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3 Hour Shut-down Rule?

All my sites for my main employer have internet and a phone line. If something gets out of whack, there are two ways for the remote to "yell" at me :) .
 
I am the last ditch 3 hour shut down option for some stations. One chain has a list of their stations that I am within 3 hours of and if they need an emergency shut down and the remote control fails to respond, I hit the road. That has never happened, but it is a formal part of the compliance plan.
 
A silence sensor with a 170 minute delay is one easy solution. If necessary, you kill the audio feed. Once the audio is terminated, 3 hrs -10 mins later, the sensor turns the transmitter off. A DTMF decoder hung on the line is also a good backup, but should not be used without a silence sensor since the program line could be cut rendering the decoder ineffective.
 
I have the STL squelch relay hooked up to the interlock of the transmitters that allows it. Turn off the STL transmitter and the main transmitter goes off. But this would be more for positive control of the transmitter I suppose. I don't really have a transmitter that's longer than a three hour drive away, and all of them have some kind of dial up remote control.

Also, there's a little noticed rule that I was informed of the last time we got a visit from the FCC. That is, instructions posted at the control point detailing how to shut off the transmitter. None of the stations had it at the time, but they all do now.
 
I was just wondering about "instructions"....It seems that many stations do not have instructions posted for their operators, or the ops just don't know how to do anything outside of their day-to-day routine.
Good job.
 
I'm wondering when the 3 hour clock starts|?|... is it when the operator becomes aware of the problem|?|... is it when the auto dialer calls|?|

One broadcaster has 24 hour Network Operations Center and they call their transmitters 3~4 times per day with about 8 hours between calls. If they called every three hours (8 times per day) would that make them more 'legal' than every 8 hours?
 
Clock starts the instant the problem occurs. It's up to the licensee to have a method to make sure the shutdown happens whether automatically or by human intervention. The safest way is to set up a system that immediately sets off an alarm (where somebody can be aware of it) when anything goes out of parameter.
 
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