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PA2AGA > PACDIG 16.05.99 06:09l 116 Lines 4692 Bytes #-9861 (0) @ EU
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Date: Sun, 16 May 99 00:21:27 MET
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Subject: PacketRadioDigest 99/107B
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specific to this spam.
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>.
------------------------------
Date: Thu, 13 May 1999 15:39:48 GMT
From: busi256@goplay.com
Subject: free
Get free things (samples, catalogs, books, games ...) over the
Internet.
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>.
------------------------------
Date: Fri, 14 May 1999 01:38:42 +0100
From: "Tony Evans" <tts@globalnet.co.uk>
Subject: Radio Fire Alarm & Radio Security Alarms
Hi all,
For those who had chance to visit IFSEC or FIREX UK glad you made it! A
good turnout this year but a little quite on some days compared to previous
years but much of the blame was down to traffic accidents on the nearby
motorway network - so I am told.
Plenty of variations on themes already available but nothing I see was on a
"must have" basis. Radio CCTV certainly is moving towards a cost effective
solution and the range and quality of the signals has improved a lot over
recent years. Some are covering over 5 km. The low end of the market for
radio security systems of the low power with low range devices aimed at the
homeowner or small office etc.are in plentiful supply. Of course many of
these systems are unmonitored and rumour has it that the most common
frequency in use at 418 MHz is about to see a turn up for the worst as the
new TETRA systems will begin their spread spectrum transmissions which will
wreck havoc on some cheap receiver front end devices. Many owners of the
car alarms using this band will find themselves locked out! More on this
when I find out or perhaps someone in the know can enlighten me some more.
Anyhow, the radio fire alarm systems are few in numbers but strengthening in
the technological breakthroughs. No new entries in this year but at FIREX
battery powered radio sounders have always been a big design hurdle due to
the fact that both a transmitter and receiver are required. One to return
status signals and of course one to listen for alarm signals and system
integrity tests. The last couple of years have seen some big gains by
extensive use of lithium battery technology, widening duty cycles on
receiver wake up time and now use of low power 3 volt receivers and
processors used in the GSM phone chipset. The battery life now is
approaching in excess of 5 years with smoke and heat detectors battery life
approaching 10 years. These systems are not to be confused with the
household smoke detectors with PP3 batteries in. These systems are
commercial specification systems to BS5839 part 4, EN54-2 with CE
approvals. The big first at FIREX this year was to incorporate the alert
sounder into the base of a smoke or heat head. Now this is no new idea but
achieving this with battery radio technology is no mean feat! This is ideal
for hotels and B & B's which need the 75 Decibels at the bedhead.
The big difference between the two apart from cost is the fact that with
commercial systems, everything is monitored. This includes aerial systems
mains supply, devices etc. and there are at least 2 batteries in each device
and most hardware is tamper protected. The devices report back to the
control panel every few minutes a check signal to ensure that everything is
OK. Loose more than a few minutes worth of these check signals and the
control panel will beep loudly to let you know something is wrong. Of course
in practise and with a well conducted radio survey these events are unlikely
to happen.
The big benefits are obvious to most. There quick to install, need no ugly
wires except for mains to the control panel. Meet all the standards required
for small or large commercial use and I do mean large as London Stansted
Airport now make extensive use of radio systems. The technology is getting
cheaper and labour costs are increasing so radio is becoming the more
popular choice.
Perhaps you have an application in mind or just want to know more on radio
security or radio fire alarm systems then pop along to our website.
http://www.ttsfire.co.uk
>.
------------------------------
End of Packet-Radio Digest V99 #107
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