Was said:
> The tracon may be physically located in New Hampshire but it
> isn't clear whether they transmit from there 
>>     
There are all kinds of combinations of locations of the actual 
controller, and the transceiver sites. As one flies along there are 
boundaries both vertical and horizontally on a controller's turf. If you 
are departing an area, you get a "hand off" - "contact Cleveland 
Approach on 124.0". But if you are passing near or through the edge of a 
controller's area, but going to come back to the original controller in 
a short time, there may be a "point out" where the original controller 
advises the other controller of your intentions and the pilot never 
knows it has happened. It's not unusual for the pilot to be handed off 
to the same controller on a different frequency when either the 
controller is handling several areas (I should call them by the proper 
term "sectors"), or in sparse traffic areas, at lower altitudes, more 
than one transceiver is used to ensure radio 2 way communication. On the 
instrument  flying charts (maps) there is a  minimum communication 
altitude published. It is possible to fly a clearance at below that 
altitude (say due to icing at higher altitude), and the controller will 
ask you to contact a controller at a specific location ahead on your route.


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