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this one made me order a new decoder ring from Amazon.

John, wrong number 42 is missing ...Hajo

OTP=15#NEXT031121 25, 24, 22, 10, 20, 18, 18, 11, 25, 30, 20, 19, 37, 29, 34 John N3AAZ

Think if it this way: adding turns of wire is cheaper, in the long run, and faster, and it can be done less destructively than replacing a cap. Given that sometimes one has to remove turns, then the

Congratulations Andrew! Let us know how the Raspberry Pi and POTA work for you. 73, Evan AC9TU

Gentlemen, Thanks for the help. You where correct. I retested and I had ZERO output on all bands. I applied more heat for about 12-15 secs to all the filters and the output transformer T1. I now have

Andrew, Are all bands showing the same issue into a dummy load?? Have you tried 80 meters into a dummy load?? It may be the LPF selection has an issue. The other thought that I had was one of the

Thanks again guys. I still don’t understand if Hans in his wisdom suggests adding 5 turns and not mentioning that adding capacitance could maybe work as well that adding the capacitance has some

Andrew, As always check inductor wire soldering, especially as Hans says, the ones with thicker wire. Re-check, resolder anything that just looks slightly wrong - and those that do not. Measure the

That would be great, John! Tonight, the final build videos: QDX Build Part 14: SMD Inductor Replacement (Rev 1 Only) : https://youtu.be/G9UffyGEBjE QDX Build Part 15: Putting the QDX In Its Enclosure

I had to go over the LPF inductors again on mine, as I was getting no output on 30 and 20m, which share L4 and L10. I'd recommend the same. Crank up the heat and hold it on those inductors for a good

Pressed send without inserting a link to a YouTube which also explains the calibration process with the NanoVNA saver. https://youtu.be/2S0dt0bYoLs Hope it explains the procedure. -- 73 Lex PH2LB

Hello Larry, Try to compress or distribute the windings to see if you get a better pass through. I measured my 30m LPF and get a pass through of -0.42 dB on 10.150MHz. With the same turns as described

I finished the QDX build and during testing I show no output power on transmit to a dummy load. I installed an antenna to check receive. Receive works fine. I called CQ and checked PSK Reporter. I'm

John -? ? I think? Woody says? it best .... "I have to go now? Duane, because i am due back on the planet Earth " PS stay away from the borders of the former Soviet union - you might see? burned

I increased my supply of disk ceramics from digikey when I got into the QRP Labs kits. Mostly so I could modify the band I was building for, etc. I got an assortment of toroids as well.

Thanks Hahns for sharing this level of detail with us of how totally complicated and beyond most of our imagination it is to developed and produce what we can easily take for granted.? The magic of

I have been trying to use my Nano VNA -H4 and PH2LB fixture for the low pass filter with NanoVNASaver software.Making my first QRP-Labs 30 meter low pass filter I get an insertion loss of -2.31 down

Oh, please no ;-) That would mean repurposing my old electric griddle as a preheat oven... -- Julian, N4JO.

I know that YOU know, but I wanted to avoid any confusion for those less savvy than you!