Scott Bruder
 Advanced Member Posts:564
 | | 15 Nov 2010 03:11 PM |
| So, now that I am a HAMMIE and will be installing the new Kenwood from Craig soon here is a question! When installing a HAM and CB in the same vehicle are there any special considerations to count for? Such as mounting the two radio's stacked on top of each other in the dash (as I want to do)? Do you need any separation, or buffer material between them? You know stuff like that! Also, as far as having both antennas on the vehicle do they need to be separated by a certain distance etc.? The CB install is easy for me! I am going to have a pro do all the wiring and grounding for the HAM, but want to do the physical install install myself so I get them where I want them! Any heldp would be appreciated! P.S. Would it be smart to make another "heavy duty" aluminum foil hat (two radios now you see) for use in the truck so I don't have to remember to take the one from my basement? | | |
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Grant Mossman
 Veteran Member Posts:1410
 | | 15 Nov 2010 03:28 PM |
| Scott, I have no idea on the radio/ant. placement questions... but if you have both in the truck you will need to carry lead in your pockets to protect your giblets from the conflicting radio waves.
The foil hat will not be necessary unless you are stopped for an extended period, or come anywhere near a public library. My wife is a librarian and can certify your hat if needed, I'm quite sure she's been asked before. | | | |
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Scott Bruder
 Advanced Member Posts:564
 | | 15 Nov 2010 03:31 PM |
| Luckily I already have lead underwear so I don't have to buy that! Does your wife know of a place I can buy a certified aluminum foil hat? I think mine actually has too many "crinkles" to be perfectly effective! | | | |
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Grant Mossman
 Veteran Member Posts:1410
 | | 15 Nov 2010 03:36 PM |
| I'll ask, it may be super secret though. In all seriousness I am curious about the response particularly regarding antennae placement. I hope to get my Pickup outfitting plans sorted out sooner than later and had not considered this issue; I'd like to know and not guess. | | | |
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Todd Eliason
 Veteran Member Posts:3523
 | | 15 Nov 2010 05:58 PM |
| I would separate the antennas by at least a foot if not more. the key up of a 50 watt radio can trigger the squelch on the other radio causing feedback. separation is more important if you would be using both at the same time, but I doubt that would happen. putting an antenna on each side of your hood or roof top would be sufficient. | | | |
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Scott Bruder
 Advanced Member Posts:564
 | | 15 Nov 2010 06:44 PM |
| Thanks Todd! I was thinking the CB antenna on the bumper and the HAM on the rear rack so that should be more than emough! I also doubt I would be using them at the same time! Also is it bad if the HAM antenna touches metal or antything else when being used? For instance my idea was to mount it on one of those big antenna springs so it will bend and not break when going under trees etc. If I am using it when it is rocking back and forth and say touches the roof rack is that bad?
Also, any thoiughts on the mounting the two rdios next to each other? | | | |
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Todd Eliason
 Veteran Member Posts:3523
 | | 15 Nov 2010 07:02 PM |
| The biggest thing for the HAM antenna is a good groundplane. I have not heard of the antenna hitting the truck occasionally being an issue but it may effect the output while it is connected. Just get good airflow around the radio as they can heat up and possibly overheat the radio. many radios have fans that you should allow airflow to. | | | |
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Todd Eliason
 Veteran Member Posts:3523
 | | 15 Nov 2010 07:10 PM |
| So thinking about this, I might consider putting the CB on the rack with the spring, and the Ham Antenna on the bumper. I don;t know specifics on it but CB's seem to be better on springs and the height will help the am output on the trail. I'd protect the more expensive 2M antenna on the bumper with it's high output and you can see if you lose the antenna, which would hurt the expensive radio if it does not have an antenna....
Just my initial thoughts. | | | |
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Scott Bruder
 Advanced Member Posts:564
 | | 15 Nov 2010 10:20 PM |
| good point | | | |
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Jerry
 Basic Member Posts:158
 | | 16 Nov 2010 12:55 AM |
| Antenna Basics 101; Mobile Ham Antennas vs. CB Antennas
~Most mobile ham antennas are flimsy, fragile, skinny junk and are sold to a group of hobbyists who are notorious cheapskates. Mostly good guys, but cheapskates nonetheless. Many of these folks drive 1985 Oldsmobiles to and from the grocery store and dodge oncoming bumblebees so as not to damage their antennas. Should you install one of these ballerina antennas on your 4x4 it will be your never ending job to protect it. Good luck!
~Most mobile CB antennas are fat, ugly and tough and sold to a group of eastern Skagit County refugees who install one on either side of their lifted 4x4 pickups quipped with 72" tractor tires and proceed to drive said truck over 16 vehicles all painted with blue and white stripes. These guys crash their antennas into stop lights and break tree branches. If you install one of these brutes it will outlast your vehicle.
And that is almost the truth.
All antennas want to be set in the middle of the roof. If you can't do that try to mount them as high as possible keeping in mind you will probably have to remove your ham antenna when going through brush. Or, attach your ham antenna to your roof rack via an electrically adjustable mount controlled from the cab. There are some neat spring mounted 2/70 dual band antennas that take a good beating, but their db rating is less than many others. It just depends on what you expect from your radio. If you don't already have one order a catalog from HRO (google them) and check out various options. An outside wound fiberglass CB antenna mounted to a spring will take a beating. Wherever you mount your antennas try to keep them 2' apart.
Here's a neat tip for inside your rig. When you have both the CB and 2-meter radios going at the same time, as we often do on our PNWBA tours, it sometimes gets confusing. To help prevent this mount remote speakers on either side of the cab, i.e. right ear=CB, left ear=Ham. It works!
I don't think it matters which of the two radios are mounted on top or bottom. As mentioned in an earlier post your ham radio should have plenty of air circulation.
Oh, if you have a single band 2-meter radio there is a tough outside wound fiberglass antenna available and it's made by Firestick. It seems to me it's around 2' tall, but I don't recall the db rating. Mount it on a spring just like the CB antenna and both will take a lot of abuse. | | | |
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Scott Bruder
 Advanced Member Posts:564
 | | 16 Nov 2010 09:04 AM |
| Thank you for the long and informative diatribe! Thats just what I needed to know! My HAM will only be for local (on the trail really) communication! I don't like people enough to want to talk to them from my basement all day! So, I am not worried about having too much antenna! My radio is a Kenwood D710A which I plan to mount under the drivers seat with the remote faceplate on the dash above the CB! It is a dual band so I will have to look for an appropriate antenna option at HRO!
Thanks for all the help guys! | | | |
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Amos Aarsvold
 Basic Member Posts:160
 | | 16 Nov 2010 09:55 AM |
| Thanks for the Firestik tip Jerry! I hadn't thought to check them for HAM antenna's. I am a little confused though, I didn't think HAM antennas needed to be tuned. | | | |
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Terrance Bailey
 Basic Member Posts:352
 | | 16 Nov 2010 05:07 PM |
| i have the Larsen NMO 2/70B (www.universal-radio.com/catalog/hamantm/larsenm.html half way down the page on the right) mounted to my front bumper. def not the best place for it since just about every branch or clump of brush next to the road catches it but other than developing a bit of a lean it has held up well. as far as the abilities of the antenna i have no complaints. | | | |
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Jerry
 Basic Member Posts:158
 | | 16 Nov 2010 07:04 PM |
| I run a Larson NMO2/70B on my pickup as well as my little Bronco II. Both are mounted on the left-front fender. The antenna fares well on the pickup because I usually don't drive it through the brush, but the Bronco II is a different story. You should see all the contortions that antenna goes through when I forget (or purposely neglect) to remove it before entering the brush. It usually comes out bent backwards almost to the outside mirror, the coil clogged with sticks and leaves. Once it came through a tunnel of brush bent straight forward and I don't have a clue as to how that happened. It's getting to be good sport to see what happens to my antenna. Check out the Larson NMO2/70SH dual bander. It's the shorter spring mounted version I was referring to in my post above. My son-in-law is running one on the roof of his SUV and he has a different brand, but similar design CB antenna mounted about 2' behind. Both antennas have held up well and he never removes them for encroaching brush. I must admit that I am impressed with the "SH". | | | |
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Todd Eliason
 Veteran Member Posts:3523
 | | 16 Nov 2010 08:17 PM |
| I run Larsons as well and have always been happy with them. just make sure you get a pre-tuned one so you don't have to measure and cut. | | | |
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Craig Miller Posts:11803
 | | 16 Nov 2010 08:21 PM |
| Grrr... just lost my reply with the Quick Reply. Time to get in the habit of hitting "Add Reply". | | | |
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Scott Bruder
 Advanced Member Posts:564
 | | 16 Nov 2010 08:32 PM |
| Wow awesome responses! I love research | | | |
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Craig Miller Posts:11803
 | | 16 Nov 2010 10:59 PM |
| I have a Diamond NR770HB. I've had it mounted on the roofrack with the Diamond motorized mount, on the tire carrier on the rear door, and now on the front brushguard.
The roofrack mount got fantastic reception/transmission when up, but it seemed like I had to run with it down on just about every trail. Since I wasn't used to it being up, I regularly forgot about it when concentrating on my driving and ran it into things. The motorized mount can be adjusted such that the antenna will fold, rather than break, when it gets smacked into things. With the antenna in the down position it couldn't be seen at all due to the rack basket. In the up position, it somehow looks "right" and as a result isn't that noticeable.
The rear tire carrier seemed to work fine. It didn't transmit/receive quite as well, but it never got hit by brush even on the thickest of trails, and the range was still acceptable. The antenna is nicely hidden back there too.
Right now I have it on the front brushguard just barely to the passenger side. This should do fine with thick brush, should transmit well in 360 degrees, but is *really* obvious and as a result it looks a bit ugly. If I decide to leave it there, I'm going to remove the antenna in town and put a Diamond DL30A dummy load on it.
Craig
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Mike Rupp
 Veteran Member Posts:1355
 | | 17 Nov 2010 05:49 AM |
| Craig, have you thought of just running a really small antenna instead of a dummy load when around town? I have a 16" Comet antenna that is really tiny compared to the Diamond. I use that when I'm on the trails on the roofrack and it seems really durable so far. Just a thought. | | | |
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Craig Miller Posts:11803
 | | 17 Nov 2010 12:49 PM |
| That's a good idea Mike. I'll consider it. I suspect my wife will still ask me to remove it when she gets in the truck. It's right in the passenger line of sight. I think it's so obvious because it isn't a place where you normally see AM/FM radio antennas. | | | |
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