If the radials have a good chance be being submerged in fresh water, I would
consider elevating the radials.
Had an experience here where my 40 radials on each of my 4 square verticals
were often times below the water level and radiation efficiency dropped like a
rock. Great receive performance but transmit signal was poor (think boiling the
water). When I raised about 20 radials out of the water and disconnected the
ones now trapped in mud, etc. the 4 square started to play well.
Regards,
Mark, K1RX
> On Mar 22, 2021, at 9:54 AM, Wes <wes_n7ws@triconet.org> wrote:
>
> What's the perceived problem with the cable being submerged?
>
> Wes N7WS
>
>> On 3/21/2021 1:25 PM, Carl Braun wrote:
>> Hello Topbanders
>>
>> I am currently awaiting the snow to melt here in the Northwoods of Wisconsin
>> before starting the construction of my low band vertical array. My
>> verticals will be mounted in a low ground area near a lake and the area
>> tends to get wet and sometimes floods in the early spring. Water levels
>> could reach 6" to 12" above ground. My concerns relate to the hardline
>> coaxial cable that will run from my lighting arrestor panel at the outside
>> of my shack to the center of the two element vertical array which is 250'
>> away. I will be using 1 5/8" hardline that I was able to snag for a very
>> good deal but am concerned about having the cable lying on the ground and
>> possible become submerged should we get significant rain with the snow melt.
>>
>> My plan is to elevate the feedline approximately 24" above the ground using
>> old sections of Rohn 25 tower spaced every 10' or so. Each vertically
>> mounted 5' chunk of Rohn 25 will be buried 2' into the ground have a 3' 2x6
>> board laying horizontally across the tower that would act as a coaxial
>> "shelf" that will keep the hardline out of the water and prevent any
>> significant drooping between these Rohn support sections.
>>
>> My question for the forum is related to the fact that I will have an
>> elevated coaxial feedline with two ground mounted vertical antennas. I plan
>> to use an UNUN or similar line isolator/choke that would keep the hardline
>> from becoming a extra radial. Any thoughts from the forum on this set up?
>> Any extra precautions I should take to keep return currents from flowing on
>> the feedline?
>>
>> Thanks in advance for any suggestions.
>>
>> Carl W9LF
>>
>> _________________
>> Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
>
>
> _________________
> Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
_________________
Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
|