[aprssig] Interesting Findings - 300 Baud AX.25 on VHF-FM APRS
Stephen H. Smith
wa8lmf2 at aol.com
Mon Apr 4 13:40:00 CDT 2016
On 4/4/2016 11:27 AM, Fred Hillhouse Jr wrote:
> What I could really use is a tiny single board computer ala Raspberry Pi
> can run normal Intel x86 OSes and software.
> Not quite a single board PC but closer.
> Kangaroo Mobile Desktop Computer KJ2B#001-NA Intel Atom X5-Z8500 (1.44 GHz)
> 2 GB LPDDR3 32 GB eMMC Windows 10
Interesting... I love small form-factor PCs and have played with them for
over a decade as APRS appliances like digipeaters, igates and APRS webservers.
The Kangaroo device appears to be basically an Intel-Atom-powered Windows
tablet minus the screen. I have used devices similar to this -- see my review
of the Microcenter TW-700 Winbook tablet here:
It is a very useful building block for ham applications like digipeaters,
igates, mapping APRS clients, etc since it will run standard Windows software
in an ultra-compact form factor.
In fact, my 300 vs 1200 baud testing used a Winbook running the UZ7HO
Soundmodem at the receiving end, connected to a Yaesu FT-1500 transceiver.
Comparing the Kangaroo to the Winbook tablet:
Kangaroo is $100 Winbook TW-700 lists at $80 on it's website, but is often
available in Microcenter stores for $60-70 new on promotional blowouts, and as
open box / returns for $50-60.
The Kangaroo has more RAM and flash memory "hard drive" than the Winbook.
. 2GB RAM vs 1GB 32GB flash vs 16 GB
Two FULL-SIZE USB ports (one USB 3.0) on provided docking adapter of Kangaroo
vs one FULL-SIZE directly on body of Winbook. (Winbook has second, micro-USB
port, normally used for charging.)
Kangaroo dock also provides standard full-size HDMI port, while Winbook has
micro-HDMI directly on body.
The Kangaroo chassis runs directly off 12 VDC making it nice for mobile ham
applications. Winbook requires 5 VDC external power from wall-wart or
external 5VDC USB car charger.
According to specs, Kangaroo external 110/220VAC power supply provides 3A at 12
VDC, implying power consumption is probably around 25-30 watts. User reviews
are commenting on how hot it gets. I have measured Winbook power consumption
via 12VDC-->5VDC USB car adapter at around 10 watts (less than 1 amp) from 12
VDC system. No detectable warming - it could be stuffed into closed spaces
like my ammo-can tracker without problems. The Winbook can run autonomously
on it's internal battery for almost 6 hours.
And of course, the Winbook has a built-in "half-HD" 1388x720 display - handy in
field settings where you don't want to bother with an external monitor. The
Winbook can output a 1920x1080 full-HD image to an external HDMI display. (I
now routinely use the Winbook plugged into my Acer full-HD projector for ham
club presentations and swap meet demos, instead of lugging a larger laptop.)
My conclusion is that for stationary applications, the greater number of ports
on the Kangaroo combined with it dock would be a better choice. For
in-the-field applications, the Winbook, with all it's ports directly on the
body of the device, a built-in display, and lower power consumption would be
Stephen H. Smith wa8lmf (at) aol.com
EchoLink: Node # 14400 [Think bottom of the 2-meter band]
Home Page: http://wa8lmf.net
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