Yes , walking round in the dark looking
for corona arc's from the Ae system is a
little disconcerting , especially if you have
cables routed inside buildings , where 'hot' spots
could be nu-observed
Well , the best fire suppression I have
see (in action and never in action) both of which
are ' heat triggered mechanical - fail safe'
Rally cars , with a GAS
extinguisher , with pvc pipe
routed round the engine bay and inside
the car , where a fire breaks out , melts
the pipe and fires the extinguisher , can
have multiple exit points if the pipe is ruptured
in more than one place -
Under ground (mining) power distribution ,
portable Sub-Stations had a 'large' fire
bottle and solid pipe distribution system, with
a 'nylon' cord connected to the valve , with
a 'big' weight , if there was a transformer
'fire' the nylon cord melted , weight
activated the 'long leaver' valve by gravity
and the whole bottle discharged into
the equipment
Unfortunately BCF is no longer legal (
but I think still used in aircraft and other
last ditch systems) ideal medium
If the coil is in a B+Q shed , them may be
either system would work , but the pvc
pipe method could be simper to arrange
?
G..
Sent: Sunday, November 25, 2012 9:53 PM
Subject: Re: LF: Off air due to fire
Hello Mike,
I'm very sorry to hear about that! You're the
most active station in the UK these days so it's a big loss in this season :-/
At least you have the insurance and there are no human losses! Maybe it is a
warning to other active stations.
An alternative to a smoke warning
device could be a alarm bell that starts to run when the PTT is pressed but the
PA current is below a certain adjustable threshold. It is not difficult to
realise, a simple comparator and a relay that switches the bell, for example.
This bell will start to run when the wire falls down or the antenna is strongly
out of resonance and so on, which may be helpful as well. E.g. it prevents a
blow up of a class E PA due to dramatic mismatch in case of heavy load of snow
on the TX system and so on. Of course the relay could disable the PTT as
well!
73, Stefan/DK7FC
Am 25.11.2012 20:26, schrieb IZ2JGB:
sorry for the damage Mike. for all of us running txes near
the house it may
be worth checking a suitable smoke/ion
detector to mount near the tx and the coil. they cost nothing , are
available
off the shelf and are pretty realiable.
look:
73,
Giorgio
Inviato da iPhone
Il giorno 25/nov/2012, alle ore 18:54, "Mike Dennison" <
[email protected]> ha
scritto:
I am currently off the air following my loading coil catching
fire and damaging the house. I have had to take my mast
down to allow access to the builders who are repairing the
damage. Fortunately I was insured.
Hopefully I will be able to receive before
Christmas and transmit again some time in January.
Details and pictures are on my blog
at:http://g3xdv.blogspot.comMike,
G3XDV
