If the station can not establish a simplex path the audio will have to be done through the My question is when did FM radios start having EQ's built into them?
Always. In the form of preemphasis and deemphasis. But don't expect that to be an adjustable control or even on the outside of the rig, it is fixed but it is still EQ nonetheless.
Understanding very well all what has been said it's still good to ask for an audio report. In these cases being:
1. Microphone gain might be to high from the operator stand point which "no" repeater can adjust and will also affect the audio coming out of the repeater.
2. In case of preemphasis/deemphasis if the operators transceiver is not transmiting a 4-5KHz bandwidth FM quality signal the repeater will also not be able to adjust this resulting in low audio and narrow bandwidth. I know this to be true in the case of owning an Icom 7000 unless a mod is made. Fact!
In these two cases alone asking for an audio report will allow an operator to adjust accordingly so the repeater can do the rest of its job. As well as know if there is anything negative going on that he/she should be aware of.
Another good reason for audio reports maybe if an operator is looking for R.F., alternator wind or too much background noise ,or loose connection etc....The repeater is not adjusting all these factors and good reason for an operator to check if the quality of audible signal is just as good going in on the "simplex" side of the repeater as well on the outgoing side.
Am I crazy or is that not clear enough or how it goes?