OK, thanks Jeff. That could well be.
I'm aware that higher gain figures on an omni antenna result in a narrower
vertical beam width, so maybe the stations that aren't getting in as well as
I'm expecting are "under" the optimal antenna beamwidth/pattern.
Or am I just trying to be too cerebral about all this?
Mark - N9WYS
-Original Message-
From: Repeater-Builder@yahoogroups.com On Behalf Of Jeff Kincaid
Sent: Saturday, June 07, 2008 11:47 AM
To: Repeater-Builder@yahoogroups.com
Subject: [Repeater-Builder] Re: antenna suggestions for 440mhz
Maybe you're already hearing as well as you're going to at that site.
A given user signal is only going to be so strong compared to the
noise level no matter what you do.
Jeff
--- In Repeater-Builder@yahoogroups.com, "n9wys" <[EMAIL PROTECTED]> wrote:
>
> In fear of moving off topic... I'd like to ask how one can determine the
> electrical downtilt of an antenna?
>
> I just put into service a RSF/Celwave Super StationmasterR Model 10017-6
> that is designed for 925-960 MHz on my 927.5250 repeater. The added gain
> factor of the antenna (an additional 4dBd over what was previously
in place
> - a Decibel DB586-Y) does not seem to benefit the receive (at 902
MHz). I
> gained what seems like a little extra receive range, but not equal
to what I
> seem to have gained in transmit coverage.
>
> This discussion thread leads me to wonder if maybe some electrical
downtilt
> may be affecting the receive frequency? Is this possible? Antennas
are not
> my strong point. ;-)
>
> Thanks,
> Mark - N9WYS
>
> -Original Message-
> From: Repeater-Builder@yahoogroups.com
> [mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED]
> Sent: Friday, June 06, 2008 11:19 PM
> To: Repeater-Builder@yahoogroups.com
> Subject: Re: [Repeater-Builder] Re: antenna suggestions for 440mhz
>
> At 6/6/2008 19:22, you wrote:
>
> >The series-fed types (usually fiberglass at these frequencies) *will*
> >tilt their patterns when moving away from their design frequency.
> >
> >Laryn K8TVZ
>
> The good news is that the pattern tilts down when used at
frequencies below
> the design frequency. The big question is by how much. Would be
easy to
> calculate in NECWin if I could only get a good NEC model for the
coaxial
> colinear array. I'm not quite expert enough in NEC to figure out
how to
> create that model.
>
> Bob NO6B
>
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