Antenna for cordless phone
in [Design]
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From: Joerg on 25 May 2010 10:27 D Yuniskis wrote: > Hi Joerg, > > Joerg wrote: >> John wrote: >>> Just try the vertical whip installed as elevated as possible outside >>> the house and with the main unit as close as possible to the antenna >> >> Cordless phones aren't strictly vertical anymore, most don't even have >> as much as a stub for an antenna. Just traces on the board or some >> wire. When I took apart our previous ones after they were failing I >> was amazed, they had two antennas diplexed in the handsets. > > The "handsets" have a short whip -- about 6" long (non retractable). > Actually, there are two choices for the antenna -- I can't recall > which ones I have installed currently (probably the longer of the > two sizes). > > The "base" has a similar size (maybe 8"?) though packaged more > like the antennae you find on a wireless router (i.e., encased > in plastic or somesuch) > That sounds like it's either industrial use phones or stuff from the early 90's. If the latter make sure you can still get replacement batteries. >> I think Don doesn't want an antenna on the roof so a yagi or something > > Yes, I would not like to end up with an antenna on the roof. > Though, I might be able to locate it *in* the "ceiling". > Or, in the chimney for the fireplace (as I plan on removing the > fireplace -- silly thing to have in this part of the country! :> ) > > Again, a lot of this "exercise" is a practice run for me to > sort out the issues that will affect doing the same thing with > WiFi access point :-/ (the adage "make one to throw away" :> ) > >> else directional may be his only option in order to get another >> 5-10dB. But I believe that the base will lose its FCC registration if >> you do that. > > I figure if I just take the entire base unit up to the roof, > there's nothing "questionable" about that! I.e., just like having > another "story" on the house. From there, I can see how *good* > the signal would be (with no cable losses, etc.). If that > isn't going to cut it, I may just wait for the access point and > use a WiFi phone (assuming I can get better coverage with WiFi) Moving the base "as is" to another location would be legit I assume. Best to find a location that has the least in RF barriers around it. RF barriers would be armored concrete, wood frame walls aluminum-backed fiber insulation in there, any flashing in the area, gutters, downspouts, earthquake straps and so on. A tree that carries a lot of moisture in its canopy is also not so good. But talk to SWMBO before using the chain saw :-) -- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM.
From: D Yuniskis on 25 May 2010 11:55 Hi Joerg, Joerg wrote: >>> Cordless phones aren't strictly vertical anymore, most don't even >>> have as much as a stub for an antenna. Just traces on the board or >>> some wire. When I took apart our previous ones after they were >>> failing I was amazed, they had two antennas diplexed in the handsets. >> >> The "handsets" have a short whip -- about 6" long (non retractable). >> Actually, there are two choices for the antenna -- I can't recall >> which ones I have installed currently (probably the longer of the >> two sizes). >> >> The "base" has a similar size (maybe 8"?) though packaged more >> like the antennae you find on a wireless router (i.e., encased >> in plastic or somesuch) > > That sounds like it's either industrial use phones or stuff from the I think it was originally designed for industrial use. E.g., they advertise being able to use it *inside* an 11 story building (i.e. *through* 10 floors) > early 90's. If the latter make sure you can still get replacement > batteries. I imagine I can have some made for it if push came to shove. Or, buy another/newer unit (or, switch to a WiFi phone). Regardless, the antenna issues will remain. >>> I think Don doesn't want an antenna on the roof so a yagi or something >> >> Yes, I would not like to end up with an antenna on the roof. >> Though, I might be able to locate it *in* the "ceiling". >> Or, in the chimney for the fireplace (as I plan on removing the >> fireplace -- silly thing to have in this part of the country! :> ) >> >> Again, a lot of this "exercise" is a practice run for me to >> sort out the issues that will affect doing the same thing with >> WiFi access point :-/ (the adage "make one to throw away" :> ) >> >>> else directional may be his only option in order to get another >>> 5-10dB. But I believe that the base will lose its FCC registration if >>> you do that. >> >> I figure if I just take the entire base unit up to the roof, >> there's nothing "questionable" about that! I.e., just like having >> another "story" on the house. From there, I can see how *good* >> the signal would be (with no cable losses, etc.). If that >> isn't going to cut it, I may just wait for the access point and >> use a WiFi phone (assuming I can get better coverage with WiFi) > > Moving the base "as is" to another location would be legit I assume. I can't see how anyone could complain! Who's to say it can only be used in a 2 story residence? 3 story? 10 story office complex? etc. How is that any different than me putting it on the roof?? > Best to find a location that has the least in RF barriers around it. RF > barriers would be armored concrete, wood frame walls aluminum-backed > fiber insulation in there, any flashing in the area, gutters, I think *in* the ceiling is best compromise. I.e., the drywall doesn't extend up into that area so no worry about foil backing. No wiring up there, etc. > downspouts, earthquake straps and so on. A tree that carries a lot of No gutters or downspouts -- rainfall is usually too heavy for these and just rips them off people's houses. Unfortunate as it would make water harvesting a lot easier (instead, I have to install french drain and pump) "Earthquake straps"?? > moisture in its canopy is also not so good. But talk to SWMBO before > using the chain saw :-) Of course, I can't control what the *neighbors* have in their yards (and, by definition, that includes *all* my neighbors since the goal is to be able to walk the entire neighborhood!) Maybe pray for a good storm season this Summer? :>
From: Joerg on 25 May 2010 20:38 D Yuniskis wrote: > Hi Joerg, > > Joerg wrote: [...] >> downspouts, earthquake straps and so on. A tree that carries a lot of > > No gutters or downspouts -- rainfall is usually too heavy for > these and just rips them off people's houses. Unfortunate as it > would make water harvesting a lot easier (instead, I have to install > french drain and pump) > > "Earthquake straps"?? > Ok, that's a thing for us Californians. At least if you don't want to end up with a big old crack in the house. >> moisture in its canopy is also not so good. But talk to SWMBO before >> using the chain saw :-) > > Of course, I can't control what the *neighbors* have in their > yards (and, by definition, that includes *all* my neighbors > since the goal is to be able to walk the entire neighborhood!) > Or get a cell phone ... :-) > Maybe pray for a good storm season this Summer? :> But then you'd need the luck D.J.Delorie had. A tornado turned direction probably milliseconds before reaching his house. http://www.delorie.com/photos/20080820-treedamage/1121081141.html -- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM.
From: JosephKK on 26 May 2010 04:00
On Mon, 24 May 2010 19:02:00 -0700, D Yuniskis <not.going.to.be(a)seen.com> wrote: >Hi Joerg, > >Joerg wrote: >> John wrote: >>> Just try the vertical whip installed as elevated as possible outside >>> the house and with the main unit as close as possible to the antenna >> >> Cordless phones aren't strictly vertical anymore, most don't even have >> as much as a stub for an antenna. Just traces on the board or some wire. >> When I took apart our previous ones after they were failing I was >> amazed, they had two antennas diplexed in the handsets. > >The "handsets" have a short whip -- about 6" long (non retractable). >Actually, there are two choices for the antenna -- I can't recall >which ones I have installed currently (probably the longer of the >two sizes). > >The "base" has a similar size (maybe 8"?) though packaged more >like the antennae you find on a wireless router (i.e., encased >in plastic or somesuch) > >> I think Don doesn't want an antenna on the roof so a yagi or something > >Yes, I would not like to end up with an antenna on the roof. >Though, I might be able to locate it *in* the "ceiling". >Or, in the chimney for the fireplace (as I plan on removing the >fireplace -- silly thing to have in this part of the country! :> ) > >Again, a lot of this "exercise" is a practice run for me to >sort out the issues that will affect doing the same thing with >WiFi access point :-/ (the adage "make one to throw away" :> ) > >> else directional may be his only option in order to get another 5-10dB. >> But I believe that the base will lose its FCC registration if you do that. > >I figure if I just take the entire base unit up to the roof, >there's nothing "questionable" about that! I.e., just like having >another "story" on the house. From there, I can see how *good* >the signal would be (with no cable losses, etc.). If that >isn't going to cut it, I may just wait for the access point and >use a WiFi phone (assuming I can get better coverage with WiFi) If you are interested enough to do some of the heavy lifting; check out http://www.nec2.org/ for antenna analysis code and theory. Lots of free stuff available, but it is not polished. It shouldn't be hard to get a cardiod horizontal pattern and a rather flat vertical "torus". I am digging into it myself. |