[600MRG] Pracitical Discussion...

[Kenneth G. Gordon]

What I am hoping folks will discuss here are the practical applications of info such as 
Rudy's most excellent site offers.

Like, what did you do to weather-proof your system? 

What troubles did you run into when you built your system? 

How do you keep the random kids from getting across the RF HV?

What did you do to prevent damage from storms?

How did you implement measurement of, say, RF current?

How did you manage remote control of tuning?

What did you do for lightning protection?

Etc?

For instance, in my case, I am going to have to use some heavy-duty relays at low-RF 
voltage points to switch my loading coil for 160 meters and that for 630 meters into and out 
of the circuit.

According to my calculations, I'll need a 680 uH inductance at the bottom of my vertical to 
resonate it on 630 meters. I need about 38 uH to resonate it on 160 meters now, where it 
gives me, presently, about a 3:1 50 ohm SWR (approximately 150 ohms or so).

I have severely modified an old satellite TV dish-mover to adjust the rather large roller-coil 
(95 uH) which I got out of an old WWII military BC-939 antenna tuner, and will control that 
with an old satellite TV dish-mover controller, which has a numerical digital readout.

The modified dish-mover has built in adjustable limit switches, and runs from 12 VDC. The 
mover itself outputs a square wave as the motor runs and this square-wave causes the 
controller to readout counts-per-turn of the roller-inductor.

Anyway, those are some of the sorts of things I hope we discuss here.

Ken W7EKB

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