I am looking to at making another Vert 40m 1/4w on another 8m fibre glass pole Like the first one so got pair and set them up as co phased with the delay loop again both will have 9:1 Ununs.
Now found good page to work out lengths required for the feeder coax,s and the delay loop coax(Phasing line) and the chap whom built his own version
The 71-degree phasing line should be: 18.264 ft or 5.567 m.
The 71-degree phasing line is 90 degrees at 8.886 Mhz.
What I don;‘t quite understand what is difference between 71’ phasing line and 71’ phasing at 90’
OK its out of phase of 90’ makes difference to coax lengths fair enough,
But what effect does it have on the antenna system.
Am looking at doing the christman phase version switch able BUT extra switch to make it co phase with out the phase loop
Plus could i use RG6 75ohm in the phase loop and the T84’ lines but then RG8 mini from rig to the box of tricks with switches etc.
Whole idea is to use from home, sota and in the field, still being fully portable antennas.
Did start with idea of three el half yagi but distance between the three els is 8.8m each totaling 17.6m at least with this system i can set to how I want to favour one direction and its reverse direction or just go plain side ways and null out other two.
Right thanks again folks
What A wallie I am just noted its not at 90’ length in m but in Mhz DOHHHHHH
Put ya glasses on Karl