Mike, K6MKF, Past President - NCDXC 

> -Original Message-
> From: elecraft-boun...@mailman.qth.net <elecraft-boun...@mailman.qth.net>
> On Behalf Of Tom
> Sent: Monday, April 09, 2018 10:26 AM
> To: Martin Sole <hs0...@gmail.com>; k...@arrl.net
> Cc: Elecraft Discussion List <elecraft@mailman.qth.net>
> Subject: Re: [Elecraft] K3 Apparent PA failure ?
> 
> Hi,
> Is it possible that menu "Tune PWR" is set to 0?
> Tom
> 
> -Original Message-
> From: Martin Sole
> Sent: Monday, April 9, 2018 12:35 PM
> To: k...@arrl.net
> Cc: Elecraft Discussion List
> Subject: Re: [Elecraft] K3 Apparent PA failure ?
> 
> I’m pressing TUNE. Mode VOX etc shouldn’t matter.
> 
> Martin, HS0ZED
> 
> 
> Sent from my iPad
> 
> > On 9 Apr 2018, at 23:32, Dave Sublette <k4to.d...@gmail.com> wrote:
> >
> > Are you in CW mode? If so, is VOX enabled?
> >
> > K4TO
> >
> >> On Mon, Apr 9, 2018 at 12:20 PM, Martin Sole <hs0...@gmail.com> wrote:
> >> Not in test mode :(
> >>
> >> I get the red TX led bit the display show 0w and - - where the VSWR
> >> display would be when I press TUNE in TX NORM.
> >>
> >> Martin, HS0ZED
> >>
> >>
> >>
> >>> On 09/04/2018 22:56, Dave Cole (NK7Z) wrote:
> >>> Press and hold the right side of the band-switch over "Test" and
> >>> make sure you are not in test mode.
> >>>
> >>> You should see the words:
> >>>
> >>> "TX TEST"
> >>>
> >>> or
> >>>
> >>> "TX NORMAL"
> >>>
> >>> It should say "TX NORMAL".
> >>>
> >>> 73s and thanks,
> >>> Dave
> >>> NK7Z
> >>> https://www.nk7z.net
> >>>
> >>>> On 04/09/2018 08:31 AM, Martin Sole wrote:
> >>>> Hi,
> >>>>
> >>>> My K3 died today, somehow. The radio works fine on receive and
> >>>> appears to transmit just there is no power indication on my
> >>>> external meter or on the front panel when pressing TUNE. There is
> >>>> ALC indication but no power out indication.The only thing I did
> >>>> different was to switch off the supply before the radio, something
> >>>> I normally never do. Having noted others having issues with that I
> >>>> reloaded the firmware. Still no output. Starting to think that
> >>>> somehow the PA is fried or possibly the driver as there is nothing
> >>>> from the 10 watt PA either. Tried turning the power down and putting the
> KPA3 into bypass. Still no power output.
> >>>> Not sure what else to try before I tear into it. Was going great,
> >>>> worked 3B7A on 3 bands today no problem.
> >>>>
> >>>> Suggestions appreciated.
> >>>>
> >>>> Thanks
> >>>> Martin, HS0ZED
> >>>>
> >>>>
> __
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> >>>> email list: http://www.qsl.net/donate.html Message delivered to
> >>>> d...@nk7z.net
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> >>
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Re: [Elecraft] K3 Apparent PA failure ?

[Tom]

Hi,
Is it possible that menu "Tune PWR" is set to 0?
Tom

-Original Message- 
From: Martin Sole

Sent: Monday, April 9, 2018 12:35 PM
To: k...@arrl.net
Cc: Elecraft Discussion List
Subject: Re: [Elecraft] K3 Apparent PA failure ?

I’m pressing TUNE. Mode VOX etc shouldn’t matter.

Martin, HS0ZED


Sent from my iPad


On 9 Apr 2018, at 23:32, Dave Sublette <k4to.d...@gmail.com> wrote:

Are you in CW mode? If so, is VOX enabled?

K4TO


On Mon, Apr 9, 2018 at 12:20 PM, Martin Sole <hs0...@gmail.com> wrote:
Not in test mode :(

I get the red TX led bit the display show 0w and - - where the VSWR 
display would be when I press TUNE in TX NORM.


Martin, HS0ZED




On 09/04/2018 22:56, Dave Cole (NK7Z) wrote:
Press and hold the right side of the band-switch over "Test" and make 
sure you are not in test mode.


You should see the words:

"TX TEST"

or

"TX NORMAL"

It should say "TX NORMAL".

73s and thanks,
Dave
NK7Z
https://www.nk7z.net


On 04/09/2018 08:31 AM, Martin Sole wrote:
Hi,

My K3 died today, somehow. The radio works fine on receive and appears 
to transmit just there is no power indication on my external meter or 
on the front panel when pressing TUNE. There is ALC indication but no 
power out indication.The only thing I did different was to switch off 
the supply before the radio, something I normally never do. Having 
noted others having issues with that I reloaded the firmware. Still no 
output. Starting to think that somehow the PA is fried or possibly the 
driver as there is nothing from the 10 watt PA either. Tried turning 
the power down and putting the KPA3 into bypass. Still no power output. 
Not sure what else to try before I tear into it. Was going great, 
worked 3B7A on 3 bands today no problem.


Suggestions appreciated.

Thanks
Martin, HS0ZED

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Re: [Elecraft] K3 Apparent PA failure ?

[Nr4c]

In TX TEST mode the “TX” symbol on the right end of the display will flash 
about once per second. No need to try turning it On to see if it’s on or not.  

Sent from my iPhone
...nr4c. bill


> On Apr 9, 2018, at 11:56 AM, Dave Cole (NK7Z)  wrote:
> 
> Press and hold the right side of the band-switch over "Test" and make sure 
> you are not in test mode.
> 
> You should see the words:
> 
> "TX TEST"
> 
> or
> 
> "TX NORMAL"
> 
> It should say "TX NORMAL".
> 
> 73s and thanks,
> Dave
> NK7Z
> https://www.nk7z.net
> 
>> On 04/09/2018 08:31 AM, Martin Sole wrote:
>> Hi,
>> My K3 died today, somehow. The radio works fine on receive and appears to 
>> transmit just there is no power indication on my external meter or on the 
>> front panel when pressing TUNE. There is ALC indication but no power out 
>> indication.The only thing I did different was to switch off the supply 
>> before the radio, something I normally never do. Having noted others having 
>> issues with that I reloaded the firmware. Still no output. Starting to think 
>> that somehow the PA is fried or possibly the driver as there is nothing from 
>> the 10 watt PA either. Tried turning the power down and putting the KPA3 
>> into bypass. Still no power output. Not sure what else to try before I tear 
>> into it. Was going great, worked 3B7A on 3 bands today no problem.
>> Suggestions appreciated.
>> Thanks
>> Martin, HS0ZED
>> __
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Re: [Elecraft] K3 Apparent PA failure ?

[Brian Hunt]

Do you have a saved CONFIG file you can reload?  Maybe those data got garbled 
by the nonstandard shutdown?  GL!

Brian, K0DTJ



> On Apr 9, 2018, at 08:31, Martin Sole  wrote:
> 
> Hi,
> 
> My K3 died today, somehow. The radio works fine on receive and appears to 
> transmit just there is no power indication on my external meter or on the 
> front panel when pressing TUNE. There is ALC indication but no power out 
> indication.The only thing I did different was to switch off the supply before 
> the radio, something I normally never do. Having noted others having issues 
> with that I reloaded the firmware. Still no output. Starting to think that 
> somehow the PA is fried or possibly the driver as there is nothing from the 
> 10 watt PA either. Tried turning the power down and putting the KPA3 into 
> bypass. Still no power output. Not sure what else to try before I tear into 
> it. Was going great, worked 3B7A on 3 bands today no problem.
> 

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Re: [Elecraft] K3 apparent PA failure

[Nr4c]

For what?

Sent from my iPhone
...nr4c. bill


> On Apr 9, 2018, at 1:07 PM, Roy Koeppe  wrote:
> 
> VOX needs be ‘ON.’
> 
> Roy  K6XK
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Re: [Elecraft] K3 apparent PA failure

[Roy Koeppe]

VOX needs be ‘ON.’

Roy  K6XK
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[Elecraft] K3 Apparent PA failure ?

[j...@kk9a.com]

This should not matter pressing the XMIT button.

John

John KK9A

Dave Sublette k4to.dave at gmail.com

Are you in CW mode? If so, is VOX enabled?

K4TO

>>
>> On 04/09/2018 08:31 AM, Martin Sole wrote:
>>
>>> Hi,
>>>
>>> My K3 died today, somehow. The radio works fine on receive and appears
>>> to transmit just there is no power indication on my external meter or on
>>> the front panel when pressing TUNE. There is ALC indication but no power
>>> out indication.The only thing I did different was to switch off the
supply
>>> before the radio, something I normally never do. Having noted others
having
>>> issues with that I reloaded the firmware. Still no output. Starting to
>>> think that somehow the PA is fried or possibly the driver as there is
>>> nothing from the 10 watt PA either. Tried turning the power down and
>>> putting the KPA3 into bypass. Still no power output. Not sure what
else to
>>> try before I tear into it. Was going great, worked 3B7A on 3 bands
today no
>>> problem.
>>>
>>> Suggestions appreciated.
>>>
>>> Thanks
>>> Martin, HS0ZED
>>>

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Re: [Elecraft] K3 Apparent PA failure ?

[Martin Sole]

I’m pressing TUNE. Mode VOX etc shouldn’t matter.

Martin, HS0ZED


Sent from my iPad

> On 9 Apr 2018, at 23:32, Dave Sublette  wrote:
> 
> Are you in CW mode? If so, is VOX enabled?
> 
> K4TO
> 
>> On Mon, Apr 9, 2018 at 12:20 PM, Martin Sole  wrote:
>> Not in test mode :(
>> 
>> I get the red TX led bit the display show 0w and - - where the VSWR display 
>> would be when I press TUNE in TX NORM.
>> 
>> Martin, HS0ZED
>> 
>> 
>> 
>>> On 09/04/2018 22:56, Dave Cole (NK7Z) wrote:
>>> Press and hold the right side of the band-switch over "Test" and make sure 
>>> you are not in test mode.
>>> 
>>> You should see the words:
>>> 
>>> "TX TEST"
>>> 
>>> or
>>> 
>>> "TX NORMAL"
>>> 
>>> It should say "TX NORMAL".
>>> 
>>> 73s and thanks,
>>> Dave
>>> NK7Z
>>> https://www.nk7z.net
>>> 
 On 04/09/2018 08:31 AM, Martin Sole wrote:
 Hi,
 
 My K3 died today, somehow. The radio works fine on receive and appears to 
 transmit just there is no power indication on my external meter or on the 
 front panel when pressing TUNE. There is ALC indication but no power out 
 indication.The only thing I did different was to switch off the supply 
 before the radio, something I normally never do. Having noted others 
 having issues with that I reloaded the firmware. Still no output. Starting 
 to think that somehow the PA is fried or possibly the driver as there is 
 nothing from the 10 watt PA either. Tried turning the power down and 
 putting the KPA3 into bypass. Still no power output. Not sure what else to 
 try before I tear into it. Was going great, worked 3B7A on 3 bands today 
 no problem.
 
 Suggestions appreciated.
 
 Thanks
 Martin, HS0ZED
 
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Re: [Elecraft] K3 Apparent PA failure ?

[Dave Sublette]

Are you in CW mode? If so, is VOX enabled?

K4TO

On Mon, Apr 9, 2018 at 12:20 PM, Martin Sole  wrote:

> Not in test mode :(
>
> I get the red TX led bit the display show 0w and - - where the VSWR
> display would be when I press TUNE in TX NORM.
>
> Martin, HS0ZED
>
>
>
> On 09/04/2018 22:56, Dave Cole (NK7Z) wrote:
>
>> Press and hold the right side of the band-switch over "Test" and make
>> sure you are not in test mode.
>>
>> You should see the words:
>>
>> "TX TEST"
>>
>> or
>>
>> "TX NORMAL"
>>
>> It should say "TX NORMAL".
>>
>> 73s and thanks,
>> Dave
>> NK7Z
>> https://www.nk7z.net
>>
>> On 04/09/2018 08:31 AM, Martin Sole wrote:
>>
>>> Hi,
>>>
>>> My K3 died today, somehow. The radio works fine on receive and appears
>>> to transmit just there is no power indication on my external meter or on
>>> the front panel when pressing TUNE. There is ALC indication but no power
>>> out indication.The only thing I did different was to switch off the supply
>>> before the radio, something I normally never do. Having noted others having
>>> issues with that I reloaded the firmware. Still no output. Starting to
>>> think that somehow the PA is fried or possibly the driver as there is
>>> nothing from the 10 watt PA either. Tried turning the power down and
>>> putting the KPA3 into bypass. Still no power output. Not sure what else to
>>> try before I tear into it. Was going great, worked 3B7A on 3 bands today no
>>> problem.
>>>
>>> Suggestions appreciated.
>>>
>>> Thanks
>>> Martin, HS0ZED
>>>
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Re: [Elecraft] K3 Apparent PA failure ?

[Martin Sole]

Not in test mode :(

I get the red TX led bit the display show 0w and - - where the VSWR 
display would be when I press TUNE in TX NORM.


Martin, HS0ZED



On 09/04/2018 22:56, Dave Cole (NK7Z) wrote:
Press and hold the right side of the band-switch over "Test" and make 
sure you are not in test mode.


You should see the words:

"TX TEST"

or

"TX NORMAL"

It should say "TX NORMAL".

73s and thanks,
Dave
NK7Z
https://www.nk7z.net

On 04/09/2018 08:31 AM, Martin Sole wrote:

Hi,

My K3 died today, somehow. The radio works fine on receive and 
appears to transmit just there is no power indication on my external 
meter or on the front panel when pressing TUNE. There is ALC 
indication but no power out indication.The only thing I did different 
was to switch off the supply before the radio, something I normally 
never do. Having noted others having issues with that I reloaded the 
firmware. Still no output. Starting to think that somehow the PA is 
fried or possibly the driver as there is nothing from the 10 watt PA 
either. Tried turning the power down and putting the KPA3 into 
bypass. Still no power output. Not sure what else to try before I 
tear into it. Was going great, worked 3B7A on 3 bands today no problem.


Suggestions appreciated.

Thanks
Martin, HS0ZED

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Re: [Elecraft] K3 Apparent PA failure ?

[Dave Cole (NK7Z)]

Press and hold the right side of the band-switch over "Test" and make 
sure you are not in test mode.


You should see the words:

"TX TEST"

or

"TX NORMAL"

It should say "TX NORMAL".

73s and thanks,
Dave
NK7Z
https://www.nk7z.net

On 04/09/2018 08:31 AM, Martin Sole wrote:

Hi,

My K3 died today, somehow. The radio works fine on receive and appears 
to transmit just there is no power indication on my external meter or on 
the front panel when pressing TUNE. There is ALC indication but no power 
out indication.The only thing I did different was to switch off the 
supply before the radio, something I normally never do. Having noted 
others having issues with that I reloaded the firmware. Still no output. 
Starting to think that somehow the PA is fried or possibly the driver as 
there is nothing from the 10 watt PA either. Tried turning the power 
down and putting the KPA3 into bypass. Still no power output. Not sure 
what else to try before I tear into it. Was going great, worked 3B7A on 
3 bands today no problem.


Suggestions appreciated.

Thanks
Martin, HS0ZED

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[Elecraft] K3 Apparent PA failure ?

[Martin Sole]

Hi,

My K3 died today, somehow. The radio works fine on receive and appears 
to transmit just there is no power indication on my external meter or on 
the front panel when pressing TUNE. There is ALC indication but no power 
out indication.The only thing I did different was to switch off the 
supply before the radio, something I normally never do. Having noted 
others having issues with that I reloaded the firmware. Still no output. 
Starting to think that somehow the PA is fried or possibly the driver as 
there is nothing from the 10 watt PA either. Tried turning the power 
down and putting the KPA3 into bypass. Still no power output. Not sure 
what else to try before I tear into it. Was going great, worked 3B7A on 
3 bands today no problem.


Suggestions appreciated.

Thanks
Martin, HS0ZED

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