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-
- ICOM 02,03,04 SERIES MATRIX INFORMATION
- =======================================
-
- All cathodes down (to R20 or R21)
-
-
- | | | | |\ | | |
- R21 ----|----|----|----|---- R21 ----|--\-|----|----|----
- |\ |\ | |\ | | | |\
- R20 ----|--\-|--\-|----|--\- R20 ----|----|----|----|--\-
- | | | | | | | |
-
- 118.00 init 220.00 init
- 0 - 330 range 220.00 - 224.99 range
-
- *********
-
- | | |\ | | |\ | |
- R21 ----|----|----|--\-|---- R21 ----|----|--\-|----|----
- | | | |\ | |\ | |
- R20 ----|----|----|----|--\- R20 ----|----|--\-|----|----
- | | | | | | | |
-
- 220.00 init 430.00 init
- 0 - 699.99 range 430.00 - 339.99 range
-
- ***********
-
- | | | | | | |\ |
- R21 ----|----|----|----|---- R21 ----|----|----|--\-|----
- |\ |\ | | |\ | | |
- R20 ----|--\-|--\-|----|---- R20 ----|--\-|----|----|----
- | | | | | | | |
-
- 440.00 init 144.00 init
- 327.68 - 627.68 range 0 - 699.99 range
-
- ***********
-
- | |\ | | | |\ | |
- R21 ----|----|--\-|----|---- R21 ----|----|--\-|----|----
- | | |\ | |\ | | |
- R20 ----|----|----|--\-|---- R20 ----|--\-|----|----|----
- | | | | | | | |
-
- 140.00 init 144.00 init
- 140.00 - 151.99 range 144.00 - 147.99 range
-
- ***********
-
- This represents a few of the matrix combinations possible for the Icom
- 02/03/04 series of radios. In addition the placement of a diode from R10 to
- R23 (cathode at R23) (Icom type 'D' diode at schematic position D405) will
- allow direct 10 Mhz entry from the keypad. This works on newer serialed
- radios also.
-
- **** NOTE !!! **** Icom has bowed to pressure from the commission and made
- changes in software to disallow transmit out of band. However, receive
- modifications STILL WORK. On the 02, simply:
-
- remove the diode marked on the schematic as 402 (D2 on the board). On the 04,
- remove the diode at 402 and connect a 1N4148 type diode between R11 (anode)
- and R20 (cathode).
-
- Make these modifications at your own risk. I do not recommend you try
- experimenting unless you are willing to accept the consequences of your
- actions.
-
- For further information see my article in 73 Magazine. June 1986.
- My address from that article has been corrected to:
-
- Tim Wright AL7DS
- 704 N. 7th Ave.
- Maywood, Il. 60153
-
-