UHF Wiring...is this correct?

Submitted: Thursday, Jul 24, 2003 at 20:40
ThreadID: 6158 Views:8065 Replies:8 FollowUps:2
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Hi, about to wire up a UHF mobile in the 4b. Please let me know if I'm on the right track. I'll use at least 4mm 10 amp wire with positive direct to + on battery and the - grounded in engine bay. I'll put a fuse holder and 1 amp fuse in the + line close to the battery terminal. I'll bring the wiring in through a grommet in the engine bay to the uhf. Is this correct? Any further suggestions?
Thanks in advance,
Will.
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Reply By: chopper - Thursday, Jul 24, 2003 at 20:49

Thursday, Jul 24, 2003 at 20:49
will, that will work fine, but you don't NEED 4mm wire, but if you've got it, it certainly won't hurt!!

One other, take care with your aerial plugs, and try to avoid running the cable near power cables (I know that is hard, but apparently it makes a big difference) I've run mine apart where possible but in some places you just can't
AnswerID: 25841

Reply By: Hilly - Thursday, Jul 24, 2003 at 21:15

Thursday, Jul 24, 2003 at 21:15
Will,

I fitted a GME TX4200 to my mates 100 series this afternoon and the only suggestion that I would offer you is to also wire the negative cable direct to the negative terminal of your battery rather than to an earth point. This gives you the advantage of using the radio without the keys in the ignition and turned to acc or on. The amount of power used by a cb is minimal and is pretty unlikely to lead you to a flat battery situation unless you were to leave it on for a few days without starting the motor of course. Run your antennae coax in through the same hole in the grommet and chuck a little silicon around the hole once you've set every thing in position. A couple of cable ties to prevent rubbing (as I've learned by mistake before now) and Bob's your uncle.

Enjoy
AnswerID: 25845

Follow Up By: Luke - Friday, Jul 25, 2003 at 00:19

Friday, Jul 25, 2003 at 00:19
CB will still work if the negative line is wired to the chassis and positive to battery the ignition switched off.

The chassis is earthed to the battery permanently regardless of whether or not the ignition is on........
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FollowupID: 17554

Follow Up By: Hilly - Friday, Jul 25, 2003 at 20:55

Friday, Jul 25, 2003 at 20:55
Doh!!! I sit corrected ladies, gentlemen et al. I had my TX3400 fitted by the pro's today to my shiny new 4.2l turbo diesel Patrol, ( I know you guys don't give a toss but I just liking hearing the words and I read my typing back to check it...*LOL* ), I was happy to play around with my mates old 100 series but only the best for my baby.... at least till I pass 1000 clicks I'm guessing, and he concured with all of the above,..... and below. Pos to batt, neg to earth as close as possible to the unit and a short low dbA gain antennae for hilly country and a higher dbA gain for on the flats.

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FollowupID: 17615

Reply By: Eric - Thursday, Jul 24, 2003 at 21:37

Thursday, Jul 24, 2003 at 21:37
Will.
You are correct to connect the negative to the body, preferably close to the radio.
Try to run the positive close to the inner gaurd as far as possible from the alternator to reduce the interferance. If you want a top job run the coax through the inner gaurd above a wheel and out under the front panel so there is metal between the coax and the motor, this will reduce interferance on weak signals. Eric.
AnswerID: 25849

Reply By: Voxson (Adelaide) - Thursday, Jul 24, 2003 at 22:56

Thursday, Jul 24, 2003 at 22:56
And put the antenna as high as you can.... on the gutter preferably......bull bars are ok but a little low..._____________________________________________

_____________________________________________
AnswerID: 25860

Reply By: Luke - Friday, Jul 25, 2003 at 00:21

Friday, Jul 25, 2003 at 00:21
And unless you are able to mount the antenna on the middle of the roof of the vehicle - consider a ground plane independant antenna. Especially if you are going for a bull bar mounted antenna.....
AnswerID: 25864

Reply By: brett - Friday, Jul 25, 2003 at 01:15

Friday, Jul 25, 2003 at 01:15
1 amp fuse might be a bit on the light side. I'd use a 2 or 2.5 amp, you'll probably find the radio pulling over 1 amp on transmit.
AnswerID: 25869

Reply By: Uncle Bob - Friday, Jul 25, 2003 at 08:03

Friday, Jul 25, 2003 at 08:03
I have an accessory plug on a second wire for use in Car2 and it works fine. Wiring in Car1 is direct to battery and earth to body. Check the power draw on transmit - that's when the 1 amp fuse may be insufficient. Sitting idle/receiving it will be fine but not transmitting. Have a look at your manual. Mine draws 1.4amps - it's a GME TX 4400. This also means a 10 amp wire is overkill and harder to push through a tight gap! The manual also gives wiring details for installing to ignition switch accessories circuit which also suggests it would work fine there too. Good luck! Hello to my nephew who also offered advice.
AnswerID: 25877

Reply By: Will - Saturday, Jul 26, 2003 at 01:37

Saturday, Jul 26, 2003 at 01:37
Thanks guys, damn excellent. Fitted all well and good today. Tested and A ok.

Beauty,
Will.
AnswerID: 25964

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