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You are right about antenna impedance, best S-meter indication & adjusting the series capacitor also by trial & error.
The starting point is Antenna Impedance. Once antenna Resistance & Reactance are known accurately, the length of coax piece & value of series capacitor can be calculated...
Photos of ADS-B Equipment & Setup mentioned in my last post
System Setup with Satellite in-Line Amplifier
[SIZE=1]- - - Updated - - -
The screenshot below shows how the position signals from aircrafts (within 450 km / 250 nautical miles of receiver) are decoded & plotted on google map by...
Hi Dave!
Thanks for sharing the link for drawing of your 2400 MHz Coaxial Collinear antenna.
Nice design. Will give it a try.
The problem I was trying to solve pertains to DIY CoCo made using coaxial cable RG6 vastly used by TV & Satellite installations. This cable and its fittings are...
"Coco" mentioned here has nothing in common (except name) with the food items coco & drink "hot cocoa"
CoCo is nick name/short form of "Coaxial Collinear Antenna", made of multiple ½ λ long (electrical length) pieces of Coaxial Cable. The core & shield of adjuscent pieces are cross connected...
IMPROVING PERFORMANCE OF A COCO BY LOWERING IT's SWR/IMPEDANCE MATCHING
IMPROVING PERFORMANCE OF A COCO BY LOWERING IT's SWR/IMPEDANCE MATCHING
It is well known that a large number of DIY CoCo makers get frustrating results, and only a relatively small number get satisfactory or good results...
WIRE COLLINEAR
I have noted some contradiction in coil dimensions in this drawing of wire collinear by G-7RGQ.
It says the coil consists of 1½ turns of 10 mm dia. The length of wire in coil therefore works out to π x d x 1.5 = 3.14 x 10 x 1.5 = 47mm. Adding 4 mm wire to provide gap between...
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