Don't assume that antenna gain is the only thing that
effects range. Antenna height, size and length of
feedline, quality of antenna and how it is mounted and
duplexer quality and tuning all effect range as well
as transmitter power and overall receiver sensitivity.
High RF enviroments can also degrade receiver
performance. Take a look at your repeater as a
system, looking at the quality of all of the devices
as well as the quality of the installation. One
poorly installed connector can eliminate all the
bennifits from everything else being correct.
Paul, kb0wlc
--- ian wells <[EMAIL PROTECTED]> wrote:
> Hi guys .I am sorry i haven't returned any messages
> as my internet
> email sever has stuffed up and i haven't received
> any messages for 2
> days or more .it is just i checked up on the builder
> website to see
> the messages i have missed.Thanks to all that
> replied .The db
> comparrison is being asked as i have 6db antennas on
> each of my
> 470meg repeaters and they aren't getting any real
> distance over flat
> country .we had 12 db coaxial antennas on our local
> uhf repeater and
> then changed them to what was called coppercore
> antenas and we made a
> huge difference to our long distance coverage .The
> range of the 6db
> isn't bad but we wanted to pick up another 20-50kms
> at least and
> installing linears on the site wont benifit as it
> wont improve rx
> range without rx masthead amps so the better
> sugestion was to install
> higher gain antenas .the sites would be able to be
> upgraded to 12 db
> antenas if we can find a supplier .the highest we
> have found is 9db .
> but i will certainly take all sugestions into
> consideration.thank you
>
> Thank you
> Ian Wells
> Kerinvale Comaudio
> mail service 1017,
> Biloela,4715.
> www.kerinvalecomaudio.com.au
> 1-email- [EMAIL PROTECTED]
> 2-email- [EMAIL PROTECTED]
> 3-email- [EMAIL PROTECTED]
>
>
>
>
>
>
> Yahoo! Groups Links
>
>
> [EMAIL PROTECTED]
>
>
>
>
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