• Effective immediately we will be deleting, without notice, any negative threads or posts that deal with the use of encryption and streaming of scanner audio.

    We've noticed a huge increase in rants and negative posts that revolve around agencies going to encryption due to the broadcasting of scanner audio on the internet. It's now worn out and continues to be the same recycled rants. These rants hijack the threads and derail the conversation. They no longer have a place anywhere on this forum other than in the designated threads in the Rants forum in the Tavern.

    If you violate these guidelines your post will be deleted without notice and an infraction will be issued. We are not against discussion of this issue. You just need to do it in the right place. For example:

FCC ULS question...

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OH/WV DB Admin
Database Admin
Dec 5, 2006
Carroll Co OH / EN90LN
btritch said:
Can anyone tell me what the difference in the output power and Maximum ERP power on a frequency? Just curious! Thanks!
Well, at least in part it has to do with (a) the maximum transmitter power and (b) the maximum Effective Radiated Power - i.e. after it goes from Transmitter, through coax/hardline and other devices, finally out to the antenna (with the antenna having possible gain).

Obviously if you hook up a 50 watt transmitter to a 0 gain antenna and transmit, you are going to see less than 50 watts ERP. If you hook up a 50 watt transmitter to a 20 db yagi, you are going have way more than 50 watts ERP.

So I think the ERP value is after you take into consideration the transmitter power, any losses induced by feedlines and other devices you might run it throguh, and the potential gain of the antenna being used... notwithstanding other factors I may have omitted.



Premium Subscriber
Nov 27, 2006
Paragould/Greene County AR
So the ERP is the actual transmitt power they're getting out in the air then.. Good, That's what I wanted to know, I didn't know what the difference was...
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