Common UHF problems

[taslucas]

Ive got a few questions to ask the more knowledgable:

1. Can the UHF be damaged by using it without an aerial (coaxial rattled loose). If so, is there anyway to test if this has happened?

2. What is the best db aerial for hilly and densly forested areas? Ive heard 3db is best?

3. What is "ground dependant" and is this design the best for a 4wd?

4. My UHF is wired straight to the battery (positive and negative) as this was suggested in the instructions of the UHF so that the unit can be used without having the ignition on. EDIT: is this an ok set up? Is there any downside to this set up?

5. What is the best MHz aerial? Ive seen listings for 477MHz and 27MHz


I did notice the cable had come out of the back once a while ago but im not sure if i used it like that or not.

I tried to use it last weekend and i could hear and talk if the other car was very close (like 15 metres) but not any further away. The other vehicles say that im very distorted.

In open area i could hear the odd bit from the others up to 100 metres away but they couldnt hear nothing from me.....

[Bloodyaussie]

27mhz is AM Lucas and 477 is uhf.........

[taslucas]

sweet, thats one question down. Cheers

[Bloodyaussie]

Never transmit with no aerial attached as it can damage the transender....

[Clunk]

Hilly areas, 3Db is best but not sure about forrestry areas

[Clunk]

not sure if number 4 ia question or just a statement but mine is also wired directly to the battery, with an inline fuse on the positive

[taslucas]

Never transmit with no aerial attached as it can damage the transender....

Can you elaborate on that? Is there anyway to check if this has happened? Can it be repaired?

[taslucas]

not sure if number 4 ia question or just a statement but mine is also wired directly to the battery, with an inline fuse on the positive

oh, sorry, i was just wondering if this set up had any negative affect? I gues not. Should i justr make sure it has good connections to both?

[Bloodyaussie]

Yes it can be repaired but if it is an older system and not worth much then it is not worth doing..

There are specialist shops here that can test it but I dont know what you have down there.... mostly communication specialists.

[Clunk]

oh, sorry, i was just wondering if this set up had any negative affect? I gues not. Should i justr make sure it has good connections to both?

no negative effect and yes make sure all cables have good connections..

with the antenna cable, try and keep it one length with no extra connections as with each connection you get a slight loss in Db............. now where was that thread that ET responded to, which talked about all this