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Deciphering FT8

Posted: 13 Jul 2019 11:25
by simbeav
Using JTDX, if I get a line like :-

093000 -18 1.4 1326 ~ CQ IV3IYL JN65 where?

I assume I am receiving IV3IYL.

But when I get

092915 -14 1.7 2137 ~ HB9ETN EA4ZM 73 where?

Who am I actually receiving ?

And why does it always say Where? at the end ?

Sorry - I don't understand any of these hammy things.



Re: Deciphering FT8

Posted: 13 Jul 2019 11:36
by Jim (Bournemouth)
Hi Simon,
First decode - yes, it is IV3IYL from Italy calling CQ - his grid is JN65 in NE Italy.
Second decode - EA4ZM is sending his final transmission to HB9ETN.

I'm not sure why it says "where?" at the end - the program should know the transmissions are from Italy and Spain respectively.
I use JTDX and have the countries there as I would expect.

Any more questions, please ask.

Re: Deciphering FT8

Posted: 13 Jul 2019 11:43
by Jim (Bournemouth)
Some more examples:

103545 -3 0.4 835 ~ 4Z1UF EA5IAG IM97

Here, a Spanish station, EA5IAG in grid IM97 is calling 4Z1UF in Israel.

103445 -13 0.2 1573 ~ IU8JCQ EA5GPQ +07

In this one, EA5GPQ is giving IU8JCQ a signal report of +7db. That is pretty strong, most reports are in minus figures and those just detectable are at -20db or less.. I've had a -24 decode on occasions.

Re: Deciphering FT8

Posted: 13 Jul 2019 12:08
by pe1etr
Hello Jim and Simon
Just seen this. I've been using WSJT-X, is JTDX better?
I'm not a Ham either but I worked out it is the ham with the second callsign that I am receiving :)

Re: Deciphering FT8

Posted: 13 Jul 2019 14:43
by satnipper
Ham conventions is always station A de (from) Station B

Re: Deciphering FT8

Posted: 13 Jul 2019 22:10
by simbeav
Thanks Jim.

Very informative. I thought I would just have a play to see what I could pick up, but just wasn't sure which callsign was the transmitter.

All clear now.