Re: How to connect the lamp?


Fred Bloggs wrote:

I am familiar with the propensity for making outrageous claims from your
kind, not impressed, your so-called designs are little more than kit
work, you just don't have it.


In other words you have absolutely no idea how any of it is done.
That doesn't surprise me in the least. Nothing ids 'kit' in Broadcast.
The waveguide calculations are critical, and if done wrong result in
spectacular and very expensive light shows. Of course you would care.
You would blame the manufacturer, the tower company and the high steel
types who assembled it.


The shortest time I ever had to design a circuit, build it and install
the hardware in two cities was a little under 12 hours. I had to have a
working tower light monitor system for our old tower working before
midnight, or buy a $10,000 system from the FAA's approved vendor list.
This also included driving over 100 miles, which took three of those
hours.

A current transformer was used to monitor the tower's lighting
circuit. A 1.024 MHz crystal oscillator was divided by 1024, down to
1000 Hz square wave. The output of the CT was rectified and fed to a
comparator. That was used to gate the 1000 Hz square wave. Then a
simple LP filter cleaned it up into a usable sine wave and an output
level control. This was fed through a spare (third) audio channel in the
Ku band STL between the two sites.

At the new tower site the tone decoder was connected to a indicator
on the master console. The design had the indicator on when the tower
lights were off, but had AC available. When the beacons came on, the
signal was dropped, turing off the indicator. The loss of a single bulb
or beacon on the tower would cause the indicator to stay lit. It was up
and running a little before midnight, and met the FCC and FAA
requirements. They liked the simple and reliable design.


Now show 'ME" a complete circuit and I'll tell you why you are wrong.


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