[Date Prev][Date Next][Thread Prev][Thread Next] - [Date Index][Thread Index][Author Index]

Re: 2.4GHz QRM



In the U.S. the repeaters are on 438-450 MHz and 434 MHz fits nicely between
the weak signal and satellite segments. The potential problem is setting off
an alarm in your own car or those next to you by interfering with the RFID
signal.

73,

John
KD6OZH

----- Original Message ----- 
From: "Tony Langdon (ATC)" <tlangdon@atctraining.com.au>
To: "'Emily Clarke'" <emily@clarke-design.com>; "'amsat-bb@amsat.org'"
<amsat-bb@AMSAT.Org>
Sent: Wednesday, August 02, 2006 04:42 UTC
Subject: RE: [amsat-bb] 2.4GHz QRM


> > I'm a little concerned about the message here - are you saying that
> > RFICs in 434 MHz will encroach on our allocation in 435-437?  These
> > are minuscule power devices (since, for example, sitting on the
> > freeway I don't want to get warnings about the tire pressure of
> > another Volvo 1/2 mile away.) So before I get all bent out of shape
> > by this can you provide some credible data or (ugh) statistics that
> > it will have any real impact in the next 20 years?
>
> I suspect these will cause you guys few issues.  Over here, 434 MHz
devices
> are a real problem, but it's not the door bells, garage door openers or
the
> vehicle remotes that are causing the problems, but it's the hiher powered
> high duty cycle devices (they're allowed up to 25 mW EIRP) that cause all
of
> the problems, cordless headphones and industrial crane controllers being
the
> worst offenders.  All made worse by the fact that this part of the
spectrum
> overlaps most of our repeater inputs. :-(
> ----
> Sent via amsat-bb@amsat.org. Opinions expressed are those of the author.
> Not an AMSAT member? Join now to support the amateur satellite program!
> To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org
----
Sent via amsat-bb@amsat.org. Opinions expressed are those of the author.
Not an AMSAT member? Join now to support the amateur satellite program!
To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org



AMSAT Top AMSAT Home