[Lowfer] TAG on 185.302 in NEW Mode!

[John Andrews]

Ken,

> If the signal is fading, the slower speeds like QRSS3 have
> an advantage because of more repeats of the letters.

It also depends whether you are trying to work in real time or not. A lot of
the Lowfer work is done with unattended screen captures, and it's easy to
set the timer so that they overlap.

> Also in selection of a transmit speed,  recommendations are for
> QRSS3 or QRSS10.  QRSS10 was used successfully this past week
> at power levels of 1600, 800, 400 and 200 Micro Watts from two different
> stations on 10140.130 khz.  Codewords were copied on all four Micro Watt
> levels here and at other receive stations.

That's very appropriate for the frequency involved, where frequency
stability is shaky because of propagation. Assuming the more stable
conditions at LF, though, you theoretically pick up another 3 dB of signal
to noise ratio every time you halve the data rate. Having worked with really
painful stuff like QRSS120, I can testify that it does make a difference,
assuming that a path exists for the duration of the message!

John Andrews, W1TAG