[K3PZN-List] Subject antennas on RV's

[John Stephens]

Kerri,

I had the same question a a couple of months back.  So to answer the
question, I contacted Dr. Ed Fong who had recently given a skype
presentation to the CARA club on his Dual Band J-Pole Antennas.  (By the
way, it was VERY interesting and CCARC should do the same!).  He actually
has a patent on his J-Pole design.  His website is
http://edsantennas.weebly.com.

His response was that it isn't the coax you need to be concerned with, it's
the antennas.  They will resonate between themselves.  In order to prevent
the antennas from resonating, 'in theory' (his words) they should be placed
at least 1 wavelength apart from each other.  For example, if you were
setting up 2M antennas they should be placed no closer than 2 meters
apart.  There are some things you can do to mount them closer, like offset
the height, but the physics and math are not trivial. Antenna for differing
bands can be placed closer together, say a couple of feet, without any
significant interference.

Hope this helps.

73 de KC3FDL / John


--------------------------------------------------------
John L. Stephens // KC3FDL
KC3FDL at gmail.com
Latitude: 39.4927 Longitude: -76.8894
MHGL: FM19nm

On Wed, Jan 27, 2016 at 10:50 PM, Kerri Wright <kb3vwk at gmail.com> wrote:

> Is possible to run two vertical antennas at the same time and location
> with out harmful feedback on coaxial line.  If so how defeat that problem?
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