In response to Bernard Green

[bernardgreen]

Oblique references to abnormal installations, for example under a transmitter mast, are not relevant.

Your neighbour having a 433.92 Mhz transmitter is not abnormal.

 

[JohnD]

Was it not you who told the tale about people who park their cars under BBC transmitter masts having problems with remote locking?

An entirely irrelevant tale to an ordinary domestic house in an ordinary residential street.

So if you claim it is normal for neighbours to have transmitters in their homes, how often do you estimate that a Yale alarm fails to operate because a sensor has been blocked at the same fraction of a second that a burglar breaks in? Have you ever tried it? We know someone who has, using a remote control, and failed to prevent the alarm working.

 

[dpt]

http://www.kenwood-electronics.co.uk/products/comms/amateur_radio/vhf_uhf/TM-D710E/details/

Amateur radio is very popular.

 

[Europlex]

Well, that was a totally pointless post, if a Radio Amateur causes problems with his/her transmissions, as a part of their licence they are obliged to solve/cure the problem.

 

[dpt]

Well, that was a totally pointless post, if a Radio Amateur causes problems with his/her transmissions, as a part of their licence they are obliged to solve/cure the problem.

It is not as simple as you say. A radio operator has to be aware they are causing interference in order to sort the issue out. As for mobile operation how would the operator know?

Still, are you saying that transmitters do not cause interference?

 

[Europlex]

For heavens sake, 'Hoovers, electric drills' and the like can give off RF and cause interference with different household items, ever seen your TV 'blink' when one is switched on?

 

[JohnD]

I see you have not grasped the difference between fanciful speculation and guesswork, and practical experience.

Are you willing to estimate the probability that interference, whether from hoovers, electric drills, or baby monitors, will block the alarm signal from a sensor at the exact fraction of a second that a burglar breaks into your house?

Maybe you should invest in a system and try it out. You can often find a used one on ebay.

You are obviously unwilling to let your fantasies be influenced by anybody else's experience. Burglars apart, you will get an indication of interference affecting reliability by observing how frequently, if at all, a signal is missed in ordinary daily activity, for example if opening the front door fails to start a countdown, or a chime fails to occur. There are other people with a wider experience of these simple DIY systems than me, but my own experience is a failure rate of zero in about five thousand, using three such installations, but it will be interesting to hear yours, when you have some.

 

[dpt]

From around 10 to 50 Hz I believe?

 

[dpt]

I see you have not grasped the difference between fanciful speculation and guesswork, and practical experience.

Are you willing to estimate the probability that interference, whether from hoovers, electric drills, or baby monitors, will block the alarm signal from a sensor at the exact fraction of a second that a burglar breaks into your house?

Maybe you should invest in a system and try it out. You can often find a used one on ebay.

You are obviously unwilling to let your fantasies be influenced by anybody else's experience. Burglars apart, you will get an indication of interference affecting reliability by observing how frequently, if at all, a signal is missed in ordinary daily activity, for example if opening the front door fails to start a countdown, or a chime fails to occur. There are other people with a wider experience of these simple DIY systems than me, but my own experience is a failure rate of zero in about five thousand, using three such installations, but it will be interesting to hear yours, when you have some.

A burglar could use a transmitter to overload the alarm I would suspect.

An amateur radio friend of mine sets off a few of these DIY alarms on the road he lives on.

 

[bernardgreen]

Maybe you should invest in a system and try it out. You can often find a used one on ebay.

Used and then replaced ? Why would a user want to replace it ?

 

[JohnD]

A burglar could use a transmitter to overload the alarm I would suspect.

yes, such a possibility could exist

but remember we are talking about a simple, economical thing that a DIYer can install in a couple of hours for £150 or so.

The householder wants a cheap fix to discourage the opportunist thief, or to annoy the crackhead who kicks in the door looking for easy pickings, neither householder nor intruder is likely to be using much in the way of specialised skill or equipment.

I'm all in favour of people who can afford it, and see the need, splashing out on something better. But a simple and cheap package that will make a noise, and will phone you and other keyholders in the event of an alarm, is worth having, and all some people can afford, and generally works fine, despite the unsubstantiated scare stories bandied about.

There are people on this forum who aren't happy being on a DIY website.

 

[Europlex]

Maybe you should invest in a system and try it out. You can often find a used one on ebay.

Used and then replaced ? Why would a user want to replace it ?

Usually because they found it wanting, so had a proper wired system installed.

Done that.

Don't forget the 'letterbox saga' there was a wired system fitted there soon after.

 

[dpt]

A burglar could use a transmitter to overload the alarm I would suspect.

yes, such a possibility could exist

but remember we are talking about a simple, economical thing that a DIYer can install in a couple of hours for £150 or so.

The householder wants a cheap fix to discourage the opportunist thief, or to annoy the crackhead who kicks in the door looking for easy pickings, neither householder nor intruder is likely to be using much in the way of specialised skill or equipment.

I'm all in favour of people who can afford it, and see the need, splashing out on something better. But a simple and cheap package that will make a noise, and will phone you and other keyholders in the event of an alarm, is worth having, and all some people can afford, and generally works fine, despite the unsubstantiated scare stories bandied about.

There are people on this forum who aren't happy being on a DIY website.

You can pick up a AM CB for next to nothing, they interfere with these cheap wireless alarms, common knowledge around Leeds.

 

[bernardgreen]

Don't forget the 'letterbox saga' there was a wired system fitted there soon after.

Wasn't that the thread where mdf ( AKA YakeGuy ) said

I disabled the system without entering the property (will not disclose method) .

and

Strangely the homeowners never contacted me on return perhaps fearing I would be stinging them with a perfectly reasonable call out charge.

Perhaps they sold it on E-bay.

Read more: //www.diynot.com/forums/viewtopic.php?p=2003845#2003845#ixzz2SLqKGXky

 

[RF Lighting]

A burglar could use a transmitter to overload the alarm I would suspect.

yes, such a possibility could exist

but remember we are talking about a simple, economical thing that a DIYer can install in a couple of hours for £150 or so.

The householder wants a cheap fix to discourage the opportunist thief, or to annoy the crackhead who kicks in the door looking for easy pickings, neither householder nor intruder is likely to be using much in the way of specialised skill or equipment.

I'm all in favour of people who can afford it, and see the need, splashing out on something better. But a simple and cheap package that will make a noise, and will phone you and other keyholders in the event of an alarm, is worth having, and all some people can afford, and generally works fine, despite the unsubstantiated scare stories bandied about.

There are people on this forum who aren't happy being on a DIY website.

You can pick up a AM CB for next to nothing, they interfere with these cheap wireless alarms, common knowledge around Leeds.

I've never heard of a single case of this either in Leeds or anywhere else for that matter.