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Hi. Last evening I finished assembling my QMX and loaded the firmware. Today I’ll see how she performs. Having built the QCX years ago, I keep searching for the alignment instructions but since

Hi Hans, Thanks again for the great QRP Labs products. You're right about me getting my wires crossed somewhat. I was thinking about the following QMX issue when I made the comment:

Hi Steve, This is not the typical cpu VDD short to ground behavior. ?Check with a DVM in continuity mode for VDD shorted to ground on the main board without any other boards plugged into it. ?You

I am wondering if it is possible to transmit modulated CW using FLDIGI with the QDX ? Would this generate a clean enough signal to be understood over the air? Would it put an undue load on the QDX

Hi, you can also test it with the Diode function if your AVO has it which operate at a higher voltage. But the simplest test if a GND PTT line at the tip of connector is working is if you - enable

Hi William, The product that AJ8S suggests is a *Buck Boost* converter.? ?It converts the input power and current to the set voltage output as long as it is within the range of the device.? It

To DC. If you look at the schematic you see input and output has transformers. DC resistance very low. But reactance to RF is not low. 73 Alan G4ZFQ

Hi Jim. I had made the same assumption as you when I first tested my QMX PTT out after firmware 017 was released and I installed the jumper as you have done. But Hans explained that the circuit in

I measure the ohms between *Ground and In* as well as *Ground and Out*.? To my surprize it is around 0.3 ohms - basically a dead short.? What resistance would be expected here.? The amp seems to

Hi Ludwig Frequency calibration hasn't been implemented yet. It's not high priority because QMX has a high performance 25 MHz TCXO as standard, for it's frequency reference. Unlike QCX where it's an

Or it might be no issue at all. The volume level on digital is just much higher than when on CW. Perhaps something I need to add an adjustment for. So this could be NO issue at all, just an

Hi Quentin This is a WSJT-X feature called "Flatten", which is intended to compensate for the imperfect passband of some crystal filters etc (with suitable calibration). On QMX the passband is

Hi Howard You're mixing up with QMX. QDX doesn't have switching regulators. There isn't any such issue on QDX... 73 Hans G0UPL http://qrp-labs.com https://buymeacoffee.com/g0upl

But unfortunately, there's no SWR sensing in the QDX... 73, Paul -- AI7JR -- Paul -- AI7JR

Hi, I build my QMX 1 week ago. The process run well and I'm able to use it. However, I got some weird noise around 150Hz on WSJTX, as you can see in my screenshot. I trying both magnetic loop

Hi Chris - thanks for the reply and the schematic. However, I'm not understanding why, if I want to verify that QMX is actually grounding the tip of the plug when I transmit, can't I simply put my

Has anyone mounted the 10-watt linear amplifier in the case intended for the 50-watt amp? Justin N2TOH

Please disregard above. Jim, AJ8S, has suggested a product that my resolve my quandary. ..if I am all wet of this, advice appreciated. -- William, k6whp -------------------- "Cheer up, things could

Sorry to hijack this thread, but I built my high band QDX to run off off 12VDC but realize that my gel cells can carry an initial charge of as high as 13.93 VDC. After treading the admonitions, I am

Interesting thought. I have not seen it discussed before here. Hans could switch to a 2 color LED or add a second LED to indicate when SWR protection has tripped (or add yet another blink pattern).