how many degrees of the arc does a 1.2 meter "see"

[drhydro]

Howdy folks,
Quick question here. I know my 10 foot bud "sees" 1 degree of the arc, how much does a 1.2 meter see?

 

[N4ST]

An estimate for dish beamwidth is Bw = 21900 / (F * D)
Where F is the frequency in MHz and D is the diameter in Meters.

So, for your 1.2M dish at 4000 MHz, the beamwidth would be about 4.6 degrees.

Note that this formula calculates about 1.8 degrees for your 10-foot dish.

If you are using that 1.2M dish in the Ku band at 12000MHz the beamwidth would be about 1.5 degrees

 

[drhydro]

Thanks, appreciated