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Never a truer word said in jest, transistors being the fastest fuses on three legs..... Q1-3 & Q6 blown while protected by a F1A fuse, It does put things in perspective what a task it appears to be?

No, a more robust device will reequire a stronger driver device and likely a? revised DC feed.? ?The class E has fairly narrow bounds before it gets to a bad state.?? To protect it use a

So, in the midst of this discussion, if my finals blow is there a “drop in” replacement with similar characteristics but that will withstand considerably more abuse? 72, Charles - NK8O

Am 01.09.2018 um 20:07 schrieb Richard Harris via Groups.Io: Hi Richard, Thats a good idea. T1 should do it too with 3dB att - 2,5W. Using a 6db attenuator may cause the problem, that the tuner stops

That might confirm the saying that semiconductors blow fast in order to protect fuses from blowing... 73 Alan G4ZFQ

Len, I don't know why but the fuse settings do not seem to agree with Hans /g/QRPLabs/message/24845 73 alan G4ZFQ

The T1 is reported to tune with as little as 0.5 watts, and 2-5 watts recommended. Mine will tune even with repeated dashes. I haven’t run into problems with the QCX-20, but I am using an antenna

Am 01.09.2018 um 19:40 schrieb Alan de G1FXB via Groups.Io: It was a 1A fuse fast type. Supply voltage was at 15V via stepup converter fed from a 12V Pb akku. I assume its a PCB 3, it came already

Interesting! With a 3db attenuator installed in a rig that is putting out less than 5w, the power output drops 50%. And that is enough power to trigger an auto-tuner? Sent: Saturday, September 1, 2018

Hi Matthias, When tuning, the T1 auto-ATU may present an impedance to the QCX that causes excessive current to flow through the PA FETs or causes an excessive voltage across them? One solution is to

Hi Matthias, Sad to hear of the failure, 1/.??? out of interest what supply voltage and fuse value & was it (fast blow or time lag type) did you have? It's strange the number of QSX PA failures,

Checked out the antenna…here’s the first thing that hit me: The SWR is further broadened and lowered across 80m-10m with a high voltage capacitor on the primary of the transformer using band

I used my 20m QCX until yet on my station antenna without any problems for numerous QSOs among them one to PY1AX with over 9900 km. Yesterday I had to prepare the QCX for a fieldday next week. I

Hi Juddie, Thanks for this Interesting video! Do I understand that you bought the extra pieces at Bamatech? 73 Patrick F6GWE

Did my first one this afternoon using an Arduino to program it on the board.? The information for the settings including the fuses are here?/g/QRPLabs/files/AVR%20Programming and

Look up "The Old Tech Guy" on YouTube.? he builds several versions and it could save you a lot of trial and error.? Brady kd8zm Your comment was so vague I decided to go to that Youtoob collection.

But as the qrp-guys antenna is also a kit better check that one too ;) Have an antenna analyzer so that would be easy to do. John

Have a 50W dummy load so that is not a problem. Just have to find the time to investigate. John

Thought I would share a more detailed video of the QCX Enclosure to be able to use the S1 switch without having to take the enclosure apart to get to it.? This is for the times that you might forget

How did you pull that one off, Hans? The word about QRP Labs is definitely getting out! 73 de Jim KM5M