Dual-Band roll up J pole

[k6cpo]

Does anyone have a source for plans to build a dual band (2m & 440) roll up J Pole from ladder line? I've looked on line and all I can seem to find are plans for 2 meter antennas only.

 

[15plus1]

http://www.work-sat.com/Antennas_files/FONG-DBJ1.pdf



http://www.arrl.org/files/file/Public Service/TrainingModules/jpole-dual-band.pdf

 

[fishon]

You may already know. But you can buy the Ed fong DBJ-2 on eBay for 30 bucks. Comes with adapters etc and coax all tuned up.


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[k6cpo]

http://www.work-sat.com/Antennas_files/FONG-DBJ1.pdf

http://www.arrl.org/files/file/Public Service/TrainingModules/jpole-dual-band.pdf

I appreciate that you put up a couple of links, but I wonder if you missed where I said "ladder line" in my original post.

 

[15plus1]

You are right. I missed that. Shame on me !

 

[ab5r]

Hmmmm? I have built one using the old TV lead-in, but have not ever seen one for 400 ohm ladder line. I am not sure what the TV line was, but certainly not 50 ohms. Maybe, same measurements and a little tweaking would work, who knows.

Good luck.
Jerry

 

[cmdrwill]

TV flat 'twin lead' is 300 ohm.

IIRC the bigger ladder line is 450 ohms.

 

[fishon]

I think this is what your looking for...
Slim Jim / J Pole Antenna Calculator

 

[fishon]

Nevermind my previous post... I need to read better. The link provide is only 2 meter, not dual band.

 

[popnokick]

Slim Jim Info

 

[K5MPH]

I made one of these years ago out of 300 ohm twin lead tv wire and solder a BNC connector and pig tail on it,i keep it rolled up in my backpack......

 

[Aero125]

You may already know. But you can buy the Ed fong DBJ-2 on eBay for 30 bucks. Comes with adapters etc and coax all tuned up.

I used the Ed Fong roll-up many times and is a great value. Performs great on the antenna analyzer - spot on! He ships it with adapters to use it on both male/female SMA radios and BNC, plus an extra BNC extension coax.