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KB2LJJ Radio Mods Database ® www.r6-ru4montesecchieta.it Free mods IZ5CCV 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. http://www.kb2ljj.com/data/kenwood/tm-3530.htm (1 di 6)01/09/2009 0.01.14 KB2LJJ Radio Mods Database 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. http://www.kb2ljj.com/data/kenwood/tm-3530.htm (2 di 6)01/09/2009 0.01.14 KB2LJJ Radio Mods Database 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 http://www.kb2ljj.com/data/kenwood/tm-3530.htm (3 di 6)01/09/2009 0.01.14 KB2LJJ Radio Mods Database 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 +-----------------------+ | | | | +-----------------------+ 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 http://www.kb2ljj.com/data/kenwood/tm-3530.htm (4 di 6)01/09/2009 0.01.14 KB2LJJ Radio Mods Database 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 +----------------------+ | | | | +----------------------+ http://www.kb2ljj.com/data/kenwood/tm-3530.htm (5 di 6)01/09/2009 0.01.14 KB2LJJ Radio Mods Database Home | Info | CT1APV | About | Forum | Guest Book | APRs | Mods | | Uploads | Help | Software | Email | http://www.kb2ljj.com/data/kenwood/tm-3530.htm (6 di 6)01/09/2009 0.01.14