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When I finished my QMX rev 4, 12v build, it would not mount as a USB drive. I received several thoughtful and helpful suggestions from the community here. Thank you. I followed the suggestions as

I was looking at your spice model and noticed an error. The 1:1 transformer primary inductances are wrong given the secondary inductance of 4.4uh. The primary halves should each be 1.1uh, 1/4 of the

Yannig, good point from Chris about the shown values. And there is an interesting information from your screen shots. The second and the third are showing the 3.3 V working at the limit (Duty cycle

Don't leave USB power test meters in line when you are not actually taking measurements, and when you do, make sure no other equipment is hooked up to the power bank - either before or after the

That's an interesting one. I'd start by checking the actual voltages, measuring using a separate meter.? Check the '+12V', VCC (5V) and VDD (3.3V) voltages at the different input voltages, You may

Hello again, I had the time to think about it further... I can't make my QMX do SSB, I was blaming the microphone but may be there is something else going on. Whenever I do SSB, it is very noisy

SWR is calculated by measuring the forward and reverse voltages obtained from T507 and calculating the SWR from those.? It there's no power out then those values can still be measured, they will both

John I started seeing dead parrots :( 73 DE muhsin TA1MHS

Hello Daniel, I used a microphone from an old Panasonic phone. I don't have any information about it, but I tested it in the terminal and it had very good sensitivity and dynamic range. 73

Muhsin, Others have said 5.5 x 2.5mm works, then their QMX failed. It seems risky to depend on a plug that is not the correct size. When I look at your link I say "It does not have the correct size

If you look into this link, You'll see 3 types of plugs. Only 5.5 x 2.5mm plug works with QMX. This is not what I think, It is what I and other people are using. What we know/read may not be the

Gluing the pieces of the toroid back together is the easiest way and works just fine. 73 Hans G0UPL http://qrp-labs.com https://buymeacoffee.com/g0upl [email protected]> wrote:

That's why I mentioned it in my original post.? The SWR is reported in the Diagnostics page on the terminal when I hit T for Transmit.? For me, it's all over the map, sometimes reporting in the 6-7

Thanks Stan. I never studied magnetics so I wasn't sure how well that little core would react. The wires are still connected and none of the windings have come undone. I'll try gluing it tomorrow. I

Yes, it should work fine if you carefully glue it back together, as long as the wires are not broken. And if you need a new ones, I have used the 330 ones from this Amazon

Great comment.Two thumbs UP. GREG Yahoo Mail: Search, Organize, Conquer On Sun, Apr 6, 2025 at 6:49 PM, John Pokluda via groups.io<john.pokluda@...> wrote: Why on earth take

I had been trying to figure out why I could not make any ft8 qso's. Seemed wsjtx was connected, got audio in my ear when transmitting. Would change radio bands. Turns out I missed when reading the

I think L403 is coming off the board tomorrow.... -- 73 Karl KI4ZUQ

I seem to have found my way into the Monty Python 'room for an argument'

Muhsin is correct.? As I noted in my original reply, some 2.5mm connectors may work.? Some are designed with spring contacts, and are advertised as being compatible with 2.1mm.? And those do