In article om,
says...
Hi:

What is the highest radio frequency used for astronomy? Is it 3,438
GHz?

According to the link below, it is 3,438 GHz:

http://books.nap.edu/openbook.php?re...=11719&page=11

Is 3,438 GHz the highest radio frequency used for astronomy?


Thanks,

Radium



Actually, it says 3 THz.
3.4GHz is C band, like satellite TV. Ku band sat TV is 12GHz.
There are many off-the-shelf radio instruments available well above this.