[TowerTalk] Decoupling feedlines from tower

[Joe Subich, W4TV]

On 2021-10-08 3:17 AM, w7xu at w7xu.com wrote:
> I suppose I could patch in short sections of flexible coax with 
> associated chokes suitable for 136 kHz, but I wonder if there is
> another way to accomplish the goal.

The chokes would be excessively large for 136 KHz.  They most likely
need to be resonant (parallel tank) and are only applicable if the
tower is base insulated.

The far easier solution is to skirt the tower (making it a folded
monopole).  However, that only works if the tower sides are "clean"
at least for a substantial portion of its height.

73,

    ... Joe, W4TV


On 2021-10-08 3:17 AM, w7xu at w7xu.com wrote:
> I have a tower that I'd like to use as a vertical radiator on 136 kHz, 
> but I am uncertain as to how to decouple the feedlines that supply the 
> antennas already on the tower. For the most part, the feedlines range 
> from 7/8" to 1-1/4" Heliax.
> 
> I suppose I could patch in short sections of flexible coax with 
> associated chokes suitable for 136 kHz, but I wonder if there is another 
> way to accomplish the goal.
> 
> Thanks.
> 
> 73, Arliss  W7XU