## Re: [mh] remote mailbox monitoring

 Re: [mh] remote mailbox monitoring From: Dan Bemowski - 2014-01-28 19:19:35 ```The metal of the box is going to act more as a ground plane than an antenna. If you are going to put an antenna on it you will want to get it pointing away from the metal box. To get the best transmission, the length of the wire matters. If the wire is the wrong length you could completely hinder your signal. The length of the wire is calculated from the frequency/wavelength that you are trying to transmit. Antennas work best at 1/4, 1/2, 5/8 and full wavelengths. The formula is Amount/Frequency in MHz. For full wavelength use 984.25 (most just use 984) for an amount if you are calculating in feet or 300 if you are calculating in meters. From that you can figure out the 5/8, 1/2 and 1/4 lengths. Typically the formulas just divide out the 984 feet or 300 meters: Wavelength : Amount Feet inches Meters ------------------------------------- Full : 984 11,811 300 5/8 : 615 7382 187.5 Half : 468 5906 150 Quarter : 234 2953 75 So dividing the wavelength amount for the type of antenna you want by your frequency will give you your antenna length needed. Here is an example using X10 RF equipment making a quarter wavelength antenna: US based 2953 / 310MHz = 9.53 inches European 75 / 433MHz = .173 meters = 17.3 centimeters Having the correct antenna length is going to give you your best transmission distance. Dan Bemowski On Tue, 2014-01-28 at 09:37 -0800, biggus wrote: > thanks. I believe that that the whole fromnt end is opened whenthe > mail arrives, but the opening faces in the wrong direction. I'd have > to put the sending antenna right at the edge. Unless I could use the > entire box as an antenna... It is metal, after all. Wonder what the > max signal distance of the door/window sensors is. > > > > > > ______________________________________________________________________ > From: krkeegan [via MisterHouse] <[hidden email]> > To: biggus <[hidden email]> > Sent: Monday, January 27, 2014 6:23 PM > Subject: Re: remote mailbox monitoring > > > This sounds like a difficult task. The distance alone seems > problematic. > > > I agree the metal container is going to be a challenge. I dropped a 2 > inch wire "antenna" out of the bottom of my metal mailbox. I am not > an antenna expert, but it seemed to help. My mailbox is only 20 feet > away though. > > > Your only hope might be that a device would be able to transmit when > the mailbox is opened. In my experience the entire front of the wall > panel is opened when mail is delivered to those large building > mailboxes. Hopefully, this would provide enough time to send out a > message. > > > > ------------------------------------------------------------------------------ > CenturyLink Cloud: The Leader in Enterprise Cloud Services. > Learn Why More Businesses Are Choosing CenturyLink Cloud For > Critical Workloads, Development Environments & Everything In Between. > Get a Quote or Start a Free Trial Today. > http://pubads.g.doubleclick.net/gampad/clk?id=119420431&iu=/4140/ostg.clktrk > ________________________________________________________ > To unsubscribe from this list, go to: > https://lists.sourceforge.net/lists/listinfo/misterhouse-users > > > > > ______________________________________________________________________ > If you reply to this email, your message will be added to the > discussion below: > http://misterhouse.10964.n7.nabble.com/remote-mailbox-monitoring-tp19434p19435.html > To unsubscribe from remote mailbox monitoring, click here. > NAML > > > > > > ______________________________________________________________________ > View this message in context: Re: remote mailbox monitoring > Sent from the Misterhouse - User mailing list archive at Nabble.com. > ------------------------------------------------------------------------------ > WatchGuard Dimension instantly turns raw network data into actionable > security intelligence. It gives you real-time visual feedback on key > security issues and trends. Skip the complicated setup - simply import > a virtual appliance and go from zero to informed in seconds. > http://pubads.g.doubleclick.net/gampad/clk?id=123612991&iu=/4140/ostg.clktrk > ________________________________________________________ > To unsubscribe from this list, go to: https://lists.sourceforge.net/lists/listinfo/misterhouse-users > ```

 [mh] remote mailbox monitoring From: biggus - 2014-01-27 22:43:10 ```Hi list, I've been away for a while, but my box of X10 bits is itching to get deployed in my new place. One thing I was wondering if anyone encountered and came up with a solution for is a remote mailbox monitor. The condo complex where I live has the mailboxes about a block's walk from my front door and the casing is all metal. Since my mailbox will only get opened when I get mail, a door/window unit will work. The mail sometimes comes when it's dark, so a motion detector wouldn't be reliable. What I'm struggling with is how to send the signal that far from inside a metal box. Has anyone had this situation and solved it? I doubt that they'd like it if I were to drill a hole in the back to pass a wire or a cable attached to a trigger mechanism. Thanks! Biggus -- View this message in context: http://misterhouse.10964.n7.nabble.com/remote-mailbox-monitoring-tp19434.html Sent from the Misterhouse - User mailing list archive at Nabble.com. ```
 Re: [mh] remote mailbox monitoring From: Kevin Robert Keegan - 2014-01-27 23:21:52 Attachments: Message as HTML ```This sounds like a difficult task. The distance alone seems problematic. I agree the metal container is going to be a challenge. I dropped a 2 inch wire "antenna" out of the bottom of my metal mailbox. I am not an antenna expert, but it seemed to help. My mailbox is only 20 feet away though. Your only hope might be that a device would be able to transmit when the mailbox is opened. In my experience the entire front of the wall panel is opened when mail is delivered to those large building mailboxes. Hopefully, this would provide enough time to send out a message. ```
 Re: [mh] remote mailbox monitoring From: biggus - 2014-01-28 17:37:47 Attachments: Message as HTML ```thanks. I believe that that the whole fromnt end is opened whenthe mail arrives, but the opening faces in the wrong direction. I'd have to put the sending antenna right at the edge.  Unless I could use the entire box as an antenna...  It is metal, after all.  Wonder what the max signal distance of the door/window sensors is. ________________________________ From: krkeegan [via MisterHouse] To: biggus Sent: Monday, January 27, 2014 6:23 PM Subject: Re: remote mailbox monitoring This sounds like a difficult task.  The distance alone seems problematic. I agree the metal container is going to be a challenge. I dropped a 2 inch wire "antenna" out of the bottom of my metal mailbox.  I am not an antenna expert, but it seemed to help.  My mailbox is only 20 feet away though. Your only hope might be that a device would be able to transmit when the mailbox is opened.  In my experience the entire front of the wall panel is opened when mail is delivered to those large building mailboxes.  Hopefully, this would provide enough time to send out a message. ------------------------------------------------------------------------------ CenturyLink Cloud: The Leader in Enterprise Cloud Services. Learn Why More Businesses Are Choosing CenturyLink Cloud For Critical Workloads, Development Environments & Everything In Between. Get a Quote or Start a Free Trial Today. http://pubads.g.doubleclick.net/gampad/clk?id=119420431&iu=/4140/ostg.clktrk ________________________________________________________ To unsubscribe from this list, go to: https://lists.sourceforge.net/lists/listinfo/misterhouse-users ________________________________ If you reply to this email, your message will be added to the discussion below:http://misterhouse.10964.n7.nabble.com/remote-mailbox-monitoring-tp19434p19435.html To unsubscribe from remote mailbox monitoring, click here. NAML -- View this message in context: http://misterhouse.10964.n7.nabble.com/remote-mailbox-monitoring-tp19434p19440.html Sent from the Misterhouse - User mailing list archive at Nabble.com.```
 Re: [mh] remote mailbox monitoring From: Dan Bemowski - 2014-01-28 19:19:35 ```The metal of the box is going to act more as a ground plane than an antenna. If you are going to put an antenna on it you will want to get it pointing away from the metal box. To get the best transmission, the length of the wire matters. If the wire is the wrong length you could completely hinder your signal. The length of the wire is calculated from the frequency/wavelength that you are trying to transmit. Antennas work best at 1/4, 1/2, 5/8 and full wavelengths. The formula is Amount/Frequency in MHz. For full wavelength use 984.25 (most just use 984) for an amount if you are calculating in feet or 300 if you are calculating in meters. From that you can figure out the 5/8, 1/2 and 1/4 lengths. Typically the formulas just divide out the 984 feet or 300 meters: Wavelength : Amount Feet inches Meters ------------------------------------- Full : 984 11,811 300 5/8 : 615 7382 187.5 Half : 468 5906 150 Quarter : 234 2953 75 So dividing the wavelength amount for the type of antenna you want by your frequency will give you your antenna length needed. Here is an example using X10 RF equipment making a quarter wavelength antenna: US based 2953 / 310MHz = 9.53 inches European 75 / 433MHz = .173 meters = 17.3 centimeters Having the correct antenna length is going to give you your best transmission distance. Dan Bemowski On Tue, 2014-01-28 at 09:37 -0800, biggus wrote: > thanks. I believe that that the whole fromnt end is opened whenthe > mail arrives, but the opening faces in the wrong direction. I'd have > to put the sending antenna right at the edge. Unless I could use the > entire box as an antenna... It is metal, after all. Wonder what the > max signal distance of the door/window sensors is. > > > > > > ______________________________________________________________________ > From: krkeegan [via MisterHouse] <[hidden email]> > To: biggus <[hidden email]> > Sent: Monday, January 27, 2014 6:23 PM > Subject: Re: remote mailbox monitoring > > > This sounds like a difficult task. The distance alone seems > problematic. > > > I agree the metal container is going to be a challenge. I dropped a 2 > inch wire "antenna" out of the bottom of my metal mailbox. I am not > an antenna expert, but it seemed to help. My mailbox is only 20 feet > away though. > > > Your only hope might be that a device would be able to transmit when > the mailbox is opened. In my experience the entire front of the wall > panel is opened when mail is delivered to those large building > mailboxes. Hopefully, this would provide enough time to send out a > message. > > > > ------------------------------------------------------------------------------ > CenturyLink Cloud: The Leader in Enterprise Cloud Services. > Learn Why More Businesses Are Choosing CenturyLink Cloud For > Critical Workloads, Development Environments & Everything In Between. > Get a Quote or Start a Free Trial Today. > http://pubads.g.doubleclick.net/gampad/clk?id=119420431&iu=/4140/ostg.clktrk > ________________________________________________________ > To unsubscribe from this list, go to: > https://lists.sourceforge.net/lists/listinfo/misterhouse-users > > > > > ______________________________________________________________________ > If you reply to this email, your message will be added to the > discussion below: > http://misterhouse.10964.n7.nabble.com/remote-mailbox-monitoring-tp19434p19435.html > To unsubscribe from remote mailbox monitoring, click here. > NAML > > > > > > ______________________________________________________________________ > View this message in context: Re: remote mailbox monitoring > Sent from the Misterhouse - User mailing list archive at Nabble.com. > ------------------------------------------------------------------------------ > WatchGuard Dimension instantly turns raw network data into actionable > security intelligence. It gives you real-time visual feedback on key > security issues and trends. Skip the complicated setup - simply import > a virtual appliance and go from zero to informed in seconds. > http://pubads.g.doubleclick.net/gampad/clk?id=123612991&iu=/4140/ostg.clktrk > ________________________________________________________ > To unsubscribe from this list, go to: https://lists.sourceforge.net/lists/listinfo/misterhouse-users > ```