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In the simple case of two simultaneous tones, you are not modulating frequency at all. You can produce two tones solely through amplitude modulation. Think about the spectrum of an AM signal - an AM

Hello Chuck, I just noticed your message. I am trying to get my QDX-M to work with andFLmsg on an android phone, so a different application from you. I might however be able to solve the first part of

Also if one of the secondary windings is reversed it may cause the problem.

You've probably already done it but I would check continuity from IC 402 pin 7 to IOC 403 pins 7 and 9. And to ground ~5k ohm

After looking again, it looks like the pin on the far left may not be hitting the pad at all -- Bruce

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