Hi Mike, Great build! It looks like the fuse settings are incorrect, resulting in setting XCK clock output on enable pin 6. If you program with Arduino IDE, simply run a "Burn bootloader", or program

Sorry Phil, I misread your question, so my answer does not make sense, and please reject my previous email. It is a good question what happens for value in between 128 for P2, no idea...never tried.

Hi Phil, My understanding is that this allowed and works. as it meets the criteria that "a+b/c has a valid range of 15 + 0/1,048,575 and 90" [AN619 p.3 par. 3.2]. A zero in b means that there is no fr

Hi Scot, So, yes it's possible to modify Rev 5 QCX to the latest QCX-SSB firmware, even if you decide to keep the existing analog phase filters etc. It will automatically detect on startup and recogni

Hi Scot, Yes, if you have a QCX already built you can still run the original SSB mod (without removing half of the components). It also works on as Rev 5 board. To do so make the following changes: SS

Hi Mike, Not sure where this is heading to, but yes, was thinking about your second option. Maybe there is no need, and maybe a single firmware can server both projects. As soon people start feeling t

All, amazing thread, and great idea to collaborate on a compact SOTA transceiver for the summer! @Mike, regarding your question, my plan is continue developing QCX-SSB and make it suitable for use in

Ryan, very good progress on your QCX-SSB and happy to read you got the transmit section working. Your temporary enclosure looks pretty nice actually! Not seeing RX side-band rejection can be caused by

Yes! These special characters need some additional effort to make them uploaded to the OLED. Do you see the encoder skip when tuning the frequency (or only in menu)?

Hi Ryan, These resistors may also be 75K, you lose 0.7dB sensitivitity which is probably fine. It is most important that that two resistors are the same. Maybe I am colorblind but on your picture I se

All, Note with R1.02c there a bug with the CW offset not being stored well. Manuel, DL2MAN just told me about this; so if you have downloaded R1.02c please download it again because I have fixed it. .

Hi Peat, Congrats with your very nice built and very good to hear your Rev5 is up and running and that CW works great! Yes, its possible to hook-up a (passive) speaker(8 or 32 Ohm) directly to the hea

Hi Mark, Using a QCX SSB as Microwave transverter IF, is a very interesting use-case! My immediate thought is that it basically allows you to make a GHz class-E setup: you can inject a constant envelo

Hi Dean, All, Please find in GitHub an new update: R1.02c: 1. it has selectable CW Pitch (325/700Hz) was before only 325Hz is is a very looow tone 2. It probably removes the underline you saw on your

Hi Dean, Is there a LCD issue with R1.02b? The R1.02b ino file is on just the regular QCX-SSB.ino file. I am very much interested with the enclosure, congrats with the build.

Just had contact with Christiaan, here is a follow-up: So, Christiaan's QCX-SSB kept hanging due to wrong fuse settings. It is the best to use the default Arduino fuse settings (you can burn them as s

Hi Christiaan, Can we debug this offline? I have whatsapp, can you give me a call?

Hi Colin, Here is the schematic: https://raw.githubusercontent.com/threeme3/QCX-SSB/master/schematic.png Other details here: https://github.com/threeme3/QCX-SSB 73 Guido

Many thanks Skip! But actually this thanks should go to ALL of you, because without you this project would have simply not possible to bring it to this stage. So thank you! And.. as we are not there y

Hi Hans, On the github there are instruction for the earlier Rev4 and also work on earlier models: https://github.com/threeme3/QCX-SSB The Rev 4 and 5 circuit is exactly the same, so no differences.