Chen,
That's all true ... but the new software authors do not make
that clear in their documentation. Some authors stick with
2125/2295 and fail to include a "reverse" or "invert" function
to put Mark above Space for USB operation.
73,
... Joe, W4TV
> -----Original Message-----
> From: rtty-bounces@contesting.com
> [mailto:rtty-bounces@contesting.com] On Behalf Of Kok Chen
> Sent: Tuesday, January 10, 2006 7:35 PM
> To: RTTY Reflector
> Subject: Re: [RTTY] NAQP RTTY on NCDXF Beacon]
>
>
>
> On Jan 10, 2006, at 4:08 PM, John Becker wrote:
>
> > Now Joe, RTTY has *always* been lower sideband.
> > At least the 35 years I have been running it.
>
> You can generate a compatible RTTY signal using either USB or LSB (I
> switch between them all the time).
>
> All that is required to be compatible with other folks is that the
> Mark is the higher of the two FSK "carriers" on the RF spectrum.
>
> If you are using LSB, Mark is the lower AFSK tone (for example, mark
> at 2125 Hz, space at 2295 Hz). I.e., mark is closer to the
> suppressed carrier than space on the RF spectrum if you use LSB.
>
> If you are using USB, Mark is the higher AFSK tone (e.g., mark at
> 2295 Hz and space at 2125 Hz).
>
> As long as you maintain that, with a separation between the two
> carriers of 170 Hz, and a 22ms bit period, you can communicate with
> other Amateurs.
>
> 73
> Chen, W7AY
>
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