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projects:openwrt:info [2014/01/12 13:12] (current)
jann created
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 +The Linksys WRT54GS WLAN-Router is a powerful cheap device useable for hamradio. It is about 75,- €, but you have to care which subversion you buy. Please check http://​ and http://​​index.cgi/​LinksysWRT54GS for further details about flash memory and capabilities to use OpenWRT.
 +Arsene, LX1TB has modified the Linksys WRT54G(S) models to tune the frequencies below 2400 MHz for better fit with the hamradio bandplans ;-) Look on his german website to get the details: http://​​~lx1tb/​wrt54gs/​.
 +The WLAN-Router has a MIPS 200 MHz CPU, 32 MB RAM, 8 MB Flash, WLAN 802.11b, a 5-port switch and 2 serial ports which have to be upgraded by hand (without hardware handshake). See http://​​wrt54gs/​serial.html for the serial modification. The ports support up to 460k8 serial transfer rate !!
 +The WRT54GS for hamradio usage has been presented at the 21th international packet radio meeting in Darmstadt, Germany. There'​s a German summary available: [[projects:​openwrt:​info:​prtagung|Packet Radio Tagung 2005]] (nice pics if you can't read German ;).
 +Some useful hints for hamradio operators:
 +  * The serial modification is just a MAX3232 (3.3Volt) and five 0.1 µF tantal capacitor (if you need serial speed >115k2 DD4RD suggests to use a MAX3380 which can be obtained at http://​ for example).
 +  * On my WRT54GS /​dev/​tts/​0'​s default IRQ is 3. /dev/tts/1 is set to IRQ 0. To set /dev/tts/1 to IRQ 3 use setserial. Add "src florian http://​"​ to ipkg.conf and install setserial with "ipkg update",​ "ipkg install setserial"​. Run Setserial: "/​bin/​setserial /dev/tts/1 irq 3". Now you can use /dev/tts/0 AND /dev/tts/1 for any serial device at the same time.
 +  * To initialize a Kenwood TH-D7 for KISS-Usage I have a ugly workaround. First Start Digi_Ned with "​digi_ned -p /​dev/​tts/​0:​9600:​1"​. After startup cancel operation with CTRL+C. The serial ports keeps initialized with 9k6. Now send the TNC-commands for switching to KISS: echo -e "​\015softdcd on\015kiss on\015restart"​ >/​dev/​tts/​0. The TH-D7 will indicate changing to KISS by blinking STA CON on the display.
 +  * The wireless bridge will NOT work in ad-hoc or clientmode ! You have to use WDS and AP-Mode for bridging !!
 +  * Get "​wl"​ for using one antenna for TX (wl txant 1) and the other for RX (wl antdiv 0). 0 = antenna @dc-plug, 1 = antenna @reset-switch. Add "src ab0oo http://​​wrt54g"​ for getting an archive with "​wl"​ (ab0oo is also a hamradio operator ;)
 +  * You can adjust TX-Power with "wl txpwr 0-255" up to about 160mW. "wl txpwr 100" and above will cause some by-products. Be careful not to overheat the device. Here's a little table (round about):
 +|wl txpwr |mW |
 +|0 |0.5 |
 +|3 |3 |
 +|6 |5 |
 +|17 |12 | 
 +|30 |25 |
 +|70 |50 |
 +|200 |125 | 
 +|250 |160 |
 +Adding an SD card reader to the WRT54G: http://​​
 +73 de DG8NGN, DL5RB & DL9SAU
projects/openwrt/info.txt · Last modified: 2014/01/12 13:12 by jann