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The attenuation should be the same at all frequencies.? Some taps I've encountered are inconsistent with frequency. So long as no one complains and you make a reasonable attempt to comply there

Since the second harmonic is very dependent on the symmetry of the PA signal the second harmonic will vary from unit to unit and may vary with supply voltage.

Connect the radio and copy the file to the radio

Paul, Thank you for your help. I looked over the soldering joints with a combination of a magnifier and a jewler's loupe before powering it up (and many times since). The qmx is no longer connecting

OK Doug. Just checking, as the term "active antenna" does carry a specific meaning. JZ KJ4A

Jay, one thing that made it less objectionable for me was to set Sidetone volume to "45" and "sidetone abs/rel" to Relative. 73 .. .Ron

John, it's just an end fed half wave. More accurately, active because it has signals on it. If I switch it to the dummy load, no buzz.Doug WX7JSent from my T-Mobile 5G Device

Hi Julian, first of all good to hear you could solve your software problem. Now to the hardware. I looked at your Video and first some warning (also others might seeing the video): I see you have

I decided that after my great success as a newly minted CW op with my trusty QCX-Mini that I would dust off my QCX 40M and the first order of business wa to upgrade the firmware from 1.01 to 1.09. I'm

Anders, Whether an LPF or a BPF (the Z-Match is a BPF), it does not matter.? As long as what goes to the antenna is within specification, you should be okay. 73 Evan AC9TU

"I thought that they would be downloaded after I started the firmware update by pressing the rotary encoder after I had attached the 12v power supply." No, the process is in no way automatic. *Read

Mike, Thank you. I have downloaded the link that was in your reply. I have extracted it. What should I do at this point? I can only open it with word and it looks like an encrypted file. My pc does

Doug, You said you connected an active antenna. Is that correct? What model? Active antennas have a built in amplifier to enhance reception, but it probably would not survive if the TX was

Thanks Mathias (and group), I verified that the advanced features were already enabled. Also verified that the extra diode mod was installed in my factory built QMX As I said in my other email, the

I don't know about high quality 40dB attenuator, but I quickly built the AE6PM power tap and additionally an attenuator of 20dB (68/270/68ohm). Total 60dB. And then I ran my 3 Watts through that

Another question for the group:I have a qcx mini that I added AGC to and worked fine for a while. Now whenever I connect the active antenna I get some signals but also a loud buzzing sound too. (it's

download the firmware <https://qrp-labs.com/images/qmx/firmware/1_00_014.zip>, then unzip the zip file, then copy the 1_00_014.QMX file to the radio -mike/w1mt

Paul, Do you download the firmware file separately to the computer. I thought that they would be downloaded after I started the firmware update by pressing the rotary encoder after I had attached the

Just noticed that, while removing the power supply boards from the surrounding "stuff", I managed to do a tiny bit of damage. The board in question is the one with two of the BA6D1R MOSFETs and is

Coupling loop probably works better (more pick up ) at higher frequencies but definitely not flat So accurate spectrum measurements are impossible Use a high quality 40dB attenuator that can handle