Modifications for the ICOM - RogerK

4. The other side of the resistor should be wired to the small switch (the switch can be mounted on the back of thetransceiver, there's an hole in the heatsink which you can use to insert the wires to the transceiver.5. The other side of the switch should be tied to 5V (you can find a 5V terminal at J2 pin 2, j2 & j1 located near the VCO at thefront of the print it is a 2*4pin sip connector, j2 is closer to the VCO.UHF MODIFICATION1. Open the lower cover of the transceiver.2. Locate D17 on the board (this diode is wired under the board, just beside L22. there are 2 holes, I am talking about the onelocated closer to the antenna)3. Solder another 12K resistor in the same way it was done in the vhf to the anode of D17 just under the print ( the anode isthe left pin of the diode ,the pin which located closer to the power amplifier.4. The other side of the resistor should be wired to the other small switch...5. The other side of the switch should be tied to 5V (for example to the right pin of the regulator IC7)ExplanationWhen you turn this switch on, it turns the diodes on, and attenuates the received signal.This modification was tested, but you will do it on your own risk.This modification is read 756 times.top of page20-01-2001(IC-2340) Some mods for the IC-2340HThe diodes D12 to D20 and D10 + D8 on the logic board is the diodes that control frequencyrange and model version.[Logic board]-----------------------------------------------------------------------------------+------ |W1 |||J 7 D14 D15 D12 D13 |+-------------------------------+ +----+ +----+ +----+ +----+ || | | | | | | | | | || | +----+ +----+ +----+ +----+ |+-------------------------------+ |+-----+ +----+ +----+ +----+ || | | | | | | | |+-----+ +----+ +----+ +----+ |D18 D19 D16 D17 ||+---------+ +--------+ || | | | |+---------+ +--------+ |D10 D8 |-----------------------------------------------------------------------------------+Minirepeater:●●●Remove D16 on logic board. (Not necessary on USA version)Set the desired QRG on each band.Push the [VHF MAIN] + [UHF MAIN] VFO knob and push [SET] at the same time.The memory channel indication changes to "L" (L=Minirepeater mode)To return to normal, push and hold [SET].Expand RX for the EUR version:By key funktion:●●Switch off the radio.Push the [V/MHz] (for VHF), and [SET] and [DN] on microphone at the same time, while turning on power.