[Elecraft] K3 DATA A vs AFSK A

[Charlie T, K3ICH]

So does "shift, plus, question mark"  as in  "^+?"

Anybody wanna take a shot at what THAT means ?

Charlie k3ICH


----- Original Message ----- 
From: "David Cole" <dave at nk7z.net>
To: <elecraft at mailman.qth.net>
Sent: Wednesday, March 18, 2015 12:17 AM
Subject: Re: [Elecraft] K3 DATA A vs AFSK A


> LSMFT had several other meanings...  :)
> -- 
> Thanks and 73's,
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> On Tue, 2015-03-17 at 17:47 -0700, Lynn W. Taylor, WB6UUT wrote:
>> ... and it should be LSB because everyone knows: Low Space Means Fine
>> Teletype.
>>
>> On 3/17/2015 4:00 PM, Joe Subich, W4TV wrote:
>> >
>> > Note: in my comment below Mark-85 Hz should be MARK+85 Hz as AFSK A
>> > (LSB) reverses the sense of the tones - Mark is the lower of the two
>> > audio tones but the higher of the RF frequencies.
>> >
>> > 73,
>> >
>> >    ... Joe, W4TV
>> >
>> >
>> > On 2015-03-17 6:48 PM, Fred Jensen wrote:
>> >> Hmmm ... this may be the first time Fred Cady's book has failed me.  I
>> >> understand now "what" each mode does.  What's still not clear is "why
>> >> would I choose one over the other?"  Operator/User manuals tend not to
>> >> answer that question, they are understandably focused on exactly how 
>> >> to
>> >> operate the equipment.
>> >>
>> >> I'm very sure that, when I first set up RTTY, I went to AFSK A because 
>> >> I
>> >> knew what audio frequency shift keying was and I didn't know what DATA 
>> >> A
>> >> was.  It all worked, so I never changed it or tried out the other
>> >> choice.  I guess if AFSK A is LSB and works with MMTTY in its default
>> >> configuration, then DATA A is USB and I'd have to reverse the tones in
>> >> MMTTY.
>> >>
>> >> I'll leave it as I've been using it, it works so it obviously doesn't
>> >> need fixing.  I was just curious.  I have my "pitch" set at 915 Hz, I
>> >> can't hear 2,125 Hz.  Thanks Joe and Mike.
>> >>
>> >> 73,
>> >>
>> >> Fred K6DGW
>> >> - Northern California Contest Club
>> >> - CU in the 50th Running of the Cal QSO Party 3-4 Oct 2015
>> >> - www.cqp.org
>> >>
>> >> On 3/17/2015 10:07 AM, Joe Subich, W4TV wrote:
>> >>>
>> >>> On 2015-03-17 12:41 PM, Fred Jensen wrote:
>> >>>  > Can you 'splain the difference between AFSK and DATA A?
>> >>>
>> >>> AFSK A and DATA A are both audio modes.  AFSK A uses LSB
>> >>> and FC is set to MARK - 85 Hz (the center of the two RTTY
>> >>> Tones).  DATA A is USB and FC is set to 1500 Hz (the center
>> >>> of the transmit audio passband [200 - 2800 Hz]).
>> >>>
>> >>> AFSK A also allows use of the AFSK transmit filter (a tight
>> >>> filter around the Mark/Space tones to eliminate hum/pops/etc.)
>> >>> and the use of the Dual Tone filter on receive.
>> >>
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