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Let me be clear - I'm not upset at all about how long it may take to get my QMX.? I'm just curious is all and I know Hans is working hard to meet the huge demand.? During the 8 month wait for my K4

I would run at 7 volts and cut the 12v trace to Q6. Then wire from the 12v line at JP27 to Q6 and insert a string of diodes to drop the voltage. This lowers the voltage to the finals. By adding more

I have not looked at my QCX+ but it seems easy enough to cut a trace and supply a lower voltage to the amplifier - a 78xx voltage rectifier or zener diode inserted in the amplifier supply line

Thanks to all that have replied, I have to throw my hands in the air and do a Sergeant Schultz on it and claim to 'know nothing'. That is to say that, at best, I have an only basic hold on the cl. I

It looks like there is enough connection left to make a pad. Put some liquid solder there and heat it without a component. Then check continuity of the traces. You may have to scrape a little resist

I too would love to see how this mod would be done in order to use qcx+ in wspr at less than 1 watt. But the engineering is not in my wheel house. I have seen this idea requested in several threads

Datapoint: When I initially powered the qmx I got on the order of 200mA when pressing the left encoder. Good news, sorta, L202 is in line to power the cpu, so, once you replace it, fingers crossed,

Does running a 12Vdc QDX at 9 Volts provide a sufficient safety margin (for finals) while tuning up with an auto tuner if the SWR does NOT exceed 2:1 DURING TUNING? I use a 3db attenuator pad so my

True, true. 73 Hans G0UPL http://qrp-labs.com https://www.buymeacoffee.com/g0upl wrote:

Question: ?What effect will running a QDX wired for 12V on 9V. ?Suspect it will only lower the output power…true?

Hi David, you are right, however the thing is, that it doesn't matter as long as the numbes of turns are correct. Where one turn counts when a wire goes thru the toroid. 73 Bojan S53DZ

Looking at the pictures in the QDX build manual (Rev 1.8f) am I correct? While looking at the picture instruction for L12 on page 24 which is labelled "Step 1" (red font), and comparing that to

I would still use an SWR meter for my QDX’s even with a resonant antenna, not the least because I use them in a portable setup. You never know if anything fails and then a SWR-meter will tell. I got

The 40 meter rig has been sold. Still have the 30, 20, and 17 meter radios available. -- Jim / K7TXA Eagle, ID SKCC 10447 BUG 301

Also interested. I have a smoked QDX. The 5 V regulator is screaming hot, with only something like 2.5 V at the output. After some digging it turns out that it's the 3.3 V regulator output is shorted

Some time ago, I purchased a set of Si5351 breakout boards, despite some reviews complaining that the chips did not work.? I found that some of the chips worked properly, and others appeared to have

I have been trying to do some more troubleshooting on my own, still haven’t found the issue. I put an ammeter in series and attempted to power up the QMX. While pressing the left encoder, minimal

It is a misconception to think that just because an antenna is without Reactance that it should also be a decent match to a 50Ohm transmission line. Dave

I have been powering my RPi400 with the USB-C output of this display: https://www.amazon.com/gp/product/B07NNXH2SS It hasn't hiccupped even when doing a massive update of a new installation, which had

Sverre, if you were to use a resonant antenna, surely you wouldn't need an SWR meter?