Modifications for the Kenwood TM-D700

Kenwood - TM-D700


 

KENWOOD TM-D700A Extended TX MOD (easy 3 steps)
TM-D700 CAP/MARS
Kenwood TM-D700A service mode
TM-D700A/E Cross band repeat
Repeater functions. U.S.A. / Canada only
Enable Cross band Repeater Function TM-D700E Version
Update for the Kenwood TM-D700A/E Deviation level
Demonstration mode for TM-D700
TM-D700A MC53-DM MIC PTT Spring tension MOD

 
KENWOOD TM-D700A Extended TX MOD (easy 3 steps)  
     

 

Just received my new rig, neither the supplier nor Kenwood had the mods available to date.

  1. Remove the bottom cover, 5 screws (not the speaker side).
  2. Locate and remove "W601" (chip resistor) and "W602" (green wire). They are located within 2 inches of the optional VS-3 voice synthesizer board.
  3. Reassemble radio and after power-up, press the reset switch on the front of radio.

Here is your new TRANSMIT range

136.000	- 174.995
400.000	- 469.995

This is the RECEIVE range (mode selected).

118.000	-  135.995
136.000	-  199.995
200.000	-  299.995
300.000	-  399.995
400.000	-  523.995
800.000	-  823.990
849.000	-  869.990
894.000	-  913.990
934.000	- 1299.990

 

  TM-D700 CAP/MARS  
     

To modify the transmitter to cover 142 - 151.995 Mhz and 420-449.995 Mhz, perform the following steps:
  1. MOST IMPORTANT - this mod will do a reset on your radio and erase ALL of your settings (memory, APRS, menus, etc.). Use the computer program to pull all of the settings out BEFORE you go any further. Or if no computer, a very large tablet. This radio has many many programmable features.

     
  2. Turn off the radio and disconnect the power

     
  3. Remove the five screws from bottom cover (not the side with the speaker).

     
  4. Remove the bottom cover. It may take a little prying with a small screwdriver.

    REMEMBER if you haven't saved your settings, all will be lost if you proceed beyond this point.

     
  5. Cut ONLY the famous Kenwood green wire, located near the voice synthesizer board connector. The green wire ties two PC board lands together and is about 1/2" long. Make sure the ends can't short against anything.

     
  6. Reinstall the bottom cover.

     
  7. Reapply power and turn the radio on (it will automatically reset).

     
  8. Use the computer program to reinstall all of your operating parameters. I found that the load ALL function did not seem to do everything. Try the load MEMORY and MENU selections too. Or prepare to spend a whole bunch of time re-entering all of your parameters that you wrote down in step 1.


 

  Kenwood TM-D700A service mode  
     
The TM-D700 A/E has a service mode that lets you adjust many parameters of the radio for both bands. The setup is easy, and the following things can be adjusted:

Squelch open sensitivity
S meter calibration
Transmission output power (adjust at lower limit frequency, center frequency, upper frequency of both bands)
Transmission deviation
DCS modulation balance
Tone deviation
DCS deviation

To get into the mode, short pins 3 and 6 of the 6 pin data radio terminal.

   
                      

The center slot for the plastic tab in the connector is on top of this. Pin 6 is on the upper left, pin 3 is on the right middle. With the radio powered off, short these two pins together.

Now, hold down the F and the TONE key and turn the power ON. The radio will come up with 144.000 and some data on the right side. The menus will look like they do when you're in the MNU. Use the left and right buttons to change things.

Using the <- and -> selections on the menu, you can scroll through the options. According to this spec sheet here, the radio can be set to 60W on 2 meters and 42W on 440. ALL ADJUSTMENTS ARE MADE FOR EACH BAND SEPARATELY.

Be sure to do power adjustment into a 50 ohm dummy load!

Do not worry if you don't recognize these menu names. Many of them are graphical on the bottom that change with the mode you're in.

VFO, MR, ENCODER (the left wheel), MHZ, and BAND SEL (the buttons you push to change bands) all function in this mode.

To adjust squelch sensitivity, put the desired signal on the antenna connector and press SET. (menu item on the bottom.)

To adjust the S meter, put a signal you want for S1 on the connector and press the S1 button on the bottom. Same goes for S7.

Output power is adjusted by selecting FREQ1,2, or 3 which sets different frequencies. Key down the mic and transmit into the dummy load. Turn the encoder left or right to adjust output power. Press LOW to adjust for low, medium, and high power. (make high power 5W and low power 50W, impress your friends!)

Transmission deviation is adjusted with the <- and -> buttons. There's a MAX DEV setting if you want to bleed over to adjacent frequencies. (piss off your friends!) Press the SET key to set it.

DCS modulation balance is set with <- and -> and by pressing the SET key.

Same goes for TONE deviation and DCS deviation.

Enjoy!

 

  TM-D700A/E Cross band repeat  
     
Modification procedures for models to other Type (Transmitter band expansion, ext)

Set a desired destination by adding or deleting three chip jumpers (R659, R661, R662) and a lead jumper (W602) on the foil side of the TX-RX unit (X57-586X-XX). (Refer to the attached tables 2 to 19 for details.) [Didn't get a copy of those].

  1. Remove R659 and W062 to extend the transmitting band.

     
  2. Remove R675 to modify the channel display mode. [Shows channel instead of frequency?]

     
  3. Remove R674 to modify the repeater.

(Repeater in TM-D700A to U.S.A./Canada has already been modified before factory)

Another note not from Kenwood.
I have looked at the board and cannot find R674, however there are tow chip resistors (0 ohm?) labeled REPEATER and CH. Ay a guess these are R674 and R675 respectively. I may try to remove REPEATERS later and watch the results.

Usual caveats in place, if it breaks because of these mods, you are on your own.

 

  Repeater functions. U.S.A. / Canada only  
     
This transceiver is capable of receiving signals on one band and retransmitting signals on the other band. This function repeats signals originating from one band, using the other band. For example, a signal received on band A (VHF) is retransmitted on band B (UHF). Similarly, a signal received on band B (UHF) is retransmitted on band A (VHF).

Access Menu 1-7-6 (REPEATER) and select Locked" band Repeater or Cross-band Repeater. The default is "OFF".

 

Looked-band Repeater

The transceiver always uses the same band to receive or transmit a signal as a repeater. Belore accessing Menu 1-7-6, select one band as the TX band and the en other band as the control band.

Cross-band Repeater

If receiving a signal on the TX band, the transceiver switches the current RX only band to the TX band. Before accessing Menu 1-7-6, select the same band as the TX and control bands.

82

If necessary, you can cause this transceiver to remain in the transmit mode for 500 ms after signals drop. Access Menu 1-7-5 (REPEATER HOLD) and select "ON".

 

Note:

  • You cannot activate tbc Repeater function after recalling the same frequency band (VHF or UHF) on band A and B, or while blanking a band display.
  • Activating the Repeater function switches OFF Automatic Band Change (A.B.C.) automatic Simplex Check (ASC).
  • The Time-Out Timer is locked at 3 minutes.
  • After activating the Repeater function, you cannot access Menu Nos. other than 1-7-5 and 1-7-6.


 

  Enable Cross band Repeater Function TM-D700E Version  
     
To enable cross band repeater function in the TM-D700E Remove 0 ohm resistor above the word repter written on the pcb. it works fine here.

Repeater jumper

 

  Update for the Kenwood TM-D700A/E Deviation level  
     
To adjust the Transmission deviation level you need to get into the service mode.

Then scroll through the options to the deviation section.
Then press and hold the Mic (PTT) in then turn the tuning control to select the deviation you want. Then Press the SET key to set it.

Both VHF/UHF need to be adjust separately.

 

  Demonstration mode for TM-D700  
     
To see a demonstration mode press and hold the (F) Key and Turn the radio on

Stop the demonstration Turn radio off then press (F) Key and Turn the radio on

 

  TM-D700A MC53-DM MIC PTT Spring tension MOD  
     
This reduces the pressure required to key the mic to about half or less. (Sorry I do not have any measuring instruments). Perform at your own risk.
  1. Turn off radio. Leave Mic connected to radio and radio connected to power. This will reduce the chances of static discharge blowing the IC behind the cover. Ground yourself.

     
  2. Remove the 3 screws from the back of the mic and gently remove cover. Inside the large PTT housing you will notice a spring with BLACK foam in it as well as a piece of RED foam that comes in contact with the actual PTT micro switch.

     
  3. From the bottom of the PTT pull upwards until the PTT housing comes out of the MIC housing. Take care not to damage the RED foam.

     
  4. Pull the spring with the BLACK foam out of the PTT housing. Store in a safe place as you may not like the difference it makes.

     
  5. Carefully reinsert the PTT housing, again taking care not to damage the RED foam.

     
  6. Replace the rear cover. DO NOT OVER TIGHTEN SCREWS. Test PTT. Test APRS messaging from Keypad. This will verify the IC has not been damaged.

Hope it works for you!