Amateur Radio Stack Exchange
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Questions tagged [ft8]

For questions specific to the FT8 mode

For questions specifically about the FT8 mode

32 questions
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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 with approximately 1 m of cable. I have made no…
David
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9
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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
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9
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2 answers

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
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8
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2 answers

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 and appended 14-bit CRC to precomputed message…
jemussi
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6
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2 answers

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 between mode and modulation, I thought they are the same thing? Aren't signals modulated in a single method, transmitted and then demodulation with a receiver with…
Dan
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6
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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 frequency.) Should you keep transmitting so he knows…
QuantumMechanic
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5
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What dot means in JTDX FT8 received messages?

What dot near country means in JTDX? Maybe LOTW?
dsicari
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5
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3 answers

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 returned: The odd thing is, noise is around 7 here…
hjf
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5
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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. They don't seem to be a noise created by stations…
Aleksander Alekseev - R2AUK
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5
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2 answers

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 impossible to set this call as 'mycall'; the call…
ON5MF Jurgen
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4
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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?
Pablo Fernandez
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4
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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: CQ HIMHIM EM00 HIMHIM MEMEME FN00 MEMEME HIMHIM -07 HIMHIM MEMEME R-09 HIMHIM MEMEME R-09 HIMHIM MEMEME R-09 (and then both sides…
QuantumMechanic
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4
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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 know what /R means. Are these real calls or maybe…
Aleksander Alekseev - R2AUK
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4
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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 mode? Cost is a factor, but simplicity of…
bcattle
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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.
MarqTwine
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