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From: "Michael A. Terrell"
Subject: Re: Common IR remote control frequencies
Date: Wed, 23 Oct 2002 22:17:19 -0400
Organization: Do I have to? Well, Ok. If you insist!
X-Mailer: Mozilla 4.61 [en]C-CCK-MCD (Win95; U)
> I believe that a common frequency for the carrier used in IR controls is
> 38KHz and that certain satellite receivers use 115KHz for the carrier. The
> TSOP 1738 is a 3pin IR receiver that will decode a 38kHz modulated carrier.
> What would happpen if an IR control using 115KHz was aimed at this device.
> Would it strip off the carrier leaving the control
> pulses or would filtering in the TSOP1738 prevent any output?
> I am looking to design a universal IR repeater. The problem is getting a
> receiver to accept all carrier frequencies.
Why demodulate and remodulate them? Use a detector to see if it is
modulated above a set frequency and use the output to control
transmission. This way, your signal already has the right modulation
Michael A. Terrell
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