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Hi Stan, the copper wire seems to me to come from above and then go to be soldered at the bottom. Breaking the wire is compatible with breaking the edge, in that upper area of the solenoid the

I have also seen this behavior, which is due to the firmware 'automatically' selecting compatible frequency/filter combinations. Make sure to check out the CW filter description in the Operation

Wow - I've never heard that one before.? Just make very sure it is not moving because of a loose wire connection; that could cause a failure later on.

You are correct, that 160m LPF sweep looks fine. So the problem is most likely in the input side of the bandpass filter for 160m.? These are the connections I referred to in my prior post. Since all

I have you on the list. Please note that there is not yet a timeframe for a possible group buy - we are continuing to test v2 ABS Stan KC7XE

All communications to Hans regarding specific orders/problems need to be done via the support system at qrp-labs.com, if I understand correctly. No, the QMX definitely should not have failed after a

Wow, that's bad luck. The measurement of the antenna/ground is as expected - it is a DC short, but RF passes fine. The measurements I would take first are some voltage and current measurements.? The

Thanks for having a look Stan and for the suggestions and recommendations. Yes, noted the preinstalled caps. I will certainly take a look at the suggested reading material and have another good look

Hi Steve, Interesting read, thanks. Hopefully I can find a resolution..... I think last time we spoke I was using the QMX..

The coil is fine as-is.? The chipped top does not affect functionality. If the diode is working, there is no need to change it.? But it is a common 1N4148, so easy to find and replace if needed.

Ok, you certainly have some sort of issue with the bias current supply. It should be a very constant 30mA. This could definitely cause a pulsing on tx as it wildly changes values. All of the other

Have a look at this thread re bias current fluctuation: ?/g/QRPLabs/topic/107821803#msg127488

a) no the direction doesn't matter, but I always do mine symmetrically b) I use my finger to press the winding around the ends of the core, bending it so the wire sits right up against the ferrite

Does the winding direction/handedness in each side of the T507 binocular core transformer have to be the same.? Hans stated in his 2023 Evolution in Radio Design paper (pg 21) that: "... Here we use

I note that the Bias current fluctuates wildly from -11mA to 62mA

Thanks for replying Stan. 1) Tried adjusting the keyed speed. Pulse remained the same. I had the same thought re cw mode as I got caught with that on the QMX. 2) The pulsing remains without any

Michigan QRP Club I had a CW practice session on May 20. I worked three stations. Conditions were poor with high noise. I started on 40 meters. I switched to 20 meters but that was not any better.

Hello Matt I can implement that yes. No problem. I'll add it to my list. QMX has 1, 2 or 3 Virtual COM Serial ports according to how you configure it in the System configurarion menu. Currently no

The wiki page QMX QMX_plus SSB Calibration and Predistortion ( /g/QRPLabs/wiki/39506/222685 ) has been updated by Stan Dye <standye@...>. *Reason:* Added new intro material,

The only things lost by not doing calibration are: 1) the phase pre-distortion compensation doesn't do anything (as if you had turned it off) 2) the sideband phase/amplitude synchronization is set to