Calculating dish size from dBW

[A.h. king]

Please can anyone tell me how could I found out the appropriate dish size from just knowing the dBW?

 

[nelson_b]

will this do ok ?

 

[smiffie]

I have used this chart as a guideline in the past to calculate the required dish size based on the dBW level displayed on the target satellite footprint. Be careful to check the full specification of a dish before buying as in the past I've been supplied with a dish that was supposed to be 85cm and had reflector dimensions of 78X70cm and a 90cm which had dimensions of 105X97cm.

[TD="class: xl26, colspan: 2"]Ku band
[/TD]

[TD="class: xl23"]EIRP[/TD]
[TD="class: xl23, width: 64"]Size[/TD]

[TD="class: xl24, width: 64"](dBW)[/TD]
[TD="class: xl24, width: 64"](cm)[/TD]

[TD="class: xl25, width: 64"]>50[/TD]
[TD="class: xl25, width: 64"]50[/TD]

[TD="class: xl25, width: 64"]50[/TD]
[TD="class: xl25, width: 64"]50-60[/TD]

[TD="class: xl25, width: 64"]49[/TD]
[TD="class: xl25, width: 64"]55-65[/TD]

[TD="class: xl25, width: 64"]48[/TD]
[TD="class: xl25, width: 64"]60-75[/TD]

[TD="class: xl25, width: 64"]47[/TD]
[TD="class: xl25, width: 64"]65-85[/TD]

[TD="class: xl25, width: 64"]46[/TD]
[TD="class: xl25, width: 64"]75-95[/TD]

[TD="class: xl25, width: 64"]45[/TD]
[TD="class: xl25, width: 64"]85-105[/TD]

[TD="class: xl25, width: 64"]44[/TD]
[TD="class: xl25, width: 64"]95-120[/TD]

[TD="class: xl25, width: 64"]43[/TD]
[TD="class: xl25, width: 64"]105-135[/TD]

[TD="class: xl25, width: 64"]42[/TD]
[TD="class: xl25, width: 64"]120-150[/TD]

[TD="class: xl25, width: 64"]41[/TD]
[TD="class: xl25, width: 64"]135-170[/TD]

[TD="class: xl25, width: 64"]40[/TD]
[TD="class: xl25, width: 64"]150-190[/TD]

[TD="class: xl25, width: 64"]39[/TD]
[TD="class: xl25, width: 64"]170-215[/TD]

[TD="class: xl25, width: 64"]38[/TD]
[TD="class: xl25, width: 64"]190-240[/TD]

[TD="class: xl25, width: 64"]37[/TD]
[TD="class: xl25, width: 64"]215-270[/TD]

[TD="class: xl25, width: 64"]36[/TD]
[TD="class: xl25, width: 64"]240-300[/TD]

[TD="class: xl25, width: 64"]35[/TD]
[TD="class: xl25, width: 64"]270-335[/TD]

[TD="class: xl25, width: 64"]34[/TD]
[TD="class: xl25, width: 64"]300-380[/TD]

[TD="class: xl25, width: 64"]33[/TD]
[TD="class: xl25, width: 64"]335-425[/TD]

[TD="class: xl25, width: 64"]32[/TD]
[TD="class: xl25, width: 64"]380-475[/TD]

[TD="class: xl25, width: 64"]31[/TD]
[TD="class: xl25, width: 64"]425-535[/TD]

[TD="class: xl25, width: 64"]30[/TD]
[TD="class: xl25, width: 64"]475-600[/TD]

[TD="class: xl25, width: 64"]<30[/TD]
[TD="class: xl25, width: 64"]>635[/TD]

 

[smiffie]

will this do ok ?

Just spotted as I was posting, but surely <30dbW requires something greater than 600cm? Not that it is particularly relevant for everyone other than the likes of Klaus Schumacher in his quest to pick up Astra 1 in Brazil.