Reference to the official Icom 756 Pro III spec sheet will show you that the
MW band below 1.8 Mhz is attenuated by 11 dB, a significant suppression that
will prevent you hearing that really faint distant DX.

The mod to remove this suppression is to be found on:
Sheet 4 reverse side (back) of the "schematic diagram" at the top just left
of the middle of the diagram.
the mod is
bridge R801 to R803
disable/disconnect C802

I am told that the schematics for the Pro/Pro II may not be the same as for
the Pro III

The mods for the 756 Pro have been described in great detail by Dallas
Lankford and a Google search will reveal them.
Look for:
IC-746Pro Impressions & Mods

Dallas Lankford, 6/13/04
--
John Plimmer, Montagu, Western Cape Province, South Africa
South 33 d 47 m 32 s, East 20 d 07 m 32 s
RX Icom IC-756 PRO III with MW mods
Drake SW8 & ERGO software
Sony 7600D GE SRIII
BW XCR 30, Braun T1000, Sangean 818 & 803A.
GE circa 50's radiogram
Antenna's RF Systems DX 1 Pro, Datong AD-270
Kiwa MW Loop
http://www.dxing.info/about/dxers/plimmer.dx


"Bart Bailey" wrote in message
...
In posted on Wed, 28 Sep
2005 16:21:30 +0200, John Plimmer wrote: Begin

As it comes from the factory, the Icom 756 Pro series has the MW band,
that
is under 1600 Khz, attenuated.

I think all bands outside of the one you're tuned to are attenuated,
that's why the dual VFOs are best used on frequencies within the same
range, but I haven't noticed the MW region to be any more attenuated
than any other. I use either a tunable loop or a 42 foot vertical
depending on target and conditions, and get good results.

The mod that the local South African Icom agent did for me to restore full
sensitivity below 1600 Khz on the MW band was based on diagrams supplied
by
friends in the States.

I have the full set of schematics that came with it,
but it's no trivial task to spot a band specific feature.
Maybe you could post the chip involved and I could focus my search?

I did not do the mod to enable the preamps below 1600 Khz, as I found the
normal sensitivity more than adequate,

That's the mod I was referring too, if such exists, besides, you don't
have to enable them if you don't want to. I actually use the attenuator
on local stations if I want to get a better view of their signal in the
spectrum scope.

side note - I enjoy trying to dig weaker distant stations out from
underneath strong locals, for example Here in San Diego KFMB 760 is a
monster, but just next door (at night) is a station on 770. It's
programming isn't particularly interesting so I haven't listened long
enough to confirm the call (I think it's KKOB Albuquerque, NM ).
Another weak adjacent target is 810 KGO SF which is next to 800 XESPN
Tijuana. I use upper sideband on KGO 810 and can actually employ the
wide 3.6kc bandwidth filter to get reasonable quality audio. Back before
XESPN 800 became an affiliate for the entertainment sports network, it
was an over-modulated XEMM ("Musica Mariachi") that no amount of
filtration could overcome.

--

Bart