On 27 sep, 15:00, "Bill Ogden" wrote:
I am getting ready to place a choke at the feedpoint of my half sloper,
hoping to lower the noise level.

Question: would the same action help with a normal beam (a 3-element
SteppIR, in this case)? I think there is a balun of some type in the driven
element of the SteppIR, and I do not know how much this rejects noise pickup
on the external shield of the coax. (The coaxes for both antennas run about
50' underground, and then about 60' up the tower.)

Bill - W2WO

Hello Bill,

Assuming a good balun, feeder in symmetry plane of beam and the 50"
under ground, I do not expect much off it.

Also when there would be noise climbing up the feeder (to the beam),
the noise could also use the (metal) mast.

You might place a signal source at your location close the coaxial
feeder. Add some common mode rejection and see whether it works. You
should source ferrite material with the highest impedance at the
working frequency.

Best regards,

Wim
PA3DJS