[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [Discuss-gnuradio] DBS Dish Feeds

From: Marcus Leech
Subject: Re: [Discuss-gnuradio] DBS Dish Feeds
Date: Tue, 06 Dec 2005 21:40:12 -0500
User-agent: Mozilla Thunderbird 1.0 (X11/20041206)

Matt Ettus wrote:

DBS small satellite dish systems often have LNB feedhorns capable of
multiple polarizations and/or multiple bands.  This is often controlled
by changing the voltage which powers the device.  However, some have a
more complex control system involving tones in the 20kHz range if my
memory serves correctly.  Is there anyone who has a reference on this
control system, or who knows how it works?  I want to use these for
radio astronomy with the USRP and need to know how to control them.


Polarization is selected either using LNB voltage level (13V and 17V are typical thresholds), or using DiSEQC, which is a 22Khz digital code that can be used to control feed parameters and also control any mechanical arm on the dish, and also change LO frequencies on
 the LNBF

The specification can be had here:


Maxim also has an app note or two about interfacing to DiSEQC equipment

reply via email to

[Prev in Thread] Current Thread [Next in Thread]