[Milsurplus] BC-457

[Dan Cox]

Hello, it is my understanding that according to a radio familiarization 
manual I found online for the b17 that it had a 453,4 and 5 receiver as 
well as TWO 457 transmitters.  Now one receiver is for navigation but 
why have two transmitters that only cover one band?  Why not have a 
transmitter that covers each of the other two receivers coverage?  I 
wonder if maybe the manual is wrong.

Thanks
Dan