Actually "low tones" were 1275/1445 ... more common in Europe than
in the US. 915/1085 (centered on 1000 Hz) is another artifact of
modern programmers who did not understand RTTY and were used to
1 KHz as a "benchmark" in PSK31.
73,
... Joe, W4TV
On 6/8/2011 8:59 PM, Jim W7RY wrote:
> The use of the name "high tones" refered to 2125/2295. Low tones were
> around 900/1070 (give or take).
>
> Hal communications manufactured ST-6000s with either set of tones.
>
>
> Please don't confuse high/low tones with which one is mark or space. It's
> either mark or space. Not high or low tone.
>
> 73
> Jim W7RY
>
> --------------------------------------------------
> From: "Joe Subich, W4TV"<lists@subich.com>
> Sent: Wednesday, June 08, 2011 12:22 PM
> To: "Phil Sussman"<psussman@pactor.com>; "RTTY"<rtty@contesting.com>
> Subject: Re: [RTTY] Mark& Space - High Tones
>
>>
>>> On USB I believe the designations should be reversed, since 2125 Hz
>>> would be the LOWER RF frequency.
>>
>> You are correct. MARK is the tone that provides the *HIGHER* RF
>> frequency. Thus if you use USB AFSK the conventional "High tones"
>> would be 2295 Hz = Mark and 2125 = Space.
>>
>> Nearly all material on RTTY (and most Yaesu transceivers designed prior
>> to the FT-9000/FT-2000/FT-950) assumes operation in LSB as that was the
>> "standard" for nearly 30 years until the "lazy programmers" showed up
>> with multi-mode software like HRD, fldigi, MixW, etc. that only worked
>> in USB.
>>
>> Unlike software from the "lazy programmers," MMVARI allows selecting
>> *either* USB or LSB for sideband sensitive modes like RTTY, MFSK, and
>> QPSK.
>>
>> 73,
>>
>> ... Joe, W4TV
>>
>>
>> On 6/8/2011 12:58 PM, Phil Sussman wrote:
>>> I've been wandering on the AA5AU RTTY pages in search of
>>> Don's email address.
>>>
>>> After my exchange with Chen, I had a question about the
>>> RTTY Intro page on Don's site. It is noted that high tones
>>> are 2125Hz and 2295Hz (170 Hz split), Mark and Space
>>> respectively. While nothing is specifically mentioned at
>>> that point, the Mark and Space designations given are only
>>> applicable for LSB. On USB I believe the designations should
>>> be reversed, since 2125 Hz would be the LOWER RF frequency.
>>>
>>> Am I right or merely confused?
>>>
>>> Thanks ES 73,
>>>
>>> de Phil - N8PS
>>>
>>>
>>>
>>>
>>> _______________________________________________
>>> RTTY mailing list
>>> RTTY@contesting.com
>>> http://lists.contesting.com/mailman/listinfo/rtty
>>>
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>>
>>
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