Title: Modify icom ic211e. From: PE1GER@PI8MID.#ZLD.NLD.EU To : MODS@EU MODIFICATIONS FOR THE ICOM IC211 SSB & CW VARIABLE POWER Place set with the controls towards you and remove lid. If necessary check FM and CW power. Connect set to known good dummy load and power meter.Locate R13 and R14 on the small board behind the front panel RF power control. With RF power control on max, TX on FM and adjust RH pot(R13) for 10-12watts.Turn RF power control fully down and adjust LH pot(R14) for desired low power setting (min 200mw). Short key jack at rear of set, switch to CW, TX and adjust R129 for 10-12watts the same as on FM. Switch off power. Locate the brown wire to the left of the Xtal filter it runs from next to R258 to near R327 its marked with a small b on the main unit board layout diagram. Cut this wire at the front end and solder to the emmiter of Q65 or the purple lead marked I on the main unit layout. Solder the slider of a 4.7k preset to the LH end of the YELLOW WIRE behind R14,then solder a 3.3k resistor to one leg of the preset, run a wire from this resistor to the top of R272 (scrape the paint off before attempting to solder). Switch on ( Switch to CW, TX and with front panel RF power control fully down adjust the(4.7k preset for desired low power level (min 200mw) SSB power is the same as CW. The front panel control now affects both FM,CW & SSB power levels. RX GAIN 1 Replace R6 (220ohm)Q2 with a 25k pot this will give about 20-25db front end attenuation.however it will not decrease the background hash this has been tested by icom uk and works fine SIMPLE 600k TX SHIFT 1 TURN ON SET FROM COLD (NO MEMORY) FREQ =144.000 2 TURN TO VFO A 3 TUNE VFO TO 144.600 4 SWITCH TO SIMPLEX OR DUPLEX AS REQUIRED THE VFO'S WILL TRACK TOGETHER PROVIDED THAT THE MEM SWITCH IS ON EVEN IF THE SET IS SWITCHED OFF FROM THE FRONT PANEL PROVIDED POWER IS LEFT CONNECTED PIN CONNECTIONS FOR 24PIN MOLEX PLUG 1 Discriminator output 13 N/C 2 DC 13.8v from power switch 14 control for 100hz or 5khz step +5v for 5khz step 3 PTT when grounded =TX 15 Lock input to lock dial externally 4 Audio O/P un affected by volume 16 UDC input up/down external control 5 TX AF input 17 Scan input 6 +9v on tx 20ma max 18 CL input to clear freq 7 External alc input 19 FCL input clears last entry and inputs MHZ 8 Ground 20 K0 control data 9 NC 21 K1 control data 10 NC 22 K2 control data 11 NC 23 K4 control data 12 nc 24 K8 control data TAKE GREAT CARE NEVER TO APPLY A VOLTAGE OUTSIDE THE -0.5v TO =5v TO TERMINALS 15-24 inc AS THESE ARE CONNECTED TO THE LSI CHIP NOTES ON DATA INPUT PIN 15 Dial locked when 0v applied released by +5v or NC PIN 16 & 17 are used as a pair When 16 is low and a pulse is given to 17 freq counts down When 16 is high and a pulse is given to 17 freq counts up When the input to 17 is a square wave the min period between pulses =640usec Min period after last leading edge of an input to 17 before next change in 16 =640usec PIN 18 +5v clears LSI to 144.000mhz PIN 19 selects mhz as follows +v on 19 and k0 = 144mhz +v on 19 and k1 = 145mhz After inputing the mhz the remaining digits are put in in sequence,the required digits being selected by applying +v to the appropiate inputs as in the table 1 K1 6 K2,K4 2 K2 7 K1,K2,K4 3 K1,K2 8 K8 4 K4 9 K8,K1 5 K1,K4 0 K0 A KEYPAD DIODE MATRIX CAN BE CONSTRUCTED AS FOLLOWS using 1N4148 diodes X is position of diode PIN ON RIG KEY PAD NUMBERS 1 2 3 4 5 6 7 8 9 0 144 145 146 147 K0 X X K1 X X X X X X X K2 X X X X X X K4 X X X X K8 X X FCL X X X X A SUITABLE PSU IS AS FOLLOWS PIN 2---------------/\/\/\/--------------------------------------- 330ohm Z / 1 / 2 / 3 --- --- --- = = = pin 8---------------------------------- ------ -------- ----- to diode matrix line 1 line 2 line 3 ETC Z = 5.1v zener diode = = 0.1uf cap to gnd /1 = key 1 /2 = key 2 /3 = key 3 There is some more but i hope this will enable you to build the keypad most of this except the power mod will work on the Icom 245 as well good luck julian g6loh ******** Source pi8wfl@pi1wfl ******** I hope this information gives you a little help. Succes with the modifications. Theo Lepelstraat Holland.