Seen in Devon this weekend

[thermidorthelobster]

I was in Widecombe-in-the-Moor car park earlier and spotted a lifted grey Y-reg Disco II running very mud-oriented tyres (can't remember which ones now, but they were 235/70s), with a snorkel, Safety Devices roof rack, Safari snorkel, hefty spotlights, plus 2 CB aerials.

It looked good, the wiring for the aerials / spots was very neat, although there were suspiciously few scratches on the paintwork

Was it anybody here?

And why 2 aerials?  :?

[Big Rich]

If I remember this right.  :oops: You use two cb arials so the signal goes futher ahead and behind and less to the side.  8)  Think thats why lorrys use two.

Hope this helps.

Rich

[strapping young lad]

i thought they used two aerials for two different radio sets?

if not and they do use two then how would it affect snr etc?

[muddyweb]

You can use two antennae in parallel to modify the radiation pattern of the your set-up, providing a more 'directional' system.

In most respects, for a mobile set up, I reckon a single antenna is better as you (tend to) get a more uniform radiation pattern giving a better signal in all directions.

In addition, I can't remember off the top of my head what the licence restrictions are on antennae for CB.

[strapping young lad]

ah right i see

makes sense

[Donald the Disco]

You can use twin twigs...........it is the wave length of the twig which must remain at 5/8ths I think.........

twin twigs on a truck alter the radio output to a better front & rear signal,  After all when you are on the motorway you want to talk the wagons in front or behind you not to some turkey on a housing estate...... :lol:

Anyway some bright spark is likely to appear and correct us...... :lol:  :D

[thermidorthelobster]

Is the directional gain in line with the aerials, or at right angles to them?

The Widecombe Disco had one on the left, one on the right.

D

[Niel]

Said smart arse duly appears:

It all depends on seperation distance, across a truck cab/landie the pattern will bias front rear, further apart (don't remember the figures) in line. The biggest problem is co-phasing needs the correct harness (75ohm cables matched lengths connected to 50 ohm to the rig) to work properly. Of course it might have had cb and ham rigs....

Niel. :D

[Donald the Disco]

As I said....................Await the smart arse..............and one shows up........ :lol:  :lol:  :lol:

Cheers Niel