FM Radio antenna trim

OK, I've got this old am-fm radio that has an antenna trim screw in the back.

From what I remember back in the day, there is an ideal frequency to have the radio on when adjusting the antenna for max reception.

Anyboby remember what frequency you set the radio to be able to adjust this trim screw for the best reception?

 

I'm pretty sure the trim adjustment was for AM radio; I could be wrong (I was once before). .......Bob

 

You might be right, hell, it's been too long ago....
I was wrong once myself, I thought O.J. was guilty

 

I believe you set the dial for the weakest AM station in your area, then you turned the screw until the station was strongest. That should give you the best reception for all the stations. Make sure your mast antenna was extended all the way before making any adjustments.

 

I also think it was just for the AM. I remember doing it once, and maybe the closest radio station in the 1400 range.

 

The tuning was for the AM signal and as was stated, the radio should be tuned to a weaker station on the upper end of the AM scale. Cars that were equipped with a factory AM FM radio had a fixed length solid antenna that was approximately 31" long. The telescoping antennas were for AM reception only.

I sure remember extending the antenna for my '57 Chevy's AM radio so I could pick up WLS in Chicago or KXOK in St. Louis. That was if the OZ4 tube was not shot. Those were the days!!!