6.5dBi Bullbar Mobile Antenna

Submitted: Tuesday, Jul 07, 2015 at 16:57
ThreadID: 119418 Views:2708 Replies:11 FollowUps:9
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ok I parked my car in the main street of Broken Hill today and when I got back some one has snaped the bull bar mounted antenna for the CB radio

Now I do not have a spare CB antenna but I have a spare mobil phone antenna


this one of the white ones

So it has the same connection as the CB radio so can I use that till I get a new CB radio UHF antenna

Thanks
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Reply By: Whirlwinder - Tuesday, Jul 07, 2015 at 17:14

Tuesday, Jul 07, 2015 at 17:14
Hi Allein, Now I am no radio whiz but I think the mobile phone frequency and the CB (UHF??) are so different that it will do damage to the CB.
You will have to buy a new one sometime so why not now.
AnswerID: 556747

Reply By: Member - John and Val - Tuesday, Jul 07, 2015 at 17:28

Tuesday, Jul 07, 2015 at 17:28
Allien,

As W-W has said, the frequencies are very different and you could damage your radio if you ask it to push power into the phone aerial. Being tuned to such a different frequency most of the transmitter power will be reflected back into the transmitter and very little will get out into the world. It's a pita but I wouldn't risk using the phone aerial, which will be pretty ineffective anyway.

Cheers

John
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AnswerID: 556748

Reply By: TomH - Tuesday, Jul 07, 2015 at 17:53

Tuesday, Jul 07, 2015 at 17:53
Dont transmit from the broken one either Have seen people driving around without the whip on it. Will blow your output side if you do.
AnswerID: 556750

Follow Up By: Frank P (NSW) - Saturday, Jul 11, 2015 at 17:09

Saturday, Jul 11, 2015 at 17:09
I think many (but admit not all) UHF CBs have protectction for that. My Uniden does.
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Reply By: Member - Terry W4 - Tuesday, Jul 07, 2015 at 18:54

Tuesday, Jul 07, 2015 at 18:54
My radio came with two antennas a 6.5 and a quite small I think 4.5. Plus I keep a small portable in the 'glove box'.

Not nice that some one broke it off - but I have always thought you need to have a back up strategy.

AnswerID: 556753

Follow Up By: Member - Keith P (NSW) - Tuesday, Jul 07, 2015 at 21:21

Tuesday, Jul 07, 2015 at 21:21
Broken Hill has nose in parking ,doesn't it??
It would be an opportunity to good to pass up for some low-life oxygen thief to amuse their tiny miniscule mind hey!!
I always remove my bullbar aerial in towns where nose in parking is used ..plus wind radio aerial down too. My Mum always has a chuckle whenever I,m in Dubbo as I do the rounds of the truck removing stuff that can be damaged.

Cheers Keith
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Follow Up By: allein m - Wednesday, Jul 08, 2015 at 08:18

Wednesday, Jul 08, 2015 at 08:18
yes the main street is all nose parking

thank you for the feed back I just paid rego so I will save up and buy a new one in town asap

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FollowupID: 843039

Follow Up By: vk1dx - Wednesday, Jul 08, 2015 at 10:09

Wednesday, Jul 08, 2015 at 10:09
We have two mounts, with one on each mudguard. Not the best spot but it does us. One antenna in use and a spare ready to go by just changing the cable at the radio. Not expensive ones either. Lost some in a previous hobby from the bullbar and mudguards.
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FollowupID: 843046

Reply By: Nomadic Navara - Wednesday, Jul 08, 2015 at 09:11

Wednesday, Jul 08, 2015 at 09:11
Yes you can use your phone or any other antenna that will screw on to the mount to get some communications. It will not be as efficient as a tuned antenna but you will still get a bit of range. In other words, any wet piece of string will work a bit as we say in the trade.

Don't worry about transmitter damage. All sets are well protected these days. The don't use it scare only applied to two way radio transmitters in the 1960s.

Is there a DSE of Jaycar stockist in the Hill? They should have replacement whips.
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AnswerID: 556775

Follow Up By: allein m - Wednesday, Jul 08, 2015 at 09:47

Wednesday, Jul 08, 2015 at 09:47
I just put a old ex army foot locker up in facebook local buy swap sell to get a antenna for the present

thanks
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Follow Up By: vk1dx - Wednesday, Jul 08, 2015 at 10:19

Wednesday, Jul 08, 2015 at 10:19
I have actually used the top wire on a farmers fence to show what can be used for emergency communications. But that was with a different job and it was with much more sophisticated equipment than just a CB radio.

Yes, in an emergency you can use it and very briefly, but the signal will be almost unreadable beyond a few hundred meters, that is if it even gets that far.

A damaged, broken or even just a random length of wire will reflect most if not all of the signal back to the radio. The output circuitry in modern radios can handle some reflection. But not a lot and not for long. You will destroy it if you continue. The radio will then automatically cut back the transmission to hopefully not allow this reflected signal to damage the radio.

Buy a cheapie for the "back seat" and get another for the front.

Phil
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FollowupID: 843048

Reply By: TomH - Wednesday, Jul 08, 2015 at 10:08

Wednesday, Jul 08, 2015 at 10:08
Did they just break the whip off it or the whole thing The whip for a GME 4018k is about $35

Here is a good price for the whole thing

http://www.gadgetcity.com.au/gme-ae4018k1-6.6dbi-uhf-fibreglass-antenna-p-296.html?gclid=CjwKEAjw8e2sBRCYte6U3suRjFESJAB4gn_gC70xazPvabdMvvvvkV6bkn3rSRxmeTVTSfWcx8h6PxoCNUHw_wcB&zenid=f81bfbf59b728616357505cf7ca6b69b
AnswerID: 556781

Reply By: allein m - Saturday, Jul 11, 2015 at 15:00

Saturday, Jul 11, 2015 at 15:00


ok went to local shop and picked up this antenna nothing fancy I said just want it to work

now put it on went to channel 1 tested it out on local repeater nothing drove into town next to repeater it works

ok that got me stumped went back to shop no idea

ok last night I went to Google ad did some reading up one site said this type of antenna is not suitable for bull bar use

ok this car was owned by Lachlan Shire before I bought it

now I was looking at the boot and some thing I did not notice 4 small hole in boot wall some one has put a antenna on each side of the rear quarter so off to the shop bought a bracket and fitted it and yes got the repeater right away


so a word to the wise if you buy one of those antenna s and put on the bull bar and it does not work try relocating it to another part of the car

what annoys me is the people at the shop said it would not make any difference and they are supposed to know about this type of thing

cheers and thanks for the help

AnswerID: 556876

Follow Up By: allein m - Saturday, Jul 11, 2015 at 15:04

Saturday, Jul 11, 2015 at 15:04
I should add the radio did work but the reception was down and the only way I realized that was the repeater

I know I was able to get it before at home

if I had not known about the repeater I would have left it not realizing I had a problem
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FollowupID: 843165

Reply By: Nigel Migraine - Saturday, Jul 11, 2015 at 17:37

Saturday, Jul 11, 2015 at 17:37
If you cut a piece of wire, any old wire, 310mm long and connect that to the antenna stub or the centre pin of the socket and *insulate* it from the bodywork that will work reasonably well. Maybe tape it to a piece of wooden dowel and tape the dowel to the bullbar. This antenna, like your original, should be mounted vertically.
AnswerID: 556880

Reply By: pop2jocem - Saturday, Jul 11, 2015 at 19:05

Saturday, Jul 11, 2015 at 19:05
Well this is interesting.

We have some varying opinions.

"DON'T DO IT, YOU WILL BLOW YOUR RADIO TO BITS.

A LUMP OF FENCING WIRE WILL ONLY TRANSMIT FROM THE 'ROO BAR TO THE BACK BUMPER.

AN OLD WIRE CLOTHS HANGER WILL WORK JUST FINE.

I think I might just stick to a dedicated aerial.........just in case (;=))

Cheers
Pop
AnswerID: 556882

Reply By: Swaggie - Sunday, Jul 12, 2015 at 00:34

Sunday, Jul 12, 2015 at 00:34
Hi


I can only suggest what I do, around town I use my RFI 3db aerial (good luck with them snapping that) and if you still want to use your radio you can.. Then when I go away I swap it for the 6.5db .. In The High Country I use the 3db anyway...



Goodluck.
AnswerID: 556895

Reply By: allein m - Sunday, Jul 12, 2015 at 08:47

Sunday, Jul 12, 2015 at 08:47
any one have a idea why the new antenna did not work so well on the bull bar refering back to the picture I posted
AnswerID: 556904

Follow Up By: Nigel Migraine - Sunday, Jul 12, 2015 at 10:06

Sunday, Jul 12, 2015 at 10:06
Because it didn't have a "ground plane" when it was mounted on the bull-bat.

A vertical antenna, such as yours, needs a second electrical pole and that is normally provides by a conductive network directly underneath the vertical.

When mounted on the bull-bar there is very little metal under it, where you have it now is better but far from ideal - you will find the antenna, in its current location, will work better in some directions than in others. This is due to its radiation not being symmetrical because of an unequal ground plane.

The ideal place to mount a vehicle antenna is in the centre of the roof but, usually, this is not practical and compromises have to be made.

Your antenna should work well enough for your needs in its current location.
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FollowupID: 843196

Follow Up By: allein m - Sunday, Jul 12, 2015 at 11:20

Sunday, Jul 12, 2015 at 11:20
I just got back from the shops and it works much better now and a lot clearer


thanks

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FollowupID: 843201

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