[K3PZN-List] Remote Car Start Interfere with Amateur Radio

[Blank, Dave E]

However RF overloading the front end (first RF stages) may still have a
very negative effect. Spread spectrum is merely frequency hopping or
sometimes referred to as frequency agile it spends milliseconds on a
predetermined frequency list moving channel to channel. The output of
the alarm is most likely in the miliwatts but your 70cm is as you know
very much higher. My guess, continued use of the radio will eventually
wipe out the alarms receiver. I would have it removed. Even in the off
position I have seen RF get rectified and still smoke the receiver. We
had to abandon some SCADA application due to this exact effect even
those they were in the commercial band (450Mhz).
Just my opinion! KB3DSK

-----Original Message-----
From: k3pzn-list-bounces at mailman.qth.net
[mailto:k3pzn-list-bounces at mailman.qth.net] On Behalf Of Neeriemer, Bill
(NIH/NLM/LHC) [C]
Sent: Wednesday, August 01, 2007 5:41 PM
To: Carroll County Amateur Radio Club
Subject: [K3PZN-List] Remote Car Start Interfere with Amateur Radio

All-

 

I recently purchased a car with a Viper 790VX alarm/remote start system
installed.

 

I called the alarm dealer, and they stated that they don't think it'll
be a problem because the Viper uses spread spectrum to eliminate
interference.

 

According to the Alarm owner's manual, they center on 435 MHz, which is
in the 70cm band.

 

My concern is that if I install my 70cm mobile, and pound that receiver
with watts of RF in the same band that it is using, it may croak.

 

The receive antenna is just inside the windshield at the top center.

 

I'm not sure where the alarm controller is.  Probably the trunk.

 

My understanding is that the Viper is in control, and so if it locks up,
I can't over-ride it.

 

Should I have it pulled before I use the radio?

 

Suggestions?

 

73 Bill W3STG

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