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Just wondering ... Certainly odd behavior.? Do the PTT and TX indicator dots under the VFO letter on the LCD display also disappear when the TX stutters and/or stops? Does the unit have the same

Hi I've redrawn the system schematic to reflect using the HL2 0~17dBm RF output, please see below And in case the quality is insufficient, there is also a .PDF attached. Could I please ask that you

I have tried powering it from a Talent Cell battery pack & from the same small switchmode supply that I have been using for months, as well as a 5 Amp bench supply - I don't think it is a power

Not sure whether anyone else has reported this, but when I play message 2 on my QMX+ it also immediately plays Message 1. ————————- Jim N7RCS Palm Bay, FL

My QMX+ has the same issue. 1_00_019 works fine. 1_00_020 has unreadable display. The 1_00_020 release is the first one to use all 8 address bits on the LCD. All previous revisions use only 4 of them.

Don, usually yes, but the SWR figure from the VNA looks similar to the figure from the QMX, only shifted by some 100 kHz. 73, Ludwig

Here is my I/Q scan on a QMX HB. A far cry from how it's supposed to look. So I guess something is not quite right. 73, Andreas, K6AKW

When pressing the L/H encoder at the start of the 2 minute . Instead of starting 0 seconds it starts at 8 seconds. Using the latest firmware. Philip G7JUR

Dirk There was a small group of us here who had a similar problem with the PCM1804 a few weeks ago. The common symptom was a low resistance to ground from either Vdd or Vcc in the order of a few

Hi Allison I rigged up a 50ohm BNC dummy load and connected it to the DSO, (Siglent SDS1102CML+ 100MHz Dual channel oscilloscope), and life is suddenly V good, see table below !!! Fmeasure= 5398.5

I've taken a look at the HL2 schematics, RFFrontend.sch and PA.sch - https://github.com/softerhardware/Hermes-Lite2/blob/master/hardware/hl/hermeslite.pdf and the drive to the 17dBm connector, "RF1",

Hi Steve That would mean voiding the warranty, and I'd rather not risk damaging GBP 1,000+ kit if I can do a solid solution with QRPLabs ultra-stable 10W Linear Amp BTW, do U know where I can get my

I've already got the HL2, the EU1SW is basically an HL2 with a 20W Linear in an enclosure for about USD400 more than what I paid for the HL2 itself. The QRPLabs 10W linear is about USD70 delivered inc

Still waiting for the replacement PCM1804, but the Chipquik arrived. What a great stuff, highly recommended. Desoldering within 2 minutes and no issues.

Thank You Allison, I was beginning to feel like Alice in Wonderland !! The 17dBm output is very attractive, but I'm not sure if it's variable, eg if the "drive control" in the various SDR s/w can

To be precise for transmitting WSPR on 20m: the actual TX frequency must be inside the mentioned block for WSPR: 20m: 14.097000 – 14.097200 MHz Now if we use the Beacon mode of a QMX machine then

Yes, exactly. The toroids are the ones to worry about. The 47 uH molded inductors suffer in a different way. They are a bit brittle and are subject to physical damage. That too can shut down an

Thanks John! I'll start with those. Just to be clear, when you're talking about checking the inductor leads first, you mean the hand-wound toroids (L2-L4, L6, L8, L10)? As opposed to the L1, L5, L7

Leigh, Solder joints can behave like this. Imagine surfaces pulling apart as they cool and shrink. With focus on the 20m LPF, I suggest checking the inductor leads first. A poor joint that is the

So grateful for Jeffrey Moore, W1NC, who can figure out where we went wrong with our QRP Labs kits. Admittedly I do not quite have the tech chops, in spite of my enthusiasm for kit building. But