TM701A TM-701A REPEATER CROSS-BAND MODIFICATION (REVISED) Perform the following modifications to allow the TM-701A to operate in the repeater cross-band mode. MODIFICATION: 1. Disconnect the power supply and antenna. 2. Remove the top and bottom covers (12 screws). Disconnect the speaker wire from the transceiver. 3. Locate the green jumper wire show in figure 1. Using a sharp pair of wire cutters, cut the jumper in half.(green jumper) CAUTION: Cutting the green jumper allows the TM-701A to transmit from 142 to 151.995 MHZ. Protect your license by only using frequencies that you are authorized to transmit on. 4. Solder a jumper wire to the foil side of the TX-RX board as shown in figure 2. 5. Assemble the transceiver by reversing steps 1 -2. 6. Reset the microprocessor by holding in the MR key as the power is turned on. The repeater cross-band operation allows the TM-701a to receive on one band and re-transmit the signal on the other band. The TM-701a alternately displays the two bands until a signal is received. The transceiver will then display the band that is re-transmitting the signal. The SHIFT function cannot be used during the repeater cross- band operation. If the TONE or CTCSS function is required, only one ETA tone can be used for the two bands. TM701A.2 OPERATING PROCEDURE 1. Select the operating frequencies for both bands. 2. Set the squelch control to the threshold point. The TM-701a will transmit in the repeater cross-band mode if the squelch control is set too low or a signal is received. 3. Place the transceiver in the duplex mode (F + DUP). 4. Press the F key for longer than one second. The F indicator will flash. 5. Press the LOW key. The transceiver will now enter the repeater cross-band mode of operation. 6. To cancel the operation and return to the VFO mode, press the VFO key. Figure 2 rear of radio ------------------------------------------------------ ! ! ! ! ! o ! ! o ! ! o ! ! o ! ! o o ! ! o o ! ! o o ! ! o o ! ! o o ! ! __add__________Xo ! ! i o ! ! i o ! ! i ! ! i ooooooooooooooooooooooooooooooo ! ! i ! ! -------i ! ! i ! ! Xo@o ! ! ! ! ooooooooooooooo ! ! oooooooooooooooooooo ! _____________________________________________________ mic plug (radio bottom) (Jumper wire from X to X) FILE NAME: TM701A.002 @ VE3EUK REQMOD Subject: Kenwood TM701A mods From: chris@hplvli.HP.COM (Chris Kelly) Date: 24 Jul 89 15:35:10 GMT The TM-701 has a green loop of wire protruding from the front panel PC board into the main area of the radio. Clip this wire to gain TX up to 151.995 MHZ. 73 de WD5IBS лллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллл TM701 Hints... I've added the mods contained in TM701A.1, 2, and 3. They all work just like the mod file says. However, the descriptions in the file are not all that obvious to follow inside the radio. Here are some hints to make the implementation of the mods easier for you. "GREEN WIRE" Mod: This one is very easy. When you remove the top cover, ћяє§you will see it looped and sticking out on the front left side. Just clip it. "X-BAND REPEATER JUMPER": although the "figure 2" included with the mod file is pretty clear, some additional definition may help you. The "@" in the figure from which the jumper originates is actually a chip resistor. The jumper goes from the left side of that chip resistor to the third pad on the line of pads (which is a connector on the other side of the board). "EXTENDED VHF/UHF" The mod describes adding diodes D207 and D209. There is no silk screen showing these diodes on the board (at least in my copy of the radio). Their position is less than obvious. Looking at the foil side of the PCB, you will find the positions directly behind S209 and S207. You will notice two small pads directly behind S205 which do not have holes drilled in them. The diode goes between these two pads (D209). It takes a very fine soldering iron tip. Also, it is much easier if you pre-form the leads of the diode. The position of D207 is even less obvious. Again, its location is directly behind the switch (S209). The top pad is actually TWO square pads which have a trace between them. The bottom pad is directly below the pair and in the middle...it is NOT directly below either of the two. The diode goes between the pair of pads and the bottom pad. All are square. Again pre-form the leads and use a small iron. Also make sure that the diode leads don't short to any other pads. Good luck. Take your time and be patient. -KC9C @ KG6XX лллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллллл Msg Nr. : 33444 Da : EA5SP Per : ALL @WW Tipo/status : B$ Data/ora : 0819/0103 Dimensione : 4021 Titolo : Alcune modifiche per il TM 701 . Bid (Mid) : 2183_EA5FDS Hello my name is Juan, this text talk about the mods for transceivers of Ham Radio... I hope you interest this... If you need mods for others tranceivers, ask me.... THANKS EA5SP.EA5FDS.EAV.ESP.EU.WW TM-701A REPEATER CROSS-BAND MODIFICATION (REVISED) This Mod is from KENWOOD Perform The following modification to allow the TM-701A to operate in the repeater cross-band mose. MODIFICATION: 1. Disconnect the power supply and antenna. 2. Remove the top and bottom covers (12 screws). Disconnect the speaker wire from the transceiver. 3. Locate the green jumper wire shown in figure 1. Using a sharp pair of wire cutters, cut the jumper in half. ______ ______________ | |_____ | TOP <|---- Green Jumper | | | | | Heat sink | | | | | \ / FIGURE 1 CATUION: Cutting the green jumper allows the TM-701A to transmit from 142 to 151.995 MHz. Protect your license by only using frequencies that you are authorized to transmit on. 4. Solder a jumper wire to the foil side of the TX-RX board as shown in Figure 2. ______ ^ __| |________|________________ | Display side | | X ...... | X = Screw | X ...... | | - ----| | | .............. | <---------- ADD Jumper . | Pin #3 :____________| : FIGURE 2 5. Assemble the transceiver by reversing steps 1-2. 6. Reset the microprocessor by holding in the MR key as the power is turned on. The repeater cross-band operation allows the TM-701A to receive on one band and re-transmit the signal on the other band. The TM-701A alternately displays the two bands until a signal is received. The transceiver will then display the band that is re-transmitting the signal. The shift function cannot be used during the repeater cross-band operation. If the TONE or CTCSS function is required, only one EIA tone can be used for the two bands. OPERATING PROCEDURE: 1. Select the operating frequencies for both bands. 2. Set the squelch control to the threshold point. The TM-701A will transmit in the repeater cross-band mode if the squelch control is set too low or a signal is received. 3. Place the transceiver in the duplex mode (F + DUP). 4. Press the F key for longer than one second. The F indicator will flash. 5. Press the LOW key. The transceiver will now enter the repeater cross-band mode of operation. 6. To cancel the operation and return to the VFO mode, press the VFO key. 73's From EA5SP Op: Juan...... EA5SP.EA5FDS.EAV.ESP.EU.WW ========================================================================= From: "SURESH KAGOO (N9GSA)" Subject: TM701A CROSSBAND MOD TM-701A REPEATER CROSS-BAND MODIFICATION (REVISED) This Mod is from KENWOOD Perform The following modification to allow the TM-701A to operate in the repeater cross-band mose. MODIFICATION: 1. Disconnect the power supply and antenna. 2. Remove the top and bottom covers (12 screws). Disconnect the speaker wire from the transceiver. 3. Locate the green jumper wire shown in figure 1. Using a sharp pair of wire cutters, cut the jumper in half. ______ ______________ | |_____ | TOP <|---- Green Jumper | | | | | Heat sink | | | | | \ / FIGURE 1 CAUTION: Cutting the green jumper allows the TM-701A to transmit from 142 to 151.995 MHz. Protect your license by only using frequencies that you are authorized to transmit on. 4. Solder a jumper wire to the foil side of the TX-RX board as shown in Figure 2. ______ ^ __| |________|________________ | Display side | | X ...... | X = Screw | X ...... | | - ----| | | .............. | <---------- ADD Jumper . | Pin #3 :____________| : FIGURE 2 5. Assemble the transceiver by reversing steps 1-2. 6. Reset the microprocessor by holding in the MR key as the power is turned on. The repeater cross-band operation allows the TM-701A to receive on one band and re-transmit the signal on the other band. The TM-701A alternately displays the two bands until a signal is received. The transceiver will then display the band that is re-transmitting the signal. The shift function cannot be used during the repeater cross-band operation. If the TONE or CTCSS function is required, only one EIA tone can be used for the two bands. OPERATING PROCEDURE: 1. Select the operating frequencies for both bands. 2. Set the squelch control to the threshold point. The TM-701A will transmit in the repeater cross-band mode if the squelch control is set too low or a signal is received. 3. Place the transceiver in the duplex mode (F + DUP). 4. Press the F key for longer than one second. The F indicator will flash. 5. Press the LOW key. The transceiver will now enter the repeater cross-band mode of operation. 6. To cancel the operation and return to the VFO mode, press the VFO key. ============================================================================ Subject: Kenwood TM701A mods From: chris@hplvli.HP.COM (Chris Kelly) Date: 24 Jul 89 15:35:10 GMT The TM-701 has a green loop of wire protruding from the front panel PC board into the main area of the radio. Clip this wire to gain TX up to 151.995 MHZ. 73 de WD5IBS ============================================================================