Vipersan
Emmett Browns Ghost
- Joined
- Jun 29, 2009
- Messages
- 10,918
- Reaction score
- 6,663
- Points
- 113
- Age
- 66
- My Satellite Setup
-
IP9000HD +
TD110 Dish and TD88 Dish in Tandem
66°East to 60°West.
AZbox PrmHD + OpnbxS9HD + Skybox + DrHD F15
2x VboxII AZ-EL
2 m+ Alcoa PF + BSC421 C-Band lnbf...
+SS2/TwHnS2-3200 pci/TBS6925 pci
1.5 Fortec Star -Gbox - HtoH Ku/Ka/C
- My Location
- UK
It is interesting that what we refer to as Ka band ...which we further subdivide into 4 separate bands A B C & D ...are in actual fact K band ...
and that Ka Band is actually 27ghz to 40ghz..
K being Kurtz ..
A reference to the German word for 'Short' ...which has the area of electromagnetic spectrum first used for effective search radar scans ..
Sadly for them and great for us I suppose this area of spectrum proved ineffective due to what we know as rain fade ..which made the radar practically useless in rain or thick mist/fog conditions.
Thus the radar system was moved down frequency 12 > 18 ghz ..
This was known as UNDER Kurtz ....or Ku
we know that ku extends at least in satellite terms from 10700 > 12750 but strictly speaking only the top end is Ku ...and the lower end was originally classed as X band..
So 27ghz to 40ghz is actually Ka ...or in other words ABOVE Kurtz..
Now then ...there is a massive gap in modern satellite downlink frequencies 12.750ghz to 18ghz ...
...and it got me wondering what is 'inside' this gap ..
Is it all perhaps used for uplink frequencies ??
Is it perhaps used by military or scientific institutions ??
Or is it simply not used extensively because of propagation issues ??
Anyone fancy having a stab at this question.
rgds
VS
and that Ka Band is actually 27ghz to 40ghz..
K being Kurtz ..
A reference to the German word for 'Short' ...which has the area of electromagnetic spectrum first used for effective search radar scans ..
Sadly for them and great for us I suppose this area of spectrum proved ineffective due to what we know as rain fade ..which made the radar practically useless in rain or thick mist/fog conditions.
Thus the radar system was moved down frequency 12 > 18 ghz ..
This was known as UNDER Kurtz ....or Ku
we know that ku extends at least in satellite terms from 10700 > 12750 but strictly speaking only the top end is Ku ...and the lower end was originally classed as X band..
So 27ghz to 40ghz is actually Ka ...or in other words ABOVE Kurtz..
Now then ...there is a massive gap in modern satellite downlink frequencies 12.750ghz to 18ghz ...
...and it got me wondering what is 'inside' this gap ..
Is it all perhaps used for uplink frequencies ??
Is it perhaps used by military or scientific institutions ??
Or is it simply not used extensively because of propagation issues ??
Anyone fancy having a stab at this question.
rgds
VS