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Most of the noise produced by these converters is below 5 MHz. Very little at all is produced above 7 MHz. https://ae5x.blogspot.com/2020/05/cheap-dc-dc-converter-for-qrp-with.html -- John AE5X

Evan: Will this cause additional interference due to the use of such buck/boost converter? I like this solution but I'm concerned about the additional noise and birdies when RX. I would be grateful

Congratulations Rick. Mike Krieger [email protected]> wrote:

The last screen shot! 73 Azgael

Finally success following the power pad did help. Surprisingly enough there seams to be a broken via or track connecting source of q102 to ic101 to input. ?Now I am a bit concerned with other issues

Good luck with your QCX+. You do need good eyesight and a magnifying glass to identify the parts. I built my QMX and QMX+ at eighty. They are great kits. I have made several SSB contacts with good

Pierre, I have found that using a buck/boost converter when connected to batteries is better.? That allows constant voltage to the QMX until the batteries can not supply

Hello Martin, If you are on a Windows version, have you tried using the "listen" feature on the sound system?? How you get to it is dependent on your version of Windows.? For Windows 11, it is

New broken QMX+, need repairhelp in Sweden. Regards Roger SM7RYR Contact: sm7ryr@...

When I have the QMX+ set up for WSJT-X I have to select the QMX for Audio in and out.? Now I don't have the sound from the Pc any more. Is there a way to have both? -- Martin DK3UW

I used a Baofeng microphone in which I put a new 50 ohm, 1W speaker and a new microphone capsule. I am surprised how good and loud it sounds in the new speaker without any amplifier. I removed the

Chris, I wish you would not use these, obscure to me, acronyms:-) But you did post " one way to check the power connectors is to use a meter in diode mode with the power reversed so I can see the

After months, even years of thinking I eventually ordered another QRP Labs kit today: a QCX+. I had previously built a QDX Hi Band and am satisfied with it. I followed closely the development of the

I don't buy this, sounds like FUD to me. > > > My meter in diode mode generates 3.9V and, crucially 1.5mA.? This into a circuit that's protected from reverse voltage by the TVS diode, Q103 and

Hi Gary, Mine is the same. I can't get it to complete on any band. I have spent several hours messing with band edge and center frequencies. It didn't seem to make any difference at all. Resetting

Also inspect carefully the interconnect of the LIN_REG_EN signal fromthe smps card to the main board, ensuring nothing there is pulling it down.

I think the issue is that 12V pushes the voltage rating on the BS170's, and the increased current at 9V for the same power, ends up pushing the current rating of the parts. Paul -- AI7JR

I just finished playing in the CQ World Wide SSB contest! My setup included the QMX+ (firmware 1_01_003) and a 3-el yagi at 15 metres above ground. The QMX+ performed beautifully. I made 118 contacts

That was it!!! Do you have any spare diodes to replace it with? I don't have any and I don't want to run it without. [email protected]> wrote:

On Sun, Mar 30, 2025 at 09:00 PM, KK4ITX John wrote: I do not know why the components after said toroid get excited if less than 12v is used if built for 9v….. I am basically a math guy. Because