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The factory pre-programmed versions of the Si5351A are often not suitable because they have a different I2C address as well as default registers values wer up for specific output

Those output powers you listed, are very close to my QMX+ build as well. ?Looks normal to me. ?I've worked the world on this rig already! VE7SRF

Hello Shirley, Steve In my opinion the QMX should show considerably better strong signal performance than reported in the QST review. If you compare it with the QCX review for example, the QCX review

To put those numbers in perspective: the QMX doesn't have the strong signal performance of a state of the art 2024 design, nor should we expect it to at its price point. Aside from the number for

Same here, it all personal preference and some amount of how I use it. My favorite RX is still the QCX with the audio filter modded for SSB (Hipass 250hz, LOpass2400hz).? And a lot of close

Please note that the bandpass filters are only for receive, so they shouldn't be affecting your transmit.? The low pass filters, along with the two binocular toroids are in the transmitter path -

Also before someone gets triggered I was having a bit of fun here. There are gross generalizations, biased opinions, and otherwise non objective feedback included in my last post. Mixed with a few

The QMX doesn't have a speaker, and how good the sound is will also depend highly on the speaker you use.? I agree with those that have praised the QMX audio, but have also heard it be raspy and

Good to know.? Thanks!

I’m just a guy with another opinion. One that may be interesting to some. I went to school for audio engineering. I’m a bit opinionated about what sounds good. I use an icom 7100 because it’s a

Here are my output values by band. I did a little squeezing and expanding with the Low Pass Filters but didn't gain much. I'm not sure if these are typical or not. BAND??? Output

Ok, I found that L4/L10 weren't soldered well.? Now I think I'm getting closer to right thing regarding the diodes, but still not sure they are quite right. Running 9V, I am getting 7.2V across the

Hi All. Back in 2020 I mistakenly ordered a Si5351 that was pre-programmed for a fixed frequency and it did not work in a QCX I was repairing. I had to order the correct one that was not programmed.

Thanks - colors did not reproduce correctly in the specs on the left side of P38. Here's a version with correct colors. -Steve K1RF

Hi Chuck, I think I have the same feelings as you when it comes to CW. ?I had two Yaesus, with cw filters- different machines, and I just could not have a pleasant experience with either of them on

Matthew, My 12 volt QMX draws plus or minus 200 mA at first, then drops to 95 mA once the switching power supplies are working. Is your current limit set high enough to allow the initial inrush

Here's a fair use copy of the review only: https://bit.ly/qmxreview

Interesting that you call IC7300 as "WARM" when many like to complain about the hiss.? I have one and it has with the gain up a lot of HISS compared to my TT Triton. Myself I find the Q(C/D/M)X kits

Far as I know, the MS5351M has no documentation for its internal registers. The only documentation for those registers is what was written by SiLabs for the Si5351. The MS5351M is not available from

What a great persuasive writeup on the QRP Labs site for the QMX+. Since Audacity graphical output is used in the presentation, why not attach the actual MP3 file? With my present degraded hearing I