ai6kj
New Member
Posts: 4
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Post by ai6kj on Oct 12, 2015 14:43:48 GMT -7
Does anyone know the minimum internet speed for using a hotspot? Can ADSL be used with an upload speed of .40 Mbps?
Thanks,
Barbara AI6KJ
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Post by W6KD on Oct 12, 2015 16:32:07 GMT -7
The D*Star data stream is only 4.8Kbps, so a 400 Kbps link is almost two orders of magnitude more than needed--assuming that there isn't a lot of latency or jitter due to the reliability of the connection or possibly what else it might be shared with.
I've used a portable hotspot on 3G cellular data connections to good effect...3G's min speed is 400 kbps (though it can be quite a bit higher in places)
Regards
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ai6kj
New Member
Posts: 4
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Post by ai6kj on Oct 12, 2015 17:18:53 GMT -7
Thank you Bob. Just the information that I needed. I was afraid that I would have to switch from DSL to cable for my internet.
73s Barbara
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k7rex
New Member
Posts: 10
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Post by k7rex on Jul 26, 2016 10:59:55 GMT -7
I have ran into bandwidth issues using a satellite Internet connection... More often than not D-STAR won't work and when it does it doesn't work smoothly.
Dan / K7REX
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Post by W6KD on Jul 26, 2016 15:57:42 GMT -7
I doubt it's a bandwidth issue...DStar is only a 4.8Kb stream. With satellite, your problem is more likely to be jitter--the variability in transmission time--that causes a problem.
The consumer satellite internet services typically use something like the Nagle algorithm to store outbound data at the uplink node until a much larger frame can be formed and sent. This results in the data being bunched up instead of a fairly smooth and regular stream of packets. It's possible this could be addressed in a future protocol design, but right now, significant jitter will degrade the DStar signal you send and receive.
Might be worth checking with Hughes or whoever your service provider is to see if there's a way of reducing or even turning off the Nagle algorithm effects.
Regards
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