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In my case, I went out of my way to ensure that I had proper ESD procedures in place when I opened and assembled my kit. Wrist strap, anti-static mat with grounds. The unit powered up perfectly the

Hi All I finished my QMX+ build on June 28. After some tweaking on the LPFs it was on the air and working well. I worked the 13 Colonies Special event? with the QMX+, worked all 13 colonies and

Both my QMX builds came in an anti-static bag. The instructions do say to observe ESD precautions, but the boards see quite a bit of handling by the builder to separate the various sub-boards and

Doh! Indeed it is. What I was seeing was the prototyping board through the bubble wrap, now that I've got the thing completely unpacked. That rules out my shipping idea.

Dear? Ludwig, thanks for the links.?? I got them yesterday and used the information to try to log into the diagnostics... I did get the hardware page and some helpful information. thanks for

Hello Chuck The main board IS anti-static packed... 73 Hans G0UPL http://qrp-labs.com https://www.buymeacoffee.com/g0upl [email protected]> wrote:

Wolfgang Pauli once said to Niels Bohr after a lecture "Your idea is crazy, but is it crazy enough?". My kit arrived Monday, and I've been finishing a 1.25m repeater before starting (think of a horse

Thanks Jim, let me know if you find anything... 73 Dave G4FAW

I believe the Audio filter is the one designed by Dave Cripe, NM0S, so you can get info on how to adjust the parameters from the documentation on this link: https://www.4sqrp.com/hipermite.php -- 73,

Randy, I don't know if it would be significant, but did you consider magnetic shielding? A steel jar lid might work. -- 73, Dan? NM3A

TI actually has a white paper on failure rates on the documentation page for the chip, for those who would like to do a little casual reading. It's more generic for their manufacturing process and

Counterfeit is NOT a possible explanation. We order them directly from Texas Instruments. 73 Hans G0UPL http://qrp-labs.com https://buymeacoffee.com/g0upl wrote:

Add me to the list that had to replace the 1804 . I had never thought about counterfeit.? At least one aliexpress seller seems to think calling their's non-counterfeit is a selling

Don statement is not? generally true for batteries. Between 35 C and 40 C there is a temperature that will trigger a massive slump in? Pb battery output (the? exact triggers for the voltage slump

I'm waiting for my replacement PCM1804, too. Hoping that it will solve the issue with my QMX. I would agree to Andy. There seems to be an issue with this chip, but if you just take a look at the

Greetings John, it is an A/D converter. Please see attached datasheet. Hi Phil, it happens very rarely. If you sift through the archives you will find several knowlegable OMs who have the skills and

But you have ham friends who probably have? Or there will be someone on here local-ish to your QTH who can help. And remember, you only hear about the problems not the many hundreds of boards that

No.

Is the 1804 a successor to the COSMAC 1802 which we flew in Oscar seven and Oscar nine? It was the only space qualified processor which we were allowed access to. John G3PAI F5VLF

Hmmmmmm!? this PCM1804 issue is giving me the jitters! Ordered a QMX+ a few days ago and if this is a problem. I don't have the tools or skills to replace the chip. If I do get a faulty one, is there