11m delta loop question

[linearone]

I found a formula that says 1005/freq. So that comes out to 36.94 feet. I guess 2:1 for the rectangle shape would be ok? Feed it from the side for vertical polarization. How do i calculate the 75ohm coax feeder? Just use the vp of the coax and calculate a 1/4 wave?

 

[wjm1129]

I think the length of the 75 ohm coax is about 6 feet.

 

[AudioShockwav]

Just use the vp of the coax and calculate a 1/4 wave?

Yes
There is a good web site

Theory of Full Wave Loops – Practical Antennas

practicalantennas.com

Lots of good stuff about feed points, gain, polarization

73
Jeff





(I wish we had the internet when I was younger)


73
Jeff

 

[linearone]

Yes
There is a good web site

Theory of Full Wave Loops – Practical Antennas

practicalantennas.com

Lots of good stuff about feed points, gain, polarization

73
Jeff





(I wish we had the internet when I was younger)


73
Jeff

Ok so 12.5ft on the tall sides, 6ft on the top and bottom.

 

[linearone]

Whoops.

So 12.33ft+ 12.33ft + 6.165ft + 6.165ft

 

[linearone]

Whoops.

So 12.33ft+ 12.33ft + 6.165ft + 6.165ft

7.5ft of 75 ohm 84% coax as matching section.

 

[BJ radionut]

https://dl5dbm.darc.de/d11m_e.pdf

Delta Loop Antenna Calculator Online

The Delta Loop Antenna Calculator is a valuable tool used in designing and constructing delta loop antennas.

calculatorshub.net

Theory of Full Wave Loops – Practical Antennas

practicalantennas.com

 

[Uncle Ronnie 336]

my plan now is dual co-phased loops fed from the side in vertical pol. all ladderline, 4:1 balun at the window. idk what the SWR will be on the low side of the balun but im pretty sure my tuner (tentec 229) will take care of it

 

[Dr_DX]

You guys do realize that the MACO V2, V3 & V4 are just Delta Loops that use a gamma to match. You can change polarity by the orientation of the antenna.