Twisty Member 182 Member For: 17y 5m 23d Gender: Male Location: Melbourne Posted 02/09/08 10:30 AM Share Posted 02/09/08 10:30 AM Are they the same decibel rating?When it comes to the UHF aerials, the decibel rating determines their range and effectiveness.Check this out to explain the differences...Firstly let's look at Gain - If you look at the diagram below, with the vertical line representing the antenna, the outer circles indicates how the signal is transmitted with various gain antennae. In summary the higher the gain the more direct and pinpoint the signal, thus longer distance but far less 'rollover' effect, consequently reducing performance in hilly areas.The diagram below typically shows what happens to the signal between two vehicles - note how the signal with a 3db gain antenna actually reaches the second vehicle s antenna but the 6db does notIdeally if would be advantageous to change antennas when in flat country and also when in hilly country - This situation is certainly not ideal, so a compromise is the only answer - In summary the best all-round choice is 4.5-6dbHope that helps mate. Link to comment Share on other sites More sharing options...
Cagey Member 36 Member For: 18y 8m 6d Posted 02/09/08 12:09 PM Share Posted 02/09/08 12:09 PM Thanks twisty....makes alot of sense looking at the diagramsboth of my antennas are 4.5 - 6 dbjust did a little drawing of both antennas on the carso effectivly both of these antennas would work exactly the same if they where on the car like in the pic right? if they were a different db rating then it would b a different story Link to comment Share on other sites More sharing options...
Twisty Member 182 Member For: 17y 5m 23d Gender: Male Location: Melbourne Posted 03/09/08 01:20 AM Share Posted 03/09/08 01:20 AM Haha, great artwork!Yeah, they'll have the same effectiveness, if they've got the same DB Gain, and they're mounted the way you've skillfully drawn. haha. Link to comment Share on other sites More sharing options...
Cagey Member 36 Member For: 18y 8m 6d Posted 03/09/08 08:19 AM Share Posted 03/09/08 08:19 AM haha thanks for the complimentsbut seriously that's for the advice and diagrams, made things alot clearer! Link to comment Share on other sites More sharing options...
Cagey Member 36 Member For: 18y 8m 6d Posted 07/09/08 08:01 AM Share Posted 07/09/08 08:01 AM Anyone using a Uniden UH015sxIf so what do you think? Link to comment Share on other sites More sharing options...
Adam Here since the start... Lifetime Members 10,282 Member For: 21y 6m 29d Gender: Male Location: Victoria Posted 07/09/08 08:15 AM Share Posted 07/09/08 08:15 AM Threads merged. Link to comment Share on other sites More sharing options...
BFHOON Donating Members 1,932 Member For: 18y 7m 30d Gender: Male Location: nsw Posted 07/09/08 09:32 AM Share Posted 07/09/08 09:32 AM imo the best mobile antenna is a rfi evelated feed 4.5/6.5 db.they call it a 6.5 but I cant see a 4.5 gaining with just an elevated feed. Link to comment Share on other sites More sharing options...
sexual harrassment panda I see a red door and I want to paint it black Donating Members 5,919 Member For: 15y 29d Gender: Male Location: Far north queensland Posted 07/01/10 08:40 PM Share Posted 07/01/10 08:40 PM ok old thread but I'm getting a uniden uhf/scanner and was wondering if anyone could recommend a small/discreet antenna for me Link to comment Share on other sites More sharing options...
adaze Member 2 Member For: 16y 5m 29d Gender: Male Location: Broken Hill, NSW Posted 22/01/10 10:43 AM Share Posted 22/01/10 10:43 AM (edited) Hey Sideways,I recently got a "Clear Glass Antenna" which is made by Laser Antenna and it works great!Granted it doesn't have the range of a proper external antenna, but it does the job. Edited 22/01/10 10:44 AM by adaze Link to comment Share on other sites More sharing options...
sexual harrassment panda I see a red door and I want to paint it black Donating Members 5,919 Member For: 15y 29d Gender: Male Location: Far north queensland Posted 23/01/10 12:09 AM Share Posted 23/01/10 12:09 AM thanks man looks sweet, but I got and awesome deal of fleabay on a uhf/6db antenna combo Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now