Modifications for the ICOM - RogerK

In addition, if you want to put an external antenna for 830-950MHz, put coaxial cable in the circle on this picture.This mods is shown in a web page in Japan. That means it wouldn't work well coz this mod is for IC-2330 sold in Japan.Please try to do it and let me know the result.Regards//Takeshi Kudohtakeshikudoh@usa.net.MODIFICATION.NETThis modification is read 604 times.top of page19-07-1998(IC-2340) IC2340H att modificationFrom: 4z4zq@pc.4z7aba.ampr.ORG (Pinchook Ronen)This text deals with ICOM's Mobile radio IC2340H. On some of icom dual band mobile transceivers there is an RF attenuatorwhich attenuates the received signal by 20dB. In my opinion this is a great feature especially when you operate in cities or inarea's with lot of RF signals, repeater, etc.The attenuator function reduce the intermodulations that appears while receiving in those areas, and let you listen more quietlyon your favorite channel, when you listen to a local repeater you can hardly feel the 20dB attenuator, but the intermodulationsalmost disappear.The problem is that the attenuator was featured on old icom mobile rigs (such as IC2340H, IC3230H), but not on the IC2340H.The next lines will guide you how to add this feature. All you need is 2 1p2t small switch, and 2 12Kohms resistors.VHF MODIFICATION1. Open the upper cover of the transceiver.2. Locate D9 on the print (left to the Power Amplifier while looking from the front of the transceiver)3. Solder a 12K resistor to the anode of D9 as close as possible to the diode, (with no wire, the pin of the resistor should besoldered to the pin of the diode)