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Radio coverage in VRC?


Romano Lara
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So if for example I'm working on a really really large airspace. I'm talking about Philippines. In the real-world, there's 3 SSR situated at Laoag, Tagaytay and Mt. Majic, Cebu w/ maximum range of 250nm. So I have done the same with my VRC setup. See the image below:

 

My question is, if the aircraft is outside the vis range, can they still reach me via VHF? I know the vis range has nothing to do with radio coverage, but more with visibility itself. This is the main thing that's confusing me lately. I appreciate any clarifications/answers!

 

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Romano Lara
vACC Philippines, Manager - Training & Standards
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Yes, it has to do with your vis range. I have been told (haven't gotten it confirmed) that it uses a slant rule too so that from the edge of your visrange it slants outward like a real radio.. but I don't think it's true haha. To minimize the amount of data I see and the amount of bandwidth I use, I use minimal visrange and instead use different visibility points. On Approach, I can usually use 1 60nm visibility range, but if the approach sector is bigger (ie, Orlando) than I use 2 60nm vis points with a majority of it overlapping each other. Also just feels more realistic because I doubt there's a ground-based radar that has a primary range of 450nm

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No, vis range has nothing to do with when pilots see you on their list and can thus contact you. Vis range only determines at what distance you see blips on your scope.

 

Radio range (the distance at which pilots can see you and contact you) is based on a formula that starts with a base range that is a fixed value, different for each facility type, plus an additional range based on the aircraft's altitude.

 

So you could set your vis range to 5 or 500 and it won't affect your radio range at all.

Developer: vPilot, VRC, vSTARS, vERAM, VAT-Spy

Senior Controller, Boston Virtual ARTCC

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