ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Shout Box
Recent Posts
MRI LED lights dimmer control replacement - wow!
by HotLine1. 01/19/18 06:19 PM
Video: Inventor of the GFCI self-testing shocks
by Bill Addiss. 01/17/18 11:11 PM
FPE in Germany
by HotLine1. 01/17/18 07:07 PM
VDE 0100 to introduce AFCIs
by LongRunner. 01/17/18 10:32 AM
Fujifilm Recalls Power Adapter Wall Plugs
by Admin. 01/16/18 07:04 PM
New in the Gallery:
Housebilding DIY wiring
SE cable question
Who's Online Now
1 registered members (HotLine1), 15 guests, and 11 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Military Jams Garage Door Openers #47663
01/22/05 11:45 AM
01/22/05 11:45 AM
A
Active 1  Offline OP
Member
Joined: Feb 2003
Posts: 687
Grayslake IL, USA
The US military with Motorola are upgrading their comunication systems to the same frequencys as garage door openers between now and 2008. It may affect you if your near a base. Some say the range is 7 miles while others say 50 miles.
http://www.cbsnews.com/stories/2004/12/06/tech/main659343.shtml
http://wireless.engadget.com/entry/1234000167022830/

Work Gear for Electricians and the Trades
Re: Military Jams Garage Door Openers #47664
01/22/05 07:12 PM
01/22/05 07:12 PM
Trumpy  Offline

Member
Joined: Jul 2002
Posts: 8,231
SI,New Zealand
That's an interesting one Tom.
Surely there would be some sort of a narrow-band notch filter that could be fitted to the Opener Reciever units, to prevent this sort of thing happening.
Oddly enough, we had the same problem here with our Fire station Pager transmitter when it was first installed, it used to open all the garage doors on the block.
We had a local technician make up a heap of filters for the units and that seemed to cure things. [Linked Image]
What a lot of people don't understand, is the fact that it isn't the transmitting equipment that is faulty, it's the in-ability of the reciever circuitry to filter out the unwanted signal.
This happens a lot when appliances are built to a (usually as low as possible) price. [Linked Image]

Re: Military Jams Garage Door Openers #47665
01/24/05 09:56 AM
01/24/05 09:56 AM
R
rowdyrudy  Offline
Member
Joined: Nov 2002
Posts: 169
Mascoutah, IL USA
A while back, in AZ, F-15 ground proximity radar was energizing the perimeter alarm system at a state prison. Corrected by changing frequency of alarms. BTW, the GPR frequency was secret!
Rowdy

Re: Military Jams Garage Door Openers #47666
01/24/05 12:01 PM
01/24/05 12:01 PM
H
hbiss  Offline
Member
Joined: Dec 2003
Posts: 886
Hawthorne, NY USA
Surely there would be some sort of a narrow-band notch filter that could be fitted to the Opener Reciever units, to prevent this sort of thing happening.

Apparently the military is using the same frequency as the door openers so no amount of filtering is going to help. Only thing to do is change the frequency of the transmitter and receiver for the opener. This is not an easy thing and they will probably have to be replaced and I don't even think there is anything available.

-Hal


Featured:

2017 Master Electrician Exam Preparation Combos
2017 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
Posts: 165
Joined: March 2007
Show All Member Profiles 
Top Posters(30 Days)
Admin 20
sparky 15
Potseal 14
Popular Topics(Views)
243,554 Are you busy
180,360 Re: Forum
170,838 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Release build 20180101)
Page Time: 0.014s Queries: 14 (0.003s) Memory: 0.9591 MB (Peak: 1.0897 MB) Zlib enabled. Server Time: 2018-01-20 00:48:25 UTC