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Old 02-19-2010, 04:09 PM   #301
Adam H
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I just ordered a 1001z and a K30! Pictures will come once I find a car in which to install them for any reasonable length of time.
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Old 02-19-2010, 11:12 PM   #302
firefighting03wrx
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2003 Audio and visual set up <<<<Thread i will have pics up soon
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Old 02-28-2010, 02:47 AM   #303
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alright, so I just got a cobra 19DXIV cb and two antennas from a friend. I have the cb mounted and ready and I have been contemplating where to mount the antenna. I really dont like the look of an antenna all the time, so I made a trunk clamp that can be removed, but what I really want to do is to remove the stock radio antenna (dont use it) and fit the cb antenna so that it can be moved up and down. I figured that more is better, so It would be so that when it is pused all the way into the a pillar, there would still be 1-2 feet still sticking out. any thoughts? and if I do this, can I wire up my radio to the same antenna, and just use one or the other?
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Old 02-28-2010, 02:55 AM   #304
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oh and my idea was that this would be great because i could mark on the antenna where it is tuned perfectly, and when i want to use it, i can just pull it out to the mark on the metal, and be set...
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Old 02-28-2010, 06:04 AM   #305
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The antenna should be perpendicular to the ground and a large metal plane or it will not work very well. Correct williaty?
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Old 02-28-2010, 07:49 AM   #306
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Quote:
Originally Posted by Blubullt02 View Post
alright, so I just got a cobra 19DXIV cb and two antennas from a friend. I have the cb mounted and ready and I have been contemplating where to mount the antenna. I really dont like the look of an antenna all the time, so I made a trunk clamp that can be removed, but what I really want to do is to remove the stock radio antenna (dont use it) and fit the cb antenna so that it can be moved up and down. I figured that more is better, so It would be so that when it is pused all the way into the a pillar, there would still be 1-2 feet still sticking out. any thoughts? and if I do this, can I wire up my radio to the same antenna, and just use one or the other?
Not going to work. The CB antenna has a loading coil, it isn't just a metal whip. Also as stated it needs to be mounted on a metal ground plane i.e. the car body or trunk. And you can't wire your broadcast radio to it.
I recall there was a gizmo made years ago that split the car's broadcast antenna to use with the radio and a CB, but it didn't work very well. The loss through the impedance matching network would result in very little RF power actually being transmitted.
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Old 02-28-2010, 10:35 AM   #307
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Quote:
Originally Posted by Blubullt02 View Post
what I really want to do is to remove the stock radio antenna (dont use it) and fit the cb antenna so that it can be moved up and down. I figured that more is better, so It would be so that when it is pused all the way into the a pillar, there would still be 1-2 feet still sticking out.
It'll suck.

Quote:
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The antenna should be perpendicular to the ground and a large metal plane or it will not work very well. Correct williaty?
For these reasons and more.
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Old 02-28-2010, 10:58 AM   #308
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For all who are struggling with an antenna setup, the NMO mount that Ty recommends is superior to anything out there. At the recent Sno*Drift Rally I did radio communications for several of the stages. There was one stage whose midpoint was at a dangerous road intersection and they needed a radio there to make sure no one was in the way once the stage went hot. Several had tried to hit the repeater from that spot and no one could do it reliably even on 50 watts. They asked if I could try and I was able to hit it with 5 watts. It's all about the antenna.

Also, the NMO mount antennas can be removed in a matter of seconds and capped with a $6 rain cap when you don't need to use the radio.

Only drawback to NMO is they require a 3/4" diameter hole in your roof.

Mitch
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Old 02-28-2010, 02:55 PM   #309
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Quote:
Originally Posted by Mulder View Post
Not going to work. The CB antenna has a loading coil, it isn't just a metal whip. Also as stated it needs to be mounted on a metal ground plane i.e. the car body or trunk. And you can't wire your broadcast radio to it.
I recall there was a gizmo made years ago that split the car's broadcast antenna to use with the radio and a CB, but it didn't work very well. The loss through the impedance matching network would result in very little RF power actually being transmitted.
allright! just checking. I finished making another mount, for the second antenna, both are going to clam onto the front end of the trunk. It will do for the few trips i go on.
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Old 02-28-2010, 03:14 PM   #310
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ok here's mine...... you can guess why it's hidden though (I'll never tell)

only has a range of about, IIRC 380ft...... but that's plenty for my use (Moab entertainment, road trips)

Antenna is mounted in passenger side A pillar, there IS a cover that goes over it too (just taken off for photo purposes) and the radio is mounted in the glovebox. It's wired to the fuse box via add-a-circuit (or whatever it was)



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Old 02-28-2010, 03:20 PM   #311
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^
Wow that's about the worst place to put an antenna. SWR must be horrible, I hope you don't make very long transmissions.
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Old 02-28-2010, 03:24 PM   #312
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yeah, at that point, just hang a coathanger from the rear jesus handle and call that an antenna.
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Old 02-28-2010, 03:24 PM   #313
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^^ Like I said...... its pretty bad, but it works for my applications. Short transmissions too lol

edit: one of the previous 5 owners had a cb mounted on the roof (think SWRT style) it apparently "broke off" in the car wash, so I had to seal the hole.

I drive with one down there because it looks god awful on my car anywhere else.
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Old 03-01-2010, 04:59 AM   #314
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...so what is the point of that?


Also, I'm not opposed to the thru-the-roof antennas, but it looks like the roof is too thin and they wind will really be pulling it around and flexing the roof. Does this prove to be the case?

Last edited by CKxx; 03-01-2010 at 05:24 AM.
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Old 03-01-2010, 06:38 AM   #315
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The roof doesn't flex with the two antennas I use. And the roof metal is thicker than I thought. From my semi-trained eye I'd guess it's in the 16-18 gauge range.
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Old 03-09-2010, 03:32 PM   #316
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(flame suit)

I have a CB, and a trunk mounted antenna, however i was wondering can handheld "walkie talkies" communicate with a cb?

For instance, say on a rally/car show etc where there might be a "caravan"... could i just give another driver a walkie talkie so they could communicate at a particular channel?
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Old 03-09-2010, 03:44 PM   #317
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Quote:
Originally Posted by xchristensen View Post
(flame suit)

I have a CB, and a trunk mounted antenna, however i was wondering can handheld "walkie talkies" communicate with a cb?

For instance, say on a rally/car show etc where there might be a "caravan"... could i just give another driver a walkie talkie so they could communicate at a particular channel?
If you're referring to the FRS/GMRS radios, then no.
CB is 27 MHz AM, FRS is 460 MHz FM. Totally different frequencies and modes of transmission.
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Old 03-09-2010, 04:02 PM   #318
Adam H
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There are, however, handheld CBs. I imagine the range is atrocious, but they exist.
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Old 03-09-2010, 04:13 PM   #319
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they do suck, I used to have one, and the range outside was bad, and non-existant inside a car. on a side note I just ordered my cobra 75, k40 and swr meter. also in a couple weeks I will probaly be doing a cb tuning meet at the university of rhode island so if there is anyone local to that and needs a tune keep an eye out in nesic for a upcoming thread.
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Old 04-09-2010, 11:02 PM   #320
vision.dynamix
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I put a Cobra 19 Ultra III in my car ($32 at WalMart!), mounted to the passenger side of the trans tunnel console piece thing, hard wired to the radio.

I ran a 10' Coax under the console, under the rear seat, up to the top right corner inside the trunk, with a barrel connector. This way there are no dangling wires in my car.

I plan on mounting a Mag Mount to the roof..put a piece of painters tape on the roof first, put hte antenna down, tape the antenna's base down, and then tape the coax down to the trunk where it will meet with the barrel connector.

I havent tested it out yet, because I originally wasnt going to use the $12 mag mount from WalMart..but I need it for a trip tomorrow so I have no choice.
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Old 04-11-2010, 04:05 PM   #321
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Well, I had my IC-2720 out of the car yesterday, updated all of the local repeaters in it. Also did the extended TX/RX mod as well.

I'm looking at installing an NMO mount 2m/440 antenna. I currently have a small MFJ 2m/440 mag mount on the trunk, and have a much larger mag mount Comet SBB7 that I keep in the trunk for things like Field day. We contacted the International Space Station on field day last year from my car on the SBB7. For being a mag mount antenna, I was VERY impressed at it's performance, especially in making a contact with the ISS.
I love having the SBB7 on, but it's huge, and doesn't look very good, IMO.

I'm going to be upgrading the IC-2720 to a D-Star capable radio in the future. I'd like to go with the IC-2820 because it is full duplex, but I've heard from a few people that they are rather unhappy with it, and Icom is going to be releasing a new radio to replace it in the near future(probably at Dayton).
I already have an IC-91AD, but I need to get a mobile with some real power, 5 watts isn't cutting it around here as the D-Star repeaters aren't very popular yet.

Speaking of Dayton, is anyone going this year? I should be there. If anyone is gonna be there, let me know and I'll try and meet up with you there.


I'm going to be adding a 900mhz radio into the car soon as well, so I need to find a place to install that, and have to look at antenna options. Would like to do NMO as well, but I'm nervous about drilling one hole in the roof, let alone 2.

I really want to buy an older Ford Explorer or something 4x4 and just go crazy with that installing radios and antennas.
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Old 04-12-2010, 09:33 PM   #322
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This is an awesome thread, guys. Thanks so much for all this great info.

I have an '07 2.5i and have been thinking about how I want to do this. Right now I just have a little Yaesu VX-2 HT, but you'd be amazed at how easily you can hit repeaters miles and miles away just with that a halfway decent antenna. My friend has a used CVPI that had an NMO mount sort of up towards the front of the roof, and grabbed the coax lead from it and put it into his VX-3. Then he got a cheap quarter-wave and just stuck it on the NMO. We were talking to repeaters at least 10 miles away crystal-clear with no static. It was incredible.

Ideally, I'd like to have an NMO mount in the center of my roof, with cable leading down through the pillars into the cabin to whatever mobile unit I end up purchasing (right now I'm looking at an FTM-350R, unless I can find an ICOM equivalent with D-STAR), and another NMO in the middle of my trunk for a CB antenna, with another cable leading forward to wherever I end up putting a CB. Not sure where that's gonna go though. I still have a DIN slot available for either.

The number one thing I'm worried about right now is how the hell to get the cable down from the NMO mount across the head liner to the frame and into the pillars. Is it really tough dealing with the head liner? My buddy with the CVPI has expressed that he never wants to take his down again!

TIA

EDIT: I was thinking about going to Dayton, but I have a friend coming in from Denver that weekend so it's looking less and less likely. 73 anyway DE KC2KOA
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Old 04-12-2010, 09:52 PM   #323
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Personally, I think it's pretty damned easy to drop the headliner and run the wire down the pillars. Then again, I now think that pulling the engine out and putting it back in is a pretty easy 5 hour job.
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Old 04-12-2010, 11:27 PM   #324
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Heh. Don't suppose you have a convenient link to a walk-through/ other guide around, do you?

EDIT: Can someone with more experience than this extremely green ham explain to me how it is that the same antenna can provide good performance on 146, 220 and 460 MHz? Is it because it's quarter-wave on 146, half-wave on 220 and full-wave on 460... even though I don't think that math quite works out?

Last edited by starkruzr; 04-12-2010 at 11:37 PM.
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Old 04-13-2010, 10:59 AM   #325
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Well, first of all, "good" is EXTREMELY relative. It's more "good" than, say, a hot dog on 220. Second, it's the dual loading coils (one in the base, one part way up the whip). At VHF, the radio "sees" the whole antenna. At UHF, the mid-whip coil goes into resonance and the radio only "sees" the lower portion of the antenna. Now, that's a HORRIBLY WRONG explanation of what's going on, but it gives you the right mental picture, if you know what I mean
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