Deciphering FT8

General Discussion
Post Reply
simbeav
Posts: 868
Joined: 14 Oct 2014 15:00

Deciphering FT8

Post by simbeav » 13 Jul 2019 11:25

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.

Thanks

Simon

Jim (Bournemouth)
Posts: 382
Joined: 18 Sep 2014 05:59
Location: Bournemouth, Dorset IO90BR
Contact:

Re: Deciphering FT8

Post by Jim (Bournemouth) » 13 Jul 2019 11:36

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.
Jim, Bournemouth, Dorset. IO90BR.

Elad FDM-S2, Perseus/FM+, Airspy HF+, SDRPlay, Funcube Dongle SDR Rx; 8-ele OP-DES for Band 2, 8-ele LFA 2m, 3 ele LFA for 6m, 20/15/10m dipole, VHF vertical
.

Image

Jim (Bournemouth)
Posts: 382
Joined: 18 Sep 2014 05:59
Location: Bournemouth, Dorset IO90BR
Contact:

Re: Deciphering FT8

Post by Jim (Bournemouth) » 13 Jul 2019 11:43

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.
Jim, Bournemouth, Dorset. IO90BR.

Elad FDM-S2, Perseus/FM+, Airspy HF+, SDRPlay, Funcube Dongle SDR Rx; 8-ele OP-DES for Band 2, 8-ele LFA 2m, 3 ele LFA for 6m, 20/15/10m dipole, VHF vertical
.

Image

pe1etr
Posts: 1796
Joined: 07 Oct 2014 00:40
Location: Blackpool, UK

Re: Deciphering FT8

Post by pe1etr » 13 Jul 2019 12:08

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 :)
Peter

satnipper
Posts: 1179
Joined: 03 Oct 2014 12:58
Location: Western Europe

Re: Deciphering FT8

Post by satnipper » 13 Jul 2019 14:43

Ham conventions is always station A de (from) Station B

simbeav
Posts: 868
Joined: 14 Oct 2014 15:00

Re: Deciphering FT8

Post by simbeav » 13 Jul 2019 22:10

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.

Post Reply

Return to “Low VHF”