Icom R71 MW pre-amp enable modifiaction problem
 

Hi all

Has anyone performed the R71 pre-amp enable mod for frequencies below
1600 Khz, as described in Don Moman's excellent performance manual?

It states in the manual that to enable the pre-amp for MW, it is
necessary to clip diode D23. I did this but instead of enabling the
pre-amp for MW, it seemed to disconnect the S-meter.

Anyone else had this problem? Once I resoldered the diode ends
together, the S-meter worked as normal. Was the board layout changed
for different versions? I don't know when my R71E was manufactured,
but it has the old Icom logo and the PBT control.

Cheers

Andy

My brother has one of them. I think that he somehow disconnected the
transistor that enables the MW attenuator.

Pete

Andy Bown wrote in message
m...
Hi all

Has anyone performed the R71 pre-amp enable mod for frequencies below
1600 Khz, as described in Don Moman's excellent performance manual?

It states in the manual that to enable the pre-amp for MW, it is
necessary to clip diode D23. I did this but instead of enabling the
pre-amp for MW, it seemed to disconnect the S-meter.

Anyone else had this problem? Once I resoldered the diode ends
together, the S-meter worked as normal. Was the board layout changed
for different versions? I don't know when my R71E was manufactured,
but it has the old Icom logo and the PBT control.

Cheers

Andy