Repeater Coverage

[N4GIX]

I just spent some time at "Radio Mobile Online" creating a rough coverage map for my planned GMRS repeater. So far, it looks encouraging. Of course, this has some conservative assumptions:

Antenna height: 45' (13.7m)
Antenna gain: 6dBi
Antenna type: Omni
Transmitter power: 20 w

Mobile Antenna height: 2m
Mobile Antenna gain 2dBi

 

[kayn1n32008]

I just spent some time at "Radio Mobile Online" creating a rough coverage map for my planned GMRS repeater. So far, it looks encouraging. Of course, this has some conservative assumptions:



Antenna height: 45' (13.7m)

Antenna gain: 6dBi

Antenna type: Omni

Transmitter power: 20 w



Mobile Antenna height: 2m

Mobile Antenna gain 2dBi

Do not forget to include system losses(duplexer/combiner/feed line) they will impact coverage.


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[N4GIX]

Do not forget to include system losses(duplexer/combiner/feed line) they will impact coverage.

Oh, I didn't forget. In fact, I took the time to calculate all losses that I could in order to make this as conservative as possible. I just didn't take the time to report all those details here.

I'm also working on another coverage map based on portables...

 

[kayn1n32008]

I only posted that as you did not include it in your system description. Figure -6dBd for the portable antenna 'gain'. Even more loss for on belt or on belt, in car.


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[kayn1n32008]

I'm also working on another coverage map based on portables...

With the non-online version of RM, you can keep one plot, and do another. Yellow and blue work very well. Yellow for mobile and blue for portable. This way you can see both portable and mobile coverage on one plot.

This plot: https://www.repeaterbook.com/repeaters/details.php?state_id=CA01&ID=111 shows mobile coverage in blue and portable coverage in green(but plotted using yellow. Blue and yellow make green)


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[mformby]

Your mobile receiver sensitivity comes into play here also. It doesn't matter how far your repeater talks if you can't hear it. There is a noise level every where that you have to get over, and in your area it is probably pretty high.

 

[N4GIX]

The projection shown in green is assuming at least 1.58 mv signal, the yellow area assumes minimum of 0.5 mv signal.

If I were still living in Kingsville,TX I'd hang the antenna off one of my 500' tower's sidearms. I owned the GESS in southwest Texas.

 

[rfradioconsult]

The projection shown in green is assuming at least 1.58 mv signal, the yellow area assumes minimum of 0.5 mv signal.

If I were still living in Kingsville,TX I'd hang the antenna off one of my 500' tower's sidearms. I owned the GESS in southwest Texas.

You remember the tower at Port O'Conner hit by the Navy jet in the early 80's?

 

[N4GIX]

You remember the tower at Port O'Conner hit by the Navy jet in the early 80's?

I remember that incident, but it was before I had moved to Kingsville and bought the GESS from it's then owner. My main tower was located just a few miles from the massive FCC monitoring station.