Antenna for cordless phone
in [Design]
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From: D Yuniskis on 24 May 2010 22:19 Hi Joe, Joe wrote: > On Tue, 18 May 2010 16:09:28 -0700, D Yuniskis wrote: >> Joerg wrote: > .... >>>> The antenna that I was *questioning* will (physically) mate to a >>>> Linksys wireless router (though not intended to do so, "just >>>> coincidence" -- sorry, I don't deal with RF stuff [...] >>> Cordless phone on a Linksys router? >>> >>> <scratching head> >> No, I was trying to describe the type of connector on the antenna that I >> am "questioning" -- without KNOWING the proper names for the various RF >> plumbing! :> >> >> I figured most folks have seen a linksys router (with removable >> antennae) so could relate to that example. >> >> The phone's base unit is something like a "reverse TNC" (??) so I can't >> mate the antenna to the base unit "as is". > > RP-SMA is common on wireless routers. A few use standard SMA > instead of the reverse-polarity version. Connector thread = 1/4"-36. > See the SMA section of <http://www.wa1mba.org/rfconn.htm> and the > "Matable Connectors" table at the end of that page. These connectors (on the wireless router) are much larger diameter than that. More like a BNC but with a knurled (screw on) outer connector instead of the bayonet style. > <http://en.wikipedia.org/wiki/SMA_connector> says, "RP-SMA connectors > are widely used by Wi-Fi equipment manufacturers to comply with > [FCC regulations] which are designed to make it difficult for > consumers to connect antennas with gain and thereby breach compliance." Hmmm... I've seen "antenna with gain" *sold* for WiFi applications. Gray market? I know my current AP explicitly allows other antenna to be used (Cisco AP1231G) -- I've just been using a pair that I pulled off a linksys WRT54G (so much for "making it difficult for consumers to connect antennas..."! :-/ ) > <http://www.sparkfun.com/commerce/product_info.php?products_id=592> > lists an SMA to RP-SMA adapter and a multiband antenna, which in > turn links to various-band antennae with SMA or RP-SMA connectors. I think the AP is some sort of TNC. The antenna connector on the phone's base unit is similar but not identical. E.g., I remove the antenna from the base by unscrewing "backwards" (left-handed threads?) whereas the AP unscrews "normally". I think the guts of the connector are also different sexes (i.e., the center conductor) -- though the outer shells (threaded portions) are identical (in size and pitch). I looked through the manual *briefly* and couldn't find a reference to the connector type (antenna gain is 5dBi) though I am *sure* it was "reverse TNC" (that's not the sort of detail I come across in my normal routine so it seems unlikely that I just "made it up")
From: D Yuniskis on 24 May 2010 22:22 Hi Joel, Joel Koltner wrote: > <krw(a)att.bizzzzzzzzzzzz> wrote in message > news:o3g6v55tm7o42c00bacs1puhb4qrb4dn35(a)4ax.com... >> RP-TNC. In theory they're hard to find, but reality is a little >> different. > > Until the Internet, Google, and eBay became ubiquitous something around > a decade ago now, I think the FCC's approach there ("use hard-to-find > connectors") worked -- but it certainly won't ever again. :-) That seems like a pretty lame approach! Like using clutch head screws to discourage people from disassembling bits of kit. Sheesh! It's a mechanical item. No "secrets" involved. How long do they think that "protection by obscurity" will last?? :<
From: D Yuniskis on 24 May 2010 22:26 Hi Joerg, Joerg wrote: > It's easier than you think, one doesn't have to be a search engine > genius. Ok, I am pretty good at finding stuff but this took less than > one minute: > > http://www.amazon.com/Booster-Antenna-Linksys-WMP54GS-WRT54GC/dp/B000SEN9U6 > http://www.amazon.com/eForcity-Booster-Antenna-Linksys-2400-2483/dp/B000FEDRN8 > http://www.hdcom.com/links.html That connector looks too small. This looks more like it (for the AP; the antenna fro the phone base has a *male* center conductor): http://www.amazon.com/Alfa-802-11g-OMNI-Directional-High-Gain-Adapters/dp/B002TWEKD0/ref=sr_1_3?ie=UTF8&s=electronics&qid=1274753834&sr=1-3
From: John on 25 May 2010 08:16 On Mon, 24 May 2010 17:41:12 -0700, D Yuniskis <not.going.to.be(a)seen.com> wrote: >Hi John, > >John wrote: >> On Sun, 23 May 2010 17:42:30 -0700 (PDT), mpm <mpmillard(a)aol.com> >> wrote: >> >>> On May 18, 6:09 pm, D Yuniskis <not.going.to...(a)seen.com> wrote: >>>> Hi Joerg, >>>> >>>>>> I'll drag out a GPS and get some actual measurements, >>>>>> if necessary. I've not done an exhaustive survey >>>>>> of where things work/don't work. Though I have found >>>>>> the upper left corner to be a problem area as I am >>>>>> often passing through there when I lose signal. >>>>>> The antenna that I was *questioning* will (physically) >>>>>> mate to a Linksys wireless router (though not intended >>>>>> to do so, "just coincidence" -- sorry, I don't deal with >>>>>> RF stuff so i can't tell you what sort of connectors >>>>>> they are -- I don't think they will mate with the >>>>>> base unit on the phone :<) >>>>> Cordless phone on a Linksys router? >>>>> <scratching head> >>>> No, I was trying to describe the type of connector on the >>>> antenna that I am "questioning" -- without KNOWING the >>>> proper names for the various RF plumbing! :> >>>> >>>> I figured most folks have seen a linksys router (with >>>> removable antennae) so could relate to that example. >>>> >>>> The phone's base unit is something like a "reverse TNC" >>>> (??) so I can't mate the antenna to the base unit >>>> "as is".- Hide quoted text - >>>> >>>> - Show quoted text - >>> If you give us the FCC ID number off the device, it can be easily >>> looked up on the FCC's "Equipment Authorization Search" web page: >>> Link: http://www.fcc.gov/oet/ea/fccid/ >>> >>> That is why I asked you for the number (May 17th). >>> If the device is new enough to have been recently certified (i.e, >>> within the last decade), there's a reasonably good chance that both >>> its photographs and its parts lists (BOM) are available online at the >>> FCC. >>> At which point, you will not have to describe the antenna to us, and >>> in fact, you may find your answer directly. >>> >>> It is worth a shot, in my opinion. >>> >>> You may have to do an advanced search, if you can't find the FCC ID >>> nameplate, but US law requires it to be permanently attached to the >>> device. >>> Sometimes this is a decal; other times it may be thermoformed into the >>> plastic housing itself (and often difficult to read), but you should >>> be able to locate it. >>> If you still have the User's Manual, look at the Specification Page >>> and the FCC ID can usually be found there as well. >>> >>> -mpm >> >> He probably gave up. >> It became a bit more complex that he was prepared to tackle. > >Sorry, no, I had said I would drag the base up to the roof and >walk the area to try to record where *exactly* the dropouts >were with the base ON THE ROOF. Then, repeat the exercise >with it back inside on the counter. I figured any other >chat on the subject would just be speculative without >hard facts. > >But, I've been busy getting ready for a 1,200 mile road trip >(new tires, today... I'll change the oil tomorrow, etc.) and >trying to get other "obligations" off my calendar. Cordless >phone just didn't rise to the level of urgency to bump some >of these other things :> > >I'll try to print out a couple drawings of the neighborhood >so that when I "make the rounds" I can just mark "good" or >"bad" as appropriate. Just need the *time* to do it! :-/ > >Thx, >--don Don, if you have access to the group: alt.binaries.e-book.technical Please note e-book not the other group with the name "books" There is a book posted called: "Wiley Wi-Fi Toys 15 Cool Wireless Projects for Home, Office, and Entertainment.pdf" that covers your situation. Have a pleasent trip Regards John
From: D Yuniskis on 25 May 2010 08:36
Hi John, John wrote: > On Mon, 24 May 2010 17:41:12 -0700, D Yuniskis > <not.going.to.be(a)seen.com> wrote: > >>>>>>> I'll drag out a GPS and get some actual measurements, >>>>>>> if necessary. I've not done an exhaustive survey >>>>>>> of where things work/don't work. Though I have found >>>>>>> the upper left corner to be a problem area as I am >>>>>>> often passing through there when I lose signal. >>>>>>> The antenna that I was *questioning* will (physically) >>>>>>> mate to a Linksys wireless router (though not intended >>>>>>> to do so, "just coincidence" -- sorry, I don't deal with >>>>>>> RF stuff so i can't tell you what sort of connectors >>>>>>> they are -- I don't think they will mate with the >>>>>>> base unit on the phone :<) >> Sorry, no, I had said I would drag the base up to the roof and >> walk the area to try to record where *exactly* the dropouts >> were with the base ON THE ROOF. Then, repeat the exercise >> with it back inside on the counter. I figured any other >> chat on the subject would just be speculative without >> hard facts. >> >> But, I've been busy getting ready for a 1,200 mile road trip >> (new tires, today... I'll change the oil tomorrow, etc.) and >> trying to get other "obligations" off my calendar. Cordless >> phone just didn't rise to the level of urgency to bump some >> of these other things :> >> >> I'll try to print out a couple drawings of the neighborhood >> so that when I "make the rounds" I can just mark "good" or >> "bad" as appropriate. Just need the *time* to do it! :-/ > > Don, if you have access to the group: > > alt.binaries.e-book.technical > Please note e-book not the other group with the name "books" > > There is a book posted called: > > "Wiley Wi-Fi Toys 15 Cool Wireless Projects for Home, Office, and > Entertainment.pdf" > > that covers your situation. I checked and none of the alt.binaries groups are covered on this server. But, I can chase it down elsewhere. Thanks! > Have a pleasent trip <grin> I'm not the one traveling. I just have to do all the *preparations*! :-/ (while it probably takes more total *time* than the drive, at least I don't have to commit to spending that time in one large *block*! ;-) (I'm getting cranky in my old age and find travel to be a real nuisance :< ) |