This document describes an Ethernet-based coaxial switching system developed by S. Lerdnantawat and W. Amasiri of the Department of Electrical and Computer Engineering at Thammasat University. The system uses an OMRON G2RL-1-E relay to switch between different radio antennas and allows control via an Android application, PC application or web browser. It provides monitoring of connection status, switching status and IP address.

1. Ethernet-Based
Coaxial Switching System
S. Lerdnantawat
W. Amasiri
Department of Electrical and Computer Engineering
Faculty of Engineering Thammasat University
W

2. Amateur Radio
2
Contest
Experimental
Public Service
Education
S.Lerdnantawat , W.Amasiri
W

3. PT5T Amateur Radio Station, Araucária Dx Group
Brazil3S.Lerdnantawat , W.Amasiri
W

4. Amateur Radio
Frequencies Allocation
4S.Lerdnantawat , W.Amasiri
W

5. One Antenna ?
Frequency Radiation Pattern VSWR COST
5S.Lerdnantawat , W.Amasiri
S

6. 6
Horizontal Plane
Land Radio
Vertical Plane
Maritime Radio<500 KHz Bandwidth
Frequency Problem Polarization Problem
High Reflect
Power !!!!
Anytone AT-5555
28.00 – 30.00 MHz
S.Lerdnantawat , W.Amasiri
S

7. Coaxial Switch
7S.Lerdnantawat , W.Amasiri
S

8. Coaxial Relay
249 Dollars
Coil Voltage
115 VAC !!!
8S.Lerdnantawat , W.Amasiri
S

9. Jim Klitzing , W6PQL
OMRON G2RL-1-E
9S.Lerdnantawat , W.Amasiri
W

10. S.Lerdnantawat , W.Amasiri 10
*รายงานความคืบหน้า หน้า 29
Return LossInsertion Loss
W

11. Ethernet-Based
Coaxial Switching System
11S.Lerdnantawat , W.Amasiri
W

12. 12S.Lerdnantawat , W.Amasiri
Yaesu FT-897
S

13. Switching Controller Android Application PC Application
13S.Lerdnantawat , W.Amasiri
S

14. OMRON G2RL-1-E
Switching Controller
RF Part
UHF Connector , PL-259UHF Connector , SO-239 14S.Lerdnantawat , W.Amasiri
S

15. Switching Controller
15S.Lerdnantawat , W.Amasiri
W

16. 16
Switching Controller
Modular Design
S.Lerdnantawat , W.Amasiri
W

17. Switching Controller
17S.Lerdnantawat , W.Amasiri
W

18. Switching Controller
- Connection Status
- Switching Status
- IP Address
-Web Server
-HTTP Response
[ Get Method ]
18S.Lerdnantawat , W.Amasiri
W

19. 19
http://192.168.1.177/?XXX=NaN&YYY=NaN
TCP/IP
Hypertext Transfer Protocol
Request Methods
GET Method
Android : ?adrmon , Labview : ?pcmon , Web Browser : ?webmon
S.Lerdnantawat , W.Amasiri
W

20. S.Lerdnantawat , W.Amasiri 20
S

21. S.Lerdnantawat , W.Amasiri 21
W

22. S.Lerdnantawat , W.Amasiri 22
Additional Feature
- Last Switching Status Memory [ Done ]
- Static IP and Dynamic IP Mode [ Done ]
- Config Static IP Address [ Planning ]
- Automatic Switching , LOG [ Planning ] etc.
W