Skip to main content

Questions tagged [ft8]

For questions specific to the FT8 mode

Filter by
Sorted by
Tagged with
0 votes
2 answers
79 views

FT8 not displaying

Why can't I decode the FT8 when using WSJT-X on HF? At first, it decoded one but then, nothing showed up. I didn't change anything. I can still hear the FT8 signals clearly but the software won't ...
o'o's user avatar
  • 513
3 votes
1 answer
90 views

Help implementing FT8 crc check in Rust

I'm playing around with implementing portions of the FT8 protocol in Rust. I'm having trouble with the CRC algorithm. Here is my not yet working attempt: https://gist.github.com/JohnRudolfLewis/...
JohnRudolfLewis's user avatar
4 votes
2 answers
149 views

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

I see the term "SNR_2500" is often use to make it clear. Is it useful to use this SNR definition in some contexts? Is this kind of convention used in other digital modes or communication ...
gschro's user avatar
  • 157
4 votes
1 answer
375 views

What does <...> mean in FT8?

I caught this in FT8, did someone just enter <...> as their call sign or is this code for something?
Pablo Fernandez's user avatar
2 votes
0 answers
511 views

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 ...
Peter Burke's user avatar
1 vote
2 answers
123 views

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 ...
owabs's user avatar
  • 33
6 votes
2 answers
690 views

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 ...
Dan's user avatar
  • 311
1 vote
1 answer
868 views

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 ...
Hack-R's user avatar
  • 255
2 votes
2 answers
154 views

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). ...
QuantumMechanic's user avatar
1 vote
3 answers
831 views

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 ...
wbg's user avatar
  • 301
3 votes
2 answers
259 views

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 ...
Someone's user avatar
  • 604
1 vote
2 answers
8k views

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?
Paul Brennan's user avatar
4 votes
2 answers
380 views

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: ...
QuantumMechanic's user avatar
6 votes
2 answers
845 views

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 ...
QuantumMechanic's user avatar
3 votes
1 answer
1k views

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 ...
QuantumMechanic's user avatar
10 votes
2 answers
3k views

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 ...
David's user avatar
  • 286
0 votes
1 answer
93 views

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 ...
hotpaw2's user avatar
  • 13.5k
3 votes
1 answer
483 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 ...
directedition's user avatar
3 votes
1 answer
202 views

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 ...
Gerald Lemay's user avatar
8 votes
2 answers
677 views

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 ...
jemussi's user avatar
  • 83
5 votes
1 answer
1k views

What dot means in JTDX FT8 received messages?

What dot near country means in JTDX? Maybe LOTW?
dsicari's user avatar
  • 153
5 votes
3 answers
1k views

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 ...
hjf's user avatar
  • 1,219
5 votes
3 answers
1k views

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. ...
Aleksander Alekseev - R2AUK's user avatar
4 votes
2 answers
1k views

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 ...
Aleksander Alekseev - R2AUK's user avatar
1 vote
1 answer
78 views

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...
Patrick Verschuren's user avatar
9 votes
1 answer
855 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.
xxpor's user avatar
  • 331
3 votes
2 answers
6k views

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 ...
MarqTwine's user avatar
  • 191
4 votes
2 answers
2k views

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 ...
bcattle's user avatar
  • 255
4 votes
1 answer
4k views

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.
MarqTwine's user avatar
  • 191
1 vote
1 answer
260 views

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 ...
R. Levisky's user avatar
3 votes
1 answer
375 views

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.
Kenneth Harris's user avatar
5 votes
2 answers
2k views

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 ...
ON5MF Jurgen's user avatar
4 votes
1 answer
204 views

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?
Pablo Fernandez's user avatar
9 votes
2 answers
677 views

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?
Pablo Fernandez's user avatar