Actually, the fundamental emission frequency is 18.7khz.

It has a 32.76 Khz crystal, wouldn't the transmit frequency be around
16.3 khz?

Does anyone know the identity of the single chip that has 32 pins and
appears to drive each of the LM1875T transmiter chips? I can't make it
out on the pdf I downloaded.

Thanks,

A



https://gullfoss2.fcc.gov/prod/oet/c...tion_id=91640&
fcc_id='KE3IF100'