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This is a quick scribble of the power: These are the parts I used: 12-5 Buck https://www.amazon.com/dp/B07P663XJV/ref=pe_830720_114782560_TE_FOCE_n_id?th=1 3S charger

My battery system uses 3 x 18650 with a USB-C charge board and BMS. I'll scribble a drawing of what I've done when I get a moment.

Will do....? My plan is to use one of these amp modules. ( https://www.aliexpress.com/item/1005006759490856.html?spm=a2g0o.order_list.order_list_main.29.51571802uzN0gF ) These are speakers I'm

Hello Simone, I guess yes. But there are some more parts around Q507. Could you measure please voltage at S, G and D of Q507 in RX mode. 73, Ludwig

We had 13 folks attend last weeks MI QRP chat. The topic of the week was - What rig do use the most for QRP? Jim”s QRP ring was K2. He uses a 41 foot half wave antenna and likes to hunt POTA with

Hi, While testing this midband QMX, I noticed that PA Voltage is always present, even in RX. The QMX can happily put out almost 5 watts? in 60, 40 30 and a little less in 17 and 15, so the PA itself

I've given all the joints a work over now and everything is working properly now. The OM that taught me to solder (my Dad) would be very disappointed in those joints! Thanks for your help Nick

John, This doesn't appear to have been a problem on QDX, but only because uncontrolled parasitics, which are part of that circuit too, had not wandered into the zone. It was probably only a matter

When disconnected from the main board and 7.5 volts and ground supplied at the connector on my malfunctioning 3.3V power supply, the voltages on Q111 are drain 3.1V source 2.38V gate 3.71 volts I

Trying to get on JS8 with my QDX and cannot seem to find a suitable radio option as one would use with FT8. Anyone know what the deal is? Thanks in advance! -- William,

Hi John, Thanks, that certainly clears things up a bit.? When I adjust the turns spacing -5dB seems to be about the high water mark so I'll just leave it there for now. For reference, this is a QDX

I haven't finished assembling my QMX yet but I am very happy with my Antuner AT100-M (I have the non-pro version) with my tr(u)SDX and figured I'd add it to the mentions in this

Agreed, the excess solder makes it difficult to properly inspect the joint.? You only need enough solder to fill the joint, ideally the outline of the wire and the terminal should be visible. Here

Guys see the statistics from my recent completed QMX+ Any suggestions on how to sort out the bad Audio filters/Image Sweeps on 160 and 6 meters.? I checked the BPF's and made sure they are soldered

John, Early on in the life of QMX it was discovered that the use of a multi tapped toroid combined with the existence of parasitic capacitance at every tap point set up a narrow rogue resonance that

Hello, I am thinking of getting a QMX+ 160-6m multiband multimode 3-5W QRP Transceiver.? I think it would be a great radio for the beach or my own mini-field day in a park or my back porch. I see

Thanks, Ron for the suggestions.? I thought I'd scraped enough enamel off originally; perhaps not. I put it back in its case for now and will give it another look this week. - Bill? W3WJ

Thanks for the caution warning, Ludwig. I returned it to the 60-15 config and to its case after some more unproductive fiddling. I'll just life without 60 and 40 on the radio for now. - Bill W3WJ

Adjusting the coils on the 20m low pass filter (L2 and L6) doesn't seem to have an impact on the RF sweep.? I've shuffled the coils on the BPF toroid (L12) so that the filter is only at -5dB around

Yes, that solder could use a little touch up, but that is PWM_3V3, which is not active in the linear mode. I will retouch it, though. This test was done with the power supply in isolation.? Only