[TowerTalk] 80 Meter beam

[Jim Brown]

On Fri,3/31/2017 5:00 AM, Martin Pelt wrote:
> I am putting a 80 meter 2 element inverted vee beam up. It will be at 120
> feet with 39 foot boom.
>
> I have 2 questions dealing with switching from phone to cw without lowering
> elements and using jumpers.

I have a 2-element flat Yagi for 80/75 at 140 ft. It consists of two 
wure dipoles strung between trees, fed with low loss RG11. I retune the 
antenna from CW to SSB by switching in sections of line in the shack on 
the dipole that is the reflector. My design is based on a 2-part NCJ 
piece by W6AM, who rigged two wires, fed them with a half wave of open 
wire line or twin lead, and switched in L or C in a tuning enclosure at 
ground level. In my implementation, the L and C are provided by those 
lengths of coax acting as open and shorted stubs.

I strongly agree with the advice by others that you MUST model whatever 
you plan to do.

73, Jim K9YC