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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

The devil is in figuring out in which step of the procurement to testing process most A/D failures happen. Hans likely has some failure data from the kits they've assembled. I wonder how those compare

Thanks Hans :-) Listening to it again, I think what you were talking about was that the QMX has built-in test and alignment tools, similar to QCX. Very interesting presentation b.t.w. really enjoy

Hello Eben May be a verbal typo :-/ QDX and QMX-series support terminal log in with a terminal. QCX-series do not. QCX-series have a 38400bps CAT port, but not a terminal login with PuTTY. 73

In the recent QMX+ talk Hans gave to the RSGB https://www.youtube.com/watch?v=6FheeAv3src&t=2849s At around 47:00 he mentions terminal emulation via putty for the QCX... Did he maybe mean the QDX

I think you will carry a camera also. I want all nato allies know russian cameras works at minus 25 celsius, degrees , I tested in deep freezer. :) I wrote that if the temperature drops suddenly in

Steve, I’m working on the speaker idea also. Have you found any issue with the speaker’s magnetic fields interfering with the toroids directly below? I’m doing a half height implementation so if

I wonder if there's a way to test these (quickly) before they go out so that the DOA ones get swapped before they are kitted/used in a build... 73 -- Matt N3AR [email protected]> wrote:

The QMX has been sold. -- Jim / K7TXA Eagle, ID SKCC 10447T BUG 301