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What kind of power supply are you using? Try running off a 9v transistor radio battery, or something else reasonably quiet. Do you have a 50 ohm dummy load at the antenna port when testing? I'd try

I’m bumping this to see if there are any more ideas. I’ve checked everything I can think of. I rewound T401 (the trifilar toroid) and replaced the PCM1804. I’ve followed the audio chain through

I have a factory built 30 Meter QCX+ for sale, $80 shipped USA, contact me by my QRZ email. W6TOM

Oh completely understand. I don't actually use that worktable for actual power on testing. At most, I ohm out detailed checkpoints or other ohmic confirmations of connections. If I've removed the

I prefere a non conductive esd mat. The mat and wrist strap have resistors in. I also use a plug with just the earth connected and not had any issues in 25 plus years(apart from replacing the strap

Maybe it is regional... My QMX+ kit arrived today in PERFECT condition. No damage to the outside packaging. The 1st thing I checked was L501: AOK inside an anti-static bag, inside a paper envelope,

Florin, Sorry for my previous post that was late.?? I didn't realize that there was a second page to this thread.?? I believe you have your QMX running now.?? Good on you.

Nice idea, Greg. I prefer working on a non-conductive work surface, so I don't accidentally short things while testing. There are several low-cost (under $30) ESD mats available on Amazon, including

Andy, With that current draw, there is very likely something shorting or not connected properly on your board - this is much more common than a component failure, especially capacitors which rarely

I second the accolades Jeff receives. I sent him a non functioning build and received a jewel in return. Many thanks to Jeff!

John, Just checking: when you say that it is a good battery are you measuring the voltage under key down/transmit conditions or just during RX.? When a battery is low, it may measure 12 volts during

Just to clarify, also re-arranged on the top of the board. But no documentation exists for these changes.

On 2/24/25 I had a CW practice / rag chew session on 20 meters. I worked five stations: Date / Time Call Bnd Frequency Mode Power Rec Snt SPC# Name Comments 2/24/2025

I thought I had the wrong pair of glasses on! ?????? [email protected]> wrote:

Thought others might be interested in this. Picture attached of my low-bucks ESD work surface. Built my first one about 25 years ago and a second one recently for my winter QTH. Materials Needed: 24

Sorry, it shouldn't have been sent to the group.Gary

The photo is very blurry. -- 73, Dan - W2DLC

----- Forwarded Message ----- From: Gary Bernard <garybernard2@...>To: Home Bernard <garybernard2@...>Sent: Monday, February 24, 2025 at 10:06:44 AM MSTSubject:

Components were moved to the bottom side of the board.

Jeff, you are a real asset to the QRP Labs community. Thanks for all you do. Mike Krieger <jeffreymoore@...> wrote: