The U4B is a masterpiece. Greetings from Arizona Mike K8MB

Nice work. Long anticipated!!

Very cool! I think this will be on the docket for a father daughter summer science project.

Very valuable and fantastic project.

Thanks so much. I’ve looked forward to this.

That is an incredible project! Want one to try it but I have not done a balloon before, very intriguing!

Man, you killed it again! 🙏

This is great. I've really wanted to get some balloons up in the next year--this is exactly what I need! 73, NG2E

That is an impressive little firmware. Basic kind of hurts my brain as a c/c++ programmer. I haven't written in basic since I was like 12 years old. Over 25 years ago. But impressive none the less. I'll have to get one ordered soon along with a QDX.

Glad to see this, Hans - now to source some helium... 🙂

Is there some ready code available? like the geofencing for example.

What is the current draw while it is in tx on 20m full power?

Do it have 4fsk modulaton?

Do you plan on making more??

@QRPLabs

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Yes... There was a long lead time for the SIM28M GPS but I finally got them last Saturday. I now have 500 boards waiting for assembly and expect them in sale again some time 3 weeks or so from now!

@d.jensen5153

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@@QRPLabs Great news. Thank you!

Shut up and take my money!!!

@QRPLabs

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That would be my pleasure! shop.qrp-labs.com/u4b