KX3 Receive Audio & Control Knob Problems

[Robie Elms-2]

All,

I have acquired a used KX3 (serial number between 4000 and 5000, uC
firmware 0.150, dsp firmware 01.21) and I am checking it out.  The problem
I have encountered is no RX audio:

1. The AF/RF-SQL knob does not change either RF or AF gain.  When I TAP the
knob I momentarily see 1 in the OFS/B window then returns to VFO B.
Rotating the knob does nothing.  A second tap shows RF --58 momentarily and
then returns to VFO B,

2. WIth the MODE set to USB and tuning to 14074 (lots of loud FT8 stations
on this freq) I see S meter action.

3. When I send CW I hear a side tone from the headphone and the speaker
when the headphone is unplugged.

4. When I HOLD the AF/RF-SQL knob and go to MON the OFS/B window show 5 and
rotating the AF/RF-SQL knob does not change the number.

5. The PBT I/II knob appears to function properly.

6. With MODE set to USB rotating the Keyer/Mic knob does not produce any
indication of a change in MIC gain in the OFS/B window.  When in the CW
mode rotating the know does not change keyer speed (remains at 18 WPM),

7. When I HOLD the KEYER/MIC knob to adjust power 5.0W is displayed in the
OFS/B window.  However rotating the knob does not change the power level.

8. The KX3 transmits CW properly at 5 W output.

9. I do not yet have a USB/Serial interface to possibly reload firmware.

I'm looking for suggestions for next troubleshooting steps.


Robie - AJ4F
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[Don Wilhelm]

Robie,

Either you have a KX3 problem or you are not tapping the knobs correctly.

Do you have the KX3 manual?  If not, download it from the Elecraft
website and read through it.  If you need more comprehensive and
detailed information along with exercises, you can order the Fred Cady
(SK) manual from Elecraft.

For firmware updates, you will need the KXUSB cable which you can order
from Elecraft.
As an alternative if you have an RS-232 port on your computer or you
have a USB to RS-232 adapter, you can build the KXSER cable - the
schematic is in the Elecraft XG3 manual near the end.

You will also need to download the KX3 Utility from the Elecraft website
and install it on your computer.

73,
Don W3FPR

On 6/1/2019 4:43 PM, Robie Elms wrote:

> All,
>
> I have acquired a used KX3 (serial number between 4000 and 5000, uC
> firmware 0.150, dsp firmware 01.21) and I am checking it out.  The problem
> I have encountered is no RX audio:
>
> 1. The AF/RF-SQL knob does not change either RF or AF gain.  When I TAP the
> knob I momentarily see 1 in the OFS/B window then returns to VFO B.
> Rotating the knob does nothing.  A second tap shows RF --58 momentarily and
> then returns to VFO B,
>
> 2. WIth the MODE set to USB and tuning to 14074 (lots of loud FT8 stations
> on this freq) I see S meter action.
>
> 3. When I send CW I hear a side tone from the headphone and the speaker
> when the headphone is unplugged.
>
> 4. When I HOLD the AF/RF-SQL knob and go to MON the OFS/B window show 5 and
> rotating the AF/RF-SQL knob does not change the number.
>
> 5. The PBT I/II knob appears to function properly.
>
> 6. With MODE set to USB rotating the Keyer/Mic knob does not produce any
> indication of a change in MIC gain in the OFS/B window.  When in the CW
> mode rotating the know does not change keyer speed (remains at 18 WPM),
>
> 7. When I HOLD the KEYER/MIC knob to adjust power 5.0W is displayed in the
> OFS/B window.  However rotating the knob does not change the power level.
>
> 8. The KX3 transmits CW properly at 5 W output.
>
> 9. I do not yet have a USB/Serial interface to possibly reload firmware.
>
> I'm looking for suggestions for next troubleshooting steps.
>
>
> Robie - AJ4F
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>

______________________________________________________________
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Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html