On Wed, 13 May 2009 17:19:15 -0700, "Dan Smith"
said:
> > Probably not the IC-V82 + UT-118. That rig has no serial port,
> > AFAIK. It's just a commercial HT with an add-on board. To do the
> > low-speed data you need one of the later rigs with a serial port on
> > it.
>
> The V/U82s do have
> Just to clarify (and be a pedantic little sod ;-) you can encode binary data
> into 2D barcodes with this scheme using "Base 256" mode.
The 2D barcodes that I've used also include some form of FEC too!
> Simon
Jonathan G4KLX
> > YAES. :-) (Yet another encoding scheme.) Yawn. :-)
>
> YAESTDSBT - Yet another encoding scheme that doesn't support binary
> transfers. Double Yawn :)
>
Just to clarify (and be a pedantic little sod ;-) you can encode binary data
into 2D barcodes with this scheme using "Base 256" mode.
Would POCSAG be useful in place of FEC for short data exchanges ? de nu5d
Dan Smith wrote:
>> So am I right in my understanding that a DStar 2m radio (such as
>> IC-V82 + UT-118) will send (or can be made to send) unadulterated
>> data over the voice+data channel?
>>
>
> Yes*.
>
> The footno
With a tip of the hat to Dan (KK7DS) and Pete's (AE5PL) applications
that use the extra data space in the D-STAR DV signal, I don't believe
it was ever intended to be a reliable and transparent data service.
It's great to have a place to send some data along with voice data (and
its FEC), but
> D-STAR Low Speed Data has so much promise, but Icom's serial port
> implementation severely handicaps implementation.
>From my limited (theoretical) experience I would have to agree. It looks like
>the D-Star serial implementation is a complete mess with data intermixed with
>control frames
.
Ed WA4YIH
From: dstar_digital@yahoogroups.com [mailto:dstar_digi...@yahoogroups.com] On
Behalf Of mungewell
Sent: Wednesday, May 13, 2009 5:06 PM
To: dstar_digital@yahoogroups.com
Subject: [DSTAR_DIGITAL] Re: Compression/encoding on data-only transmissions
Yes, in relation to the size of the
> Probably not the IC-V82 + UT-118. That rig has no serial port,
> AFAIK. It's just a commercial HT with an add-on board. To do the
> low-speed data you need one of the later rigs with a serial port on
> it.
The V/U82s do have a serial port on them. It's down at the bottom of
the rig in the mo
On Wed, 13 May 2009 18:37:18 -, "mungewell"
said:
> So am I right in my understanding that a DStar 2m radio (such as IC-V82 +
> UT-118) will send (or can be made to send) unadulterated data over the
> voice+data channel?
Probably not the IC-V82 + UT-118. That rig has no serial port, AFAIK.
> Sure, but don't forget that at ~900 bps throughput, 3116 numbers take a
> REALLY long time to transmit. (30s)
With compression this would be 1588 codewords + 620 bytes of FEC, so really
only 20s ;-)
> I'd definitely recommend trying to keep the packet sizes less than a few
> D-STAR frames,
> Since the
> radios use XON/XOFF flow control, those values are obviously out.
ekk! You'd have thought that they would have worked around that.
> D-RATS does compression and error detection. At 900 baud, FEC starts
> to eat up your channel pretty quick. For most connections, framing
> and che
> So am I right in my understanding that a DStar 2m radio (such as
> IC-V82 + UT-118) will send (or can be made to send) unadulterated
> data over the voice+data channel?
Yes*.
The footnote being that you can't send any byte sequence. Since the
radios use XON/XOFF flow control, those values are
Embedded
From: dstar_digital@yahoogroups.com [mailto:dstar_digi...@yahoogroups.com] On
Behalf Of mungewell
Sent: Wednesday, May 13, 2009 2:37 PM
To: dstar_digital@yahoogroups.com
Subject: [DSTAR_DIGITAL] Re: Compression/encoding on data-only transmissions
I'll have a look as D-RATS.
So
--- In dstar_digital@yahoogroups.com, John Hays wrote:
>
> Hi Simon,
>
> Good questions. It's nice to see someone actually looking at the spec :)
Yes, but I wish the spec was a little clearer. They also appear to muddle bits
and bytes.
>
> Q1: The DD (Digital Data or Data-Only) mode, is spec
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