Questions tagged [ft8]
For questions specific to the FT8 mode
31
questions
4
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1
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171
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What does <...> mean in FT8?
I caught this in FT8, did someone just enter <...> as their call sign or is this code for something?
- 1,381
2
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0
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299
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wsjt-x problems with windows 11 Icom 7300 USB sound hangs
Description of problem:
WSJT and JTDX both stop receiving sound after about 2-3 hours when running on Win 11 with ICom 7300.
This did not happen with my Raspberry Pi running the same rig.
The ...
- 21
1
vote
2
answers
77
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Can only use WSJTX in sudo
I am trying to use WSJT-X to make FT8 Contacts on Pop! OS (Ubuntu-based) and with an IC-7300. I entered all the correct settings into WSJT-X, but it could not connect to my transceiver, and WSJT-X ...
- 33
6
votes
2
answers
453
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How is FT8 modulated with both upper side band and FSK?
This Wiki shows FT8 mode is USB and its modulation is FSK.
I don't get the difference ...
- 311
1
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1
answer
487
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How to determine the problem with my FT8 TX in WSJT-X?
I am trying to QSO on 17m, 20m, 40m, and 160m with an IC-756PRO.
I’m using WSJT-X in FT8 mode via a CI-V for CAT control and SignaLink for audio. System sound settings appear correct. Control tests of ...
- 255
2
votes
2
answers
118
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Fox & Hound or regular FT8 for ARRL International Digital Contest?
So I'm thinking about casually working the ARRL Int'l Digital contest this weekend to try to pick up (hopefully they'll confirm!) a couple of new DCXX entities so I can get my DXCC (almost there).
...
- 913
1
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3
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541
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Linux Alternative Time Sync-ing for JS8 or FT8
I was learning about the time drift set and correct features of JS8Call and wondering about an alternative.
Assume I have a wrist watch that loses 1 second a month and that it's been sync-ed to an NTP ...
- 301
3
votes
2
answers
224
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Can someone without privileges on a band operate FT8 on it using the callsign of a ham who does and is present?
I have an Extra license. Is it legal for my dad (who has a Technician license) or my mom (who is not licensed) to operate FT8 on 20 meters using my call sign, if I am physically present at the control ...
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2
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6k
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wsjt-x problems with windows 11
When upgrading from previous version of the windows operating system to windows 11 wsjt-x stops receiving the output from the radio. What should I look for?
- 203
4
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2
answers
324
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How do you log (or not) "busted" FT8 QSOs?
When do you decide (when NOT in a contest) to log an "incomplete" FT8 QSO? For example, something like this:
...
- 913
6
votes
2
answers
662
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FT8 etiquette when no reply after responding to CQ?
When you respond to an FT8 CQ and the other side doesn't respond after a couple of your transmissions, what is proper etiquette? (Assuming you're working split and not transmitting on his receive ...
- 913
3
votes
1
answer
1k
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Why is IC-7300 transmitting at zero power in "Rig" split mode with WSJT-X and FT8?
I am successfully running FT8 with WSJT-X on Windows 10 with my IC-7300. I am using IC-7300 as the rig.
On reading the official WSJT-X User Guide (and various ...
- 913
10
votes
2
answers
3k
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Am I really receiving FT8 signals from 12,000 km away on 144 MHz?
I have been using an Ettus B200 SDR to receive FT8 transmissions in the 2-meter band (144.174 MHz) using the WSJT-X software. Signals are received using a telescopic antenna inside on a window ledge ...
- 286
0
votes
1
answer
87
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FT8 in slow motion?
Do FT8 operators typically respond to very late replies for an entire QSO? (for instance, transmitting in the 3rd slot or 5th slot after a CQ, to maintain even/odd alternation, instead of the time ...
- 13.2k
3
votes
1
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406
views
If WSPR can go further than FT8, why do I only see local WSPR signals?
I've been scanning through the bands using WSJT-X to pick up FT8 and WSPR. Using a VHF discone, I decode messages from nearly 10,000 km away, consistently, when listening for FT8. But when switching ...
- 163
3
votes
1
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160
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FT8 low-density parity check code
The FT8/FT4 communication protocols use an 83x91 generator matrix for the low-density parity check code. I am interested in MATLAB recasting of portions of these protocols. Can anyone explain to me ...
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8
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2
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589
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FT8 callsign/maidenhead compression encoding
I have set myself a challenge to write a Matlab script as proof of concept to send an FT8 CQ call (not necessarily for live transmissions yet, but I may extend the project). So far I have:
Generated ...
- 83
5
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1
answer
940
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5
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3
answers
1k
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Only noise, no signals whatsoever on HF
Last night there was a power outage at home. I was able to see a LOT of stations on 20M (FT8). As soon power returned, all of them disappeared. You can see in the waterfall very clearly when power ...
- 1,199
5
votes
3
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1k
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Unidentified signals on FT8 frequencies
When I work in FT8 mode I often see signals like these:
I couldn't identify these signals using SigiWiki nor managed I to decode them using WSJT-X. Though these signals seem to use 15 second frames. ...
4
votes
2
answers
1k
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Should I add call signs with /R suffix to the logbook?
Sometimes in FT-8 mode I receive calls like this one:
It happens 2-3 times a week.
The problems are: 1) I never could look up such call signs 2) I tried to reply, but never got answer 3) I don't ...
1
vote
1
answer
77
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How many HF (FT8/JT65/BPSK/RTTY etc) amateurs are active in Canada? [closed]
It's silent over there... USA is full of FT8 stations, in Canada you can count them on one hand and you don't even need all your fingers...
9
votes
1
answer
802
views
What does CQ NM mean in FT8?
I saw someone on 20m FT8 this morning calling "CQ NM". What does NM mean in this context? They followed the NM with their call and grid as usual.
- 331
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5k
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WSJT-X V2: How to identify stations already logged?
In V1.9 of WSJT-X, there was a feature that allowed one to change the color of stations already logged. This was necessary in knowing whether or not to respond to a given CQ.
In version 2, I am ...
- 181
4
votes
2
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2k
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What is the minimum equipment necessary to get on the air with FT8?
To the extent that FT8 is a way to bring people into the hobby or re-ignite passion among those who haven't been on the air in a while, what's the easiest way to get someone on the air with this new ...
- 255
4
votes
1
answer
4k
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Can the IC-7300 be connected straight to a computer and use WSJT-X for FT8?
Do I need a separate device to use digital modes with the IC-7300 or do I just need to connect the 7300 to my computer via USB in order to use WSJT-X for FT8?
Thank you.
- 181
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1
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257
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Can WSJT-X's timing account for delay from RCForb?
I was using FT8 through a remote in RCForb. Reception in FT8 is spotty through the remote. I do not have an HF rig to test if the remote is the problem. So far, I think it is the delay through the ...
- 13
3
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1
answer
375
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How/where can I learn about ft8? [closed]
Where can I find information about the digital modes and how to get started on them? I would like a concise yet easy to understand tutorial.
5
votes
2
answers
2k
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Long callsigns in WSJT-X?
During the month of May (2018) a lot of Belgian club stations can use callsigns in the format OT70xxx. (The xxx is always 3 letters, for example our club station uses OT70TRA.)
In WSJT-X it seems ...
- 803
4
votes
1
answer
193
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What does retain mean in the logging of WSJT-X 1.8.0?
If you have automatic prompt for logging on WSJT-X, at the end, you get this dialog:
What does the "Retain" checkboxes do when you check them?
- 1,381
9
votes
2
answers
640
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What does exclamation mark mean in FT8 CQ calls in WSJT?
For example, in this screenshot:
WSJT shows !Italy, !Serbia, !U.S.A. What does it mean?
- 1,381