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I've seen discussion about the possibility of building a 160M QDX-M... But haven't found anyone that's documented doing it, other than Hans saying he ran some WSPR on one? I see filter values for

Nate: yes and yes.

When you say your scope is calibrated.....what do you mean? Were you using a x10 probe with the scope? Was the probe properly compensated first? -Nate N8BTR

I used the 47-volt version from this Amazon assortment (I always buy assortments to build my parts bin). https://www.amazon.com/gp/product/B099F24G22/ 73 Evan AC9TU

Probably T507 has one unmade connection (on the thin wire). I would believe the scope reading, assuming a good 50 Ohm dummy load. Most of my other power readings disagree!

Hi Stefan, " lower IR" should be no problem, lower IR is better for reverse operation. Look here ( https://html.alldatasheet.com/html-pdf/15021/PHILIPS/1N4148/745/3/1N4148.html ). The worst value for

My QMX hi-band build is great so far. Am currently measuring power output. However, I have two concerns: * The terminal emulator Diagnostics power output indicator always reads 0 watts out, even

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