After building my kit I very quickly put it on Ft8 to check it out. It received apparently ok. With pskrporter I saw my transmissions registered all over north America. I then plugged in a head set and heard Nothing. Tried a second headset still nothing. Switched the CW keyer to practice mode, no audio. If I use a cw key and put a power meter on when I key the paddle I get about 4 watts out.

There is a click when I power up and power down, but when on receive or during CW practice mode there is just no audio what so ever.?

I've looked over the board with a loupe at least 20 times. My soldering isn't professional but I don't see any missing smd parts, broken smd parts, or really bad solder joints. I've attacked an image incase someone knows an obvious location to look.?

Any help in where I could look next for trouble shooting would be greatly appreciated.?

73, Don KC9ZMY

The pin farthest from the edge of the board on X401 looks like it isn't completely soldered. Try reflowing it.
--
Colin - K6JTH?

I have lost audio several times on my QMX.?
A Hardware reset via the menu brings it back?

Well I have tried all the suggestions, quadruple checked the solder joints. There is NO sound other then the initial click at power up. It will work fine on Ft8. With FLdigi I can decode CW. The Device successfully Will transmit CW and decode CW both with the Key and on the air. Just nothing out of the head phone jack. I purchased another kit and am going to build it and then compare and contrast the two. If anyone has any other suggestions I'd love to try them.?

? Don..?

?Don

If you would like to try signal tracing
Here is a? very nice PC soundcard oscilloscope for win XP and above
As you know surface mount components are packed tight
Be careful probing
I use a hat pin, small sharp point so not to skip off component es short to another,? plastic knob so personal contact does not introduce noise or 60 Hz junk

https://www.zeitnitz.eu/scope_en

It is also dual channel with a spectrum analyzer and sweep generator? And Free

72 73
John
N3AAZ

Check that there is no short in this circled location.? Also, this IC is a little skewed to the right, make sure all of its pins are nicely connected to the pads.
This is the most likely area of concern giving your symptoms. Good luck!
73
Bruce
KG8IW

After looking again, it looks like the pin on the far left may not be hitting the pad at all --?
Bruce

possibly either a duff jack socket or duff phones..

I overheated my headphone jack on the initial assembly. I swapped it with the PTT jack to get up and running. It's not uncommon, these little jacks can't handle much heat.

Don,
the condition of your QMX reflects exactly what I'm getting.? I've built several qrp-labs kids but never had a sound issue. I just wondering if we are unlucky and have a duff board. on a side issue my BNC connector was so stiff that today when I unplugged the coax cable it pulled the innards of the board bnc. connector with it breaking of the pin making it basically non repairable. I'm gonna replace it with an ama connector as I believe Hans has provided for both types of connectors.?

Paul DJ0CU G4ADF?

开云体育

Billy, I believe what Paul was referring to is an SMA connector.

开云体育

I meant sma of course, I've not see a method too edit sent text to update it.

?""I've not see a method too edit sent text to update it"" ... Paul

On far right click three bars 'More'
then 'Delete'
confirm click 'Yes'
then re input your comment?

72 73
John
N3AAZ

thanks John.

72 73 de Paul DJ0CU G4ADF?

Bruce:
? ?Thank you!!!! I reflowed the pins on IC401 and suddenly I have sound! It seems to be working just fine now..... :)

? ? Thanks to everyone that had suggestions.?

? ? ?Donald L. Gover