Modifications for the ICOM - RogerK

output (in a similar manner to this circuit), violate chip specifications.In this diagram "+" means "cross", that is, no connection; '*' means connection..----------. ---------------| .---+-| 1 16 |---- +5V| +| | | |+| C1 --- --| 2 +10V 15 |----- GNDC3 --- --- | |--- | | Tx Out 14 |------> RS232 Pin 3 .---> RS232 Pin 7| ------| 3 | |+5V .-----| 4 Rx In 13 |------< RS232 Pin 2 GND+| | |C2 --- | Rx Out 12 |-----. +5V--- | | | || | Tx In 11 |--. | R------| 5 | | | |.------------| 6 -10V 10 | ---+---* -----------| | 7 | | | .----| 1 14 |--- +5VC4 --- | 8 9 | | -----+----| 2 13 |--- --------------- ---------+----| 3 12 |+| ICL232 *----| 4 11 |GND | | 5 10 || | 6 9 |C1, C2, C3, C4 = 47 uF | .-| 7 8 |R = 270 ohms | | -----------| GND 7417Optional Regulator |---- ICOM-Radio-------------| |13.8V >-*--| IN OUT |----> +5V| | |C5 --- | | C5 = 0.1 uF--- | |*--| Common | In words: Tie 13.8V to the Input Pin and to a| ------------- 0.1 uF capacitor connected to ground.GND 7805 Tie the Common regulator pin toground.The Output Pin is +5V.This modification is read 1654 times.top of page19-07-1998(IC-736) Speed-up the ALC for IC-736Jun 1995Hallo, my name is Claus and the QTH is in Rastatt nr Baden-Baden South-West Germany. I got a IC 736 in December 1994. It isa good rig but had also a lot of misstate. After a time of measuring and testing I found the ALC for transmitting is to slow. So Ijacked the circuit why is so. I found a C-R delay in the way from the ALC on the Main Unit. It is the C287(1uF) and theR305(150Ohm). The C change or put out is not very easy. So I change the Resistor 305 in to smaller one. But the result was notbetter. The best result I had without it! So the C-R combination is not in the work for the ALC. The Resistor 305 is very small butit is easy to put out. On the Resistor is the number 151 printed (150Ohm) but you mast find it on the circuit.To be wide TX you mast only cut the Diode D15 on the Logic Unit.The IC 736 works very well at the last half year so I send it out in the PR-news now.This modification is read 892 times.top of page