Radio Static from Furnace

Radio Static from Furnace

Post by Jill Dyb » Wed, 14 Sep 1994 05:37:29

Hi--
I dread the coming Winter 'cuz when our furnace kicks in the
resulting static on my DX-440 makes it impossible to listen.
Also, last Summer our house was struck by lightning & my
radio hasn't been the same since. On the tropical bands &
below it's mostly just buzzing.  Are there ways to fix
these problems?  Wasn't there a thread on this?  I have
to telnet to read news, & post by e-mail so its hard for
me to keep up....
Thanks
Jill

 
 
 

Radio Static from Furnace

Post by SMack » Wed, 14 Sep 1994 06:26:02


Re the furnace.

With the furnace running, try a little WD-40 on the relay contacts on the
side of the boiler. Worked for me .

CAUTION !!  WD-40 is very flammable.
Dont blame me if you loose a few eye lashes.

 
 
 

Radio Static from Furnace

Post by David W. Bar » Wed, 14 Sep 1994 10:14:08


>I dread the coming Winter 'cuz when our furnace kicks in the
>resulting static on my DX-440 makes it impossible to listen.
>Also, last Summer our house was struck by lightning & my
>radio hasn't been the same since. On the tropical bands &
>below it's mostly just buzzing.  Are there ways to fix
>these problems?  Wasn't there a thread on this?  I have
>to telnet to read news, & post by e-mail so its hard for
>me to keep up....

Could be a furnace problem caused by a faulty electronic ignition.
When I lived in a house with oil heat, the electronic ignition would
make a short burst of static when the furnace first started.  There is
no need for the ignition to be running constantly, as the oil can keep
itself burning once it gets going.

--
David Barts  N5JRN                      UW Civil Engineering, FX-10

        0112 GMT T: 66 F wind: NW 4 gust 6 mph P: 1017 mbar

 
 
 

Radio Static from Furnace

Post by Martin Gu » Sat, 17 Sep 1994 05:37:47

: Hi--
: I dread the coming Winter 'cuz when our furnace kicks in the
: resulting static on my DX-440 makes it impossible to listen.
: Also, last Summer our house was struck by lightning & my
: radio hasn't been the same since. On the tropical bands &
: below it's mostly just buzzing.  Are there ways to fix
: these problems?  Wasn't there a thread on this?  I have

Some electronic ignition systems in furnaces use an RF oscillator to
drive a high voltage generator. The system feeds high voltage RF at
maybe 1 MHz through an electrode that's spaced about a quarter inch
above the burner. When the flame is present, the air is easily ionized,
and a continuous RF arc is formed between the electrode and the burner.
So, while the flame is on, the arc is continuous, and the circuit can
detect that current is being drawn by the arc. If the flame goes out,
the potential isn't enough to ionize the cool air, so the arc fizzles
out. The circuit detects this and shuts off the gas. The whole time
this gizmo is running, you'll have lots of interference.

More and more new stuff seems to be coming out that generates a lot
of RF noise, these furnace igniters being one of them. I can't wait
for the new RF light bulb (RF e***s a phosphor inside the globe).
These are on the verge of coming on the market, and should trash SW
listening worse than the noisy electronic fluorescent bulbs they now
sell. Maybe it's best to freeze in the dark while listening. That
would provide a good excuse to get a nice, warm tube radio!


 
 
 

Radio Static from Furnace

Post by Bret Penningt » Sat, 17 Sep 1994 06:11:29

Is there such a thing as a shield you could put up between
you and the furnace?
 
 
 

Radio Static from Furnace

Post by Martin Gu » Sat, 17 Sep 1994 23:39:30

: Is there such a thing as a shield you could put up between
: you and the furnace?

The problem is that when you have a 15,000 volt arc, it's pretty tough to
put up a shield to keep small amounts of RF from escaping. Keep in mind it
only takes a few microvolts of RF radiation to trash AM and SW reception.
A fully seam welded vault around the furnace would work, though!

Martin Guth