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ATU100 wrp use modification: https://youtu.be/dPys_-_wPcQ?si=j7plTKG23MPoFSTm -- 73, Barb

Hi I am experimenting with QDXs (40-10, no LPFs - no BPFs, using magnetic loops, BARBs?FDT86256s vs) so I consume a lot of BS170s it is easier this way. (take out, test, change) now with QMX

I recognise, given what I've read elsewhere on the forum (particularly Hans' explanation of the power up sequence) and from reading the schematics, that if the 3.3V linear isn't working, then nothing

Actually, to make this clearer: when I put the new PSU modules onto the old main board, everything works, but new modules on new mainboard, no 3.3V rail on the pins along the top of the mainboard PCB,

No, the 3.3V regulator isn't coming up, at least one the older mainboard it does, but not this one. So PSU modules themselves are working.

Hi Alison, I used to use a Z-matches and they were good but FRI-match (PA0FRI) with printed toroids is much better! Wheatstone LED swr indicator very simple and effective. I do not even bother with a

Oh wow, Now I have seen that all three ATU-100 tuners have the operating software set to 3.2 when they were purchased. How can I now check whether the corresponding changes to the minimum input

Oh dear Oh dear, you should always look closely! I'm currently assembling the fourth ATU-100. I ordered the first three about 2 years ago, they still required 5 W for control and, according to the

I just see that the currently delivered ATU-100 with program version 3.2 has already been changed to 1 watt input power for tuning.

Good morning, Yes, you have to somehow push the required power into the ATU-100 so that it rattles properly and quickly. A small transmitter with digital frequency setting would be ideal, regardless

I think i didnt have my dummy load attached all the way. Still lots of issues. I need to replace C508 and L503 at minimum. Any recommendations? I have 2 ceramic disk capacitors in parallel replacing

It's true. Last line of Rev 2 mod page.

Can you tell if the 3V3 linear regulator is coming up? If it's not, then the MPU won't come up and turn on power hold. -- Paul -- AI7JR

I have QDX high band and low band radios. Both assembled by QRP Labs. I noticed that the high band was not receiving many stations, and thought the band must be closing - over a month or so. Then I

Per, I have exactly the same problem with my Rev 1 QMX build running firmware 014. I had good results running barefoot on Ft8 and thought I would try hooking up my QRP Labs 50W amp. Much to my

Found the problem! The Source leg to Q507 (an AOD403 MOSFET key shaper circuit) had not been soldered to the board during factory install of the SMD components. I hope this will not be an issue for

Have you looked at the sweeps to see how they look? 73, Cliff, AE5ZA

I finally got around to building the version one QMX I purchased last year at FDIM.? The build went well and I thought I has no problems, but it appears to be weak on receive. I have 4.95+ watts out

Besides being amused by the hard way approach, some thoughts. The test transmitter has to put out the needed power on all bands of interest.? ?Easier said than done for many. I has to be robust,

The downside of the connector is to degrade the heat flow through the leads - a major element of the heat sinking. A couple of days ago I noticed power out dropped to 2W.? It took *one hour* to open