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s hardware <dg8fz @ww $901281dg8fz #0 DDDF-CATVI-surce-indicator a new application 4 the Double Ducky Direction Finder : to indicate that a catvi-sinal is caused by the installation under test, you may use the DDDF ( WA2ANU QST July 1981 ) as phase modulator. catv--->--mod.DDDF->--installation under test - - -> catvi - > - FM-Handy the schematic diagram of the mod. DDDF circuit : D1 catv->--560pF-*-!>!-*-560pF-----------*->-installation under test ! L1 ! ! ! ! ! gnd ! NF-squarewave ! ! ! generator ! L2 ! >-4.7uF--L3--*-!<!-*---560pF-lamda/2-+ D2 D1,D2 PIN-Diodes HP5082-3077 L1-3 UHF-chokes 73 de karl dg8fz @ db0sao 28.jan.1990 ***end

 

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