Modifications for the ICOM - RogerK

Two anenna connectors with automatic selector.High speed automatic antenna tuner.Level/width variable noise blanker.Gain selectable preamplifier (2 positions)SWR/Po/ALC/COMP/Id/Vd selectable large analog meterImproved quick split funtionConvenient memo pad functionVOX functionTransmit signal monitorDouble band stacking registerBuilt-in heavy duty power supplyRF speech compressorThis modification is read 1250 times.top of page15-12-1999(IC-775) IC-775DSP Out of Band Information1. Remove front panel to locate the main unit.2. Remove W1 chip jumper located next to R111 on the main unit.3. Re-install front panel.4. Push clear and turn on rig (CPU reset).This modification is read 1390 times.top of page19-11-2000(IC-775) Increase the sensitivity on MW-band 0.5-1.6MHz on IC-775 and IC-775DSPAuthor: SM4RNA Anders - sm4rna@telia.com.MODIFICATION.NETAt the input at the bandpassfilter on RF-Unit for MW, 0.5 to 1.6MHz, a 10dB attenuator is located. This attenuator also is acurrent limiter for the diode D19.By removing the attenuators three resistors and lead the diode current thru a inductor instead, the increased sensitivity isachieved. But important is to limit the current by changing the value on R119.To do the mod:1. R116 is exchanged with an inductor of 1mH.2. R117 removed and shorted.3. R118 is removed.4. R119 is exchanged with 150 Ohm resistor.All resistors are surface mount.The result is that the sensitivity is increased in the 0.5 to 1.6 MHz range is changed from -103dBm to -112dBm at 12 dB SINAD,