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Frank, Just resolder the inductors. At least 90% of LPF "faults" are just inductor solder joints. 73 Alan G4ZFQ

Hi Chris, seems, like everything is ok. But there is still only very very low output on 30/20. So, for test I changed LPF-assignment for 30/20 to LPF 1 and there at least I could see a much stronger

https://www.allaboutcircuits.com/technical-articles/x7r-x5r-c0g...-a-concise-guide-to-ceramic-capacitor-types/ I have learned more building this one kit than ever!

Thanks Walt. Just the display to build and im nearly done. Mike

That's good news. I'll send Karl the proper value cap later in the morning.

Sure, Peter. I added it to my list, that should be no problem. 73 Hans G0UPL http://qrp-labs.com https://www.buymeacoffee.com/g0upl

Hans, i wonder would it be tricky to route the incomming audio through the headphone output for digi mode when in TX? I mean something like a monitor output with volume setting in the digi interface

Hello Bojan I'm unclear what you're asking. I reviewed the previous posts again and I'm still unclear. It appeared to me that you wanted to know if PCB #2 was absent and you were using an external

Hi Rick, all All the SMD ceramic capacitors on the board are unimportant non-C0G (means probably X7R). The places where it is important to use NP0/C0G are in the BPR and LPF areas and these

If you haven't already looked at the troubleshooting guide it may be helpful. https://qrp-labs.com/qdx/qdxtrouble.html <https://qrp-labs.com/qdx/qdxtrouble.html> 73, Cliff, AE5ZA

Okay! Thank you! I do have several 100 nf tiny leaded caps I may try while waiting for your gift. Whatever the value of C509 it definitely was 0603 size but on its side. Would still worked except for

Hi Ron, Thanks for you assistance.? You're right! I hadn't thought about that. It is confusing considering the fact that the C1 is only tuning a tank circuit in the receiver front end.? But I think

Casey, If you have the Tx Attenuator set to zero in fldigi then that is the best you can do as far as audio into the QDX. Of course be sure your system mixer settings are set to 100% for input and

Yes, I know the input has no affect on the output, just noting that something is working between computer, software and rig. It is built for 12V, currently running it at 11.8V, same behavior at

If Hans says X7R dielectric will work fine for C509, I will send you one! Mouser simply does not have 0.1uF C0G 0603 MLCCs. It's the same issue now as when I bought the caps a year and a half ago. It

OK, it CAN be done. First I had the dreaded Q103 short...smoked. Got Q103 and D101 replaced and came alive. Low sensitivity was improved by the #2 mod on the L401 Toroid. (in Han's troubleshooting

Study the manual on how the QDX works, and you will find that the audio level of the input has no effect on the power output. There is either enough audio to turn the transmitter on at full power, or

No matter. I really appreciate your effort! That is so inadequate for thanks but I am extremely greatful! I may have a couple of ceramics that may be small enough....with the apparent confusion about

It looks like I do have a 50V 0.1uF 0603 I could send Monday, but it is not C0G, it is X7R. That might not be good enough.

OUCH! I'm very sorry to hear that! Feeling your pain! Hans posted earlier today that the power supply boards can now be purchased for $10 a set. There is a delay, but he offered that there were ways