O.T. Microwaves

This not related to TV's but to sound. Expect some nice person on this NG
will know and share the answer. When music is streamed from the computer to
the Roku Box in the kitchen it stops working when the microwave oven is in
use. Tried moving the Roku etc. but to no avail. S'pose I could try moving
the microwave. BUT, should this happen? Is the Microwave 40? Is it
dangerous?
TIA

--
John the West Ham fan

housetrained wrote:

the Roku Box in the kitchen it stops working when the
microwave oven is in use.

Domestic microwaves (and many other devices) use the same 2.4Ghz
frequency as WiFi.

WiFi uses about 1/4 of a Watt, a typical microwave about 850 Watts,
there will be a a small amount of leakage from the microwave that's not
enough to worry about, but which will destroy the WiFi signal,
especially as it sounds like your Roku box is closer to the microwave
than to the computer (or WiFi access point if you have one).

On 16 June, 11:58, Andy Burns wrote:
housetrained wrote:
the Roku Box in the kitchen it stops working when the
microwave oven is in use.

Domestic microwaves (and many other devices) use the same 2.4Ghz
frequency as WiFi.

WiFi uses about 1/4 of a Watt, a typical microwave about 850 Watts,
there will be a a small amount of leakage from the microwave that's not
enough to worry about, but which will destroy the WiFi signal,
especially as it sounds like your Roku box is closer to the microwave
than to the computer (or WiFi access point if you have one).

So if you got enough WiFi routers together, could you cook a Chicken?

In article , housetrained
scribeth thus
This not related to TV's but to sound. Expect some nice person on this NG
will know and share the answer. When music is streamed from the computer to
the Roku Box in the kitchen it stops working when the microwave oven is in
use. Tried moving the Roku etc. but to no avail. S'pose I could try moving
the microwave. BUT, should this happen? Is the Microwave 40? Is it
dangerous?
TIA


If your streaming over a wi-fi thats on 2.4 Ghz then it shouldn't be too
difficult to conclude what frequency your microwave works at..

Sometimes some models leak more than others even if they are inside the
permitted or considered safe levels.

Our streaming radio receives our air point fine located as it is on top
of the microwave;!..
--
Tony Sayer

In article , Andy
Burns scribeth thus
housetrained wrote:

the Roku Box in the kitchen it stops working when the
microwave oven is in use.

Domestic microwaves (and many other devices) use the same 2.4Ghz
frequency as WiFi.

WiFi uses about 1/4 of a Watt, a typical microwave about 850 Watts,
there will be a a small amount of leakage from the microwave that's not
enough to worry about, but which will destroy the WiFi signal,
especially as it sounds like your Roku box is closer to the microwave
than to the computer (or WiFi access point if you have one).


You might try a change of channel for your airpoint, might just make
enough difference..
--
Tony Sayer

"tony sayer" wrote in message
...
In article , housetrained
scribeth thus
This not related to TV's but to sound. Expect some nice person on this NG
will know and share the answer. When music is streamed from the computer
to
the Roku Box in the kitchen it stops working when the microwave oven is in
use. Tried moving the Roku etc. but to no avail. S'pose I could try moving
the microwave. BUT, should this happen? Is the Microwave 40? Is it
dangerous?
TIA


If your streaming over a wi-fi thats on 2.4 Ghz then it shouldn't be too
difficult to conclude what frequency your microwave works at..

Sometimes some models leak more than others even if they are inside the
permitted or considered safe levels.

Our streaming radio receives our air point fine located as it is on top
of the microwave;!..
--
Tony Sayer

My kitchen streaming radio is not one top of the micro, but it's certainly
unaffected by the microwave being on.

Paul DS

On Wed, 16 Jun 2010 04:34:31 -0700 (PDT), Dr Hfuhruhurr
wrote:

On 16 June, 11:58, Andy Burns wrote:
housetrained wrote:
the Roku Box in the kitchen it stops working when the
microwave oven is in use.

Domestic microwaves (and many other devices) use the same 2.4Ghz
frequency as WiFi.

WiFi uses about 1/4 of a Watt, a typical microwave about 850 Watts,
there will be a a small amount of leakage from the microwave that's not
enough to worry about, but which will destroy the WiFi signal,
especially as it sounds like your Roku box is closer to the microwave
than to the computer (or WiFi access point if you have one).

So if you got enough WiFi routers together, could you cook a Chicken?

In principle, yes. However, in practice the routers might cook
themselves before the chicken was done.

--
Peter Duncanson
(in uk.tech.digital-tv)

On 16/06/2010 13:35, Peter Duncanson wrote:

So if you got enough WiFi routers together, could you cook a Chicken?

In principle, yes. However, in practice the routers might cook
themselves before the chicken was done.


Wouldn't say done, more like "chicken's slowly rotting into something
that looks like cheese" ...

--
Adrian C

"Andy Burns" wrote in message
...
housetrained wrote:

the Roku Box in the kitchen it stops working when the
microwave oven is in use.

Domestic microwaves (and many other devices) use the same 2.4Ghz frequency
as WiFi.

WiFi uses about 1/4 of a Watt, a typical microwave about 850 Watts, there
will be a a small amount of leakage from the microwave that's not enough
to worry about, but which will destroy the WiFi signal, especially as it
sounds like your Roku box is closer to the microwave than to the computer
(or WiFi access point if you have one).

From
http://www.ofcom.org.uk/static/archi...458/rtl458.pdf

"2.0 Summary
2.1 The frequency measured from the domestic microwave cookers varied
between
approximately 1.87GHz and 2.93GHz (1060MHz).
2.2 Between 2.0GHz and 2.75GHz (750MHz) the RF signal emanating from the
cooking
chamber was approximately 10dB above the noise with the major signal peaks
at between
2.4GHz and 2.5GHz (100MHz).
2.3 The RF power leaking from the all the domestic microwave cookers tested
varied between
1549mW and 245mW which is a difference of 8dB.
2.4 Leakage from the doors of domestic microwave cookers is greater from
cookers that at have
been in constant use over a number of years."

Just checking my dodgy maths - is that between 1.59W and 0.245W?
If so it is not surprising that there can be interference.
More surprising that WiFi works when the microwave is closer than the AP.
Although we don't use the microwave as much as the WiFi :-)

Cheers

Dave R


--
No plan survives contact with the enemy.

Helmuth von Moltke the Elder

Domestic microwaves (and many other devices) use the same 2.4Ghz frequency
as WiFi.

WiFi uses about 1/4 of a Watt, a typical microwave about 850 Watts, there
will be a a small amount of leakage from the microwave that's not enough
to worry about, but which will destroy the WiFi signal, especially as it
sounds like your Roku box is closer to the microwave than to the computer
(or WiFi access point if you have one).

From
http://www.ofcom.org.uk/static/archi...rchive/rtl458/
rtl458.pdf

"2.0 Summary
2.1 The frequency measured from the domestic microwave cookers varied
between
approximately 1.87GHz and 2.93GHz (1060MHz).
2.2 Between 2.0GHz and 2.75GHz (750MHz) the RF signal emanating from the
cooking
chamber was approximately 10dB above the noise with the major signal peaks
at between
2.4GHz and 2.5GHz (100MHz).
2.3 The RF power leaking from the all the domestic microwave cookers tested
varied between
1549mW and 245mW which is a difference of 8dB.
2.4 Leakage from the doors of domestic microwave cookers is greater from
cookers that at have
been in constant use over a number of years."

Just checking my dodgy maths - is that between 1.59W and 0.245W?

Yes as near as makes no difference..

If so it is not surprising that there can be interference.

Yes we have seen microwave ovens cause serious to industrial grade
microwave links using 2.4, this was a while ago now as these days the
spectrum is too polluted in built up areas.

One was out in the sticks and used a 3 foot diameter receive parabolic
aerial and a microwave oven 400 yards away and in the opposite direction
was upsetting that!. Cured it by paying for them to go get a nice new
model. Seems older ones do leak quite a bit...

More surprising that WiFi works when the microwave is closer than the AP.
Although we don't use the microwave as much as the WiFi :-)

Depends on how much its leaking..

Cheers

Dave R



--
Tony Sayer