# What is the meaning of carrier out for an IR receiver?

I was looking to buy an IR receiver to decode my remote control and was looking at a catalogue at http://www.vishay.com/docs/49845/_sg2145.pdf.

On page two the carrier frequency is mentioned as carrier out for the last two modules while for every other module it lists a specific frequency like 38 kHz,etc. Can someone help me understand what it is and if these are different than a regular IR receiver module?

• The 38 kHz ones are for signals which are OOK modulated (see en.wikipedia.org/wiki/On-off_keying ) and use a carrier frequency of 38 kHz. These IR receivers will supress/ignore signals with a different carrier frequency. The ones with the carrier output will output the carrier frequency, they might work with a wider range of carrier frequencies. – Bimpelrekkie Jul 12 '17 at 11:36
• so basically, i cant use the modules which output 'carrier out' since they wont be outputting the actual pulses but rather just the carrier frequency? – thunderbird Jul 12 '17 at 11:58
• Nope, you can use these but they might be sensitive to non-38 kHz remotes. The pulses (the modulation) will still come out otherwise these receivers would be pretty useless. But if you're using an 38 kHz remote (I believe 99% of them are 38 kHz) then you'd better use a 38 kHz one. – Bimpelrekkie Jul 12 '17 at 12:30