On Jun 30, 7:05*am, dave wrote:
On 06/29/2011 11:12 AM, rkhalona wrote:



Thanks RHF. *I am looking for other users' experience. *My unit comes
from Radio Labs, with the filter upgrade (their so-called, "Clearmod"
modification).
The difference when I switch from AM wide to narrow is almost always
inaudible and, for all practical purposes, does not make any
difference without detuning the radio
in slow mode. *I wonder if owners of the stock radio experience the
same.
(The Radio Labs people think this is the way the radio is supposed to
work, which I found puzzling and surprising)

RK

This may be more of a function of the AM station's transmitter. Try
tuning off by 1 KHz so you get some sideband splatter. Can you hear
cymbals and sibilance, or do you hear crackling and popping? If it's the
latter, the station isn't transmitting any highs. See if the bandwidth
selector makes a difference while off tuned a little.

Hi Dave,

I have tried that and, as I said above, without detuning you would
never know there is a different filter in there, but one should hear a
difference when you switch
from wide to narrow, without detuning. According to Radio Labs, they
have used filter bandwidths of 4.5 KHz and 2 KHz for wide and narrow.
A 2 KHz filter should cripple audio fidelity noticeably (and reduce
interference), but I am hearing no difference. I have had two other
people listen independently and they say the same, so it is not just
my ears. I have now read a couple of reviews elsewhere that indicate
the bandwidth switch does very little (including the guys at Universal
Radio, whom I telephoned), so it looks like a flaw this radio has,
including the modified version.

RK