[Lowfer] WM

[N8OOU]

Hi Andy,

Thanks for the report on WM. I appreciate your feedback  My goal was to 
try to duplicate the analog WM look, and also experiment with improving 
it with the digital hardware. I can quickly turn either the WM graphic, 
or FSK segment off/on, and run with just the other.

The "WM" is created using the U3S custom graphic feature. The 
hellschrieber font built in the U3S doesn't have the Ashlock look. Altho 
it would likely come through better on the receiving end. I'll have to 
set that up for a try.

The U3S currently restricts the output frequency to 1 Hz steps. To shift 
the FSK portion up by .5 Hz, I had to make the complete FSK transmission 
a graphic also. The output frequency is set to 185,300 in the U3S, the 
bottom .5Hz in the graphic is not used.

I have been in contact with Hans, the U3S developer, to put some 
enhancements in the U3S firmware which would give more capability to 
LF/QRSS transmissions. That is of course, sometime down the road.
In the mean time we can continue to explore the capability the machine 
has currently.

Thanks for listening.


73   de   N8OOU - Mike Meek

On 02/07/2016 10:15 AM, Andy - KU4XR via Lowfer wrote:
> On Sun, 2/7/16, Garry <k3siw at sbcglobal.net> wrote:
>
>   Mike,.......
>   I think the FSK "WM" adds unnecessary clutter and simple
>   QRSS30 would be  better. Despite a rather strong signal this morning (visible
>   at rate  QRSS3), the visual "WM" does not stand out well on my
>   captures. It seems  to be composed of frequency steps that are too large and infrequent.
>   73, Garry, K3SIW, EN52ta, Elgin, IL
> __________________________________________________________________________
>
> Good day all: My observations and comments... My local noise level was low, and the
> usual powerline buzz was not a huge problem.. But, propagation seemed to be down
> overall thru the night, and the usual sunrise peak ... well, it didn't... " SJ " was in for
> the most of the night, and did get very strong near sunrise here... I only saw 2 verifiable
> " TAG " sequences.. one close to 11 pm EST, and one near 3 am EST.. the rest of the night
> just saw several intermittent traces...
> On " WM " .. copy was very light here, and as Garry mentioned; The QRSS was readable,
> but the Graphical Font is not optimum for LF use...
> ** My personal preference here ** ... Consider dropping the QRSS, and " Go Back " to the
> Graphical only sequence.. and optimize the timing for a longer integration period...
> The original " WM " graphic was easily readable... I assume that the U3 is using a
> hellschrieber font... and most likely was not chosen with LF in mind..
> But, I echo Garry's comment again... It is transmitting, and making it to Friendsville, TN.
>
> 73 : Andy - XR
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