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WSPR freqs


 

Can anyone tell me the SCREEN DISPLAYED frequency by band for the QMX please when used in WSPR?

yes I’ve googled it, yes I’ve done all that stuff. I just want to hear what others think. I’m going bonkers now


 

Mine displays the freq that WSJT-X puts in for the band selected.
--
73
Karl
KI4ZUQ


 

Thanks Karl. You are running the QMX via wjst ?


 

If I understand you correctly, you're looking for the WSPR freqs for each band. Page 35 of the QMX operating manual lists them--or did you already know that? In any event I usually aim for a frequency somewhere between the extremes. For example on 20m I usually use something like 14.097.140. Beacon mode works perfectly provided all the parameters are set up right. Hope this helps. Mitch NK3H


 

Have a look here David,
I use a 6 band u3s running on 12v into a bank of 5v regulators, power out from 1w to 0.1w, can be heard worldwide, also lots of different modes available, also running a gps to set time and keep it on frequency.
Good bit of kit.
2200m: 0.137400 – 0.137600
600m: 0.475600 – 0.475800
160m: 1.838000 – 1.838200
80m: 3.570000 – 3.570200
60m: 5.288600 – 5.288800?
40m: 7.040000 – 7.040200
30m: 10.140100 – 10.140300
20m: 14.097000 – 14.097200
17m: 18.106000 – 18.106200
15m: 21.096000 – 21.096200
12m: 24.926000 – 24.926200
10m: 28.126000 – 28.126200
6m: 50.294400 – 50.294600
4m: 70.092400 – 70.092600
Andy
--
The universe is made up of Protons, Neutrons, Electrons but contains only one M0RON.


 

WSJT-X has a band/freq selection window lower left. These are click selectable on Windows 7 on up. Click on your choice and radio instantly displays the freq. I am sure you already know this but I state it to make sure we are on the same page of the same book!
--
73
Karl
KI4ZUQ


 

To be precise for transmitting WSPR on 20m:
the actual TX frequency must be inside the mentioned block for WSPR:
20m: 14.097000 – 14.097200 MHz

Now if we use the Beacon mode of a QMX machine then we have to choose the frequency exactly inside that band. For example 14.097130 MHz
But if you do the WSPR using for example the WSJT-X program then by choosing the WSPR mode you get set the 14.095600 MHz. To get the actual transmit frequency you have to add an offset set in the WSJT-X program. Normally this offset is set to 1500Hz. So if nobody changes that all WSPR transmissions would be at 14.097100 MHz. This would be very unfortunate. It is a very good practice to change this offset. For the mentioned example of the output frequency 14.097130 MHz the offset would have to be 1530 Hz.

--
73 Bojan S53DZ


 

To add to Bojan's comments a bit.
Using a radio like the U3S, which creates the "data" through direct frequency control, you set the frequency to the actual Tx frequency.
? In Bojan's example 14.097130 MHz
NOTE: some software picks the center tone, others pick an edge tone, but they are only a few Hz apart.

When using a radio in SSB tone and a computer application like WSJT-X that injects a "Tone" into a mixer with a suppressed carrier, the tone is between 1400 and 1600 Hz.
? So the radio displays 14.095600 MHz (in SSB - usually USB). WSJT-X shows a bar in the waterfall between 1400 and 1600 Hz (the WSPR window).
WSJT-X injects a audio Tone of 1530 Hz - seen on .
The actual signal is 14,095,600 Hz + 1530 = 14,097,130 MHz. => 14.097130 MHz.

To verify this, put the receiver in CW mode and set the waterfall to look for the signal.
The using the typical 800 Hz offset (or tone), your radio would be set to 14,096,330 or 14,097,930 depending on CW or CW-R setting to be on frequency.

I hope this helps!
-------
Rob KB8RCO