Paul,
This length always leads me to telling Hams that the 17 ft Comet does
not have the 8+ dbd gain the package says. An antenna 44 ft long to get
the 9-10 db gain from a very professional company with years of
experience and now someone is going to make same in 17 ft package.
Doubling the antenna will give 3 db gain so if got one at 20 ft w/6 db
gain and putting a second on at 40 or 44 ft will give 9 db, no problem.
It is doable as you noted.
Of course the guy with the Comet 8 db 17 ft would think putting on 2 at
34 ft would give 16 db, hi.
73, ron, n9ee/r
Ron Wright, N9EE
727-376-6575
MICRO COMPUTER CONCEPTS
Owner 146.64 repeater Tampa Bay, FL
No tone, all are welcome.
On Fri, May 9, 2008 at 10:50 PM, Paul Finch wrote:
Do a Google search for yourself, it's the first result that comes up.
The DB-228 is the same way, it about 44 feet long overall.
Paul
___________________________________
From: Repeater-Builder@ yahoogroups. com [mailto:Repeater-
[EMAIL PROTECTED] ups.com] On Behalf Of Nate Duehr
Sent: Friday, May 09, 2008 12:26 PM
To: Repeater-Builder@ yahoogroups. com
Subject: Re: [Repeater-Builder] Re: antenna question - Dip It and
Scotch Kote and Kry
Paul Finch wrote:
Actually I looked up the Super Stationmaster and and they have one
that's rated at 9 DB at VHF.
dBi or dBd? Very important. "DB" is a useless number without that
third letter when rating antennas. (GRIN)
I'd say generally that what you're describing is not physically
possible. (Unless the thing is enormous.)
The Sinclair SD-218 is 40' long, and rated at 11.5 dBd and has 8
folded-dipole bays. The antenna is taller than my 2 story house.
< http://www.sinclair technologies. com/catalog/ product.aspx? id=1693
<http://www.sinclairtechnologies.com/catalog/product.aspx?id=1693> >
(They also work great. Two of them stacked on an 85' tower with a whole
whopping 5' of vertical separation -- ha -- makes for one hell of a
combined TX / shared RX system for multiple VHF machines at one of our
sites.)
So... there's no way a Super Stationmaster even comes close. The
physics just don't work out.
The much more commonly-seen SD-214 is 20' long and is 8.5 dBd.
< http://www.sinclair technologies. com/catalog/ product.aspx? id=42
<http://www.sinclairtechnologies.com/catalog/product.aspx?id=42> >
Note: You lose 1 dB (dBd) if you get the Heavy-Duty/Low- PIM option.
< http://www.sinclair technologies. com/catalog/ product.aspx? id=2055
<http://www.sinclairtechnologies.com/catalog/product.aspx?id=2055> >
Nate WY0X
<http://www.sinclairtechnologies.com/catalog/product.aspx?id=2055>
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