Not sure whats up with LBC but I'm picking them up on 108.0 super low audio with the mildest of background noise. I though it was a blank carrier at first then i wacked up the volume to try and make out what it is and it's LBC.

Local oscillator IF 10.7 MHz above 97.3

It's probably just an iTrip (low power car transmitter), I often pick them up around here and have heard people listening to LBC on them numerous times.

mpx wrote: ↑Sun Jan 05, 2025 12:27 am Local oscillator IF 10.7 MHz above 97.3

I had this as a student. The local oscillator (LO) of someone's radio listening to LBC (which we called "El Bee Seein' ya") was clearly audible on 108 MHz over quite a wide difference. The low modulation is caused by the AFC on an analogue tuner modulating the LO a little.

Well suppose they can always have service for pilots if it goes to 109, someone else here had one though I think that was joke

reverend wrote: ↑Wed Jan 29, 2025 1:59 pmhe low modulation is caused by the AFC on an analogue tuner modulating the LO a little.

there would be microphony effects.. with the volume up more, it would be a bit more noticeable. I recall a radio next door, receiving its FM LO, as well as being able to tell what FM station they were listening to (+10.7), I could tell someone near the radio was talking (though could not make out what was being said!) as the sound was very slightly modulating the LO.
Poorer designed radios might radiate more LO signal.
Modern radios with DSP do not have a LO at +10.7 MHz

BTW, to be fair, amend the title about LBC spogging, when they were not!