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[hfsig] Re: [Flexradio] The final nail in the coffin of Morse ?

Trevor AKA m5aka at yahoo.co.uk
Wed Jul 27 19:39:09 UTC 2005


Regarding new data modes I am not clear what relevance the geographic area that
the originator of a mode happened to live in has got to do with anything.

The key thing is that the Amateurs in each country seek to get the most
flexiable terms possible from their local regulator. 

The UK is fortunate in having no bandwidth restrictions on HF, we could in
theory run 100 kHz B/W if we wanted to. In reality practical bandwidths on HF
are governed by the bandwidth of the SSB filters provided in transceivers.
Currently raw data rates as high as 25 kbps can be squeezed into an SSB
channel; although it gets ripped to shreds by skywave reflections and a raw
rate of 12 kbps is more realistic.

It seems to me that a prime use for high data rates would be video
transmission. Full Motion Video with sound can done in a data rate of around 33
kbps (very small picture slow frame rate but usable). This should be achievable
in a 7.5 kHz B/W and something as exciting as Video transmission probably would
encourage Amateurs to have a wide band filter fitted in their rigs. Signals
this wide would be feasable on the 75 metre and 10 metre bands.

73 Trevor M5AKA

--- jeff at aerodata.net wrote:

> >> Considering a large majority (all?) of the new innovative sound card
> >> modulations have come out of Europe over the last 10 years, I suspect
> >> what
> >> you are fore-telling has already come to pass.
> >
> > Hmmm, Joe Taylor still lives in Princeton, NJ, USA and has developed more
> > sound card modes than are used on HF.  FSK441 for meterior scatter, JT6M
> > for 6m EME, JT65 for weak signal EME, JT44 and older EME mode.  He's also
> > working on a new EME mode.
> 
> Yeap, I was talking about HF. AFAIK, Joe's software is just for VHF/UHF
> (meteor scatter and EME) although I imagine it could be used on HF.
> 
> > Wasn't MFSK16 done by ZL1BPU?  Isn't ZL1 New Zealand? :)
> 
> 
> Yes, that is New Zealand. However, MFSK's roots are with Picolo, which was
> developed in Great Britian during WW2. MFSK16 was first coded into
> software by IZ8BLY (an italian) although I believe Murry certainly
> contributed to the design.
> 
> But neither of them are U.S. hams.
> 
> 
> 
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