[RTTY] Mark & Space - High Tones

[Joe Subich, W4TV]

 > The mark is anyway the nearest tone to the suppressed carrier zero
 > beat frequency.

That is *incorrect* ... if one connects a frequency counter to the
output of the transmitter, MARK is always the *higher* of the two
measured frequencies - regardless of whether the suppressed carrier
frequency is above or below the two tones (e.g., USB or LSB).

73,

    ... Joe, W4TV


On 6/8/2011 6:36 PM, iw1ayd wrote:
> Phil, may I say: yes.
>
>                                               !
> space   mark               zero beat               mark  space
>                                               !
>
> The mark is anyway the nearest tone to the suppressed carrier zero beat
> frequency. The readout on radio may change but this is the picture.
>
>
>              73 de iw1ayd Salvo
>> Message: 4
>> Date: Wed, 08 Jun 2011 12:58:00 -0400
>> From: Phil Sussman<psussman at pactor.com>
>> Subject: [RTTY] Mark&   Space - High Tones
>> To: rtty at contesting.com
>> Message-ID:<20110608125800.11931rgjimcb8v14 at pactor.com>
>> Content-Type: text/plain; charset=ISO-8859-1; DelSp="Yes";
>> 	format="flowed"
>>
>> 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
>>
>
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