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- Thread starter andre364
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I am getting county and basically every other kind of chatter except any P25 system... i wonder is there is an issue here? or if its our user error? some programing that I and maybe you don't have correct to allow us to hear these P25 systems? That is the main reason I spent the extra money and went with this scanner .. to get the P25 system .. so far i can't get a P25 system in...

The formula for range based on elevation is simple high school geometry:

R-squared (the radius of the earth) plus r-squared (the range) equals quantity (R+H)-squared (where "H" is the height above the earth. Solving for r (the range):

range = square-root of (2HR + H-squared)

Since normally "H" is insignificant compared to 2R, we can ignore the "H-squared" term.

So range = square-root of (2HR)

All variables are in miles, and in case you've forgotten, R (the radius of the earth) is about 4000 miles.

So, for an elevation of two miles, the range is about 125 miles.

If you want to listen to airline traffic, that's usually up there about 7 miles, and for that the range is about 235 miles.

Of course, if you happen to be in another airplane at (say) 10,000 feet, then the range to hear airliners (all other things being equal, which they are not) is the sum of the two examples above, or about 360 miles.

I say all this because as a pilot, I think the 50-mile limit is WOEFULLY inadequate. A 200 mile limit would be adequate for ground-based stations.

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I say all this because as a pilot, I think the 50-mile limit is WOEFULLY inadequate. A 200 mile limit would be adequate for ground-based stations.

Create a favorites list, set the "Location Control" to "NO" for unlimited range limit on those frequencies.

For a better understanding of Home Patrol's range settings, check here:

How it Works: Location, Location, Location

.

That's a work-around. With the BCD996XT and FreeScan, I reset all the ATC frequencies to have a range of 125 miles (the max, as I recall). With the BCD536HP and Sentinel, I'm setting all the tower ranges to 100 miles, the approach/departure ranges to 150, and the ARTCC ranges to 200. However, I've only had the BCD536HP for a day, so I'm not sure if those values will "take".Create a favorites list, set the "Location Control" to "NO" for unlimited range limit on those frequencies.

For a better understanding of Home Patrol's range settings, check here:

How it Works: Location, Location, Location

.

Of course you are correct; the "home" range (more correctly called "Error Of Position") doesn't need to have that range of values. In fact, the documentation would be best served by using different terms for the two values.

I've seen range > 400 in the database.

That's a work-around. With the BCD996XT and FreeScan, I reset all the ATC frequencies to have a range of 125 miles (the max, as I recall). With the BCD536HP and Sentinel, I'm setting all the tower ranges to 100 miles, the approach/departure ranges to 150, and the ARTCC ranges to 200. However, I've only had the BCD536HP for a day, so I'm not sure if those values will "take".

Of course you are correct; the "home" range (more correctly called "Error Of Position") doesn't need to have that range of values. In fact, the documentation would be best served by using different terms for the two values.

Max range setting is 6000 miles.

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