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Air Traffic Monitoring => Listener Forum => Topic started by: VK2GEL on June 02, 2010, 08:56:41 AM

Title: Slim Jim antenna 300 ohm ribbon design
Post by: VK2GEL on June 02, 2010, 08:56:41 AM

Gday could someone please post dimensions for a Slim Jim antenna centred on 127MHz, to be made from 300 ohm TV ribbon?

Thanks.

Title: Re: Slim Jim antenna 300 ohm ribbon design
Post by: verbatim on June 06, 2010, 07:44:15 PM

hi

check this http://www.para.org.ph/membersarticles/DU1ANV/Slim%20Jim.pdf

for 127 MHz centered:

L1 = 168.3 cms
L2 = 56.1 cms
Gap = 1 inch
L3 = the rest


regards

Title: Re: Slim Jim antenna 300 ohm ribbon design
Post by: VK2GEL on June 07, 2010, 02:05:59 AM

http://www.m0ukd.com/Calculators/Slim_Jim/index.php

Gracias