[amsat-bb] A suggestion for Experimenter's Wednesdays on AO-91

Mac A. Cody maccody at att.net
Fri Dec 15 06:26:08 UTC 2017


I'm embarrassed to say that I've never done anything personally with 
NBEMS.  What I
knowabout it isfrom a presentation at my radio club.  We have had a 
group that was
experimenting with NBEMS on the club repeater.  Don't know whether they 
are still
doing it, though.  They weren't using any special interface between 
radios and
computers - speaker output to microphone input in both directions.  I'd 
like to try
NBEMS on the FM birds simply as a way of experimenting with using LEO 
birds for
emergency response.

As you mentioned, there is a lot of sites out there describing how to 
use NBEMS using
Fldigi/Flmsg.  I have not seen anything specific, yet, regarding to 
using NBEMS over
a satellite.  I'm sure that there are attendant challenges and 
opportunities doing so.
Doppler shift and signal quality will be the main challenges. MT65 
appears to be the
modulation scheme of choice.  Full duplex operation would be helpful, as 
you could
monitor your own signal to verify its quality and how well the message 
got through.

I'll have to investigate further.


Mac Cody - AE5PH

On 12/14/2017 11:38 PM, Scott wrote:
> I've always been curious about NBEMS as well, Mac.
> There is a fair amount of info on the subject online, but could you 
> point me to any particular orientation how-to that might be geared to 
> someone using it in a more informal setting such as how we might use 
> it via an FM satellite?
> -Scott,  K4KDR
> ========================
> -----Original Message----- From: Patrick STODDARD (WD9EWK/VA7EWK)
> Sent: Friday, December 15, 2017 12:29 AM
> To: Mac A. Cody
> Cc: amsat-bb at amsat.org
> Subject: Re: [amsat-bb] A suggestion for Experimenter's Wednesdays on 
> AO-91
> Mac,
> Now that's a good idea. Otherwise, Wednesdays on AO-85
> could be called SSTV Wednesdays, if that's the extent
> of "Experimenter's Wednesdays" for that satellite. I would
> be inclined to try NBEMS, something I've never used.
> 73!
> Patrick WD9EWK/VA7EWK
> http://www.wd9ewk.net/
> Twitter: @WD9EWK or http://twitter.com/WD9EWK
> On Thursday, December 14, 2017, Mac A. Cody <maccody at att.net> wrote:
>> Patrick,
>> If, as you stated, SSTV has run its course, maybe Experimenter's
>> Wednesdays on AO-85 could be changed to experiment with EMCOMM using
>> NBEMS, thereby keeping AO-91 as free as possible.  Once that has
>> run its course, then move on to another experiment. That would
>> keep things fresh.  I think a report on each experiment would be an
>> interesting series of articles in the AMSAT Journal.  I think
>> continuous experimentation is a good thing!
>> Mac Cody - AE5PH 
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