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Number of turns are exactly as per the assembly manual. I spread out the turns a bit more evenly but this yielded only very minor improvements. TX power on 15m went from 1.9W to 2.0W (@12V). Anyway,

Thank you Hans.? I knew that you would increase my level of understanding.? ?The student defers to the master,? again, lol.? Can't wait to get mine on the air.? 72, Doug

Hi Doug > That was cya for us. I am interested in hearing why you don't include Originally I believed the BS170s in QDX/QMX would see less drain voltage anyway than in a QCX (with it's three

I find with W11 if I plug the USB lead in to the radio and computer and then turn on the QMX it will be Ok. ?Otherwise as you say W11 usually reports a malfunction.

That was cya for us.? I am interested in hearing why you don't? include one.? Is there a reason?

Here is my zener protection test video: https://youtu.be/7hUmkE84kfA?si=bZolSWrp5Nk2fyKE I use 47V 1W zeners on my QDX and QMX. No issues no mosfet smoke! -- 73, Barb

Yes we use the 2.5mm spaced 50V rated Vishay NP0/C0G from Digikey. The price for US domestic shipping is $4.99. 73 Hans G0UPL http://qrp-labs.com https://buymeacoffee.com/g0upl wrote:

Hi Larry, could you provide more details about this circuit? I tried it but it didn't work. I understand the on/key-down state here. But what about the off/key-up state? IIUC, when the rig is in

No replies yet on the specs for this capacitor.? This is in a low pass filter, so it will see some voltage. Based on the markings, this is a Vishay/BC capacitor. On Digikey, I see a 50V 5% NPO

I’ve successfully updated my qmx software, but WSJTX does not find the qmx audio files for input and output. When I plug in the USB-C cable windows says USB device not recognized. I have QMX in

The leads are likely Kovar? or Alloy 42?, which are used in semiconductor packaging due to their low coefficient of thermal expansion and the ability to be wet by glass seals, which makes them

Alison, Bruce, Thanks for the info. It’s much as I feared. I may try the 5W PA (now a retired kit) with a RD15VHF1 which I already have. Thanks again for saving me a lot of wasted time, which I

NO and no. The transformers are completely unsuitable for 2M.? For 2M I've had best result using coaxial Transmission lines of the correct impedance (not 50 ohm!) The IRF510s are untried at 2M.?

They *are* VHF FETS but the transformers (cores etc )will be way out of their comfort zone, the gain well down from HF levels etc. The PCB *might* be a basis for your own ?VHF design but there will

Hi all, I realise that this is way out of it’s specification, but does anyone have any experience of using this amplifier on 2m? I’m not expecting 50W but will it work at

I bought the Hakko FX888D before starting on these kits. ?Also, a spool of Kester .015” lead core solder. ?When I read Jeff Moore’s suggestion sheet it stated a recommendation of 790 deg F.

In preparation for building my own mid-band QMX, I was rewatching Hans' "52 tips for building your QMX successfully!" video. Interestingly, if you go to the 30 second point in the video and look at

Danny Great amp. Have been using mine for 15yrs with FLEX1500, now replaced with QMX HB. There is a mod to set the input power to 5W or 10W. With the QMX (9V) running at 8V there is enough drive to

Hi Doug You must have been worried about it, your manual says: "Operating or testing into a bad SWR or no antenna will permanently damage the three power amplifier BS170's. Be careful..." 73 Hans

Hello everyone. Thank you very much for all your help and answers. The crucial tip was the soldering tip. I have made many kits from Hans and his team with one and the same soldering tip so far