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Simple mistake: The micro usb connector was not soldered with all pins. (Units were supplied in June 2023). I have soldered an external micro usb with some short stranded wires to the board, now it

I'm primarily a sound engineer by trade and have some algorithms/code from some audio dsp I've written which I'm willing to share if desired

Hi Kees The 1N4148 diode in the 3.3V power supply is to isolate the 78M33 when the SMPS is being used and the 78M33 is off. Vdd and Vcc rails are NOT connected anywhere. The "Vdd" on

I was unsure of my ability to deal with SMD/SMT but got over it by getting a practice kit. It doesn’t do anything when you are done so you can’t destroy it. Put the parts on and take them off to

Recommendation is not to switch inductors while transmitting. Really pretty easy to peak up noise or signal on Rx, then just use Cin & Cout to fine tune. Rarely do you need to change inductor, but if

With my QDX I always tune my transmatch with a NanoVNA before plugging in the QDX. Doing so I am sure the QDX will be plugged in a transmatch plus antenna with less than 1.5 SWR. 73 - Pierre - FK8IH

Hi Group, I have a QCX 50W Amp with Case, Unassembled and unopened other than to look at the case parts.? $69 shipped to USA.? Please contact me directly with interest. Thanks and 73, Robert,

I found some info on this article which explains all V?? cases pretty good: https://m.aipulnion-power.com/news/10.html#:~:text=1.,2. 73 Barb WB2CBA

Hans, Yes, VDD vs VCC can get a little messy especially since the two appear to be connected together on the little IC402P/IC403P power pin schematic. My point was why is there not a 1N4148 blocking

The answer is: yes you can. It is part of the set-up for WSPR on the U3S. To set the clock you will need a clock that shows seconds. It can take a little practice to get close but anything less then

These are good, I have one I built and you can have one built by Emtech https://emtech-qrp.com/ Tom, W6TOM Links: ------ [1]

Again, watch a bunch of YouTube videos on hot air rework.? They will tell you temperature to use and LOTS more. Comments in (parentheses) are my opinions, and I Am Not An Expert. * Temperature

Hi Ronan, I had exactly the same problem, but luckily I was listening via a powered speaker at the time, so it limited the ear damage. I have stopped using my working QMX until AGC is implemented as

Rick wrote above: "I think the best approach here will be to rig up linear 3.3/5V supplies " Hello Rick and group, I have a similar tought on another thread in this group. Check for the message: Aug

At what temperature are you setting the hot air gun.? I have one but scared to use it. Thankfully there is no short on my PS board.. but the components and their associated solder blobs are so very

Be aware that those type of switched-element tuners subject the transmitter to massive mismatches during switching and finding a tuning solution.? I use one but I use a QRP-O-Meter absorptive bridge

Is there any news of AGC being added to the QMX transceiver some time soon? The reason I ask is that I just had a VERY painful experience using my freshly built QMX. The headphone output can suddenly

*Dear Bruce and all , Can I set my location info to U3S manually ?*

I do all my WSPR work at 200mW or less, using SOTABEAMS for the 200mW and the QRP-Labs U4B for 27mW. The overall objective of WSPR is that of low power. 200mW is almost excessive IMHO as some have

http://www.4sqrp.com/kits/4stuner/4stuner_panel.jpg ( http://www.4sqrp.com/kits/4stuner/4stuner_panel.jpg ) 45 bucks in a fun kit. Got one!