Subject:Icom R8500 Mod

From:Jack Albert 



Here's a modification that I developed for the Icom R8500 shortwave

receiver.





Operating the Icom R8500 in other contries.



Caution: Monitoring Cellular frequencies is illegal in the U.S.



If your traveling abroad and you want to re-program your R8500 to match

the version in that country.  Use the table below.



           Version   |     |      | #03  | #05 | #02

       Programming   |     |      |      |     |

          Resistor   | AUS | DEN  | EUR  | FRA | USA

              R516   |     |      |  X   |  X  |

              R517   |     |  X   |      |  X  |  X

              R518   |  X  |      |  X   |  X  |  X

              R455   |  Z  |  Z   |  Z   |  Z  |                



X = populate the position with a 3.3k ohm 603 size surface mounted

resistor

Z = populate the position with a 1k ohm 603 size surface mounted

resistor



+-----------+--------------------------+

| Version   | Frequency Coverage (MHz) |

|-----------|--------------------------|

|           |  0.10000 -  823.99999    |

| U.S.A     |849.00001 -  869.99999    |

|           |894.00001 - 1999.99999    |

|-----------|--------------------------|

| Europe    |  0.10000 - 1999.99999    |

| Australia |                          |

|-----------|--------------------------|

| France    |  0.10000 -   87.50000    |

|           |108.00000 - 1999.99999    |

+-----------+--------------------------+



Remove the top cover and locate the main PC board (it's to the rear or

the

chassis and holds the speech option, see the operators manual).  R516,

R517

and R518  is located in the right hand corner inside the small metal

can.

There will be 4 adjacent resistor positions with 2 positions populated

(R517 & R518)the top position is unknown.  The small metal can is

located  

on the right hand side of the main board.  R455 is located below and to

the

left of J12 (the speech module connector).  R455 is also unpopulated and

it's to the left of R140.  



If you can't find a 603 size surface mounted resistor, carefully

unsolder

an exsisting resistor and re-populate it in another position.  R455 can

be

replaced  with a zero Ohm resistor by shorting the position with a fine

stran of wire that was taken from a ribbon cable.  



After the modification, the radio will lose it's memories and will

require

reprogramming.



--

Amsterdam



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