Modifications for the ICOM - RogerK

1200 Mhz ------------- -------------------- ----------------------------------------------------------------------------Diodes are 1SS-211 or any high quality silicon signal diode Matrix is located at display-B of EX-601 remote controller.D36 D32 D28 D24 D20 D16 D12 D8 4D37 D33 D29 D25 D21 D17 D13 D9 3D38 D34 D30 D26 D22 D18 D14 D10 2D39 D35 D31 D27 D23 D19 D15 D11 1A B C D E F G HAll changes are made in the control head.Diodes are arranged in a 8x4 array: A-H, 1-4.As shipped from the factory, the diodes are arranged thusly:X = diode in place____________________________________| | X | X | | | | | X | 4|---|---|---|---|---|---|---|---|---| | X | | X | | | | | 3|---|---|---|---|---|---|---|---|---| | X | | | | X | | X | 2|---|---|---|---|---|---|---|---|---| | | | | | | | X | 1|---|---|---|---|---|---|---|---|---| A | B | C | D | E | F | G | H |To add receive coverage on 6 meter and 70 cm bands only:C=cut diode, or remove____________________________________| | C | X | | | | | X | 4|---|---|---|---|---|---|---|---|---| | X | | C | | | | | 3|---|---|---|---|---|---|---|---|---| | X | | | | X | | X | 2|---|---|---|---|---|---|---|---|---| | | | | | | | X | 1|---|---|---|---|---|---|---|---|---| A | B | C | D | E | F | G | H |440 Band - to expand coverage from 420 - 470 MHz:Remove diode D25 (3,D) for RXInstall diode in (3,C) for TXVCO in 440 module covers a 20 MHz range - re adjust as needed.220 Band - to expand TX coverage from 216 - 236 MHz:* This mod hasn't been tried and verified. *Install diode (1,C) for TXRemove diode (2,D) - ?144 MHz Band - to expand TX coverage from 138 - 174 MHz:Install diode in (1,C)50 MHz Band - to expand coverage from 40 - 54 MHz:Remove diode D32 (4,B) for RXInstall diode in (4,A) for TX28 MHz Band - to expand coverage from 28 - 40 MHz:Remove diode D33 (3,B) for RXInstall diode in (3,A) for TXMobile extender (cross band link) operation:Install a diode in position (1,A) in the control head.Open the Interface A unit, and look for two switches near where the optional tone and digital squelch boards go.(next to the "option 1" space" Put these two switches in position 2, then reassemble unit.To operate as a crossband link: