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Alan, Yup. IC5 is backwards. I will remove. Is it likely to be blown? Thanks. John

By the way the transistors I used for replacement were the real deal from Mousers. Jess

I tried a different set of headphones even though the ones I was using are 32 ohms, no difference.? Tried adjusting the trimmers and while there was some attenuation when I adjusted R24 the tone was

Hi Jose, A short version of the case with "QCX 20m" would be great. I tried to edit the files myself, but didn't get very far ;-) Steve G0KYA

Hi Alan - we tried the well used 30m band. But I had now the idea to check the transmission with the WSJT-X Software connected to the K3 - RX. So we‘re able to check the Signal in the band window

John I have used RG174 in the past in other projects BUT an eminent experimenter here in VK uses fine shielded speaker cable for short runs, cheap and suitable for short RF connections I have used it

Hi John,? I just used a scrap piece of rg58, to be honest though you could just use two pieces of PVC hook up wire for the short distance that's needed.? Andy

John, That sums it up, a few inches of the worst 50 ohm cable will make no difference at HF. Maybe ideal is the thinnest. 73 Alan G4ZFQ

Hello, I just finished building the U3S kit I was working on a bit ahead of schedule. I am still very new to building radios and one silly thing I struggle with is connectors/jacks/switches and how to

Hi Bill Try turning R17 and R24 trimmers. I had one case, where R17 was all the way at one end of its travel, and therefore zero ohms. So IC5B had its output loaded with a 10nF capacitor to ground.

And made me feel better knowing the parts I replaced were bad. Jess AE0CW

Sounds like monster audio feedback. What kind of headphones preparedness you using? You should be using the the ohm specd in the manual. 32ohms? Not sure. Mine would do the same thing until I used the

I finished my 40M QCX today which I built into a QRP Labs enclosure.? Upon power up the display works fine and I did get the rig set to 40 meters in the menu but it is putting out a very loud

Got that! Thirty-three days later. I also got a package from AMSAT-NA 29 days after they mailed it 1st Class USPS from Maryland, USA. Post XMAS our US Postal System appears to have crashed. Except for

Phil, sounds about right. The best I could get from my QCX 20M version is about 2.1 watts. Joel N6ALT

Hi Alan, I am back in business :-))).? The problem was a shorted Q6.? I think I had the problem when I hooked up the GPS, and may have not had a dummy load on it. (I did have to replace one or two

Hi Mario, Thank's for the information. I always think twice before I suggest replacing a part where you cant prove it's faulty by some means, but I think? you may be at that point. (You are 101%

John, This is puzzling, 2 amps will not pass through much without instantly blowing it. 4.9K means it is not directly shorted but going through a component. Are IC5, 6, 7, 8, 9, 10 the correct way

Hi Jess, Glad your QCX is working. Cheap transistors etc from china are a gamble if they are up to specification and even if they are actually the device they are labelled as. When something is TOO

Alan, 4.9K after D3. Disconnecting L4 does not do the trick. (I found a cap not soldered one side, but fixing this did nothing of course.) John K1ym