Re: [wsjt-devel] FT8: Potential new mode for fast QSOs

[John Nelson]

Hi Joe, Steve and Bill,

FT8 busy on 20m this afternoon.  r7752 operational on Mac OSX 10.11 without 
problems…

— John G4KLA
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Re: [wsjt-devel] FT8: Potential new mode for fast QSOs

[Bill Somerville]

On 30/06/2017 02:24, Roger Rehr W3SZ wrote:
Bill G4WJS had given a warning on June 9 to "Beware if building from 
development sources" with revisions later than r7703, due to some 
transmission modulation issues.


Given the recommendations for us to try JT8 and the great enthusiasm 
being shown for it by users now running r7750 or later, is it safe to 
assume that that warning has been lifted?


I looked for an email rescinding the warning but couldn't find one.

Or is the current recommendation that we run r7750 or later version 
for JT8 BUT r7703 or earlier for other modes?


Hi Roger,

Steve, K9AN, fixed an issue with MSK144 modulation at r7732 
(https://sourceforge.net/p/wsjt/wsjt/7732/) which fixed the outstanding 
problem as far as I know.


73
Bill
G4WJS.


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Re: [wsjt-devel] FT8: Potential new mode for fast QSOs

[Fábián Tamás László]

...build went like a breeze, just did an svn co and followed 
instructions in INSTALL. (Revision 7752)


I might be able to try the new mode tonight around 2230 UTC

Cheers,

Tamas HA5FTL

2017-06-29 20:47 keltezéssel, Tamás Fábián írta:
I'm going to try and compile it on Ubuntu 17.04 "zesty" (Linux 
4.10.0-26-generic x86-64) at next weekend.


If someone happens to be faster, and can send me a binary, I'll surely 
be on the air ;)


Cheers,

Tamas HA5FTL

2017-06-29 20:32 GMT+02:00 George J Molnar >:


Compiled and run without incident on Mac OS 10.12.6 (beta).
Monitored signal quality seems good.

No contacts… yet!


*George J Molnar*
Nevada, USA
KF2T  @GJMolnar






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Re: [wsjt-devel] FT8: Potential new mode for fast QSOs

[Roger Rehr W3SZ]

Bill G4WJS had given a warning on June 9 to "Beware if building from
development sources" with revisions later than r7703, due to some
transmission modulation issues. 

Given the recommendations for us to try JT8 and the great enthusiasm
being shown for it by users now running r7750 or later, is it safe to
assume that that warning has been lifted?

I looked for an email rescinding the warning but couldn't find one.

Or is the current recommendation that we run r7750 or later version for
JT8 BUT r7703 or earlier for other modes?

Thanks in advance, and

73,

Roger Rehr
W3SZ


> If you can build WSJT-X from source code revision r7750

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Re: [wsjt-devel] FT8: Potential new mode for fast QSOs

[signalhz signalhz]

Is this a linux version or mac?

Get Outlook for iOS<https://aka.ms/o0ukef>

From: David Tiller <dtil...@captechconsulting.com>
Sent: Thursday, June 29, 2017 5:02:35 PM
To: WSJT software development
Subject: Re: [wsjt-devel] FT8: Potential new mode for fast QSOs

Gary,

Ask and ye shall receive! I uploaded an unofficial OSX build of 7752 to my 
google drive here: https://drive.google.com/open?id=0B4DphHV_ItCZbjZDdmt2NnR2cHc

Enjoy & 73 de K4DET
On Jun 29, 2017, at 7:43 PM, C. Gary Rogers <dc4aac...@comcast.net> wrote:

> Would love you give it a try if there is a OS X version somewhere…Gary KO3F
>
>> On Jun 29, 2017, at 7:28 PM, Laurie, VK3AMA <_vk3a...@vkdxer.net> wrote:
>>
>>
>>
>> On 30/06/2017 9:10 AM, Joe Taylor wrote:
>>> Is anyone using "T10"? When I've checked recently, usage seemed to be close 
>>> to zero.
>>>
>>> In any eveny, we had no idea that "~" was being used to flag a T10 decode.  
>>> (Or, for that metter, that you were using those flags in JTAlert.)
>>>
>>> Maybe you can tell it's FT8 because I (mistakenly) left two spaces between 
>>> "~" and the start of message, rather than one. :-)
>>>
>>>   -- Joe, K1JT
>>
>> Joe,
>>
>> The 2 spaces hack is not really suitable, since JTAlert uses the mode field 
>> passed in the UDP decode packet. I'd rather not code a fix based on a source 
>> code error that will likely be corrected in the future.
>>
>> A JTAlert fix is rather trivial, as I already know if the UDP packet is 
>> coming from WSJT-X or JTDX, so its a simple application test to determine 
>> the true mode.
>>
>> I'll be posting a new JTAlert later today with the fix.
>>
>> Regarding T10 usage, there is only a small number of users, primarily EU 
>> based. I have not seen any significant uptake of the mode, there appears to 
>> be only a small number of regular spotters of the mode.
>>
>> de Laurie VK3AMA
>>
>>
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Re: [wsjt-devel] FT8: Potential new mode for fast QSOs

[Greg Beam]

Hi Bill,

I tried to connect with you a couple times, but I wasn't making it in on
your side. I think the best I had you was ~ -16gb or so, maybe a little
better.

Looks like us HF sloth's are gonna have to learn how to operate VHF high
speed mode :-)

G.

On Thu, Jun 29, 2017 at 5:17 PM, Bill Somerville 
wrote:

> On 30/06/2017 00:15, Greg Beam wrote:
>
>> I just decoded Joe working Bill. All be it, I did not decode Bill.
>>
>
> Hi Greg,
>
> I am only running 3W. If you want a QSO I can QRO a bit.
>
> 73
> Bill
> G4WJS.
>
>
>
> 
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Re: [wsjt-devel] FT8: Potential new mode for fast QSOs

[Greg Beam]

Here's an issue "I think".

If you set (check) auto-seq, then, during the QSO, set a different response
than what it expects, say 73's instead of the RRR message, WSJT-X
automatically sends the report message message if the other station sent a
report instead of RRR. I got caught in a do-loop with I3VJW. I wanted to
send RR or 73's, but the sequencer kept sending me back to the call +
report.

G.



On Thu, Jun 29, 2017 at 5:28 PM, Laurie, VK3AMA <_vk3a...@vkdxer.net> wrote:

>
>
> On 30/06/2017 9:10 AM, Joe Taylor wrote:
>
>> Is anyone using "T10"? When I've checked recently, usage seemed to be
>> close to zero.
>>
>> In any eveny, we had no idea that "~" was being used to flag a T10
>> decode.  (Or, for that metter, that you were using those flags in JTAlert.)
>>
>> Maybe you can tell it's FT8 because I (mistakenly) left two spaces
>> between "~" and the start of message, rather than one. :-)
>>
>> -- Joe, K1JT
>>
>
> Joe,
>
> The 2 spaces hack is not really suitable, since JTAlert uses the mode
> field passed in the UDP decode packet. I'd rather not code a fix based on a
> source code error that will likely be corrected in the future.
>
> A JTAlert fix is rather trivial, as I already know if the UDP packet is
> coming from WSJT-X or JTDX, so its a simple application test to determine
> the true mode.
>
> I'll be posting a new JTAlert later today with the fix.
>
> Regarding T10 usage, there is only a small number of users, primarily EU
> based. I have not seen any significant uptake of the mode, there appears to
> be only a small number of regular spotters of the mode.
>
> de Laurie VK3AMA
>
>
>
> 
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Re: [wsjt-devel] FT8: Potential new mode for fast QSOs

[C. Gary Rogers]

Would love you give it a try if there is a OS X version somewhere…Gary KO3F

> On Jun 29, 2017, at 7:28 PM, Laurie, VK3AMA <_vk3a...@vkdxer.net> wrote:
> 
> 
> 
> On 30/06/2017 9:10 AM, Joe Taylor wrote:
>> Is anyone using "T10"? When I've checked recently, usage seemed to be close 
>> to zero.
>> 
>> In any eveny, we had no idea that "~" was being used to flag a T10 decode.  
>> (Or, for that metter, that you were using those flags in JTAlert.)
>> 
>> Maybe you can tell it's FT8 because I (mistakenly) left two spaces between 
>> "~" and the start of message, rather than one. :-)
>> 
>>-- Joe, K1JT 
> 
> Joe,
> 
> The 2 spaces hack is not really suitable, since JTAlert uses the mode field 
> passed in the UDP decode packet. I'd rather not code a fix based on a source 
> code error that will likely be corrected in the future.
> 
> A JTAlert fix is rather trivial, as I already know if the UDP packet is 
> coming from WSJT-X or JTDX, so its a simple application test to determine the 
> true mode.
> 
> I'll be posting a new JTAlert later today with the fix.
> 
> Regarding T10 usage, there is only a small number of users, primarily EU 
> based. I have not seen any significant uptake of the mode, there appears to 
> be only a small number of regular spotters of the mode.
> 
> de Laurie VK3AMA
> 
> 
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Re: [wsjt-devel] FT8: Potential new mode for fast QSOs

[Dan Malcolm]

The Log4OM Forum is currently off line, or I would not bother you guys, and
feel free to tell me to suck it up.  Is there a way to get Log4OM to accept
the FT8 mode?

-Original Message-
From: Laurie, VK3AMA [mailto:_vk3a...@vkdxer.net] 
Sent: Thursday, June 29, 2017 6:28 PM
To: wsjt-devel@lists.sourceforge.net >> WSJT software development
<wsjt-devel@lists.sourceforge.net>
Subject: Re: [wsjt-devel] FT8: Potential new mode for fast QSOs



On 30/06/2017 9:10 AM, Joe Taylor wrote:
> Is anyone using "T10"? When I've checked recently, usage seemed to be 
> close to zero.
>
> In any eveny, we had no idea that "~" was being used to flag a T10 
> decode.  (Or, for that metter, that you were using those flags in
> JTAlert.)
>
> Maybe you can tell it's FT8 because I (mistakenly) left two spaces 
> between "~" and the start of message, rather than one. :-)
>
> -- Joe, K1JT

Joe,

The 2 spaces hack is not really suitable, since JTAlert uses the mode field
passed in the UDP decode packet. I'd rather not code a fix based on a source
code error that will likely be corrected in the future.

A JTAlert fix is rather trivial, as I already know if the UDP packet is
coming from WSJT-X or JTDX, so its a simple application test to determine
the true mode.

I'll be posting a new JTAlert later today with the fix.

Regarding T10 usage, there is only a small number of users, primarily EU
based. I have not seen any significant uptake of the mode, there appears to
be only a small number of regular spotters of the mode.

de Laurie VK3AMA



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Re: [wsjt-devel] FT8: Potential new mode for fast QSOs

[Laurie, VK3AMA]

On 30/06/2017 9:10 AM, Joe Taylor wrote:
Is anyone using "T10"? When I've checked recently, usage seemed to be 
close to zero.


In any eveny, we had no idea that "~" was being used to flag a T10 
decode.  (Or, for that metter, that you were using those flags in 
JTAlert.)


Maybe you can tell it's FT8 because I (mistakenly) left two spaces 
between "~" and the start of message, rather than one. :-)


-- Joe, K1JT 


Joe,

The 2 spaces hack is not really suitable, since JTAlert uses the mode 
field passed in the UDP decode packet. I'd rather not code a fix based 
on a source code error that will likely be corrected in the future.


A JTAlert fix is rather trivial, as I already know if the UDP packet is 
coming from WSJT-X or JTDX, so its a simple application test to 
determine the true mode.


I'll be posting a new JTAlert later today with the fix.

Regarding T10 usage, there is only a small number of users, primarily EU 
based. I have not seen any significant uptake of the mode, there appears 
to be only a small number of regular spotters of the mode.


de Laurie VK3AMA


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Re: [wsjt-devel] FT8: Potential new mode for fast QSOs

[Bill Somerville]

On 30/06/2017 00:10, Joe Taylor wrote:
Maybe you can tell it's FT8 because I (mistakenly) left two spaces 
between "~" and the start of message, rather than one. :-)


Hi Joe & Laurie,

I would take that as a joke! It will have to change as too much relies 
on the exact positioning of the message in the decode line.


Tnx QSO Joe, I was beginning to think I was Transmitting into my dummy load.

73
Bill
G4WJS.


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Re: [wsjt-devel] FT8: Potential new mode for fast QSOs

[Dan Malcolm]

I am also having problems with logging.  FT8 is not recognized (yet).  I
listed it as 'SSB' and put "Mode=FT8" in the remarks, but that is just a
stop gap measure.  Log4OM initially accepted but then rejected FT8, and I
haven't found a way to make that acceptable to Log4OM.  I have to say though
that I am very pleased with the auto-sequencing.

-Original Message-
From: Laurie, VK3AMA [mailto:_vk3a...@vkdxer.net] 
Sent: Thursday, June 29, 2017 5:36 PM
To: WSJT software development <wsjt-devel@lists.sourceforge.net>
Subject: Re: [wsjt-devel] FT8: Potential new mode for fast QSOs



On 30/06/2017 7:41 AM, Dan Malcolm wrote:
> I also notice that there is a
> tilde between "Freq" and "Message" in the "Band Activity" window.  Is 
> that an FT8 encoding indicator or a place holder?

The "~" mode character will be a problem. It is the character chosen by JTDX
for the T10 mode and would explain an earlier message that indicated that a
FT8 spot on HamSpots appeared as T10 (likely came from JTAlert which spots
"~" decodes as T10).

de Laurie VK3AMA



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Re: [wsjt-devel] FT8: Potential new mode for fast QSOs

[Joe Taylor]

Hi Laurie,

On 6/29/2017 6:35 PM, Laurie, VK3AMA wrote:
The "~" mode character will be a problem. It is the character chosen by 
JTDX for the T10 mode and would explain an earlier message that 
indicated that a FT8 spot on HamSpots appeared as T10 (likely came from 
JTAlert which spots "~" decodes as T10).


Is anyone using "T10"? When I've checked recently, usage seemed to be 
close to zero.


In any eveny, we had no idea that "~" was being used to flag a T10 
decode.  (Or, for that metter, that you were using those flags in 
JTAlert.)


Maybe you can tell it's FT8 because I (mistakenly) left two spaces 
between "~" and the start of message, rather than one.  :-)


-- Joe, K1JT

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Re: [wsjt-devel] FT8: Potential new mode for fast QSOs

[Laurie, VK3AMA]

On 30/06/2017 7:41 AM, Dan Malcolm wrote:

I also notice that there is a
tilde between "Freq" and "Message" in the "Band Activity" window.  Is that
an FT8 encoding indicator or a place holder?


The "~" mode character will be a problem. It is the character chosen by 
JTDX for the T10 mode and would explain an earlier message that 
indicated that a FT8 spot on HamSpots appeared as T10 (likely came from 
JTAlert which spots "~" decodes as T10).


de Laurie VK3AMA


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Re: [wsjt-devel] FT8: Potential new mode for fast QSOs

[Dan Malcolm]

Thanks Bill. I had forgotten you could do that with the frequency list.  I
generally don't keep anything but defaults.  I also notice that there is a
tilde between "Freq" and "Message" in the "Band Activity" window.  Is that
an FT8 encoding indicator or a place holder?

-Original Message-
From: Bill Somerville [mailto:g4...@classdesign.com] 
Sent: Thursday, June 29, 2017 4:27 PM
To: wsjt-devel@lists.sourceforge.net
Subject: Re: [wsjt-devel] FT8: Potential new mode for fast QSOs

On 29/06/2017 22:19, Dan Malcolm wrote:
> I also noticed that the
> dropdown band list did not have an entry for 20m FT8.  I was a simple 
> matter to add it.  I assume some of this is because FT8 is new and 
> just in the experimental stage.  Presumably these things will be taken 
> care of in due course and I understand you developers have more 
> important matters to attend to.

HI Dan,

the suggested frequencies listed by Joe are in the defaults but you will
have to reset the frequency list to see them. Resetting the frequency list
will remove any you have added manually so you may wish to just add them
yourself for now.

When we do the next official release we will probably force a reset. 
More refined tools for frequency list management will probably be available
from the next release.

73
Bill
G4WJS.



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Re: [wsjt-devel] FT8: Potential new mode for fast QSOs

[Bill Somerville]

On 29/06/2017 22:19, Dan Malcolm wrote:

I also noticed that the
dropdown band list did not have an entry for 20m FT8.  I was a simple matter
to add it.  I assume some of this is because FT8 is new and just in the
experimental stage.  Presumably these things will be taken care of in due
course and I understand you developers have more important matters to attend
to.


HI Dan,

the suggested frequencies listed by Joe are in the defaults but you will 
have to reset the frequency list to see them. Resetting the frequency 
list will remove any you have added manually so you may wish to just add 
them yourself for now.


When we do the next official release we will probably force a reset. 
More refined tools for frequency list management will probably be 
available from the next release.


73
Bill
G4WJS.


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Re: [wsjt-devel] FT8: Potential new mode for fast QSOs

[Dan Malcolm]

I was able to compile v1.7.1-devel with the new mode.  Once up and running I
did spot FA1ABL calling CQ @ 14.079+1300.  I wanted to just lurk awhile
first so I didn't answer him but hoped he would find someone to QSO with.
He didn't.  A while later he spotted me and reported it through HamSpots.
I wasn't sure if it would be reported or not but I was glad to see it was.
The odd thing was that it was reported as Mode T10.  I also noticed that the
dropdown band list did not have an entry for 20m FT8.  I was a simple matter
to add it.  I assume some of this is because FT8 is new and just in the
experimental stage.  Presumably these things will be taken care of in due
course and I understand you developers have more important matters to attend
to.  Thanks for your efforts. 

-73
Dan - K4SHQ

-Original Message-
From: Joe Taylor [mailto:j...@princeton.edu] 
Sent: Thursday, June 29, 2017 10:33 AM
To: WSJT software development <wsjt-devel@lists.sourceforge.net>
Subject: [wsjt-devel] FT8: Potential new mode for fast QSOs

Dear Development Colleagues,

Steve (K9AN) and I have developed a potential new mode for WSJT-X. 
We're calling the mode "FT8" (Franke-Taylor design, 8-FSK modulation).

FT8 is designed for situations like multi-hop Es where signals may be weak
and fading, openings may be short, and you want fast completion of reliable,
confirmable QSOs.

Important characteristics of FT8:

   - T/R sequence length: 15 s
   - Message length: 75 bits + 12-bit CRC
   - FEC code: LDPC(174,87)
   - Modulation: 8-FSK, keying rate = tone spacing = 5.86 Hz
   - Waveform: Continuous phase, constant envelope
   - Occupied bandwidth: 47 Hz
   - Synchronization: three 7x7 Costas arrays (start, middle, end of Tx)
   - Transmission duration: 79*2048/12000 = 13.48 s
   - Decoding threshold: -20 dB (perhaps -24 dB with AP decoding, TBD)
   - Operational behavior: similar to HF usage of JT9, JT65
   - Multi-decoder: finds and decodes all FT8 signals in passband
   - Auto-sequencing after manual start of QSO

*Comparison with slow modes JT9, JT65, QRA64:*  FT8 is a few dB less
sensitive but allows completion of QSOs four times faster.  Bandwidth is
greater than JT9, but about 1/4 of JT65A and less than 1/2 QRA64.

*Comparison with fast modes JT9E-H:*  FT8 is significantly more sensitive,
has much smaller bandwidth, uses the vertical waterfall, and offers
multi-decoding over the full displayed passband.

*Still to come, not yet implemented:*  We plan to implement signal
subtraction, two-pass decoding, and use of "a priori" (already known)
information as it accumulates during a QSO.

Three extra bits are available in the message payload, with uses yet to be
defined.  We have in mind special message formats that might be used in
contests, and the like.  Your considered suggestions for use of these bits
are very welcome!

K1JT, K9AN, and G4WJS have conducted on-the-air tests of FT8 with excellent
results.  We're now at a stage where tests under a wider range of conditions
are desirable.  If you can build WSJT-X from source code revision r7750 or
later, and would like to help, please do so and report your results to us!
Pre-built installation packages will be made available after further testing
is completed.

Suggestions for FT8 setup and examples of use can be found in a screen shot
posted here: http://physics.princeton.edu/pulsar/k1jt/ft8.png

We look forward to receiving your feedback.

-- 73, Joe, K1JT


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Re: [wsjt-devel] FT8: Potential new mode for fast QSOs

[Joe Taylor]

Hi Wolfgang,

Was your QSO on 50.313?  Will this be a good operating frequency for FT8 
in IARU Region 1 ?


-- Joe, K1JT

On 6/29/2017 3:10 PM, Wolfgang wrote:

Hello all,

had my first QSO with CT1FBK a few minutes ago.

Thanks Miguel, CT1FBK, for the reply to my very first CQ

Next QSO was with F1ABL


Smooth, fast and fine :-)

73 de Wolfgang
OE1MWW

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Re: [wsjt-devel] FT8: Potential new mode for fast QSOs

[Wolfgang]

Title: Re: [wsjt-devel] FT8: Potential new mode for fast QSOs


Hello all,

had my first QSO with CT1FBK a few minutes ago. 

Thanks Miguel, CT1FBK, for the reply to my very first CQ

Next QSO was with F1ABL


Smooth, fast and fine :-)

73 de Wolfgang
OE1MWW

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Re: [wsjt-devel] FT8: Potential new mode for fast QSOs

[Tamás Fábián]

I'm going to try and compile it on Ubuntu 17.04 "zesty" (Linux
4.10.0-26-generic x86-64) at next weekend.

If someone happens to be faster, and can send me a binary, I'll surely be
on the air ;)

Cheers,

Tamas HA5FTL

2017-06-29 20:32 GMT+02:00 George J Molnar :

> Compiled and run without incident on Mac OS 10.12.6 (beta). Monitored
> signal quality seems good.
>
> No contacts… yet!
>
>
> *George J Molnar*
> Nevada, USA
> KF2T  @GJMolnar
>
>
>
>
>
> 
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Re: [wsjt-devel] FT8: Potential new mode for fast QSOs

[James Shaver (N2ADV)]

Also compiled and running without issues. Decoded NV0O on 17 meters (I was 
working on the honeydo list around the house so wasn't able to respond) but am 
back on 17 now and calling CQ. 

73,

Jim S. 
N2ADV

> On Jun 29, 2017, at 2:32 PM, George J Molnar  wrote:
> 
> Compiled and run without incident on Mac OS 10.12.6 (beta). Monitored signal 
> quality seems good. 
> 
> No contacts… yet!
> 
> 
> George J Molnar
> Nevada, USA
> KF2T  @GJMolnar
> 
> 
> 
> 
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Re: [wsjt-devel] FT8: Potential new mode for fast QSOs

[George J Molnar]

Compiled and run without incident on Mac OS 10.12.6 (beta). Monitored signal 
quality seems good. 

No contacts… yet!


George J Molnar
Nevada, USA
KF2T  @GJMolnar




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Re: [wsjt-devel] FT8: Potential new mode for fast QSOs

[Jay Hainline]

Joe, I tried again and it seemed to work ok. I had my cursor on 1000 hz and 
N8JX called at 2000 hz and I decoded ok. False alarm I think. There might have 
been some meteor doppler or multipath playing when I tried the first time.

73 Jay

-Original Message-
From: Joe Taylor [mailto:j...@princeton.edu] 
Sent: June 29, 2017 18:15
To: WSJT software development <wsjt-devel@lists.sourceforge.net>
Subject: Re: [wsjt-devel] FT8: Potential new mode for fast QSOs

Hi Jay,

On 6/29/2017 2:02 PM, Jay Hainline wrote:
> I made my first QSO with the new mode with N8JX. It seems to work smoothly.
> One thing noticed it does not seem that bandpass decoding is available yet?
> I could not decode until I placed the marker on top of his signal.
> 
> 73 Jay KA9CFD

That should not be true.  It's *definitely* not true for me.

Did you save some *.wav files to experiment with?  If not, try the one attached 
to this email.  See the attached screen shot for decoding results.
-- Joe, K1JT



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Re: [wsjt-devel] FT8: Potential new mode for fast QSOs

[Jay Hainline]

I made my first QSO with the new mode with N8JX. It seems to work smoothly.
One thing noticed it does not seem that bandpass decoding is available yet?
I could not decode until I placed the marker on top of his signal.

73 Jay KA9CFD

-Original Message-
From: Joe Taylor [mailto:j...@princeton.edu] 
Sent: June 29, 2017 15:33
To: WSJT software development <wsjt-devel@lists.sourceforge.net>
Subject: [wsjt-devel] FT8: Potential new mode for fast QSOs

Dear Development Colleagues,

Steve (K9AN) and I have developed a potential new mode for WSJT-X. 
We're calling the mode "FT8" (Franke-Taylor design, 8-FSK modulation).

FT8 is designed for situations like multi-hop Es where signals may be weak
and fading, openings may be short, and you want fast completion of reliable,
confirmable QSOs.

Important characteristics of FT8:

   - T/R sequence length: 15 s
   - Message length: 75 bits + 12-bit CRC
   - FEC code: LDPC(174,87)
   - Modulation: 8-FSK, keying rate = tone spacing = 5.86 Hz
   - Waveform: Continuous phase, constant envelope
   - Occupied bandwidth: 47 Hz
   - Synchronization: three 7x7 Costas arrays (start, middle, end of Tx)
   - Transmission duration: 79*2048/12000 = 13.48 s
   - Decoding threshold: -20 dB (perhaps -24 dB with AP decoding, TBD)
   - Operational behavior: similar to HF usage of JT9, JT65
   - Multi-decoder: finds and decodes all FT8 signals in passband
   - Auto-sequencing after manual start of QSO

*Comparison with slow modes JT9, JT65, QRA64:*  FT8 is a few dB less
sensitive but allows completion of QSOs four times faster.  Bandwidth is
greater than JT9, but about 1/4 of JT65A and less than 1/2 QRA64.

*Comparison with fast modes JT9E-H:*  FT8 is significantly more sensitive,
has much smaller bandwidth, uses the vertical waterfall, and offers
multi-decoding over the full displayed passband.

*Still to come, not yet implemented:*  We plan to implement signal
subtraction, two-pass decoding, and use of "a priori" (already known)
information as it accumulates during a QSO.

Three extra bits are available in the message payload, with uses yet to be
defined.  We have in mind special message formats that might be used in
contests, and the like.  Your considered suggestions for use of these bits
are very welcome!

K1JT, K9AN, and G4WJS have conducted on-the-air tests of FT8 with excellent
results.  We're now at a stage where tests under a wider range of conditions
are desirable.  If you can build WSJT-X from source code revision r7750 or
later, and would like to help, please do so and report your results to us!
Pre-built installation packages will be made available after further testing
is completed.

Suggestions for FT8 setup and examples of use can be found in a screen shot
posted here: http://physics.princeton.edu/pulsar/k1jt/ft8.png

We look forward to receiving your feedback.

-- 73, Joe, K1JT


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Re: [wsjt-devel] FT8: Potential new mode for fast QSOs

[James Shaver (N2ADV)]

I'm compiling now - count me in!

73,

Jim S. 
N2ADV

> On Jun 29, 2017, at 1:43 PM, Bill Somerville  wrote:
> 
>> On 29/06/2017 18:37, char...@sucklingfamily.free-online.co.uk wrote:
>> Built and running - no on-air tests yet.
> 
> Hi Charlie,
> 
> if you want a test QSO I'm sure we can find a band we can work on.
> 
> 73
> Bill
> G4WJS.
> 
> 
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Re: [wsjt-devel] FT8: Potential new mode for fast QSOs

[Bill Somerville]

On 29/06/2017 18:37, char...@sucklingfamily.free-online.co.uk wrote:

Built and running - no on-air tests yet.


Hi Charlie,

if you want a test QSO I'm sure we can find a band we can work on.

73
Bill
G4WJS.


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Re: [wsjt-devel] FT8: Potential new mode for fast QSOs

[Joe Taylor]

Hi Charlie,

On 6/29/2017 1:37 PM, G3WDG wrote:

Built and running - no on-air tests yet.

Noticed that the 15s period is insufficient to get the cw id in.


RR, we're aware of this.  Will probably need to devote a full Tx period 
to CW ID, for those who need it.


-- Joe, K1JT

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Re: [wsjt-devel] FT8: Potential new mode for fast QSOs

[charlie]

Hi Joe

Built and running - no on-air tests yet.

Noticed that the 15s period is insufficient to get the cw id in.

Charlie

> Dear Development Colleagues,
>
> Steve (K9AN) and I have developed a potential new mode for WSJT-X.
> We're calling the mode "FT8" (Franke-Taylor design, 8-FSK modulation).
>
> FT8 is designed for situations like multi-hop Es where signals may be
> weak and fading, openings may be short, and you want fast completion of
> reliable, confirmable QSOs.
>
> Important characteristics of FT8:
>
>- T/R sequence length: 15 s
>- Message length: 75 bits + 12-bit CRC
>- FEC code: LDPC(174,87)
>- Modulation: 8-FSK, keying rate = tone spacing = 5.86 Hz
>- Waveform: Continuous phase, constant envelope
>- Occupied bandwidth: 47 Hz
>- Synchronization: three 7x7 Costas arrays (start, middle, end of Tx)
>- Transmission duration: 79*2048/12000 = 13.48 s
>- Decoding threshold: -20 dB (perhaps -24 dB with AP decoding, TBD)
>- Operational behavior: similar to HF usage of JT9, JT65
>- Multi-decoder: finds and decodes all FT8 signals in passband
>- Auto-sequencing after manual start of QSO
>
> *Comparison with slow modes JT9, JT65, QRA64:*  FT8 is a few dB less
> sensitive but allows completion of QSOs four times faster.  Bandwidth is
> greater than JT9, but about 1/4 of JT65A and less than 1/2 QRA64.
>
> *Comparison with fast modes JT9E-H:*  FT8 is significantly more
> sensitive, has much smaller bandwidth, uses the vertical waterfall, and
> offers multi-decoding over the full displayed passband.
>
> *Still to come, not yet implemented:*  We plan to implement signal
> subtraction, two-pass decoding, and use of "a priori" (already known)
> information as it accumulates during a QSO.
>
> Three extra bits are available in the message payload, with uses yet to
> be defined.  We have in mind special message formats that might be used
> in contests, and the like.  Your considered suggestions for use of these
> bits are very welcome!
>
> K1JT, K9AN, and G4WJS have conducted on-the-air tests of FT8 with
> excellent results.  We're now at a stage where tests under a wider range
> of conditions are desirable.  If you can build WSJT-X from source code
> revision r7750 or later, and would like to help, please do so and report
> your results to us!  Pre-built installation packages will be made
> available after further testing is completed.
>
> Suggestions for FT8 setup and examples of use can be found in a screen
> shot posted here: http://physics.princeton.edu/pulsar/k1jt/ft8.png
>
> We look forward to receiving your feedback.
>
>   -- 73, Joe, K1JT
>
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