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Modifications for the Kenwood TM-3530 and Dip Switch settings
TM-3530 Noisy transmit
Extended TX for the Kenwood TM 3530a 220MHz
radio
TM-3530 Noisy transmit
Author: Trio-Kenwood Communication, inc.
Service Bulletin no. 925 (2-11-1987)
In some early model of TM-3530 transceiver transmit noise may be generated as the unit warms up. The
following procedure will reduce the noise.
1. Disconnect the power cord and antenna.
2. Remove the top and bottom covers.
3. Replace L3 on the Compound unit (part number L15-0308-06). Before soldering the coil to the board,
place a drop of contact or silicon glus under the coil to prevent mechanical vibration.
4. On the Compound unit, solder two springs (part number G02-0550-04) to the heat sink as shown in
figure 1. The springs must be mounted high enough to make firm contact with the top cover when
installed.
5. On the PLL unit, solder a spring (part number F10-1206-04) to the TX VCO shield (See figure 2). The
spring must make firm contact with the bottom cover when installed.
Caution: The next step requires complete disassembly of the front panel and Display unit. This step may be
reserved for problem units.
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6. On the Display unit, replace jumper JP3 with a diode (part number 1S1555) as shown in figure 3.
7. Reassemble the transceiver and test the modulation for correct adjustment:
1. Apply a 1 KHz, 50mV signal to pin 1of the mic jack.
2. Turn VR7 on the Compound unit fully CCW.
3. Use a service monitor, linear detector, or deviation meter to measure the TX deviation at the
antenna jack.
4. Adjust VR5 on the Compound unit for +/- 4.5 KHz.
5. Reduce the mic signal to 5 mV. Adjust VR7 for +/- 3.0 KHz.
Figure 1.
Figure 2.
Figure 3.
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Time required for this modification is 1 hour or less.
Extended TX for the Kenwood TM 3530a 220MHz radio
Author: Bo (W7RTK) - [email protected]
First, my radio's serial is 8,080,XXX so if your radio is close, it should work.
This radio is the big brother to the Kenwood TM 2530a except it xmitts from 220Mhz to 225Mhz out of the
box. I will show you how to make it tx from 220Mhz to 229.995Mhz...
1. With the radio upside down and the face facing you, remove bottom screws.
2. Remove the bottom panel and locate the control unit number X53-1440-XX
3. Locate the big chip marked above it as IC 3 (see illistration below)
4. Just to the left of IC3, you will see a row of diodes D9, D10, D11, D12 and D8. D9, D10 and D12 have
already been removed from factory in my radio.
5. Cut diodes D8 and D11.
6. After cutting diodes, reassemble the radio, and then you must reset the microprocesser or the mod will
not take effect.
Here are the steps,
1. With the radio off, press and hold the "PS" key.
2. Turn on radio.
3. Release the "PS" key.
Remember, when you reset the microprosser, you will lose ALL memory channels and phone numbers. So
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write everthing down first.
Your radio should now tx from 220Mhz to 229.995.
D8 D12 D11 D10 D9
0
X
0
X
X
Ben
IC 3
+-----------------------+
|
|
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+-----------------------+
WB8LGH
Dip Switch settings for the Kenwood TR-2500/3500.
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
111111
71.9
111101
74.4
111011
77.0
111100
79.7
110111
82.5
111001
85.4
110011
88.5
111000
91.5
101111
94.8
110101
100.0
110100
103.5
110001
107.2
110000
110.9
101101
114.8
101100
118.8
101001
123.0
101000
127.3
100101
131.8
100100
136.5
100001
141.3
100000
146.2
011101
151.4
001100
156.7
011001
162.2
011000
167.9
010101
173.8
010100
179.9
010001
186.2
010000
192.8
001101
203.5
001100
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210.7
218.1
225.7
233.6
241.8
250.3
001001
001000
000101
000100
000001
000000
73s from Alan
N6QOG @ K6RAU.#NOCAL.CA.USA.NA.
The following original source is Unknown, to me.
Author: Bo (W7RTK) - [email protected]
First, my radio's serial is 8,080,XXX so if your radio is close, it
should work.
This radio is the big brother to the Kenwood TM 2530a except it xmitts
from 220Mhz to 225Mhz out of the box. I will show you how to make it TX
from 220Mhz to 229.995Mhz...
1.With the radio upside down and the face facing you, remove bottom screws.
2.Remove the bottom panel and locate the control unit number X53-1440-XX
3.Locate the big chip marked above it as IC 3 (see illustration below)
4.Just to the left of IC3, you will see a row of diodes D9, D10, D11,
D12 and D8. D9, D10 and D12 have already been removed from factory in
my radio.
5.Cut diodes D8 and D11.
6.After cutting diodes, reassemble the radio, and then you must reset
the microprocessor or the mod will not take effect.
Here are the steps,
1.With the radio off, press and hold the "PS" key.
2.Turn on radio.
3.Release the "PS" key.
Remember, when you reset the microprocessor, you will lose ALL memory
channels and phone numbers. So write everything down first.
Your radio should now tx from 220Mhz to 229.995.
IC
3
D8 D12 D11 D10 D9
0 X 0 X X
+----------------------+
|
|
|
|
+----------------------+
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