Modifications for the Kenwood TR-2500



19-07-1998 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
73s from Alan
N6QOG @ K6RAU.#NOCAL.CA.USA.NA.



08-04-2000 TR-2500 RX IMD Improvement
Author: Trio-Kenwood Communication, inc.


Service Bulletin no. 858 (24-5-1982)

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.