I think it is useful to think about WHY you would want to introduce "new
technology". It does make sense
to take advantage of current development concerning modulation and
bitrate, and in this area Ham Radio
is far behind. As for TDMA, why would we want that ? Well, I feel
separate channels is against the spirit of
ham radio, however as a vehicle for single frequency use it would be
nice. Also "subrepeating" a timeslot
could allow for "distributed" repeaters, covering large or rather
controlled areas such as a county,
and a means for a local group to JOIN a larger community.
We are seeing subtones creating "private" repeaters, various
incompatible digital modes effectively
fencing out traveling and occasional users, sometimes because you do not
know the access "code".
I would like to se Hams absorbing new technology, but rather expanding /
extending it and making new uses
of it, rather than just trying to mimic cellphone networks. More "we
have a need, what if...."
And of course, OPEN engineering for anyone to replicate.....
SM6FBD
On 2017-12-06 22:11, Adrian Musceac wrote:
Perhaps it is possible. However, we have repeaters around here with more than
200 km coverage radius, and I don't see TDMA solving both capacity and
coverage. Time will tell.
Glen, thanks for expanding on LTE. I am not deeply familiar with the LTE PHY
and I don't intend to copy it, just botrow some ideas.
best regards,
Wdrian
I think that's more a limitation of existing protocols. For example we
could design a TDMA protocol to handle longer distances, or use probe
packets to measure the propagation delay and compensate (e.g. send
schedule tx for a later timeslot).
OFDMA sounds interesting, I'll look into it some time.
I agree with Glen - mFSK is just a small change to 2FSK in terms on
implementation complexity.
Meanwhile people tend to disregard open
source projects as inferior, so getting traction won't happen soon.
Perhaps in today's Ham community, however in the wider fields of
engineering and IT open source is generally regarded as superior - for
good reason.
Cheers,
David
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