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Mine is doing the same thing. It just started doing that after it locked up for no reason. I thought maybe it was due to me leaving it on 24/7 for 2 weeks.

Sounds exactly like my QMX .... Hate to say it, but sounds like the PCM1804 to me. Conard, WS4S ________________________________ Sent: Tuesday, December 3, 2024 8:15 PM To: [email protected]

Check and double check the connectors and their respective solder joints to the two power boards. Use flux when reflowing the solder. Make sure there are no solder bridges and that the boards are

Ed, Will you be doing another one during December? —Mike KC1VBX

Just finished building a QMX. I followed every assembly step with as much care as possible. Performed an extensive visual inspection with magnifier before applying power.? Applied power...no smoke.

I have done some more tests after trying to make sure as many solder joints are ok; used flux when reflowing. Then, with a 12V SLA and buck converter/regulator set to 11.3V and listening to audio on a

Just adding a shot of the QMX+ in service. I should have the new part tomorrow so I will be able to finish the build.

Dan, I have attached a screenshot of the power bank and power cable that I have been using . The same company also makes a 12V version of the power cable if your radio has a transformer wound for that

Peter Thanks - I guess I should have changed the subject line. But I am trying to find an ATU-10 kit, the QRP version to use with a QMX+ 73 Paul w2eck

Thank you Stan. Yes, I touched ALL of my solder joints. I'll go back and review L401, T401, and the LPFs though. I'll also take a picture of the board (top and bottom) and zoom in to look for anything

Ok - I'm glad that helped so much.? Many have found that their 'good' solder joints aren't so good, so you're definitely not alone. The scans do look much better, but you do still have problems. My

First of all, I want to thank all of you that responded to my post. I can follow directions, but I am definitely out of my element when it comes to understanding and troubleshooting this project (as

Hi Paul Amazon sell the kit, try this:

And the exact noise bandwidth varies from the nominal IF filter 3dB bandwidths, and with the shape of the filter.? You can watch the instrument (higher-end one anyway) making these measurements when

Having trouble finding a source for the kit. All seem to be already assembled, Any know of a kit source? 73 Paul w2eck

Dan, The transformer in my transceivers has been wound for a 9V input. I use a INIU 2000 mah Power Bank in combination with the DSD TECH Type C PD ?to DC power cable at 9V output. The cable comes

Yes I was discussing the part soldered to the PCB. But, to be honest I am now at a loss as to the problem? I removed the socket from the printed circuit board and retested it with nothing connected to

I restored the original connections in my QMX+ so that the LPFs are once again in the RX path. It made things generally worse, by a lot in some cases. The artefacts were due to the QLG3 which I have

I posted a short video of how the QMX+compares with the KX2 and FT-891 in terms of receiver sensitivity on 20m: https://ae5x.blogspot.com/2024/12/receiver-sensitivity-of-qrp-labs-qmx-is.html On other

I'm not surprised at all by this difference, especially noting that these tested values are from QMX/QMX+ units that were sent to Jeff because the original kit assembler did not have the skill to