Questions tagged [ft8]
For questions specific to the FT8 mode
16
questions
2
votes
0answers
37 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 ...
8
votes
1answer
119 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 ...
5
votes
1answer
188 views
5
votes
3answers
352 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 ...
5
votes
2answers
720 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. ...
1
vote
1answer
204 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 ...
1
vote
1answer
68 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...
6
votes
1answer
378 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? The followed the NM with their call and grid as usual.
2
votes
1answer
1k 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 ...
4
votes
2answers
601 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 ...
4
votes
1answer
2k 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.
1
vote
1answer
148 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 ...
3
votes
1answer
344 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.
4
votes
2answers
663 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 ...
4
votes
1answer
114 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?
8
votes
2answers
365 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?
