[OZAPRS] RE: New wheels - dare I use anything that transmits?
michaelcarey at internode.on.net
Wed Aug 27 21:18:40 EST 2008
Speaking of interference from amateur transmissions to cars,
occasionally, I like playing "Revenge on the LIPD's".
We all know the issues that LIPD's have caused to amateur repeaters,
personally I had to shift the VK5RPL 70cm repeater to a new frequency
pair that wasn't affected by industrial crane controls and kids walkie
talkies. Others have had to limit repeater access with CTCSS.
I've since found that many car immobiliser/remote entry systems work on
433.920 Mhz (within the LIPD band) and many won't work when the area is
blanketed with 50W on 433.920!
There is nothing quite like sitting in the carpark of a supermarket on a
rainy day with the trusty dual band radio keyed up on 433.920 MHz and
seeing how many people get frustrated and wet, trying to get into their
cars by remote control! Sometimes, the remote entry is part of an alarm
system and entry into a vehicle (with the key in the door) without
disarming it will set off the alarm. Other cars, especially European
cars, have the anti-theft system "talk" to the remote key fob, and when
the cars security system can't talk to the key fob when the ignition is
turned, the car won't start.
Of course, I ALWAYS identify with my callsign at the beginning of each
transmission and then again every ten minutes, as per the rules.
I know, I know... it's childish, but I didn't make the decision to put
LIPD's into an already congested part of the spectrum... anyway, I could
be trying to legitimately access a repeater on 438.925 (-5 MHz
offset)... well, that's my excuse and I'm sticking to it! (-:
Dave Horsfall wrote:
> On Tue, 26 Aug 2008, Shaun Pitcher wrote:
>> No Prob with my XR6T at 50 watts to a 5/8 or 1/4 vert on the bonnet. I
>> do plan to put two earth straps on the bonnet to the body as I get
>> engine noise on receive and the bonnet is not that well connected to the
>> rest of the body.
> I've had no problem with any of my steeds ever since I was licensed back
> in '83, both old and new cars (but not so new that air-bags were fitted,
> because I have a problem with the concept of a bomb waiting to go off in
> my face).
>> I can however set off the local newsagents alarm with a well positioned
>> beacon (parked out the front). Must try the VN commodore thing next
>> time I am on the freeway!
> I could set off car alarms in shopping centres, particularly the ones (the
> alarms, I mean) designed by ETI. Could also set off a neighbour's front
> door-bell too, as I drove past it...
> -- Dave
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> Ozaprs at aprs.net.au
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