Condolences to the IRoQ crash victims

Well, this year’s International Rally of Queensland didn’t go the way everyone expected. We were there with Brisbane Area WICEN, providing the backup communications for the event. Our primary role was to relay the scores given to us by the post chief in the timekeeper’s tent. They looked after scheduling the cars, getting times, and sending the cars through. We just passed on scores (start/finish times) and other traffic.

Saturday went well. My father and I were set up at Kandanga North running the WICEN checkpoint for stages 6 and 12 of the rally. After some early hiccups getting the packet radio network going, we had the scores being sent out on time and everything running smoothly. Apart from some cows holding up traffic, there were no delays.

Sunday however… just about everyone would have heard about the fatality. My father and I ran the WICEN checkpoint at the start of the fateful Michell Creek Special Stage 14.

Having now seen the ABC website footage, looking at the competitor lists and my own logs, I can say with 90% certainty which car (and therefore 45% certainty who the deceased is) the unfortunate car was and when they left the stage.

My condolences go out to both driver and co driver at this difficult time.

Update: The names have been released.

Do’s and Don’ts of hand-held radios

During the International Rally of Queensland, it was interesting to observe how people made use of the radios provided for the event. In fact, watching peoples’ behaviour to me, made it clear that none of them had any training in how to use one of these devices. And they all struggled, mostly as a result of each others’ bad habits.

This isn’t an isolated case… my mother who works at the Brisbane International airport, often complains about the radio etiquette of her fellow colleagues. A lot of people have a radio thrust into their hands, and haven’t a clue how to use them. In trying to figure it out, they often fall trap to the same bad habits.

I myself have found a lot of this by mistake, and by observing others. A lot of this is also applicable to using regular telephones … I found the tip of standing still when talking helpful when I needed to make a call to emergency services on my mobile phone — the particular spot where I was at the time, the phone would drop out if I moved more than 6 inches in any direction. Learning not to talk too close, or too loudly into a microphone, also helps.

The following is a little chart I came up with. No, the stick figures are not XKCD grade, they’re not meant to be. Click on the image below for a copy as a PDF, or get the SVG source here.  File is provided in the public domain, but attribution would be appreciated.  If you use radios in your workplace, and observe this kind of behaviour in your colleagues, you might like to print this out and stick it on a wall somewhere.


Experiments with AX.25

This weekend just gone I was at Imbil helping out with the International Rally of Queensland, reporting scores for the car rally there.  This was my first look at packet radio in action.  Prior to this I had enabled the amateur radio options in the kernels I built, but never tried actually hooking radio to computer.  I shall be posting some notes on how I got this working…

zhouman ~ # uname -a
Linux zhouman #2 Wed Oct 13 00:42:58 EST 2010 mips64 ICT Loongson-2 V0.3 FPU V0.1 lemote-yeeloong-2f-8.9inches GNU/Linux
zhouman ~ # ifconfig sm0
sm0 Link encap:AMPR AX.25 HWaddr VK4MSL
inet addr: Bcast: Mask:
RX packets:365 errors:0 dropped:0 overruns:0 frame:0
TX packets:36 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:10
RX bytes:24236 (23.6 KiB) TX bytes:6850 (6.6 KiB)

zhouman ~ # mheard
Callsign Port Packets Last Heard
VK4EA-9 sm0 6 Mon May 16 17:59:12
VK4NRL-9 sm0 1 Mon May 16 17:58:40
VK4VP-1 sm0 8 Mon May 16 17:58:38
VK4RAI-3 sm0 9 Mon May 16 17:57:58
VK4TIM-9 sm0 14 Mon May 16 17:57:56
VK4TDI-1 sm0 2 Mon May 16 17:57:39
VK4DC-1 sm0 15 Mon May 16 17:57:07
VK4TEC-9 sm0 120 Mon May 16 17:56:08
VK4FY-1 sm0 18 Mon May 16 17:54:38
VK4RMO-3 sm0 1 Mon May 16 17:54:33
VK4RGC-3 sm0 3 Mon May 16 17:52:48
VK4RC-1 sm0 8 Mon May 16 17:51:29
VK4FIL-1 sm0 4 Mon May 16 17:46:44
VK4RIL-13 sm0 4 Mon May 16 17:45:43
VK4RBR-3 sm0 5 Mon May 16 17:42:59
VK2RDO-3 sm0 2 Mon May 16 17:41:19
VK4RRC-13 sm0 3 Mon May 16 17:36:39
VK2JUB-1 sm0 2 Mon May 16 17:34:44
VK4BNQ-1 sm0 1 Mon May 16 17:26:58
VK4LDA-9 sm0 2 Mon May 16 17:24:59
VK2POO-9 sm0 9 Mon May 16 17:21:24
VK2XFL-9 sm0 1 Mon May 16 17:21:09
VK4RSR-3 sm0 1 Mon May 16 17:20:04
VK4IE sm0 1 Mon May 16 17:15:04
VK4ALJ-3 sm0 1 Mon May 16 17:15:00
VK4HPW-9 sm0 5 Mon May 16 17:13:23
zhouman ~ #

Set-up consisted of:
Linux kernel on Lemote Yeeloong, latest soundmodem driver, Yaesu FT-897D, homebrew interface cable plugged into Yeeloong’s onboard sound card, USB serial driving BC547 in interface cable for PTT.

zhouman ~ # cat /etc/ax25/soundmodem.conf
<?xml version="1.0"?>
<configuration name="FT897-D">
<chaccess txdelay="150" slottime="100" ppersist="40" fulldup="0" txtail="10"/>
<audio type="alsa" device="plughw:0,0" halfdup="0" capturechannelmode="Mono"/>
<ptt file="/dev/ttyUSB0"/>
<channel name="Channel 0">
<mod mode="afsk" bps="1200" f0="1200" f1="2200" diffenc="1"/>
<demod mode="afsk" bps="1200" f0="1200" f1="2200" diffdec="1"/>
<pkt mode="MKISS" ifname="sm0" hwaddr="VK4MSL" ip="" netmask="" broadcast=""/>
zhouman ~ #

I’ve shut it down for now, but I’ll give it a bit more work on 145.175MHz tomorrow. Once I get something working, I might set something up using the O2 or one of the Fulongs (probably the latter) and see about getting soundmodem back into Gentoo.

Update: After hand-editing the ebuild to enable APRS support, I can successfully report that not only is soundmodem working, but so is Xastir on my Yeeloong, as can be seen on