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Well when I got home I removed the GPS Module and started probing around, only to find that basically, every Vdd point I could find, is connected to Gnd :-((( I think I'll have to call it quits

Looks like a nice little IC: https://www.monolithicpower.com/en/mp1584.html ( https://www.monolithicpower.com/en/mp1584.html ) 73, Don N2VGU

I have found that the better resolution of 6,000 count DMMs are very useful in this regard.? ?This one: https://www.amazon.com/gp/product/B07SHLS639/ has? a millivolt scale, which, in conjunction

Much more sensible with the Flatten option turned off! Rather clean except for a couple of narrow birdies in the 20m FT8 spectrum.

Richard, in this state the Vdd rail gets the voltage from the analog regulator IC101. Vcc MUST be 0 V. No SMPS is working without firmware. If you see Vcc = 1.8 volts something is wrong with the

am looking at this QMX+ for a friend. I have a working QMX+. After completion he did the firmware download. He then removed power and then reapplied power. He then got the display: "Initializing

I started to have a look at the user manual as I will soon get my QMX. For? digital modes the com port is needed for CAT comands. What happens then with log or contest software which uses the cat

This is the first power up.? I didn't get a USB drive pop up on the computer.? I measured the voltages on the board with a DMV. So, no firmware yet. Thanks

Hi Petr, I am surprised that by +12V the +13.8V is assumed. This is +15%. I certainly hope that you are not operating the +3V3 device on +4V or the +5V device on +6V. It is "only" +20% and perhaps

Let me offer a second on this motion. Jeffrey runs a priceless shop. HIF

I built the QMX last month and have been trouble shooting it after a device on the SMPS smoked on initial start up. After replacing the boards, I could not get the menu to come, and the control board

I use these little variable buck converters from Ali Express. I haven't seen any measurable noise from them and they handle enough power for all my QCXs, QDX, and QMX. -- 73, Dan - W2DLC

Please join us Thursday (and every Thursday) at 4PM Eastern for the Michigan QRP Club weekly QRP Chat where the main topics will be QRP and other ham interests. It's fun, it's easy, and it's free. You

Absolute maximum rating - AMR that’s new to me. ?I must be getting too old. ?Or too forgetful. ?Or both!

Hmm… one bad device, maybe. Two bad devices, doubtful. Did the BS170s arrive in antistatic bags? [email protected]> wrote:

Thanks very much, Hans! I'll definitely take a look at that next. Your explanation aligns with not noticing this effect on my other analog radio that I've been using with WSJT-X. Greg, KB1UGP

Thanks, Chris. I am working right now, but based on a quick read, it sounds like the output end of the switching power supply side of the board is working as expected, based on 3.1V on the output.?

Dear Hans, thanks for info. I asked here to not bother you by email and got the reply from you anyway. :) I wonder about power supply AMR values as QCX Mini accepted even 13.8V (event it was tested

LIN_REG_EN is pulled high by R101, this turns Q110 on. Q101 is also on, which turns Q102 on which supplies power to the linear regulator.? This is what gets VDD to 3.1V. Q111 is off because it's gate

Sorry, Richard.? I did not read your whole message.? Yes, Vdd will affect Vcc. If you are reading this on the groups.io page, there is a Wiki on the left menu. In that, look for QMX QMX_plus