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14 votes
Accepted

What does CQ NM mean in FT8?

Now that I've seen a few other 2 letter abbreviations, I've figured out it means they're looking for a contact in New Mexico.
xxpor's user avatar
  • 331
7 votes
Accepted

Should I add call signs with /R suffix to the logbook?

FT8 decoding can use a technique called a priori (AP) whereby it uses naturally accumulating information for the purposes of increasing apparent sensitivity by about 4 dB. There is an increased chance ...
Glenn W9IQ's user avatar
  • 18.6k
6 votes

Why is SNR for FT8 defined using the noise power in the 2500 Hz channel containing the FT8 signal?

Matter of opinion, but it's kind of a "level playing field" thing. Say you want to compare the SNR required to have a successful QSO across SSB, conversational-speed CW, QRS(S) CW, and ...
hobbs - KC2G's user avatar
  • 12.6k
6 votes
Accepted

What does retain mean in the logging of WSJT-X 1.8.0?

When those boxes are checked, the values entered will be retained as the defaults for the next QSO to be logged. Unchecked, the fields will revert to blank.
Phil Frost - W8II's user avatar
5 votes
Accepted

Long callsigns in WSJT-X?

For the current "77-bit" versions of FT8 and MSK144 (as supported by wsjt-x version 2.0, released in late 2018, and newer), you can use these callsigns without doing anything special. Any combination ...
hobbs - KC2G's user avatar
  • 12.6k
5 votes
Accepted

If WSPR can go further than FT8, why do I only see local WSPR signals?

My guess, looking at WSPR reports, is that, on average (median), WSPR beacons are transmitted at power levels maybe in the range of 10 to 30 dB lower than the median of FT8 transmissions. e.g. 20 dBm ...
hotpaw2's user avatar
  • 13.5k
5 votes
Accepted

My radio and audio output keep changing using WSJTX on FT8

I'm not familiar with the failure modes of SignaLink devices, but in general, a USB device disappearing temporarily likely means that its internal microprocessor or USB interface chip has been reset, ...
Kevin Reid AG6YO's user avatar
  • 24.7k
5 votes
Accepted

wsjt-x problems with windows 11

With windows 11 there is a new feature "enhanced audio" Windows 11 provides additional features to improve the sound quality with more bass, virtual surround, room correction, and loudness ...
Paul Brennan's user avatar
3 votes

Can only use WSJTX in sudo

I would guess that your user is not in the dialout group. You can fix this with: sudo adduser your_user_name dialout Then log out and back in.
user3486184's user avatar
  • 1,957
2 votes
Accepted

Why is IC-7300 transmitting at zero power in "Rig" split mode with WSJT-X and FT8?

Short version of the answer: VFO B was USB, not USB-D. After manually changing VFO B to USB-D it worked. Longer version: I went back to testing this again and finally noticed that the mode indicator ...
QuantumMechanic's user avatar
2 votes

Should I add call signs with /R suffix to the logbook?

I agree with Glenn's answer about AP decodes since this V0 is an invalid callsign, but I'd like to add that in general /R on a callsign typically means it is a "Rover", or a mobile station ...
John's user avatar
  • 156
2 votes

Long callsigns in WSJT-X?

According to K1JT himself, the callsign field is rather restricted and must meet the same parameters as the one for JT65. https://sourceforge.net/p/wsjt/mailman/message/35254350/
mike65535's user avatar
  • 1,035
2 votes
Accepted

Why does Tone Spacing decrease with increasing T/R Periods in WSJT-X modes?

The longer T/R periods also have a longer duration for each symbol. The longer each symbol is, the more finely the decoder can resolve the frequency of each symbol. So the slower modes make narrower ...
hobbs - KC2G's user avatar
  • 12.6k
2 votes
Accepted

What do the WSJT-X split frequency options actually do under FT8?

Keep in mind that FT8 works in 15 second periods. After the station calls CQ in one 15 second period, it will be listening on the next 15 second period. So it is OK if you transmit your response on ...
gschro's user avatar
  • 369
1 vote

In WSJT-X my waterfall display is not showing any signals

I have an IC-7300 as well. The fact that rig control is working implies that you have the correct iCOM driver installed on your PC and that wsjt-x is configured for the correct serial port. The most ...
gschro's user avatar
  • 369
1 vote

What do the WSJT-X split frequency options actually do under FT8?

The one theory I have (other than "I just don't get how FT8 works") is that somehow the "Split" setting in WSJT-X controls how the split is implemented. That is, does WSJT-X ...
hobbs - KC2G's user avatar
  • 12.6k
1 vote
Accepted

FT8 not displaying

I found out that since I was using a not so well known radio, it didn't show up on the list of radios. So, it is using the microphone instead of the USB port for input. So, it seems like I can't use ...
o'o's user avatar
  • 594
1 vote

FT8 not displaying

it is possible that your clock is not set to the correct time. FT8 relies on signals starting at a precise time. if the clocks on the transmitter and receiver are not the same, the receiver will not ...
Jim's user avatar
  • 1,798
1 vote

Why is SNR for FT8 defined using the noise power in the 2500 Hz channel containing the FT8 signal?

It's arbitrary. As mentioned by hobbs, I would guess they used 2500 for direct comparison to other modes. But it's easy to change if we assume the noise is purely random. To find the SNR for a ...
pidloop's user avatar
  • 77
1 vote
Accepted

What AGC should I use in an Icom IC-705 when doing FT8 or other digital modes with WSJT-X?

Actually you can get AGC off on the 705. The process is a bit roundabout, but it's the same as the other Icom touchscreen radios. Set the mode you're interested in (i.e. USB-D for FT8) because AGC ...
hobbs - KC2G's user avatar
  • 12.6k
1 vote

Can only use WSJTX in sudo

Probably, some or all files are owned by root. Chown the files and change the ownership to yourself, for example.
Mike Waters's user avatar
  • 8,081
1 vote

WSJT-X integration with Ham Radio Deluxe not working for automatic logging

Apparently the answer was that my Ham Radio Deluxe was outdated. I found on that computer I was running an old version (not by much, maybe a month or two). Upgrading to v6.8.0.372 (13-Feb. 2023) fixed ...
Pablo Fernandez's user avatar
1 vote

IC7300 soundcard issues

Concerning how the Windows may connect the inputs ("Recording" channels) and the outputs ("Playback" channels), there are some ways you can hear the input channels in the output ...
ha3flt's user avatar
  • 111
1 vote

How to determine the problem with my FT8 TX in WSJT-X?

At long last, I got the radio to transmit just fine. At this point I'm using RigBlaster, although that's less because it was the solution and more because it's something I was trying along the way ...
Hack-R's user avatar
  • 255
1 vote

wsjt-x problems with windows 11

I think I may have fixed the problem, at least for my FT991a. I think the new update has made windows 11 a little too sensitive to being overdriven. I had to adjust settings on my RT to lower the RF ...
Albert Vadnais's user avatar

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