TEST

1
TEST

• of Radio Modems and WLAN
• Jeppe Søndergaard Larsen

2
Requirement specification

• Radio Modem
• Transmit a least 3 km.
• Transfer 208 bytes with 5 Hz (8320 bps).

3
TEST

• Two test for the Radio Modems
• Along Limfjorden
• On the beach in Blokhus
• One test for the WLAN

4
Radio Modem Test along Limfjorden
Level crossing
Flydedokken
5
Results of Radio Modem test

• Only every ninth ping packet received.
• A second test with SCTP package was canceled.
• SCTP was tested on a shorter distance of 500 m
• Transmission frequency of 4,43 Hz.
• 56 of the maximum rate of 19 200 bps.
• The requirement specification is not fulfilled.
• Possible because of The Fresnel Zone, or poor
  Radio Modems.

6
The Fresnel Zone

• Radio LOS
• A least 60 must be free for obstacles
• Radius

• d2.4km, f2.4GHz gt r8.66m
• Only 60 has to be free gt 5.2m

7
Radio Modem Test in Blokhus

• Worse than expected.

8
Results of WLAN test

• Better than expected.