[OZAPRS] RE: New wheels - dare I use anything that transmits?

Michael Carey 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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