CB vs UHF radios

Submitted: Thursday, Apr 01, 2004 at 11:31
ThreadID: 11729 Views:6857 Replies:6 FollowUps:4
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I have recently bought a second hand landcruiser which came equipped with two radios. I assume one is a normal CB whereas one is a UHF radio. How can I tell?

Also, it only has a small antenna on the top of the roof but has fittings for attaching a much larger antennae to the bullbar. Will I need to buy one of those large antannaes to use the radios over long distance?

Thanks in advance,
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Reply By: Roachie - Thursday, Apr 01, 2004 at 11:43

Thursday, Apr 01, 2004 at 11:43
What are the brand/s and models of the 2 radios? We may be able to tell from that which is which as far as UHF and AM/27meg CB is concerned. They are both classed as "Citizen Band" as far as I know; meaning that Joe-Public (ie: citizen) can use either without any worries.
UHF has largely taken over from the older 27meg/AM technology, although latter does have it's advantages as far as distances able to be achieved using "skip"....but that's a bit hit & miss and you wouldn't want to be relying on it.

With 2 radios fitted, you'd need to have a separate antenna for each one (they are different types for each too.)

I would expect that the roof-mounted one would be for the UHF radio and even though it's only small, it probably has more "power" for transmit/receive that a larger aerial mounted on the bullbar. This is because a UHF antenna works better with a large "ground-plane" to assist send/receive messages. The roof acts like a satelite dish to gather signals and concentrate them on the antenna. I'd be leaving that one there.

If there is a base located on the bullbar, it maybe the location of the antenna for the 27meg CB. You'd need to get hold of a proper 27meg aerial and screw it on to see if it would work okay, but you may not get a response to any request for a radio check as no-one uses them much anymore.

Good luck


AnswerID: 52788

Reply By: The Banjo - Thursday, Apr 01, 2004 at 12:27

Thursday, Apr 01, 2004 at 12:27
Indeed as Roachie says .....both are CB......one UHF as you say....the other HF probably (known as 27 meg, but still in the HF band). Make and model names will go a long way - expect many forumites will have them (or once did). As I see it - UHF is clear, popular, but comparatively 'local' in range. HF-CB is 'hashy', unpopular, but long range can be good (IF it has Side Band mode within - AM mode is really local))- the SB reach can be great, but not reliably so - much affected by HF "conditions". Don't chuck 'em out - with a bit of a tidy up, they might both be winners.
AnswerID: 52795

Reply By: Truckster (Vic) - Thursday, Apr 01, 2004 at 14:50

Thursday, Apr 01, 2004 at 14:50
HF is 27meg? na.

anyway search the archives for this, theres about 2 dozen threads on 27meg V UHF....
AnswerID: 52816

Follow Up By: Ray (Geelong) - Thursday, Apr 01, 2004 at 17:59

Thursday, Apr 01, 2004 at 17:59
He's correct Trucky, 27 megs is near the top end of the HF spectrum
FollowupID: 314635

Follow Up By: Member - Allan - Saturday, Apr 03, 2004 at 13:57

Saturday, Apr 03, 2004 at 13:57
Truckster, he is correct, 27 meg is in HF spectrum (2 - 30meg). It is possible to program the 27 meg frequencies into an HF radio but power output is too high to transmit legally.
FollowupID: 314833

Reply By: PeterWH - Thursday, Apr 01, 2004 at 15:43

Thursday, Apr 01, 2004 at 15:43
the tweo radios that you have got would be 27Mhz CB and 476Mhz UHF.
Usually the UHF antenna would be on th roof of your vehicle because it is mainly line of sight or thru a repeater....channels 1thru to 4 respectivelly,and the 27Mhz radio would have the base on the bull bar and a antenna to suit would cast anything from $20 upwards,depending on the typeof base and the cabling.
I would suggest that you getinto your local telephone book and look under two way radio specialists,contact them and find out what yiou require for both radios.
I have a motor home,which I put into it a UHF/27Mhz.
By the way another wayto check them out is to turn the squelch off with them both.
the UHF wont ahve any noise,but the 27 will makwe more racket than a car full of kids.
Good luck with it.

Rural NSW
AnswerID: 52822

Follow Up By: Leroy - Thursday, Apr 01, 2004 at 16:09

Thursday, Apr 01, 2004 at 16:09
the uhf will probably have a duplex button and/or scan buttons also.

FollowupID: 314628

Follow Up By: Dave from Fraser Coast 4WD Club - Thursday, Apr 01, 2004 at 20:42

Thursday, Apr 01, 2004 at 20:42

UHF will make a racket if under squelched!! Many of the newer UHFs just have auto squelching

Repeaters are on channels 1-8 (31-38)

FollowupID: 314660

Reply By: Patroleum - Thursday, Apr 01, 2004 at 19:23

Thursday, Apr 01, 2004 at 19:23
Simple Formula. The UHF set is the one you use and the AM set is in there as a spare wheel chock if you forgot to bring one with you.

Use the UHF

AnswerID: 52865

Reply By: Bitsumishin - Mike A (WA) - Friday, Apr 02, 2004 at 19:01

Friday, Apr 02, 2004 at 19:01
find a mate nearby with a UHF & try both radios, then you'll know which is which. Or if you are not embarrased easily, just broadcast on each and ask if anyone has a copy and what band are you using. Be prepared for some smart ar... replies though
AnswerID: 52974

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