[CQ-Contest] Mode-X

[ktfrog007 at aol.com]

AB7E is proposing a new digital mode of more general utility than FTx but using similar error correcting techniques. That he's involving CW (International Morse Code sent by keying a continuous wave oscillator) in an artificial way clouds and confuses the issue. Exclude the artificial CW part and it is an interesting concept to consider. 

How would you design it? Why do we need it? What are its goals? What activities should it support? Let's do that and come up with some specifications. 

If someone wants to design a digital mode post-processor to generate Morse Code audio, that is a separate concept and it could be used with any digital mode: Mode-X, RTTY, PSK, FTx, Olivia, Feld Hell, whatever. I personally don't see a need for it and doubt it would be popular.


73,
Ken, AB1J

-----Original Message-----
From: David Gilbert <ab7echo at gmail.com>
To: Paul O'Kane <pokane at ei5di.com>; 'CQ-Contest at contesting. com' <cq-contest at contesting.com>
Sent: Sun, Feb 20, 2022 3:18 am
Subject: Re: [CQ-Contest] ARRL to allow self-spotting in contests


Unless you're using a rig made 30 years ago, any CW signal you receive 
has already been sliced, diced, unsliced and undiced a LOT more than you 
apparently realize.  Nobody, including you, "hears" RF ... it is all 
extensively converted and manipulated (RF filtering, digital mixing, 
audio filtering, etc) before it gets to your ears. It has even been 
quite heavily massaged on transmit ... filtering, compression, and wave 
shaping.

I'm simply suggesting the addition of some more effective signal 
processing using modern techniques ... techniques, by the way, that 
COULD be included in the firmware of any rig and you would never know 
the difference as long as you were talking to somebody that had a rig 
with similar features.  Except, of course, that you'd be able to 
communicate with better S/N performance than folks who didn't have that 
capability.

73,
Dave   AB7E


On 2/19/2022 3:04 PM, Paul O'Kane wrote:
>
> This argument is futile.  Regardless of how FT8 works, CW is an analog 
> mode along its entire RF signal path - a mode that can be decoded by 
> people.   If CW is sliced and diced to make it a digital RF mode that 
> has to be un-sliced and un-diced before being output in an audible 
> form, then it's no longer CW.
>
> AB7E is welcome to his "enhanced CW", but count me out - it's time to 
> get real.
>
> 73,
> Paul EI5DI
>
>
> On 19/02/2022 20:55, David Gilbert wrote:
>>
>> I know how FT8 works (I've studied Joe's papers and researched the 
>> principles) and I would have no intention of making anything else 
>> work like FT8 does.  It's simply too restrictive, particularly for 
>> contesting.  But the signal processing behind FT8 is applicable to 
>> several different communication formats. If you really knew how FT8 
>> works you'd understand that.
>>
>> Dave  AB7E
>>
>>
>> On 2/18/2022 2:30 PM, Peter Voelpel wrote:
>>> You better read how FT-8 works and compare
>>>
>>> -----Original Message-----
>>> From: David Gilbert [mailto:ab7echo at gmail.com]
>>> Sent: Freitag, 18. Februar 2022 22:13
>>> To: Peter Voelpel; cq-contest at contesting.com
>>> Subject: Re: [CQ-Contest] ARRL to allow self-spotting in contests
>>>
>>>
>>> Wrong.  FT8 has nothing to do with CW, but the signal processing behind
>>> it could be used to significantly enhance CW.  Think RTTY with MUCH
>>> better S/N and an audible output instead of text on the screen.
>>>
>>> 73,
>>> Dave   AB7E
>>>
>>>
>>> On 2/18/2022 12:03 PM, Peter Voelpel wrote:
>>>> That communication technique has nothing in common with CW at all!
>>>>
>>>> 73
>>>> Peter, DJ7WW
>>>>
>>>> -----Original Message-----
>>>> From: CQ-Contest
>>>> [mailto:cq-contest-bounces+dj7ww=t-online.de at contesting.com] On 
>>>> Behalf Of
>>>> David Gilbert
>>>>
>>>> The signal processing techniques utilized in FT8 could have been 
>>>> used to
>>>> enhance the signal-to-noise of normal CW in a way that would have been
>>>> virtually transparent to the operator
>>>>
>>>
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>>
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