Hi Tony, I have often switched from FH to FSK-Hell when working the
States from
VK via the Long-Path on 20M when conditions are poor.
Often switching to FSK was the only way to complete (or even initiate)
the QSO and the improvement in copy was often quite dramatic, from very
difficult/impossible copy to "arm-chair" copy. de Laurie, VK3AMA
It does seem to make a a substantial difference on long-haul propagation
Laurie. Please feel free to send me any screen shots you might have -
it's always interesting to see how the different modes print under tough
conditions.
Thanks,
Tony -K2MO
On 3/08/2010 10:32 AM, Tony wrote:
> All,
>
> I spent a little time this weekend comparing FSK-Hell to the standard
> Feld Hell mode. FSK-Hell is a modified version of PSK-Hell which was
> developed to improve readability over HF. The difference tends to show
> up more on long-haul paths where signals are more likely to encounter
> ionospheric distortion.
>
> Unfortunately, I didn't find any DX, but I did manage to work a few west
> coast stations from here in W2. I didn't expect to see much of an
> improvement since conditions on 20 meters were relatively quite
> (moderate multi-path fading), but in practice, there was a noticeable
> difference.
>
> Contrast was noticeably improved and the text did stand out more with
> FSK-Hell than it did with Feld Hel. This is especially true with weak
> signals. The 105 baud mode allows even more contrast which shows up both
> on-air and with the path simulator.
>
> All in all, FSK-Hell does offer better readability over Feld Hell. Click
> on the link below to see an on-air and example of how the modes
> compared. FSK-Hell is available in IZ8BLY's Hellschreiber (FM-Hell),
> DM780, MixW and Multipsk.
>
> http://www37.zippyshare.com/v/71092013/file.html
>
> Tony -K2MO
>
>
>
>
> ------------------------------------
>
> http://www.obriensweb.com/digispotter.html
> Chat, Skeds, and "Spots" all in one (resize to suit)
>
> Facebook= http://www.facebook.com/pages/digitalradio/123270301037522
>
> Yahoo! Groups Links
>
>
>
>
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