Adapting a Garmin Traffic Receiver to car antenna?
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From: mpm on 23 Feb 2010 18:00 On Feb 23, 3:59 pm, DaveC <inva...(a)invalid.net> wrote: > > The car's antenna probably won't work better. > > It is tuned for the FM band, not the GPS band (1.2 or 1.4 GHz, if > > memory serves...?) > > > Also, many GPS antennas that I've played with have built-in > > amplifiers, tuned to GPS spectrum, which your car antenna won't have. > > > Not saying it won't work -- but I would expect great performance. > > Maybe I should explain a little... > > The FM Traffic service is a supplementary broadcast subscription service > using some sub-carrier of the FM broadcast band (88-108 MHz). It carries > traffic "events" information (accidents, roadwork, etc.). The receiver is > located within the cigarette-lighter power adapter, and the antenna is in the > 6-foot cable between the adapter and the plug that attaches to the GPS > cradle. > > So we're talking broadcast band here, not GPS band. Oh. I didn't understand what you were trying to get at. I have a broadcast background. The correct term for what you are talking about is "RDS" Link: http://en.wikipedia.org/wiki/Radio_Data_System Not familiar with your Nuvi GPS (Mine is an old Garmin III, but hey, it still does everything I need it to -- and a few things the newer models DON'T do!!) Since I'm not familiar with yoru GPS, I'll gracefully bow out now.... Good luck! -mpm
From: Rich Webb on 23 Feb 2010 18:30 On Tue, 23 Feb 2010 12:25:39 -0800, DaveC <invalid(a)invalid.net> wrote: >Garmin makes an "integrated" FM traffic info receiver for some models of GPS >that allows connection to the car's AM/FM antenna. But not my model (Nuvi >660); I must use only the GTM20, a cigarette-lighter-powered model: > ><https://buy.garmin.com/shop/shop.do?pID=403> > >Benefits of using the car's antenna are mostly stealth: the >cord-that-is-the-antenna between the cigarette lighter (which will be >relocated inside the glove box) and the GPS plug that lays on the dashboard >makes for an advertisement to crooks. And the car's antenna would, arguably, >work better. > >What are my options re. adapting the GTM20 to work with the car's antenna? >Could this be as simple as splicing in a motorola antenna plug to the cable? Belay my last... It looks like the newer GTM-20 models do in fact have a receptacle for a connector to an external antenna. Mic'ing it out, the diameter looks like it takes a 1/8" plug (3.5 mm is too large). The (fuzzy) picture in the manual shows just a tip/ring configuration (reasonable for an antenna) and claims that it's available at the Garmin store. Their store search is abysmally bad, though, so if it's even there it'll take patience finding it. -- Rich Webb Norfolk, VA
From: artie on 23 Feb 2010 20:40 In article <0001HW.C7A979C3009EF110B08A39AF(a)news.eternal-september.org>, DaveC <invalid(a)invalid.net> wrote: > Garmin makes an "integrated" FM traffic info receiver for some models of GPS > that allows connection to the car's AM/FM antenna. But not my model (Nuvi > 660); I must use only the GTM20, a cigarette-lighter-powered model: > > <https://buy.garmin.com/shop/shop.do?pID=403> > > Benefits of using the car's antenna are mostly stealth: the > cord-that-is-the-antenna between the cigarette lighter (which will be > relocated inside the glove box) and the GPS plug that lays on the dashboard > makes for an advertisement to crooks. And the car's antenna would, arguably, > work better. > > What are my options re. adapting the GTM20 to work with the car's antenna? > Could this be as simple as splicing in a motorola antenna plug to the cable? > Or...? > > Ideas? > > Thanks. > I wired the receiver for my 680 to an accessory jack that's switched with other stuff; it's hidden, and the cord to the 680 runs under the dash. Everything works well, with the wiring hidden.
From: ps56k on 23 Feb 2010 22:05 "Rich Webb" <bbew.ar(a)mapson.nozirev.ten> wrote in message news:evo8o5pank0carhhjd8664l8iqm82gclcb(a)4ax.com... > On Tue, 23 Feb 2010 12:25:39 -0800, DaveC <invalid(a)invalid.net> wrote: > >>Garmin makes an "integrated" FM traffic info receiver for some models of >>GPS >>that allows connection to the car's AM/FM antenna. But not my model (Nuvi >>660); I must use only the GTM20, a cigarette-lighter-powered model: >> >><https://buy.garmin.com/shop/shop.do?pID=403> >> >>Benefits of using the car's antenna are mostly stealth: the >>cord-that-is-the-antenna between the cigarette lighter (which will be >>relocated inside the glove box) and the GPS plug that lays on the >>dashboard >>makes for an advertisement to crooks. And the car's antenna would, >>arguably, >>work better. >> >>What are my options re. adapting the GTM20 to work with the car's antenna? >>Could this be as simple as splicing in a motorola antenna plug to the >>cable? > > Belay my last... It looks like the newer GTM-20 models do in fact have > a receptacle for a connector to an external antenna. Mic'ing it out, the > diameter looks like it takes a 1/8" plug (3.5 mm is too large). The > (fuzzy) picture in the manual shows just a tip/ring configuration > (reasonable for an antenna) and claims that it's available at the Garmin > store. Their store search is abysmally bad, though, so if it's even > there it'll take patience finding it. > > -- Where is the antenna connector you are talking about ? This photo shows the 12v DC tubular connector - with the 12v center pin contact - https://buy.garmin.com/shop/alt-image-lg.do?pID=403&img=productImageLarge and going to the special 18-pin flat connector for the GPS https://buy.garmin.com/shop/shop.do?pID=403#specsTab
From: ps56k on 23 Feb 2010 23:47
"DaveC" <invalid(a)invalid.net> wrote in message news:0001HW.C7A979C3009EF110B08A39AF(a)news.eternal-september.org... > Garmin makes an "integrated" FM traffic info receiver for some models of > GPS > that allows connection to the car's AM/FM antenna. All of these receivers have the Traffic FM receiver module embedded in the DC adapter, on inline on the power cable - https://buy.garmin.com/shop/shop.do?cID=203 AND - as per the manuals - some DO HAVE a special connector for an external antenna which in the manual appears to be located directly on the inline module... In looking over this list - and actually downloading the manuals, it's hard to tell the difference between them - and the "18-pin flat plug" is for those special CRADLE mounts, while others are for the mini-USB on the GPS itself... It is a bit confusing - even have the GTM-20 listed twice, but with different hardware features... |