Building a slim jim

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Building a slim jim

Postby kingchristo » Thu May 01, 2014 8:20 am

Hello im looking at building a slim jim from ladder line ones I have seen talk about length for a frequency, this may be abit stupid but im wondering what length I would need for my scanner to work best for picking up the full frequencies of my scanner ive got a EZI-33 XLT thanks people
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Re: Building a slim jim

Postby m0lsx » Thu May 01, 2014 8:28 am

I use a slim jim cut for 2 meters transmission on my scanner & it works fine.
The thing to watch is the type of feedline the slim jim requires as the velocity factor of feedline varies as much as impedance..So get the right type of feedline for the job..I normally use a design which uses cheap 75 ohm ladderline as used by Americans for TV feed.
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Re: Building a slim jim

Postby kingchristo » Thu May 01, 2014 8:30 am

Is yours made from all wire or is it the types that are using copper piping or other type of piping.
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Re: Building a slim jim

Postby m0lsx » Thu May 01, 2014 8:43 am

All of mine are the roll up variety & made totally from coax. They sit rolled up in my tool boxes that sit ready for RAYNET callout & special event use.
All are small enough to easily fit in a pocket & I have used them taped to my 10 meter roach pole, which is how I used it during Jamboree on the air (JOTA.) Hung from a tree. Hung in a window, which was where I used one for the VHF station at the school radio club. I use to run. Taped to a small roach pole attached to old framed back pack for pedestrian mobile operation & blue tacked to a wall for scanner operation in a hotel room.
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Re: Building a slim jim

Postby milly » Thu May 01, 2014 1:52 pm

m0lsx wrote:..I normally use a design which uses cheap 75 ohm ladderline as used by Americans for TV feed.



m0lsx wrote:All of mine are the roll up variety & made totally from coax.


A bit confused by these conflicting statements?
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Re: Building a slim jim

Postby m0lsx » Thu May 01, 2014 2:44 pm

I meant completely from RF feed....On HF I do use Zepps, which use feed line & then radiate from wire on top of the feeder. But on VHF, they are all made from RF feedline, be it 75 or 350 ohm..
The 75 ohm is not ladder line, but balanced feed & the 350 ohm is balanced feed ladder line...That is the 350 ohm has gaps between the feed wires & the 75 ohm is solid plastic.
ng
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