I agree to Mr Fork: I always like realism in this game and I played very much with radar settings when I hosteds in H2H-arena two years ago.
I think it that way in FinRus maps:
1) Main control system in Finland (and mainly in Russia) based on an auditory perception from Aerial Control people (they were mostly young "Lotta"-women in their towers around the country in 1939 - 1944). They didn't always identify or even see the planes, but they could tell that engine sound has heared from this or that direction. Those Control Towers were everywhere in the East part of Finland and the Frontline commanders reported enemy contacts, too.
That means that Darbar is always on and maybe there might be a little delay because of the bad telephone connections. Finnish had only couple of German's radars around the capitol town Helsinki in the end of the Continuation War.
2) Our Air Command system was good when we are speaking it in Squads level (LLv 32, LLv34 etc.), but the Main Air Command system was poor almost whole War because of the poor top leadershipness. Actually we didn't have any centered Air Command and the Squads operated very indivdual.
Fortunately the Squads Commanders were experts and Marshall Mannerheim gave free hands to our Fighter experts Colonel Lorenzen and Lt.Col. Magnusson during the Soviet's Great Summer Offensive in 1944.
Magnusson created excellent telephone and radio based aerial control system to the Karelian Isthmus and the East Gulf of Finland when he was the Brewster-commander of the LLv 24 in 1941 - 1943. He gathered all the radios and telephones he found and built the system actually from the junk. This initiative work has rewarded in the summer 1944!
The beam of the Tower based radar range (again in Finland-Russia map) is about 15 miles, because the map's scale is 1:4. In the real world the radio men in the fronts, isles and coastlines reported enemy contacts about 60-80 miles distange from Airfields. As you see we didn't have any radars in the Airfields, so the radar adjustments must be a compromise with those things.
There must be about 1-2 minutes delay with the enemy dots in the map because of links between radio bases, telephone operators and Squads CO's.
Radar settings are Full Friendly without delay, because the CO's always knew where their several planes were. That's because we had so few Fighters and Bombers...
We had high top experts in our radio reconnaisance, too. They listened to Russian radio messages and warned countless times our Squad's CO's for enemy attacks here and there. The headquarters never understood how important it was, but our expert Squad CO's use this information very effective. Actually FAF Headquarter's Generals didn't know anything what was happening in the fronts and aerial reconnaisance. Thanks God!:D
Maybe you CT hosts can adjust Finnish Voice-radios that way we can listen what the Russe is speaking!:D