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Check that there is no short in this circled location.? Also, this IC is a little skewed to the right, make sure all of its pins are nicely connected to the pads. This is the most likely area of

Hello all, I have a 40m qcx+ and a qlg1, both working great together on wspr for several years now. Well, that until I went ahead and put my qlg1 in a new enclosure, on top of that I removed the 3mm

Don If you would like to try signal tracing Here is a? very nice PC soundcard oscilloscope for win XP and above As you know surface mount components are packed tight Be careful probing I use a hat

Yes, but in the RF domain you need frequency and amplitude. 73, Willie N1JBJ

Voltage on C406 is 2.42V so I guess its correct. Just in case I will rewind T401 trifilar transformer in case there is a shortage inside winding. --------------------------------- 73 de Marek SP9TKW

Hi John, From research undertaken seems that WSPR on upper VHF bands for DX propagation is not very effective. Have found more than one study / paper that arrives at the same conclusion. 73 Nigel

Excepting xtal filter group delay params. That's why SSB always has that SSB sound, unless you're using a DC RX ;-) -- - 73 de Andy -

Surely this just amounts to creating? at any given point in time only one sampled frequency and then switching to another fast enough in order to give the effect of two or more simultaneous tones

Well I have tried all the suggestions, quadruple checked the solder joints. There is NO sound other then the initial click at power up. It will work fine on Ft8. With FLdigi I can decode CW. The

Or for those of us in the U.S.:

When I was writing my Teensy version of the uSDX I thought one day I would inject a perfect two tones programmatically and learn some things about the Si5351 frequency generation algorithms but much

Fake news.

So this was a totally self inflicted event, but I blew the PWR_HOLD port on the CPU. I don't particularly like the flex the left part of the control board has when pressing on the left encoder so was

Andre, quite simply because GPT4 is beyond awesome and could be of great assistance in programming SDR Transceivers like the QMX but nobody seems to have understood it's capabilities which is a

Useful for probing short timescale propagation. WSPR needs 2 min, FT8 15 sec.? Sporadic-E often fades very quickly :-(? Tropo is more likely to support WSPR. FT4 as well !?? (might also catch some

If Q507 is being driven linearly then I hope it has good heat sinking. I would have thought that in order to keep the efficiency benefits if class E you'd want to switch the uc pin driving that

Without knowing your lighting conditions no one can say. ? Certainly the base designs run the backlight as ‘hot’ as possible and possibly above the backlight LED ratings in some sets/supply

This is sort of the equivalent of saying "but a DAC can only produce one voltage at a time, how can you reproduce an entire waveform that way?" The magic happens when you do it many thousands of

My totally uninformed guess is that it might come down to being an advantage of the Tayloe mixer used in the QMX over the RF sampling ADC used in the 7300.

Chris, Maybe the QMX is simply better. But I would carry out an extended test simultaneously on one antenna with a splitter. I've done that many times using WSPR. Even then I find results are not