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This sounds similar to the issue I had - documented in this thread ( /g/QRPLabs/topic/107821803 ).? I spent time working though options with Hans and in the end he sent me a new main

Assembled my QMX+ and it's working.? I had a couple of issues related to enameled wire not making good connections that were resolved.? I know it's working, I've made contacts on several bands

Hi Stan, thanks for the speedy reply. Appreciate your insight. I am getting continuity from C403-Pin 10 and from the "15-turn" tap of L401a to Pin 6 of IC402. Seems like that's good, right? I had

Yes you need a dummy load for calibration and yes with bit of practice you can use the built in swr meter for antenna tuning.

A new chat has been created: Hello, i'm sorry for asking newbie-easy questions. Do i need dummy load, perform any possible calibrations if will receive already assembled and tested QMX+? Can i use

Hi Alex, This is an interesting one.? For more context, it would be helpful if you posted RF sweep for 20m, and LPF sweeps for 20m, 17m, and 15m. The bandpass filters (RF sweeps) follow the LPFs in

Hi all, I've just finished building a QCX Mini (Rev 3; software version 1.09a; 30-meter version). When I powered it up for the first time, I got the intro screen followed by a 160-meter frequency.

150-200mA is fine for QMX without firmware, in firmware update mode presenting USB drive.? Assuming the current draw happened after you pressed the power-on button. If display light comes on without

I'm have not seen this behavior before, so no, it is not a well-known issue. Perhaps RFI into your QMX or computer from imbalanced antenna? Try adding common-mode choke to your feedline, and/or

One question: which version of kit did you have?? v1, v2, v3, v4? There are several different possibilities for a burned Q109. All of them come from a short on Vdd or one of its control lines

Tony, I have added the results for 9V: 10V 9V Band PWR-W I-mA PWR-W I-mA 160 6.55 1150 5.19 1047 80 5.35 928 4.24 851 60 4.99 925 3.92 859 40 5.73 975 4.49 898 30 5.68

Hello Wilson, I suggest you first remove both power supply boards and verify that there are no shorts on the Vcc and Vdd lines.? The pin assignments from the bottom view of the QMX board are in a

The 3.3v SMPS provides power for the STM32 controller. While you are waiting for new SMPS boards, I would check resistance between VDD and ground per to rule out a controller short, per the wiki.

I received a QMX and built it.? ?I've built a number of QRP kits all successfully, but not so for this little guy.? I attempted to powered up using a regulated power supply at 7v and 250 mA but

This is a little off topic but the charges to deliver my natural gas is almost twice what my actual gas bill is each month. It's happening everywhere.

Also, there's a rule that the envelope must be flexible to get the low rate. In the case of international USPS mail, it is very punitive. If the envelope is not flexible, it is price the same as a

La Réunion island -- Jean-Jacques - F5IJO FISTS#17008 LICW#5902

Congrats! Where IS FR8UA? Dan

Hi Roelof, Interesting result with 2x3 BS170s. What is your 2x2 output? Something I have been thinking to try is stacking a second ACT08 on top of the existing one. My simulations seem to show that

Hello all, Last week I finished the build of a rev1 QMX+. No problems were encountered and it worked fine on powering up. During the build, I have measured the frequency response of the low pass