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Modifications for the Kenwood TR-3500
  TR-2500/3500 dip switch setting  
     

The following is a list of the Dip Switch settings for the Kenwood TR-2500/3500.
It is mainly intended for those who have the radio but lack the info.
 
              1=ON
              0=OFF
                            SWITCHES
FREQUENCY                 !1-2-3-4-5-6
---------                  -----------
 67.0                      1 1 1 1 1 1
 71.9                      1 1 1 1 0 1
 74.4                      1 1 1 0 1 1
 77.0                      1 1 1 1 0 0
 79.7                      1 1 0 1 1 1
 82.5                      1 1 1 0 0 1
 85.4                      1 1 0 0 1 1
 88.5                      1 1 1 0 0 0
 91.5                      1 0 1 1 1 1
 94.8                      1 1 0 1 0 1
100.0                      1 1 0 1 0 0
103.5                      1 1 0 0 0 1
107.2                      1 1 0 0 0 0
110.9                      1 0 1 1 0 1
114.8                      1 0 1 1 0 0
118.8                      1 0 1 0 0 1
123.0                      1 0 1 0 0 0
127.3                      1 0 0 1 0 1
131.8                      1 0 0 1 0 0
136.5                      1 0 0 0 0 1
141.3                      1 0 0 0 0 0
146.2                      0 1 1 1 0 1
151.4                      0 0 1 1 0 0
156.7                      0 1 1 0 0 1
162.2                      0 1 1 0 0 0
167.9                      0 1 0 1 0 1
173.8                      0 1 0 1 0 0
179.9                      0 1 0 0 0 1
186.2                      0 1 0 0 0 0
192.8                      0 0 1 1 0 1
203.5                      0 0 1 1 0 0
210.7                      0 0 1 0 0 1
218.1                      0 0 1 0 0 0
225.7                      0 0 0 1 0 1
233.6                      0 0 0 1 0 0
241.8                      0 0 0 0 0 1
250.3                      0 0 0 0 0 0

 
  TR-2500 RX IMD Improvement  
     

RX intermodulation distortion may be improved by reducing second conversion oscillator harmonic content and level. No adjustments are required. This may be applied to a unit specifically exhibiting out-of-band intermodulation distortion. It is, however, not a general improvement.

On the TX RX unit X44-1460-xx, perform the following changes: 

R55  from   47 Kohm       delete
C73         47pF     to   33pF    (CC4SSL1H330J)
C74         100pF         150pF   (CC4SSL1H151J)

Add a shield between Q1, (R3, C5) and C73 (from L1 to near X1).

These changes are at the owner's option, and may not be installed in-warranty.

Note: The information presented is complete and accurate to the best of our knowledge. However, Trio-Kenwood Communications assumes no liability either for your work, or for consequential damage resulting from your work.
        

Remember it is Illegal to transmit out of band. This Modification is for Informational purposes ONLY.
Doing such modifications on your radio may void any warranty and damage your equipment.
All mods found on this database are offered to me by other amateur radio hams or captured by Packet system. 
KB2LJJ  take no responsibility or liability for any damage done resulting from any modification.  

 I have been trying to help our ham radio with the radio modifications and have asked for any type of new radio mods.
 However, I haven't received too many.  If all of you contributed a little more,  I believe I would be able to help 
all the other ham's that are looking for these mods. I know it is possible to get more mods from all the Ham's because of
 the wide range that exist throughout the world.  By doing this we can  flourish and enjoy more of this hobby that 
we've taken part in for so many years. Furthermore, I ask you not to forget to send me any modifications that you might
 have through email.  I would really appreciate it.

      Email                webmaster@kb2ljj.com

 73's
   John Ribeiro
             KB2LJJ