First Week of March

Hello All,
Tetra system evaluation continued this week, building on the successes
of Feb 23.

Because full-duplex calls utilize more system resources, they are ideal
for detecting system range from the base station. We drove out to
fringe areas, and made some phone calls to voice mail to record
ourselves, listening for any drop outs or system failures. We didn't
detect anything out of the ordinary.

We also installed external antennas at our main office to work with the
Tetra radios. We are inside a completely metal building about 8 miles
from the tower, and that was causing some signal loss. This too is
expected, as the analog system suffers from the same RF rules and
constraints... an analog radio has the same challenges getting into the
repeater as the Tetra does.

On March 3, I built a VPN circuit so that the Dispatch laptop could now
be used outside of the local network, allowing for a demonstration
anywhere internet connectivity is available. We tested the setup with a
full duplex telephone call, and walking around the office listening to
it via a wireless network.

Finally, we welcomed Alexander from Rohde and Schwarz to Green Bay. He
is a Product Manager for Accessnet-IP, the large-scale Tetra system, and
he visited our installation of the pilot system.
Until Later,
Christian