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WSPR allows a typical signal of 30db below the noise to be confirmed depending upon the decode engine used. 1 watt of WSPR = 1000 watts of SSB for a typical S1 signal of SSB. If you get a decode of

Doppler shift. That's is also why WSPR is crap when the path passes the polar zones. Haven't you noticed that the successful reported wspr paths tend to be only basic north and south or east to west

Good evening everyone, I agree with what Jerry wrote, the WSPR propagation does not determine the openings in SSB, I have a beacon on 6m with a QCX MINI modified by me and I noticed that when in

If you look in the audio domain, you have a two (or multi) tone signal. ?However in the RF domain, you see close to an almost pure single frequency RF waveform with nearly invisible frequency changes

Conversely, given sufficient bandwidth and precision of the IQ data stream it is possible to generate any arbitrary signal, or combination of signals, of any modulation types. 73, Don N2VGU

Motorola used to use a neon lamp in their VHF base station receivers at the RF input to ground.? Neon lamps usually start to conduct and light up at about 60 volts.? I wonder if that would

WSPR is great for determining propagation conditions for digital communications like FT8 but really isn't all that useful for determining if conditions are great for SSB voice, at least that's what

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