[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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