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Evan What zener do you recommend?

Hi Giuseppe, Thanks for the information about the T37-6 yellow toroid. I seem to remember reading something about that while researching toroids. I'm only getting about 1/2 watt RF power out using the

Hello Stefan, In all honesty, I don't think there's any noticeable improvement... or my ears don't hear it, at least. I did the mod because the pacient was already on the table for the recommended

Hi Adrian, Lun, Jim & Paul, I'm fascinated by your efforts to optimize the sweeps, however, I wonder, whether this will really have a recognizable effect in day-to-day operation. From what I got now

Hi folks, now that I got my filter sweeps fine after replacing Q508, I want to do the Diode mod. However, I have no 1N4148 lying around. What I got at hand that comes closest is a BAW76, specs (and

Hi John & Evan, Am 15.01.24 um 22:00 schrieb Stefan U. Hegner: Replaced my Q508 and now all the sweeps look good to me. - I think I maybe post them later for reference. Thanks a lot for you help,

Hi Peter Li, I think the Zeners will provide some protection against SWR that results in high voltage, not in SWR that causes excessive current.? A bad SWR can cause either, depending on the

Thanks (again) Evan! For voltage, don't the Zeners give SWR protection that the L14 diode does not give??Do you think doing both Zeners and TN0110/TN0106 is also perhaps belt-and-suspenders? For

I've just checked my V3..Firmware 1.10. I guess I fixed the audio short if that was relevant It has a clock buffer like the V4, .I do not think that will make a difference. I did audio and RF scans

Simon & Randy - thanks for the replies to my post. I understand the dangers of auto-tuners with the QMX/QDX rigs. And it is unfortunate that the little PA units aren’t robust enough to withstand the

Hi Bob. thanks for the idea. Its called contrast <improvement> in the manual but either way it certainly effects brightness at extreme settings. I'm okay with it as is. I found a 220k in the junk box

Lynx, Have you tried returning to 1_05 to verify it is a software issue?? It could be that the Si5351 has failed.? If you return to 1_05, please post a screenshot of the oscilloscope trace. Of

Today I use firmware v1_10 do some test again. I use a?oscilloscope watching R41 and R40(CLK0 and CLK1), and found something strange.?In theory, CLK0 and CLK1 should have the same frequency but be

I use a cheap (47 EUR ) 858D clone I bought in my my local electronics shop with no problems, so far. It's really a big ?helper enabling to avoid mess on your pcb when it comes to removing

Great news! Have fun with it! Regards, YO3GFH op. Adrian

Thanks very much Adrian! Now have a fully working QMX!

I would just try flowing the solder around the encoders to see if that helps. On my qcx-mini they are fine on my qmx the right vfo encoder does at times miss the fact that I'm turning it but

I've used the ATU-10 and ATU-100 in auto tune mode with both my QMX (and some QCX mini before) with great success to tune random pieces of wire (and efhw antennas for bands they were not built for)

Good morning John, I now realized that I sent the wrong photo, in reality the C30 is installed, instead for L4 I used the yellow T37-6 because on the color scale the yellow ranges from 3 to 50 MHz

Upon installing the firmware, at first boot, the software asks what flavor of QMX it's running on. You probably answered "20-10m" by mistake. Make a long press on the left small button, the menu