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You need to do some fault finding Your description of the issue is suggesting too low a resistance exists between the USB power wires at switch on A thermal camera would be a good aid here but a

Mouser sell them IIRC - or were you meaning an alternative ?

Really interesting, I'll follow that, keep us updated !

Just builded the qmx but no life. It draws no current ?but switching on draws 150mA. Looks like the rotary encoder works. The USB was complaining that the port was asking too much power so Mac M2

I sat down and did some methodical analysis on my 60/40 RX and TX not working.? After double checking the RX section I looked at the input and output of the BPF on an O-scope while running the BPF

My QMX 60-15 had the shiny black ones and the instructions were clear enough to make them.? A little frustrating to troubleshoot such compact circuitry but made it through a couple of issues and it

Hello, I just built the 10/12/15/17/20m version of the QRP Labs QDX digital transceiver (revision 5). I used the QRP Labs QDX website manuals and watched a multitude of YouTube build videos before

Actually, the first paragraph in the latest transformer1_00c.pdf adds this: Cheers - Bruce K1FFX

Steve & Group, Good, to the point video. 73 W6CJ aol.com_at_groups.io_lastradioman@...> wrote:

Yes, that's the normal circumstance with RF amplifier kits....builder has to make it meet on the air specifications.

Dan, I am a retired EE, and easily 50 years a ham. I know about band conditions, have experienced a lot of different receivers, and through the conscientious use of PPE, have ears that still work

Dear Thomas, Thanks for the quick reply.? I can also envisage that using thinner wire will make it easier to thread through the holes with less likelyhood of damage to the enamel. So an improvement

Hi Stan, if you decide to do another round, I would be interested in one unit. Thanks and HNY! -- Karl Heinz - K5KHK

Yes. the bottom. Ed AB8DF

Dan W2DLC wrote… Is it voltage dependent? If you are running it from a battery that can’t quite supply the current, you could try putting a super cap across it. -- 73 Keith VE7GDH

Ed AB8DF wrote… Just to be sure but e.g. for 80m, is the tap at 15 turns from the “top” of L1, or from the “bottom” of the inductor? I’m assuming the latter, but… -- 73 Keith VE7GDH

Dan, Are you bringing it to FDIM? Ed AB8DF

I still have one of those I built into an Altoid tin. Mine is in 20 meters, but it chirps a bit. -- 73, Dan - W2DLC

THE MICHIGAN MIGHTY MITE REVIVAL The Michigan QRP Club is holding a REVIVAL! During the ARRL 2025 Hamvention and as part of the ACRI Four Days In May event, The Michigan Mighty Mite will have a

Group, These are my AGC settings. Threshold S: 7 Slope DB per DB: 60 Noise filter: 5 Hang Time: 30 Smooth Samples: 50 Recovery DB/s: 50 Sample Blocks: 2 S9 sounds like: S9 AGC