More antenna q's

[Newb-lite]

Hey guys

When using a neotel antenna (like the one from poynting), How much would you lose on cable length. for example : with a 10 m cable you get 75 rssi ... how much would that decrease when you have a 20 meter cable.

I need to extend my cable pretty far to get a decent signal , and sofar the signal is strong with a 10 meter cable. If i add another 10 meters ... how much will i lose?

 

[Sselmrah]

Won't the guys at poynting be able to help you?

 

[Newb-lite]

they speak in db's and amps and all things i dont understand hehe ...

i know that low rssi is good ... and thats about all i know ... aside from that ... im toast.

i was hoping someone here knows or has tested it , so i could get the answer in dumb terms that i understand.

 

[SideWinder]

Newb-lite,

Quick explenation, from memory, every 3 dB loss means your signal is halved, or 3 dB gain, you doubled the signal.

Look on your cable outer sheath, it will say, RG-XXU like RG-48U, if you used plain old cheap co-ax cable left over from the radio (CB) days. Google your cable's spec, and get the loss per 100 ft (maybe it's in meters these days), then calculate back to your intended distance. You should also add the dB loss per connector, two (one on each end!). My guess is if you go an extra 10m of cable, the extra cable loss will not matter, provided you get at least a 1-2 db gain in signal. All radio type signals don't like trees and other foreign objects, so a 10m height, when you can get it via a tall building, chimney etc, is always good. Like the Yanks say, "These no substitute for Cubic inches", same applies for radio signals!
Hope this helps.

 

[Newb-lite]

shot thanx alot Side.

I mounted my antenna in a different place , so that an extension wont be necessary. Thus i have alot less loss , and got my rssi to 75 ... it seems to be relatively decent.