[TowerTalk] Fair rite materials for choke baluns

[jimlux]

On 7/5/16 9:23 AM, Jim Brown wrote:
> On Tue,7/5/2016 7:34 AM, Jim Thomson wrote:
>> IF your sloping  half wave dipole is  UN balanced...then why insert a
>> CMC  at the feed point at all ??
>> I would dump the CMC at the feedpoint, then perhaps  use a CMC  way
>> downstream , like just
>> before the coax meets the tower..or at the base of the tower..or both.
>
> Nope! The first choke should ALWAYS be at the feedpoint. Additional
> chokes farther down the line can be used to prevent current induced on
> the feedline from causing grief in the shack (like with your rack full
> of un-necessary audio processing gear). :)
>

I can conceive of situations where putting the choke somewhere down the 
line might be ok or desirable (from a mechanical standpoint).  Maybe not 
realistic or practical situations.  But if you had a 40 m sloping dipole 
that's 20 m long, and your choke were at, say, 2 meters, and the coax 
from dipole to choke were at right angles to the antenna, I think it 
would work just about as well.



On the other hand, and getting to the "practical" aspect putting it  at 
he feedpoint, the mass is better supported by the antenna itself.