Re: Convert LO-Frequencies

from: owner-sat-drdish@tags1.dn.net
Date: Mon, 1 Sep 1997 17:20:11 +0200
At 13:37 01.09.1997 +0300, you wrote:
>Dear Sir,
>
>This might be the dummiest question you ever received, but please wait
>and help ....
>
>Channel frequencies on the KU band are given in this format : 11,745 /
>H
>
>But as you know receivers allow you to input 4 numbers only as frequency
>description :  like : 1547
>
>SO how do I map between five digit frequencies and the reciver, how do I
>enter 11,745 to the receiver ???
>
>
>:-)
>
>thanks
>
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Dr.Dish:
Ther are no dummy questions!
In order to get the four digits you have to know what local oszillator
frequency is used. It could be for the Ku-Band 10.0 or 9.75 GHz in low band.
If you got a 9.75 GHz LNB just take the given receiving frequency: 11.745
and subtract die LOH of 9.75.
11.745
-9.750
------
 1.995

This would be the four digits you have to enter. Much easier to convert is
the LOF of 10.0 GHz:

 11.745
-10.000
--------
  1.745

The same is with the high band. Twi differenr LOF´s are in use: 10.600 and
10.750 GHz. Again subtract the LOF from the given receiving frequency
(between 11.7 and 12.75 GHz).

For c-band the LOF is usually 5.150 GHz. But here you have to extract the
receiving frequency (say: 4.056 GHz) from the LOF:
 5.150
-4.056
-------
 1.094

---------------------------------------------------------
---------------------------------------------------------
Christian Mass (Dr.Dish)
Editor of TELE-satellite magazine (http://www.TELE-satellit.com)
Producer of drdish@tv, Europe´s first satellite info-channel
(http://www.sat-net.com/drdish/)
[Other mailing list archives]