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Why? What would you use it for? -Lee- WA3FIY

With a firmware change & using the 40m LPF? Es posible? -- John AE5X https://ae5x.blogspot.com

I didn't notice that out-of-alignment cap until I posted the photo - now it's bugging me big time. Now I gotta make like an orthodontist and snap that little baby into place. -- John AE5X

It would be interesting to know the context of how and where part is used to determine if it's a problem. Presumably the qdx works already is what I am thinking. In a few apps designers I observed in

About 1h15m into the build. So far, so good: -- John AE5X https://ae5x.blogspot.com

So ... it appears the QDX is not useful on 60 meters. It will not do pactor or PSK31 which are the only modes allowed on 60 meters. That ARRL posting is quite enlightening. Oh, the QDX does not even

The US rules for operation on 60 meters require that CW and digital signals be at the center of the channel. That would appear to allow only one FT8 signal in each channel at an offset of 1500 Hz.

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. --