[RFI] 433 MHz Wireless Thermometer

[Peter D. Vouvounas]

Dale et al,

I looked around 433.92 MHz in my area and so far I've seen about six very
low level signals approx. -110dBM with very short duration bursts.

I listen to 432.100 MHz in the shack extensively and never noticed them in
this area.  I do often receive a signal here on the Jersey Shore that runs
from S1 to 30db over S9 sweeping across a broad range of frequencies.  It
sounds like some type of alien attack ( best guess it's military in nature).
One day I'd like to find out exactly what it is...

73

PeterV [REN] WB3FSR
=========================================
Peter D. Vouvounas	Ofc: 732-701-1130
McLeod USA			Cell:732-674-4001
98 Meridian Dr.
Brick, NJ 08724
Mailto: wb3fsr@home.com
InterActive 2way: wb3fsr@imcingular.com
=========================================


-----Original Message-----
From: rfi-admin@contesting.com [mailto:rfi-admin@contesting.com]On
Behalf Of dgsvetan@rockwellcollins.com
Sent: Tuesday, December 18, 2001 09:12
To: ctj92@cableone.net; rfi@contesting.com
Subject: Re: [RFI] 433 Mhz Wireless Thermometer



Charles,

I believe your posting is the first I have seen in which interference TO
the device, from amateur radio transmitting, is indicated.  Being both a
weak signal op (SSB and CW) and FM op on 70 cm has had me wondering what
effects these devices have on (or from) operations in the band.  I rather
expect that transmitting at anything greater than QRP  levels will likely
result in interference to the receiving device (especially if you run high
power on 432.1 or fast scan ATV).   Ed Hare, W1RFI, has indicated that the
transmit devices are relatively clean and stable.  Luckily, 433.92 is
well-removed from 433.1, so it is reasonable to expect that our receivers,
typically having good to excellent selectivity, will not be bothered unless
some specific device drifts seriously off frequency or has a very "dirty"
output spectrum.

I would be interested in knowing if any 70 cm ops, weak signal or
otherwise, either have these devices in and around their house or have
nearby neighbors with such devices.  Interaction comments would be useful.
Thanks.

Happy Holidays and 73,

Dale, WA9ENA




"Charles Johnston" <ctj92@cableone.net>@contesting.com on 12/17/2001
10:23:27 AM

Sent by:  rfi-admin@contesting.com


To:   <rfi@contesting.com>
cc:

Subject:  Re: [RFI] 433 Mhz Wireless Thermometer


   I have had a wireless indoor/outdoor thermometer in use here at my
station. It is from radio Shack and it also operates on the 70cm band
within FCC regs.   It is quite nice setup with large easy-to-read
numbers. It is so nice we got one as a gift for my dad.

  Since this is the RFI list let me say that if I am on 2M (45w) in the
shack for extended periods it does temporarily disable the unit.....

- photos of this guy on my web site

73  /  DX

Charles T Johnston
Prescott, Arizona - U.S.A.
charles@ab7sl.com

AB7SL -  Ham Radio Pages
Official W9INN Antennas Page
www.ab7sl.com





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