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 <[email protected]> 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
