Joining UHF antenna Cable

Submitted: Tuesday, Jul 20, 2004 at 17:06
ThreadID: 14849 Views:8781 Replies:5 FollowUps:4
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Sorry my earlier post was not clear so here goes.
I want to put a join in my UHF antenna cable near the mount on the bullbar so I can completely remove the antenna when not in use. Is it possible to regain full effectiveness of the antenna once a joiner is in place.
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Reply By: Member - Roachie (SA) - Tuesday, Jul 20, 2004 at 17:41

Tuesday, Jul 20, 2004 at 17:41
G'day perf,
I'm just going through this issue at the moment. I'm in a 4x4 club and don't seem to get as good a reception as some of the other club members. They can hear people further away than I can.
My coax has 3 joiners in it......one about 1 foot from the antenna (behind the grille), another one just inside the passenger's footwell (where the cable goes through the firewall) and a 3rd right at the back of the radio (the radio came with about 4" of cable and a male joiner attached).
Don't get me wrong, my radio still works very well, just not quite as well as some other blokes. Also, my antenna is only a 4.5db. It's one of those on a sprung base with about a foot long base and then a screw-on stainless wire with a coil half way up.
I'm not sure whether to get a 6/9db antenna &/or replace the coax and cut out the 1st 2 joins I mentioned above. I guess the 2nd idea would be cheaper to try and may give me better performance; so I'll try that first.
So, to answer your question, you shouldn't have any dramas just putting a joiner in near the grille.
AnswerID: 68684

Follow Up By: Mad Dog (Victoria) - Tuesday, Jul 20, 2004 at 19:15

Tuesday, Jul 20, 2004 at 19:15
Get rid of all the connectors you can Roachie especially if they're the crappy PL type which are not constant impedance and will cause havoc with the transmission line at these freqs.
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Follow Up By: noel h - Tuesday, Jul 20, 2004 at 22:13

Tuesday, Jul 20, 2004 at 22:13
Maaaaate. Go and buy a new lead. The antenna you have is good enough. Unless you need a Wanker big one which is more trouble than its worth.
cheers
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FollowupID: 329254

Reply By: Mad Dog (Victoria) - Tuesday, Jul 20, 2004 at 18:05

Tuesday, Jul 20, 2004 at 18:05
While not ideal one joiner will not introduce much loss if done correctly. If water is allowed to enter the connector capillary action will suck it the full length and it will drip out at the radio end so keep the join under the bonnet out of the rain.
AnswerID: 68692

Follow Up By: Mad Dog (Victoria) - Tuesday, Jul 20, 2004 at 18:11

Tuesday, Jul 20, 2004 at 18:11
Forgot to mention once water enters the coax it will turn nice bright shiny copper into a green mess and then it's only fit for the bin.
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Reply By: Peter 2 - Tuesday, Jul 20, 2004 at 20:16

Tuesday, Jul 20, 2004 at 20:16
Best not to have any joiners as they rarely make a good connection.
the normal coax plugs are not waterproof and as has been stated once water has got in it is stuffed.
If you must have a join put it under the bonnet and wrap it in fresh self amalgamating tape EVERY time it is removed/reconnected.
the best method is to run a new cable from the radio to the antenna base and when the antenna is removed put the cable in waterproof bag under the bonnet.
Peter
1996 Oka Motorhome

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AnswerID: 68714

Reply By: Utemad - Tuesday, Jul 20, 2004 at 21:39

Tuesday, Jul 20, 2004 at 21:39
Best option would be to buy an antenna that is removable. One that can be unscrewed leaving only the base. If height is a problem then GME has a range of antennas that can be screwed into the one base. Depending on your needs at the time. AE4700 series.

Utemad
AnswerID: 68730

Follow Up By: Utemad - Tuesday, Jul 20, 2004 at 21:40

Tuesday, Jul 20, 2004 at 21:40
Should add that if you remove the antenna then you should also remove the microphone from the unit. Stops someone fom accidentally transmitting without the antenna. Could cause damage to your unit.

Utemad
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Reply By: noel h - Tuesday, Jul 20, 2004 at 21:45

Tuesday, Jul 20, 2004 at 21:45
do you need to remove the antenna (or the complete antenna,base and lead if so why)?
because the more joins you have then the more loss you have when it comes to UHF.
AnswerID: 68731

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