- Original Message -
From: Jeff DePolo
To: Repeater-Builder@yahoogroups.com
Sent: Thursday, July 02, 2009 7:39 AM
Subject: RE: [Repeater-Builder] DB-224 patterns on side of tower.
...that's gain realized due to compression of the elevation pattern.
We're tal
--- On Tue, 6/30/09, tahrens301 wrote:
From: tahrens301
Subject: [Repeater-Builder] DB-224 patterns on side of tower.
To: Repeater-Builder@yahoogroups.com
Date: Tuesday, June 30, 2009, 2:35 PM
Hi Folks,
We are putting up the DB-224 on the side of the tower,
which is one of those large 3 legged
> The gain figures I quoted are dBd reference the dipole
> mounted in place of the DB-224 before the test. The
> Scientific Atlanta turntable was connected to a circular
> strip chart and the amplitude measurements were recorded
> directly to the strip chart which was submitted. The
> turnta
> Jeff,
>
> Do I understand you to then also reject the idea that an
> omnidirectional colinear antenna, top-mounted on a basic
> metal pole, is bogus to claim 6 dBd gain in all directions at
> the same time?
Nope, I didn't say that at all.
> The convention is to measure gain at the horizo
] DB-224 patterns on side of tower.
I'm not trying to pick a fight here, but this seems to defy the laws of
physics. There would have to be nulls that were quite deep elsewhere in
the pattern aside from the four azimuths you cited if those values were
indeed valid.
.
es from to make the extra 3 dB
gain, as it obviously comes from the 3 dB reduction in gain on the back side of
the tower compared to an omni antenna.
73 - Jim W5ZIT
--- On Wed, 7/1/09, Jeff DePolo wrote:
From: Jeff DePolo
Subject: RE: [Repeater-Builder] DB-224 patterns on side of tower.
To
: Jim Brown
To: Repeater-Builder@ yahoogroups. com
Sent: Wednesday, July 01, 2009 6:46 PM
Subject: Re: [Repeater-Builder] DB-224 patterns on side of tower.
Back when we had to submit an antenna pattern in order to get a repeater
license for the ham bands, I mounted four elements of a DB-224 dir
> Their sample pattern when side-mounted on a tower shows 9 dBd
> forward gain and -2 dBd off the back away from the tower,
> again with all elements in a line. That may be getting
> closer to being realistic.
Err...upon closer look (zooming in on the PDF)...it's more like -3 to -4 dBd
off the
...@yahoogroups.com] On Behalf Of Chuck Kelsey
> Sent: Wednesday, July 01, 2009 8:31 PM
> To: Repeater-Builder@yahoogroups.com
> Subject: Re: [Repeater-Builder] DB-224 patterns on side of tower.
>
>
>
> For what it's worth, the pattern shown in the Decibel catalog
>
ssage -
From: "Jeff DePolo"
To:
Sent: Wednesday, July 01, 2009 8:11 PM
Subject: RE: [Repeater-Builder] DB-224 patterns on side of tower.
>> Back when we had to submit an antenna pattern in order to get
>> a repeater license for the ham bands, I mounted four elements
>> o
> Back when we had to submit an antenna pattern in order to get
> a repeater license for the ham bands, I mounted four elements
> of a DB-224 directly on one leg of a Rhon 25 tower and
> mounted the two tower sections on an antenna test pedestal
> and ran the pattern. With the antenna sections
Did you do any others? I'm guessing that this was done on the Decibel
antenna range, maybe?
Chuck
WB2EDV
- Original Message -
From: Jim Brown
To: Repeater-Builder@yahoogroups.com
Sent: Wednesday, July 01, 2009 6:46 PM
Subject: Re: [Repeater-Builder] DB-224 patterns on side of
anything like a water
tower leg, or other massive support...
73,
Paul, AE4KR
- Original Message -
From: Jim Brown
To: Repeater-Builder@yahoogroups.com
Sent: Wednesday, July 01, 2009 4:46 PM
Subject: Re: [Repeater-Builder] DB-224 patterns on side of tower.
Back
, tahrens301 wrote:
From: tahrens301
Subject: [Repeater-Builder] DB-224 patterns on side of tower.
To: Repeater-Builder@yahoogroups.com
Date: Tuesday, June 30, 2009, 2:35 PM
Hi Folks,
We are putting up the DB-224 on the side of the tower,
which
-
>
> *From:* tahrens301 <mailto:tahr...@swtexas.net>
> *To:* Repeater-Builder@yahoogroups.com
> <mailto:Repeater-Builder@yahoogroups.com>
> *Sent:* Tuesday, June 30, 2009 2:35 PM
> *Subject:* [Repeater-Builder] DB-224 patterns on side of tower.
>
>
ttern deficiencies. I can take a few pics if you would like to
see how they are mounted.
Roger W5RDW
Murphy, Texas
DFW area
- Original Message -
From: tahrens301
To: Repeater-Builder@yahoogroups.com
Sent: Tuesday, June 30, 2009 2:35 PM
Subject: [Repeater-Builder] DB-224 patterns on
2009 2:35 PM
Subject: [Repeater-Builder] DB-224 patterns on side of tower.
Hi Folks,
We are putting up the DB-224 on the side of the tower,
which is one of those large 3 legged towers. (like you
see at microwave & telephone sites).
I have the DB-products data sheet on the 224
Hi Folks,
We are putting up the DB-224 on the side of the tower,
which is one of those large 3 legged towers. (like you
see at microwave & telephone sites).
I have the DB-products data sheet on the 224, and it
has some plots for side mounting on the tower.
The plot in question is the 224E (all
18 matches
Mail list logo
