aprs is a digital operating mode that allows the monitoring of real time geographical information such as
the position of vehicles, the status of weather, radio direction finding and much much more.



all you need is a vhf-radio, a gps-receiver and a tnc. kenwood has started to build some radios that have a
built-in tnc, some of these models are the th-d7, tm-d700 and tm-d710. now almost all other companies like
yaesu, alinco, ... have a handheld or mobile radio that is aprs-ready. if you have one of these radios you only
need a gps-unit and you are all set to start in aprs.

your aprs-signal will be received by a local aprs-digipeater and resent on the same frequency. in europe the
frequency is 144.800 mhz. there are a lot of aprs-gateways active which send the received data to the internet.
so everyone can track your movements in real-time. it is also possible to send short messages to other hams.

mobile and portable stations should use WIDE 1-1 (1 hop) or WIDE1-1,WIDE2-1 (2 hops) and fixed stations
WIDE2-1 (1 hop) or WIDE2-2 (2 hops)
as their aprs-path. in regions with good aprs-infrastructure you should
consider reducing your path to avoid unnecessary traffic.

paths like RELAY,WIDE,TRACE7-7 are not good and only occupy the frequency ... and such settings are making
it harder for portable, qrp and mobile stations to get into the aprs-network. also think about how often your beacon
is transmitted. for fixed station it's not necessary to transmit the aprs-beacon every 5 minutes, it's enough to send
it every 30 or 60 minutes. for mobile and portable stations an intervall of 1-2 minutes should be appropriate.

more detailed information and real-time-maps are available on http://aprs.fi

in 2012 i started an i-gate with the callsign OE5REO-10 at my home-qth. the hardware is a kenwood tm-d700
with a wx3in1 tnc. it is running 24/7 and is also capable of digipeating messages.

in my car i have a kenwood tm-d710 running. the callsign i use for mobile operation is OE5REO-9. i am standby
on 145.500 during driving. the aprs-beacon is transmitted every minute on 144.800.

i like to climb mountains and activate sota summits ... when i do so i take my kenwood th-d72e handheld with me
and transmit my current position during the hike. the portable call in aprs is OE5REO-7. i often have problems
getting my beacon out into the network, that is why i am currently working on a portable rx-only i-gate.