Dan things may be okay. It’s easy to jump to false conclusions. The capacitor peaking usually isn’t sharp, finding where it increases output tends to be good enough. Now for the nulling operation care

DK i have a plus here in the standard case, sure a QCX plus will fit into a standard QCX plus case. Yes the mini fits it’s case also but a bit more patience in assembly. Check out the pictures at the

Please look carefully Hans has already clarified the uncertain timeline to update the design, prototype and test it, then kit a couple thousand. These are unprecedented times, respect that this order

It's most likely loaded down by a faulty circuit, not necessarily a short. Maybe a device is installed backwards, check electrolytic caps and semiconductors. Curt

Yep random wires can have that kind of behavior. If you have no faults with a dummy load your rig is fine. Can you go any longer with your wire? A full 65 feet should match better on 40m and nicely on

#qcxmini

Mark Nice that qrpguys has that matching transformer as a kit, as I had the toroid so I just built one in an altoids tin. This design is well documented by experimenters on the web. How does it work?

#antenna #qcxp40

A few basics. A full size dipole can be fed via coax. Same for a vertical with radials. Many other antennas require matching at the base or tuning within the antenna. The enterprises mentioned are wor

#antenna #qcxp40

Darn spell checker. Work well under normal conditions ....

I have a couple thoughts. The qcx rigs workload nicely without agc under moral operating conditions. I have other rigs without agc, such as the pfr3. I added an interesting agc circuit that merely ins

I am trusting your ammeter. A mini could be less. But if you own an older qrp rigs like a sw40 it could be around 40 mA.

Definitely ingenious. An ordinary efhw has harmonic resonances, this one does not. Lower transmit harmonics and better immunity from transmitters in other bands. Maybe these virtues aren't needed ever

Check the current flow of both rigs. Heat shows up within each bs170 and it relies on convection. The new QCX heat sink expands the radiating surface it would be ideal except for the plastic package o

Bartel short answer is tuners only address part of the matter of mismatch, and they work best at the antenna feedpoint. A manual or auto tuner at your whips feed could help, but when placed at the rig

#antennatuner #ebay

Tom one more thing ... in the build instructions there are OPTIONS for how the brightness is arranged - and perhaps only one of the options is menu adjustable. go back and review how you did this - an

Ryan someone should enjoy your successful build amidst challenges of the first lot. meanwhile I wish you safety and warmth in some large snow events - to allow time to grasp CW. do confidently learn a

Stan I am thinking your technique is ballpark, but agreeing with the others that extreme accuracy takes more care. On lower bands atmospheric noise and man-made noise tend to be higher than receiver n

#qdx

Hard to quantify a rate. If a builder makes an assembly error in audio chain it can be a decent effort to find. Parts including display are high quality. It is not hard to zap controller and pll chips

Rick You have me puzzled. Cw filter is natural part of the qcx design, it is always enabled and is not adjustable. It works well. Curt

Brent Good questions. I suggest reading about differences of class A versus other types of amplifiers. Second, note that amplifiers have limits to their linearity, and the best produce some harmonics.

Honestly parts are scarce, and when the next batch goes on sale they may be sold in an hour or less. There is no shortcut, you must be on line when they go on sale. Watch here for the info. Eventually

#chat-notice