Power 1 Watt to the antenna
Antenna Gain: 0
Antenna Height above ground: 30 feet
otherwise, a gain of 0 is not very useful.
Yes LOL! Antenna gain: 0 dB
"0 dB" with respect to what reference?
Isotropic
I ran another plot at 25 milliwatts for 60 dBuV with the same antenna height and location. The contour easily covered 45 homes. However I am certain that even with the same parameters Part 15 Rules would be violated.
So what's the radius (approximately) of that circle - there doesn't appear to be a scale on the map.
To the tip of the lobe heading east 1750 feet.
At 25 milliwatts about 650 feet.
At 100 miliwatts about 1,000 feet.
Isotropic: Do you mean a vertical piece of wire, metal such as copper, aluminum? Why such small range less than ¼ to ½ mile in Full Quieting Stereo? 310 mW easily covers 0.8 miles with full quieting and doesn't start to fence post till 0.9 miles. This is a 5 Ft piece of wire in a house next to a bay window. That is only about 6 Ft off ground. Are you counting the ground itself say a Hill? I am just trying to understand why such bad range for 1 Watt? I'm sure a 5 Ft piece of wire would have at least 1-3 db gain to it no?
The 1-Watt Contour Map and the added comments give the best sense of the coverage area being talked about in all the discussion about 15.239 compared to 1-Watt.
That's the ball field we are playing in and shooting for.
Very informative.
60 dBuV is house penetration on a portable radio. Isotropic: is a physics term that means identical in all directions.
isotropic is theoretical and no antenna in the real world replicates an isotropic. i would say a 1/4 wave mounted on top o a mast at least 1 wavelength away from any reflecting material might be the closest you will come to a real world isotropic. even a 1/4 GP iirc has some gain over an isotropic.
WDCX feel free to come and correct me if i am mistaken.
For anyone curious I believe WDCX is using this site for pattern plotting
If you want Radio-Locator Style use 60 50 and 40 dbu on the plot.
If you want to get really technical...
Most listening actually takes place in the 64 dbu contour. This is where nearly every radio acts the same with only the cheapest of the cheap having issue.
You will also realize VERY quickly one size does NOT fit all for VHF propagation.
To Legacy: I sugguest you tune your antenna, you might be pleasantly surprised how much better it performs.
http://www.csgnetwork.com/freqwavelengthcalc.html
KC8GPD said: "WDCX feel free to come and correct me if i am mistaken."
I said: That's a job for Rich. 🙂
Another Note in Regards to Legacy's concerns about coverage,
Keep in mind WDCX's map shows ONLY the 60 dbu. Left out are the 50 and 40 dbu which majority of car tuners can recieve with little difficulty. On low noise days the 32 dbu can also be recieved. But 40 is about the limit.
You also mentioned stereo, Car tuners mix to mono when the signal gets weaker to reduce noise. These are some of the several reasons we cannot and should not use a car to determine range.