On Sun, 29 Nov 2009 09:48:43 +0000 (GMT), "Dave Plowman (News)"
wrote:

In article ,
Michael A. Terrell wrote:
Most US car radios allowed the adjustment by removing
the tuning knob and using a small screwdriver to adjust the capacitor. A
lot of cheap imported radios had no adjustment, and had very poor AM BCB
performance.

My V expensive Blaupunkt doesn't have an aerial trimmer - nor have I seen
one for many a year. Thought most had some form of automatic matching
circuit these days?

Well that's related to my point. Maybe there is an automatic
matching circuit in the new radio that's not working, and he just got
lucky that it matched the new antenna. ??

So if he ever takes this radio to another car, again the AM won't work
if the matching circit doesn't work and he's not lucky with the new
car's antenna.


I asked him to read the manual to find out about antenna trimming, but
he didn't reply about that.