Can anyone model a CoCo for me.


#1

I built the one in the ARRL QST which is an 8 elem with a 69mm bare stub on top.

Wonder if anyone can model the antenna


#2

Just telling “ARRL QST” is not enough.
Please post more details with sketches, or post link to web page where you found it.


#3

Sorry thought about that. Here is the link to the article, I used the same Coax as his.

arrl.org/files/file/QST/This … 013QST.pdf


#4

The pdf linked above says bare whip is 4.5" which is 114 mm, while you said the bare whip is 69 mm. Which whip length you want in simulation?


#5

[quote=“abcd567”]

thought it was 69, didn’t do the calculations, its the 4.5 or 114mm
I saw your calculations of the COCO with 8 elem wondered what the 1/2 way whip does. I have mine going to 25ft of RG6 to the room. I dont have that 90
elbow he did either just a straight connection so that leaves 3db stilll in :slight_smile:, have had it up over a year now


#6

THE COCO

.

THE SIMULATION
8-Element+114 mm Whip - Free Space


#7

8-Element + 114 mm Whip - 7 Meters Above Ground


#8

Thanks a to, kinda looks like what I am seeing :slight_smile:. And Im 7 meters above ground :slight_smile: I live in the Puget Sound area and with mountains on both sides, pretty well mimics whats going on. Appreciate it. For homemade Im pretty happy.

Dont think I could do much better with cantenna. Maybe flightaware antenna but not worth the money for improvement :slight_smile: