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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:
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 onDBS 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. Thanks, Matt
the LNBF The specification can be had here: http://www.eutelsat.org/satellites/4_5_5.html Maxim also has an app note or two about interfacing to DiSEQC equipment
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