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Posted by hoggdoc | Aug 31, 2014 @ 11:34 AM | 1,407 Views
Good Morning All,

Well Bruce Simpson has done it again, caused me to think! See YouTube:

DIY FPV, RG402 versus RG316 coax cables (2 min 58 sec)


Being a HAM Radio Licensee for over 45 years now, Advanced Class US License, I am accustomed to dealing with frequencies from 3.5 mhz to 432 mhz.

However, after entering the world of RC flying machines back in early 2013 I found myself staring at microwave frequencies from 2.4 GHz to is high as 5.8 GHz.

Normally, this would not be an issue but when you factor in First Person View (FPV) operations you're now looking at antenna configurations and their feed lines.

I had been thinking about this for some time but Bruce's post this morning really got me to look into it. As most of you know the higher you go in frequency the more inefficient power transmission becomes.

What does this mean? Well, every inch of additional coax you add from your RF source to the actual antenna can dramatically affect the overall performance of your ground station (GS). Lets look at a typical FPV configuration;

A 2.4 gHz radio system (TX) for controlling the flight of your aircraft, the brand is not important to this discussion, however your location may be. Video from your aircraft is being transmitted by a Video Transmitter (VTX). On the ground the two most common monitoring solutions are personal video goggles, or a monitor of some kind.

Both of these video display methods require a video receiver (VRX) that captures the signal...Continue Reading