On the air easy thanks to the Magic of Direwolf

Scott Currie scott.d.currie at gmail.com
Mon Apr 16 13:37:26 PDT 2018


On Mon, Apr 16, 2018 at 12:46 PM, Bill Vodall <wa7nwp at gmail.com> wrote:

> > OK, next test.
>
> > This is running VARA FM, the HF modem optimized for VHF FM links.
>
> Windows only?
>

​At this time, yes. I don't know if there are any plans to support other
environments.
​

>
> > First test, running the radios in "1200" mode on 145.030MHz. Ideal path,
> > radios are 15' apart. VARA FM stayed in 3rd gear, but still very good
> > *** Sent 1 message.  Bytes: 30800,  Time: 01:19,  bytes/minute: 23174
>
> > Next with the radios set to "9600" mode. VARA FM shifted all the way up
> to
> > 5th gear (top gear). This comes very close to 9600 packet!
> > *** Sent 1 message.  Bytes: 30828,  Time: 00:47,  bytes/minute: 38905
>
> 9600 was less than double the 1200 mode...  I sure wish they'd
> standardize on CPS..
>

​So, I'm looking at the bytes/minute count. Maybe not the most accurate
indicator, but I think good enough for comparison. If you look back to my
previous posts​, 9600 packet clocked in at about 41k bytes/minute.


> Was this with Discriminator flat audio or 'real' audio?
>

​When I say "1200" mode, that would be pre/de-emphasis audio​ (speaker/mic
connections). "9600" mode would be flat audio (discriminator/modulator).


> Is there a middle mode that would work with radios that don't have
> flat audio?  To get something (3600?  4800?) better than 1200.
>

​So, the 3rd gear results I got above, in "1200" mode, beats 4800 PSK. The
author thinks we should be able to do better, and is sending me some beta
to test.

-- 
*-Scott*
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