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'[ot]: microwave-inclined storm-spotter ??'
2001\08\04@185901 by rad0

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Are you describing one of those aircraft storm scopes, I think 3m makes
one??

I am asking because, I would like to know if a microwave detector could be
home build??

I'd like to be able to build something to leak check microwave ovens, and
to check for these through the wall video systems, mostly to track down
sources of  TV interference....

thanks

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2001\08\04@192623 by David VanHorn

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At 05:57 PM 8/4/01 -0500, rad0 wrote:
>Are you describing one of those aircraft storm scopes, I think 3m makes
>one??

I'm sure they do. And it probably costs more than my car.

>I am asking because, I would like to know if a microwave detector could be
>home build??
>
>I'd like to be able to build something to leak check microwave ovens, and
>to check for these through the wall video systems, mostly to track down
>sources of  TV interference....

These are somewhat different jobs.
The first is a simple diode detector, the second requires some frequency
selection.

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2001\08\04@193440 by rad0

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3M WX-8 Stormscope Recon.
Reg........ $ 2,589 ... Special!........ $ 2,289
Click Here to Order


they're not that much.

what's a diode detector?
how do you add frequency selection?


{Original Message removed}

2001\08\04@194520 by David VanHorn

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At 06:34 PM 8/4/01 -0500, rad0 wrote:
>3M WX-8 Stormscope Recon.
>Reg........ $ 2,589 ... Special!........ $ 2,289
>Click Here to Order
>
>
>they're not that much.

Less than I thought, but more than I want to put into that.


>what's a diode detector?
>how do you add frequency selection?

Grab an ARRL microwave handbook.

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2001\08\04@195146 by rad0

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>
> Grab an ARRL microwave handbook.
>
what's this?  what will it provide?


after searching around, I've found some 8.95 home
microwave oven testors, can you use a pic to determine
frequency?

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2001\08\04@201520 by David VanHorn

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At 06:51 PM 8/4/01 -0500, rad0 wrote:
> >
> > Grab an ARRL microwave handbook.
> >
>what's this?  what will it provide?

It answers those types of questions.


>after searching around, I've found some 8.95 home
>microwave oven testors, can you use a pic to determine
>frequency?

Not directly, but you could drive a stepper motor and control a moveable
waveguide short, and that would let you determine frequency.

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2001\08\04@231443 by Terry

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Of course, the 3M Stormscope is a passive detector, plotting received
electrical intensity on several azmith rings, and is not an aircraft radar
per se. Fun to watch though as a storm approaches and passes overhead.
{Original Message removed}

2001\08\05@044922 by Nigel Goodwin

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In message <001701c11d38$d6a66e10$4968fea9@VAIO>, rad0
<rden25spamspam_OUTMINDSPRING.COM> writes
>I am asking because, I would like to know if a microwave detector could be
>home build??

There was a project in a UK magazine for building a microwave oven
leakage detector many years ago.

>I'd like to be able to build something to leak check microwave ovens, and
>to check for these through the wall video systems, mostly to track down
>sources of  TV interference....

Unless you have some way to accurately align it, it's not really going
to be much use. I've been repairing microwave ovens for many years, in
the UK we are legally required to have a professional leakage detector,
and to have it re-calibrated yearly. We are also inspected yearly by
various of the oven manufacturers who we are service agents for, they
come and take a record of the calibration certificate number.

As for testing microwaves for leakage, it's generally a waste of time
(although we have to test every one we repair!) - I've only ever seen
two which leaked, and they were both well within the permitted UK limits
of 5mW (but outside the USA limits of 0.5mW). Both of the leaking models
were identical Philips ones, they had a door which opened downwards,
with a catch only at one corner - so the opposite top corner tended to
spring open slightly producing a small amount of leakage.

I've had the same microwave at home for 20 years, and despite been able
to take the equipment home, I've never bothered testing it, nor have I
any intention of doing so. It's nothing to get paranoid about, a decent
microwave won't leak unless it's damaged in some way.
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2001\08\06@150130 by Peter L. Peres

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> I've had the same microwave at home for 20 years, and despite been able
> to take the equipment home, I've never bothered testing it, nor have I
> any intention of doing so. It's nothing to get paranoid about, a decent
> microwave won't leak unless it's damaged in some way.

However, the second you feel suspect 'hot skin' anywhere correlated to the
working oven while near it do check. I've heard of an oven that had the
shield grille behind the glass torn out completely and was operated like
this for some 3 years (with kids in the house). They used to move away
from in front of the oven since 'it was getting hot'. Humm. They were
lucky they did not start a fire with some nail in a wooden table or a
curtain string of just the right length.

Peter

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2001\08\06@162504 by Mike Kendall

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Peter,
   That one would not require a meter to verify it as being unsafe.  The
"shield" you mentioned has a hole every 1/2 wavelength at the FCC frequency
of 2450mhz.  I also have seen microwave abuse.  I saw a group of people that
bybassed the interlock on a microwave once and would open it up to see if it
the food was hot and the oven would still be running.  I did them a favor
and "made it dissapear" as they would not listen to me.  When you feel the
warmth (usually in your eyes or testes) the microwave damage has been
seriously done already and it is too late.  I used to take cockroaches and
put them in the microwave oven many, many years ago as a "ironman" cockroach
competition.  Some would last in excess of 1/2 hour on high.  How did they
do this?  Whenever they went from the edge of the microwave towards the
center, they would turn back around.  Eventually they would all go towards
the center and get cooked within seconds.  Apparantly, the magnetron is able
to concentrate the vast majority of the energy towards the center of the
cooking area.
Mike

{Original Message removed}

2001\08\07@024418 by Roman Black

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Peter L. Peres wrote:
>
> > I've had the same microwave at home for 20 years, and despite been able
> > to take the equipment home, I've never bothered testing it, nor have I
> > any intention of doing so. It's nothing to get paranoid about, a decent
> > microwave won't leak unless it's damaged in some way.
>
> However, the second you feel suspect 'hot skin' anywhere correlated to the
> working oven while near it do check. I've heard of an oven that had the
> shield grille behind the glass torn out completely and was operated like
> this for some 3 years (with kids in the house). They used to move away
> from in front of the oven since 'it was getting hot'. Humm. They were
> lucky they did not start a fire with some nail in a wooden table or a
> curtain string of just the right length.


That is one of the scariest stories i've heard!!
We won't approve any microwave oven that has the
tinyest crack or tear in the window mesh, even
if the leak detector says it's ok. Reason being
that it might leave the shop ok, but become worse
later. :o)
-Roman

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