[RFI] RFI & Alarm Systems?

[qrv at kd4e.com]

You could try a big 440 amp in your mobile and see how good their
incoming filters are ... the problem may resolve itself when they
protect it against incoming overloading they will also stop their
unintentional illegal jamming 'broadcasts'.

> : There is one I drive by nearly every day that wipes out a portion of the
> : 440 band.
>
> What exactly are you hearing from it?  Intentional RF or incidental?  There
> is an ISM band (Part 15) from 433.05 to 434.79.  I usually monitor 433.925,
> 434.000 and 434.500, but I have equipment operating throughout that range.
> Almost forgot 418 MHz, lots of stuff there.  Alarms operate throughout the
> spectrum.  I have a transmitter next to me that operates from 150 - 276 KHz.
> Then there was some stuff around the AMBC band, article surveillance systems
> throughout HF, MILLIONS of devices covering six decades around 27 MHz, then
> 49 MHz, also some stuff around 33, 40, 72 and 76 MHz, 150 MHz, 210-215 MHz
> or so,
> 250, 275, 290, 303 and 308 are quite common, as are 315 and 318 MHz, then
> there was the stuff in the 80's that didn't change codes, but frequencies,
> 290-410 or so if I recall correctly, 434 is common, commercial stuff around
> 450-470 MHz, the entire analog cellular band, but 868 MHz is the most common
> now, throughout 902-928 with stuff centered on 915 MHz being the most common
> and now 2.4 GHz where the garbage out there exceeded all other bands
> combined long ago!
>
> If you want to know what frequency your equipment operates on, check the FCC
> ID database:
>
> http://transition.fcc.gov/oet/ea/fccid/
>
> Kurt


-- 

Thanks! & 73, KD4E.com
David Colburn nevils-station.com
I don't google I SEARCH! duckduckgo.com
Network: groups.yahoo.com/group/qrv
Restored to design-spec at Heaven's gate 1Cor15:22