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I was thinking that it might be more trouble than it is worth when you mentioned digging for new inductors. If you are worried about the leaded ones physical security to the board, once you get it

I get mine(barrel connectors) at Hamfests and yard sales by picking up old wall warts and cutting the cable off at the wart and tossing it in the trash. They are usually free or dirt cheap laying in

I certainly will do, Reg. This stuff seems like magic at first, because it take a fair bit of experimentation to even observe - let alone interpret - the sometimes very small behavioral changes that

The self resonant frequency is often on the datasheet for these inductors. However, but as Hans mentions, you have to also consider the harmonics as well. Anyway, If I were to experiment I would start

I have still not received my QDX , but tracking are saying 4/11 - thats good. But studying the manual and schematics - I wonder what would be the best way to do some measurements on the TX and RX

Interesting thoughts. I did take out L1 - L4 and could now very that the filter caps were correct. Then I took out my LCR meter and measured the inductance of each coil and I could see that they

I don't know the answer either. I think the only answer actually is trial and error... If you want to substitute components other than those supplied, be sure to carefully check the harmonic output on

Hi Rich I believe you are referring to a thread which mentioned occasional problems with 20m Low Pass Filter capacitors in early model QCX Classic kits. It does not apply to any later QCX-classic, or

Allison, Thank you for the explanation! 73 Evan AC9TU

I don't know the direct answer, but if you're wanting to fit SMD parts rather than the leaded parts because it looks hard- it's not. Not at all. I'll be posting a video about it today or tomorrow. I

Hans, I’m at work now and can’t access my email program at home. The thread was from earlier this am (about 5a CST)?and pertained to several caps which need to be replaced in order to get

Let us know what the final outcome is Julian. I have a similar problem with an original 20m QCX. It has worked well and had numerous QSO's. I couldn't get more than about 1.6w out of it. Had a go at

The simplest solution I found was to use a laptop with a USBasp adapter cable. Then I use avrdude to program hex files and the IDE with MiniCore board manager for bootloader and Arduino sketches. --

The ARRL has a lengthy statement about amateur operation in the U.S. on 60 meters that includes this:

The QDX is not the issue, FT-8 is. FYI QDX is not a mode but a transceiver that implements a set of modes. Seems the rules for 60M (USA) are data and CW is in the middle of the channel and channel

Hi has anyone found some SM 47uH inductors than can replace the original ones that self resonate in the HF band? or could I put a cap on top to move the self resonance down to MW? I would rather

Hi my QDX, has arrived safe and sound in the UK exactly 3 weeks from ordering 73 Andrew

Allison, The band chart that I have from the ARRL has "USB, CW, RTTY, and data."? Would not the QDX fall under the data category?? The limits are for 100 watts and "one signal at a time" which

Hi Ron, Great idea. Evidence of that would be found in the wave shape at that top end of C30, eh? I'll compare it against my own working 20m unit. Thanks for that idea! -- Julian, N4JO.

Julian, one more thing to add as a possibility. I once found a bad C30 that was keeping the PA from operating in Class E and showing lower than expected power out. Just a thought .... Ron