I have an OB16-3 at 73 feet and an OB2-40 at 83 feet ... both have been
up since 2008. Shortly after I installed them I ran pattern profiles of
both antennas with the help of K9RX, who back then lived about 30 miles
away from me line of sight (we both lived on high ground with lower
ground between us). The pattern profiles matched almost exactly the
EZNEC+ plots I had been given by DF2BO, as well as the EZNEC+ plots I
ran myself using physical measurements of the antennas I made before I
raised them. The SWR plots were as expected as well.
The OB2-40 does, of course, include decoupling stubs specifically
designed to minimize interaction between the two antennas on 15m, and as
best I can tell they do the job adequately.
73,
Dave AB7E
On 9/29/2015 12:47 PM, Bill via TowerTalk wrote:
Anyone out there using an Optibeam 16-3 tribander in close proximity to
either an M2 40 4MLLDD or an Optibeam 40 meter Yagi? By close proximity I
mean around 10 feet.
Any interactions noticed, especially 15M resulting in SWR and gain issues.
If so, were you able to resolve them, and how? Any comments would be
appreciated.
Bill K4XS/KH7XS
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