Re: [Elecraft] K3 - No RF output - Fault resolved

[G4BVH]

Very many thanks to everyone who responded to my request for help. Happily
the fault turned out to be something very simple. Rob at Elecraft suggested
the LPA FETs may have failed as the current measurements I had taken
indicated the FETs were not drawing the bias current they should be. I
checked the voltage on the FETs on the LPA module and found it to be 6.5V.
Looking at the circuit diagram this should have been 12V as the supply to
them comes directly from the 12V supply. I noticed the 12 pin edge connector
on the module did not seem to be fully seated. I eased it into place, the
FET voltage returned to a solid 12V and the rig is now functioning normally.

Again thanks to everyone who replied.

73, Peter, G4BVH



On 6/15/2020 4:04 AM, G4BVH wrote:
> Hi,
>
>   
>
> I have had a fault develop on my K3 whereby there is no RF being produced.
I
> have emailed the details to Elecraft support and am hoping to receive a
> reply with suggestions. However, I thought I would also send the details
> here in case anyone can suggest something to try or investigate further.
>
>   
>
> I have a K3, serial number 6482 which I built from a kit. It has worked
> flawlessly since I built it. I have the 400Hz and 2.7kHz (2.8kHz?) filters
> fitted and the 100W module but no other additions.
>
>   
>
> A few days ago, it was running 20W of FT8 and I suddenly discovered that
it
> hadn't been transmitting. Everything appeared that it should be
> transmitting: the red TX LED was lit, it was not in TEST mode (TX not
> flashing) but there was no RF output displayed on the bar graph and
> definitely nothing coming out on any mode. There is no RF if I wind down
the
> power below the 10W level, there is the usual relay click going through
12W
> - 13W and still no RF above this level, ie on towards 100W.
>
>   
>
> The K3 metering shows 13.5V and 0.84 on receive, 0.97A on the lower power
> level setting and 1.18A on the higher power setting on transmit. The RF
> output bar graph always displays 1 bar on transmit no matter what the
power
> level  is set but there is no RF coming out.
>
>   
>
> I tried the TX calibration but it fails saying the power level didn't
reach
> that required.
>
>   
>
> The receiver works fine and I can hear the CW side tone and SSB, AM and FM
> audio monitoring as normal.
>
>   
>
> I have removed and reseated the front panel and also the 3 coax patch
leads
> behind the front panel but this made no difference. There is a yellow LED,
> D33, on the main board which is lit on receive and goes out on transmit.
>
>   
>
> The latest firmware is installed - I updated this a month or so ago.
>
>   
>
> TX inhibit is OFF and the 20A breaker has not tripped.
>
>   
>
> Any thoughts or suggestions gratefully received.
>
>   
>
> Very many thanks and 73,
>
>   
>
> Peter, G4BVH
>
>   
>
>   
>
>
>

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Re: [Elecraft] K3 - No RF output

[Vic Rosenthal]

Check that TX INHIBIT is off in the menu.

Victor 4X6GP 

> On 16 Jun 2020, at 0:35, G4BVH  wrote:
> 
> 
> 
> 
> 
> 
>Hi Bill,The rig doesnot produce any RF out in any mode. Everything 
> looks normal on the display, LEDs etc, the rig keys via mic or paddle but 
> just no RF.Some have suggested a bad internal cable connection or bad board 
> edge connector. I am working my way through those. 73, Peter G4BVH
>
>
> 
>Get Outlook for iOS
> 
> 
> 
> 
> 
> 
> On Mon, Jun 15, 2020 at 2:45 PM +0100, "Bill Steffey NY9H"  
> wrote:
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> DOES k3 xmit ssb with a mic in usb ?
> 
> what mode ( TXDATA) are you using ...
> 
> usually when I have that symptom, turns out that computer sound card is 
> NOT putting out TX audio to rig.
> 
> 
>> On 6/15/2020 4:04 AM, G4BVH wrote:
>> Hi,
>> 
>> 
>> 
>> I have had a fault develop on my K3 whereby there is no RF being produced. I
>> have emailed the details to Elecraft support and am hoping to receive a
>> reply with suggestions. However, I thought I would also send the details
>> here in case anyone can suggest something to try or investigate further.
>> 
>> 
>> 
>> I have a K3, serial number 6482 which I built from a kit. It has worked
>> flawlessly since I built it. I have the 400Hz and 2.7kHz (2.8kHz?) filters
>> fitted and the 100W module but no other additions.
>> 
>> 
>> 
>> A few days ago, it was running 20W of FT8 and I suddenly discovered that it
>> hadn't been transmitting. Everything appeared that it should be
>> transmitting: the red TX LED was lit, it was not in TEST mode (TX not
>> flashing) but there was no RF output displayed on the bar graph and
>> definitely nothing coming out on any mode. There is no RF if I wind down the
>> power below the 10W level, there is the usual relay click going through 12W
>> - 13W and still no RF above this level, ie on towards 100W.
>> 
>> 
>> 
>> The K3 metering shows 13.5V and 0.84 on receive, 0.97A on the lower power
>> level setting and 1.18A on the higher power setting on transmit. The RF
>> output bar graph always displays 1 bar on transmit no matter what the power
>> level  is set but there is no RF coming out.
>> 
>> 
>> 
>> I tried the TX calibration but it fails saying the power level didn't reach
>> that required.
>> 
>> 
>> 
>> The receiver works fine and I can hear the CW side tone and SSB, AM and FM
>> audio monitoring as normal.
>> 
>> 
>> 
>> I have removed and reseated the front panel and also the 3 coax patch leads
>> behind the front panel but this made no difference. There is a yellow LED,
>> D33, on the main board which is lit on receive and goes out on transmit.
>> 
>> 
>> 
>> The latest firmware is installed - I updated this a month or so ago.
>> 
>> 
>> 
>> TX inhibit is OFF and the 20A breaker has not tripped.
>> 
>> 
>> 
>> Any thoughts or suggestions gratefully received.
>> 
>> 
>> 
>> Very many thanks and 73,
>> 
>> 
>> 
>> Peter, G4BVH
>> 
>> 
>> 
>> 
>> 
>> 
>> 
> 
> -- 
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Re: [Elecraft] K3 - No RF output

[G4BVH]

  
  
  

Hi Bill,The rig does not produce any RF out in any mode. Everything 
looks normal on the display, LEDs etc, the rig keys via mic or paddle but just 
no RF.Some have suggested a bad internal cable connection or bad board edge 
connector. I am working my way through those. 73, Peter G4BVH



Get Outlook for iOS

  




On Mon, Jun 15, 2020 at 2:45 PM +0100, "Bill Steffey NY9H"  
wrote:










DOES k3 xmit ssb with a mic in usb ?

what mode ( TXDATA) are you using ...

usually when I have that symptom, turns out that computer sound card is 
NOT putting out TX audio to rig.


On 6/15/2020 4:04 AM, G4BVH wrote:
> Hi,
>
>   
>
> I have had a fault develop on my K3 whereby there is no RF being produced. I
> have emailed the details to Elecraft support and am hoping to receive a
> reply with suggestions. However, I thought I would also send the details
> here in case anyone can suggest something to try or investigate further.
>
>   
>
> I have a K3, serial number 6482 which I built from a kit. It has worked
> flawlessly since I built it. I have the 400Hz and 2.7kHz (2.8kHz?) filters
> fitted and the 100W module but no other additions.
>
>   
>
> A few days ago, it was running 20W of FT8 and I suddenly discovered that it
> hadn't been transmitting. Everything appeared that it should be
> transmitting: the red TX LED was lit, it was not in TEST mode (TX not
> flashing) but there was no RF output displayed on the bar graph and
> definitely nothing coming out on any mode. There is no RF if I wind down the
> power below the 10W level, there is the usual relay click going through 12W
> - 13W and still no RF above this level, ie on towards 100W.
>
>   
>
> The K3 metering shows 13.5V and 0.84 on receive, 0.97A on the lower power
> level setting and 1.18A on the higher power setting on transmit. The RF
> output bar graph always displays 1 bar on transmit no matter what the power
> level  is set but there is no RF coming out.
>
>   
>
> I tried the TX calibration but it fails saying the power level didn't reach
> that required.
>
>   
>
> The receiver works fine and I can hear the CW side tone and SSB, AM and FM
> audio monitoring as normal.
>
>   
>
> I have removed and reseated the front panel and also the 3 coax patch leads
> behind the front panel but this made no difference. There is a yellow LED,
> D33, on the main board which is lit on receive and goes out on transmit.
>
>   
>
> The latest firmware is installed - I updated this a month or so ago.
>
>   
>
> TX inhibit is OFF and the 20A breaker has not tripped.
>
>   
>
> Any thoughts or suggestions gratefully received.
>
>   
>
> Very many thanks and 73,
>
>   
>
> Peter, G4BVH
>
>   
>
>   
>
>
>

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Re: [Elecraft] K3 - No RF output

[Bill Steffey NY9H]

DOES k3 xmit ssb with a mic in usb ?

what mode ( TXDATA) are you using ...

usually when I have that symptom, turns out that computer sound card is 
NOT putting out TX audio to rig.



On 6/15/2020 4:04 AM, G4BVH wrote:

Hi,

  


I have had a fault develop on my K3 whereby there is no RF being produced. I
have emailed the details to Elecraft support and am hoping to receive a
reply with suggestions. However, I thought I would also send the details
here in case anyone can suggest something to try or investigate further.

  


I have a K3, serial number 6482 which I built from a kit. It has worked
flawlessly since I built it. I have the 400Hz and 2.7kHz (2.8kHz?) filters
fitted and the 100W module but no other additions.

  


A few days ago, it was running 20W of FT8 and I suddenly discovered that it
hadn't been transmitting. Everything appeared that it should be
transmitting: the red TX LED was lit, it was not in TEST mode (TX not
flashing) but there was no RF output displayed on the bar graph and
definitely nothing coming out on any mode. There is no RF if I wind down the
power below the 10W level, there is the usual relay click going through 12W
- 13W and still no RF above this level, ie on towards 100W.

  


The K3 metering shows 13.5V and 0.84 on receive, 0.97A on the lower power
level setting and 1.18A on the higher power setting on transmit. The RF
output bar graph always displays 1 bar on transmit no matter what the power
level  is set but there is no RF coming out.

  


I tried the TX calibration but it fails saying the power level didn't reach
that required.

  


The receiver works fine and I can hear the CW side tone and SSB, AM and FM
audio monitoring as normal.

  


I have removed and reseated the front panel and also the 3 coax patch leads
behind the front panel but this made no difference. There is a yellow LED,
D33, on the main board which is lit on receive and goes out on transmit.

  


The latest firmware is installed - I updated this a month or so ago.

  


TX inhibit is OFF and the 20A breaker has not tripped.

  


Any thoughts or suggestions gratefully received.

  


Very many thanks and 73,

  


Peter, G4BVH

  

  






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Re: [Elecraft] K3 - No RF output

[Wes]

On 6/15/2020 1:10 AM, Dick Dievendorff wrote:

Is TX test on?

73 de Dick, K6KR


On Jun 15, 2020, at 01:06, G4BVH  wrote:

Hi,



I have had a fault develop on my K3 whereby there is no RF being produced. I
have emailed the details to Elecraft support and am hoping to receive a
reply with suggestions. However, I thought I would also send the details
here in case anyone can suggest something to try or investigate further.



I have a K3, serial number 6482 which I built from a kit. It has worked
flawlessly since I built it. I have the 400Hz and 2.7kHz (2.8kHz?) filters
fitted and the 100W module but no other additions.



A few days ago, it was running 20W of FT8 and I suddenly discovered that it
hadn't been transmitting. Everything appeared that it should be
transmitting: the red TX LED was lit,_it was not in TEST mode (TX not 
flashing)_  but there was no RF output displayed on the bar graph and
definitely nothing coming out on any mode. There is no RF if I wind down the
power below the 10W level, there is the usual relay click going through 12W
- 13W and still no RF above this level, ie on towards 100W.



The K3 metering shows 13.5V and 0.84 on receive, 0.97A on the lower power
level setting and 1.18A on the higher power setting on transmit. The RF
output bar graph always displays 1 bar on transmit no matter what the power
level  is set but there is no RF coming out.



I tried the TX calibration but it fails saying the power level didn't reach
that required.



The receiver works fine and I can hear the CW side tone and SSB, AM and FM
audio monitoring as normal.



I have removed and reseated the front panel and also the 3 coax patch leads
behind the front panel but this made no difference. There is a yellow LED,
D33, on the main board which is lit on receive and goes out on transmit.



The latest firmware is installed - I updated this a month or so ago.



TX inhibit is OFF and the 20A breaker has not tripped.



Any thoughts or suggestions gratefully received.



Very many thanks and 73,



Peter, G4BVH






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Re: [Elecraft] K3 - No RF output

[WILLIE BABER]

 I had a problem with no output, but the radio was keying. I reseated all 
cables going to the synthesizer, and rf output returned. 

73, Will, wj9b

CWops #1085
CWA Advisor levels II and III
http://cwops.org/
 On Monday, June 15, 2020, 01:04:50 AM PDT, G4BVH  
wrote:  
 
 Hi,

 

I have had a fault develop on my K3 whereby there is no RF being produced. I
have emailed the details to Elecraft support and am hoping to receive a
reply with suggestions. However, I thought I would also send the details
here in case anyone can suggest something to try or investigate further.

 

I have a K3, serial number 6482 which I built from a kit. It has worked
flawlessly since I built it. I have the 400Hz and 2.7kHz (2.8kHz?) filters
fitted and the 100W module but no other additions.

 

A few days ago, it was running 20W of FT8 and I suddenly discovered that it
hadn't been transmitting. Everything appeared that it should be
transmitting: the red TX LED was lit, it was not in TEST mode (TX not
flashing) but there was no RF output displayed on the bar graph and
definitely nothing coming out on any mode. There is no RF if I wind down the
power below the 10W level, there is the usual relay click going through 12W
- 13W and still no RF above this level, ie on towards 100W.

 

The K3 metering shows 13.5V and 0.84 on receive, 0.97A on the lower power
level setting and 1.18A on the higher power setting on transmit. The RF
output bar graph always displays 1 bar on transmit no matter what the power
level  is set but there is no RF coming out.

 

I tried the TX calibration but it fails saying the power level didn't reach
that required.

 

The receiver works fine and I can hear the CW side tone and SSB, AM and FM
audio monitoring as normal.

 

I have removed and reseated the front panel and also the 3 coax patch leads
behind the front panel but this made no difference. There is a yellow LED,
D33, on the main board which is lit on receive and goes out on transmit.

 

The latest firmware is installed - I updated this a month or so ago.

 

TX inhibit is OFF and the 20A breaker has not tripped.

 

Any thoughts or suggestions gratefully received.

 

Very many thanks and 73,

 

Peter, G4BVH

 

 



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Re: [Elecraft] K3 - No RF output

[Dick Dievendorff]

Is TX test on?

73 de Dick, K6KR

> On Jun 15, 2020, at 01:06, G4BVH  wrote:
> 
> Hi,
> 
> 
> 
> I have had a fault develop on my K3 whereby there is no RF being produced. I
> have emailed the details to Elecraft support and am hoping to receive a
> reply with suggestions. However, I thought I would also send the details
> here in case anyone can suggest something to try or investigate further.
> 
> 
> 
> I have a K3, serial number 6482 which I built from a kit. It has worked
> flawlessly since I built it. I have the 400Hz and 2.7kHz (2.8kHz?) filters
> fitted and the 100W module but no other additions.
> 
> 
> 
> A few days ago, it was running 20W of FT8 and I suddenly discovered that it
> hadn't been transmitting. Everything appeared that it should be
> transmitting: the red TX LED was lit, it was not in TEST mode (TX not
> flashing) but there was no RF output displayed on the bar graph and
> definitely nothing coming out on any mode. There is no RF if I wind down the
> power below the 10W level, there is the usual relay click going through 12W
> - 13W and still no RF above this level, ie on towards 100W.
> 
> 
> 
> The K3 metering shows 13.5V and 0.84 on receive, 0.97A on the lower power
> level setting and 1.18A on the higher power setting on transmit. The RF
> output bar graph always displays 1 bar on transmit no matter what the power
> level  is set but there is no RF coming out.
> 
> 
> 
> I tried the TX calibration but it fails saying the power level didn't reach
> that required.
> 
> 
> 
> The receiver works fine and I can hear the CW side tone and SSB, AM and FM
> audio monitoring as normal.
> 
> 
> 
> I have removed and reseated the front panel and also the 3 coax patch leads
> behind the front panel but this made no difference. There is a yellow LED,
> D33, on the main board which is lit on receive and goes out on transmit.
> 
> 
> 
> The latest firmware is installed - I updated this a month or so ago.
> 
> 
> 
> TX inhibit is OFF and the 20A breaker has not tripped.
> 
> 
> 
> Any thoughts or suggestions gratefully received.
> 
> 
> 
> Very many thanks and 73,
> 
> 
> 
> Peter, G4BVH
> 
> 
> 
> 
> 
> 
> 
> -- 
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[Elecraft] K3 - No RF output

[G4BVH]

Hi,

 

I have had a fault develop on my K3 whereby there is no RF being produced. I
have emailed the details to Elecraft support and am hoping to receive a
reply with suggestions. However, I thought I would also send the details
here in case anyone can suggest something to try or investigate further.

 

I have a K3, serial number 6482 which I built from a kit. It has worked
flawlessly since I built it. I have the 400Hz and 2.7kHz (2.8kHz?) filters
fitted and the 100W module but no other additions.

 

A few days ago, it was running 20W of FT8 and I suddenly discovered that it
hadn't been transmitting. Everything appeared that it should be
transmitting: the red TX LED was lit, it was not in TEST mode (TX not
flashing) but there was no RF output displayed on the bar graph and
definitely nothing coming out on any mode. There is no RF if I wind down the
power below the 10W level, there is the usual relay click going through 12W
- 13W and still no RF above this level, ie on towards 100W.

 

The K3 metering shows 13.5V and 0.84 on receive, 0.97A on the lower power
level setting and 1.18A on the higher power setting on transmit. The RF
output bar graph always displays 1 bar on transmit no matter what the power
level  is set but there is no RF coming out.

 

I tried the TX calibration but it fails saying the power level didn't reach
that required.

 

The receiver works fine and I can hear the CW side tone and SSB, AM and FM
audio monitoring as normal.

 

I have removed and reseated the front panel and also the 3 coax patch leads
behind the front panel but this made no difference. There is a yellow LED,
D33, on the main board which is lit on receive and goes out on transmit.

 

The latest firmware is installed - I updated this a month or so ago.

 

TX inhibit is OFF and the 20A breaker has not tripped.

 

Any thoughts or suggestions gratefully received.

 

Very many thanks and 73,

 

Peter, G4BVH

 

 



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Re: [Elecraft] K3 no RF Output

[Roy Morris, Jr. via Elecraft]

Check your TMP cable connections.

Sent from Mail for Windows 10

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[Elecraft] K3 no RF Output

[Harald Fritzsche]

Hello Readers,
i need to understand which point in the signal path i have to control/measure 
to investigate further damages in my K3 after water damage event.
yes, VOX is on.
When i have the place where the issue starts, i want to understand what is 
causing that behavior.
Currently receiver is working, but i have no RF output from PA. So i want to 
check the TX path.
During TX i see no output from DAC to TXIF in CW, i would expect a 15KHz signal 
there. But i find during RX on ADC an input signal(bandwidth 2Khz @ 16KHz).
I only see an 8230KHz signal at roofing filter input.

First: ist this assumption right, to see 15KHz after DAC output? If yes on wich 
pin of which jumper?
If correct, what can cause, that the signal is not appearing.

Probably i could replace the RF board by a new one, but i want to avoid it.

vy73
Harald
DD0VS


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Re: [Elecraft] K3 no RF Output

[Nr4c]

Is VOX On?

Sent from my iPhone
...nr4c. bill


> On Jul 21, 2019, at 2:32 PM, Harald Fritzsche  wrote:
> 
> Dear Readers,
> 
> i made a water damage of my K3. Meanwhile Receiver is working again, after 
> some repairs.
> 
> But there is still no RF output.
> 
> Main symptom is, that in case of TX (key down in CW) i find at J7 (8.215 MHz 
> TXIF1) a 8.230MHz signal, but no signal passing the filter, expected 
> approxymatetly 8.215Mhz too.
> 
> Any suggestions?
> 
> Regards
> Harald
> DD0VS
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[Elecraft] K3 no RF Output

[Harald Fritzsche]

Dear Readers,

i made a water damage of my K3. Meanwhile Receiver is working again, after some 
repairs.

But there is still no RF output.

Main symptom is, that in case of TX (key down in CW) i find at J7 (8.215 MHz 
TXIF1) a 8.230MHz signal, but no signal passing the filter, expected 
approxymatetly 8.215Mhz too.

Any suggestions?

Regards
Harald
DD0VS
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Re: [Elecraft] K3: Low RF output only on 30 meters

[Don Wilhelm]

Scott,

Try running TX Gain Calibration with K3 Utility.  If that fails, try 
running it on 30 meters manually (see the manual for the procedure).

If it still fails contact Elecraft K3support.

73,
Don W3FPR

On 1/25/2016 12:30 AM, Scott Manthe wrote:

Hello to the list!

I fired up my K3 tonight for the first time in months to try to work 
K5P and the VP8 expeditions. Thing seemed to be working fine until I 
tried working the VP8 on 30 meters. I noticed while sending that I 
didn't have much output on 30 meters. Investigating, I get output 
until I hit the threshold when the KPA100 kicks in. Full output until 
I got past 12 watts and them little or no output past that point. I 
seem to be getting full output on the other bands. Any guesses? It's 
vexing...


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[Elecraft] K3: Low RF output only on 30 meters

[Scott Manthe]

Hello to the list!

I fired up my K3 tonight for the first time in months to try to work K5P 
and the VP8 expeditions. Thing seemed to be working fine until I tried 
working the VP8 on 30 meters. I noticed while sending that I didn't have 
much output on 30 meters. Investigating, I get output until I hit the 
threshold when the KPA100 kicks in. Full output until I got past 12 
watts and them little or no output past that point. I seem to be getting 
full output on the other bands. Any guesses? It's vexing...


73,
Scott N9AA
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Re: [Elecraft] K3: Low RF output only on 30 meters

[Scott Manthe]

That should read KPA3, not KPA100.

On Mon, Jan 25, 2016 at 12:30 AM, Scott Manthe 
wrote:

> Hello to the list!
>
> I fired up my K3 tonight for the first time in months to try to work K5P
> and the VP8 expeditions. Thing seemed to be working fine until I tried
> working the VP8 on 30 meters. I noticed while sending that I didn't have
> much output on 30 meters. Investigating, I get output until I hit the
> threshold when the KPA100 kicks in. Full output until I got past 12 watts
> and them little or no output past that point. I seem to be getting full
> output on the other bands. Any guesses? It's vexing...
>
> 73,
> Scott N9AA
>
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[Elecraft] K3 No RF output

[Gregg W6IZT]

I am getting 0 RF output from my K3 on all bands regardless of the commanded
power level. Pressing the TX button results in -- where the SWR would
normally be displayed.

Any suggestions or ideas on how to resolve this issue are greatly
appreciated.

Thanks
Gregg w6izt

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Re: [Elecraft] K3 No RF output

[Rick Bates, WA6NHC]

It means TX Inh(ibit) has been activated.  Check your menu setting.

73,
Rick, WA6NHC

iPad = small keypad = typos = sorry ;-)

 On Nov 9, 2014, at 10:14 AM, Gregg W6IZT gregg.w6i...@gmail.com wrote:
 
 I am getting 0 RF output from my K3 on all bands regardless of the commanded
 power level. Pressing the TX button results in -- where the SWR would
 normally be displayed.
 
 Any suggestions or ideas on how to resolve this issue are greatly
 appreciated.
 
 Thanks
 Gregg w6izt
 
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Re: [Elecraft] K3 No RF output

[Ian - Ham]

Gregg, did you accidentally put your rig into test mode?  Are the antennas
connected?

Good luck finding the problem source.

73 de,

--Ian
Ian Kahn, KM4IK
Roswell, GA  EM74ua
km4ik@gmail.com
10-10 #74624, North Georgia Chapter #2038
K3# 281, P3 #688, KPA500 #1468

-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Gregg
W6IZT
Sent: Sunday, November 9, 2014 1:15 PM
To: elecraft@mailman.qth.net
Subject: [Elecraft] K3 No RF output

I am getting 0 RF output from my K3 on all bands regardless of the commanded
power level. Pressing the TX button results in -- where the SWR would
normally be displayed.

Any suggestions or ideas on how to resolve this issue are greatly
appreciated.

Thanks
Gregg w6izt

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Re: [Elecraft] K3 No RF output

[Gregg W6IZT]

Looks like I lost a PIN diode in the TR switch, I've ordered replacements.


Thanks to all who replied.

Gregg

-Original Message-
From: Ian - Ham [mailto:km4ik@gmail.com] 
Sent: Sunday, November 09, 2014 18:23 PM
To: 'Gregg W6IZT'; elecraft@mailman.qth.net
Subject: RE: [Elecraft] K3 No RF output

Gregg, did you accidentally put your rig into test mode?  Are the antennas
connected?

Good luck finding the problem source.

73 de,

--Ian
Ian Kahn, KM4IK
Roswell, GA  EM74ua
km4ik@gmail.com
10-10 #74624, North Georgia Chapter #2038 K3# 281, P3 #688, KPA500 #1468

-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Gregg
W6IZT
Sent: Sunday, November 9, 2014 1:15 PM
To: elecraft@mailman.qth.net
Subject: [Elecraft] K3 No RF output

I am getting 0 RF output from my K3 on all bands regardless of the commanded
power level. Pressing the TX button results in -- where the SWR would
normally be displayed.

Any suggestions or ideas on how to resolve this issue are greatly
appreciated.

Thanks
Gregg w6izt

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Re: [Elecraft] K3 no RF output

[Jim N7US]

Todd,

I experienced the same problem a couple of months ago.  I never noticed a
fault, but maybe it did it, and I didn't notice.

I emailed Gary (supp...@elecraft.com) and tried the EE INIT including
reloading previously saved configurations.  I ended up sending the radio
(S/N 3598) in.  Keith found an IC that wasn't properly soldered, but really
nothing else.  It never malfunctioned while there.  He did extended burn-in
sessions and installed a couple updates, including De-Oxit to the front
panel connections.  It's worked fine since then.  I was charged for an hour
of time, and I imagine he spent more time than that.

It was unsettling to not have conclusively determined the problem,
especially since it seemed to happen without warning, but it's been working
fine.

73, Jim N7US


-Original Message-
From: T Gahagan [mailto:wa7...@gmail.com] 


My K3 produces no RF in transmit at the 10 watt or 100 watt levels.  The
display shows two horizontal lines during transmit and shows 0.0 watts
output.  I have loaded older (4.47) firmware and then reloaded newer (4.48).
I have done a re-initialization and reloaded all parameters.  I removed the
KPA3 and reinstalled it.  No noticeable burned components were found.  I
believe the K3 did show, very briefly, a fault 6 and fault 7 but it was a
very brief flash in the display.  I thought SWR sensing diodes might have
been the cause so I replaced D36 and D37.  Any help would be appreciated.
Thanks

Todd




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Re: [Elecraft] K3 no RF output

[T Gahagan]

Thanks to you guys for the ideas.  The voltage does not vary when going to 
transmit mode.  It stays a constant 13.5 volts and the current drain stays 
at about 1.18 amps.  The horizontal lines are two lcd (end to end 
horizontal) lines that take the place of the frequency when I go to 
transmit.  As soon as I go back to receive the frequency returns.  These 
lines generally indicate that a device is not installed as I recall such as 
dvr3, kat3, etc.  My wife says we had some distant lightning while I was at 
the DX convention but all equipment was grounded.  I'm suspicious that 
static fried something.  Bypassing the KPA3 does not make any difference.  I 
do hear a side tone in CW but again, there is no RF being produced. 
Initially the problem was not being able to do 5 watt tx gain and the K3 
shut off on its own.  I was able to see power output while doing the 50 watt 
tx gain but as stated now there is no RF being produced at all.  Thanks 
again and it looks like a trip to Elecraft for the K3.

Todd

-Original Message- 
From: Jim N7US
Sent: Sunday, April 29, 2012 9:09 AM
To: 'Elecraft List'
Cc: 'Gary Surrency'
Subject: Re: [Elecraft] K3 no RF output

Todd,

I experienced the same problem a couple of months ago.  I never noticed a
fault, but maybe it did it, and I didn't notice.

I emailed Gary (supp...@elecraft.com) and tried the EE INIT including
reloading previously saved configurations.  I ended up sending the radio
(S/N 3598) in.  Keith found an IC that wasn't properly soldered, but really
nothing else.  It never malfunctioned while there.  He did extended burn-in
sessions and installed a couple updates, including De-Oxit to the front
panel connections.  It's worked fine since then.  I was charged for an hour
of time, and I imagine he spent more time than that.

It was unsettling to not have conclusively determined the problem,
especially since it seemed to happen without warning, but it's been working
fine.

73, Jim N7US


-Original Message-
From: T Gahagan [mailto:wa7...@gmail.com]


My K3 produces no RF in transmit at the 10 watt or 100 watt levels.  The
display shows two horizontal lines during transmit and shows 0.0 watts
output.  I have loaded older (4.47) firmware and then reloaded newer (4.48).
I have done a re-initialization and reloaded all parameters.  I removed the
KPA3 and reinstalled it.  No noticeable burned components were found.  I
believe the K3 did show, very briefly, a fault 6 and fault 7 but it was a
very brief flash in the display.  I thought SWR sensing diodes might have
been the cause so I replaced D36 and D37.  Any help would be appreciated.
Thanks

Todd




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