Joe,
dBd is "gain over a dipole".
"Real gain", as you call it, has no meaning. Each person defines "real
gain" in their own terms.
For horizontal antennas, you would ADD approximately 7 - 7.5 dB to the dBd
figure to get dBi, the gain over an isotropic source at the same height.
There is an excellent discussion on this subject in the Force12 catalog
which is downloadable from their website: http://www.force12inc.com/
see: http://force12inc.com/F12-ant-specs-r31.htm
Bill, N3RR
-----Original Message-----
From: owner-towertalk@contesting.com
[mailto:owner-towertalk@contesting.com]On Behalf Of k0bx@qsl.net
Sent: Friday, July 13, 2001 3:02 PM
To: towertalk@contesting.com
Subject: [TowerTalk] Tennadyne T7 DB Gain Question
I am looking to replace my Hygain DB10/15 Dualband beam with a
Tennadyne T7 18-33 MHZ log. It would be located under my Hygain
204BA (20 Meter Monobander).
On the Tennadyne website it give the gain figure as
"6.2 dBd"? I am not sure what dBd is? Should I subtract 3 from
the figure to get the real DB gain?
Anyone have this antenna and have a comment about it?
Thanks
Joe K0BX
k0bx@qsl.net
http://www.qsl.net/k0bx
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