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- Path: taco!gatech!prism!ccoprfm
- From: ccoprfm@prism.gatech.EDU (Monte Freeman)
- Newsgroups: rec.radio.amateur.misc
- Subject: Kenwood TM-741 Mods. PLEASE READ.
- Message-ID: <69423@hydra.gatech.EDU>
- Date: 30 Sep 92 07:39:27 GMT
- Organization: Georgia Institute of Technology
- Lines: 531
-
-
- Hello,
-
- What follows is the collection of Kenwood TM-741/732 mods that I have
- collected over time. I'd like to hear from anyone who has additions and/or
- corrections to this list.
-
- Some time back someone posted a message asking if there would be any interest
- in creating a kind of 'super-manual' for the 741. I replied to this person, but
- never heard back from him. If I get enough interest; I may consider doing a
- project like this myself.
-
- If you have any mods, tips, owner's manual corrections, or other information
- that you think would be useful in a 'super-manual' like this, please let me
- know or forward a copy of the information to me. Also, if you're interested in
- helping out with creating the manual, please let me know.
-
- Here's my list of mods. Some of them I've made to my readio. Some I have
- not. Please let me know what is missing or needs changing:
-
-
-
-
- MODIFICATION MATRIX FOR TM-732A
-
- Resistors TX Ranges STD Has
- M 22 21 20 19 VHF UHF SHIFT 800 Remarks
-
- K1 0 1 0 1 144-148 438-450 .6/5 Std. US Version
- K2 1 1 0 1 144-148 438-470 .6/5 x US After green wire cut
- K3 1 0 0 1 142-152 420-470 .6/5 x MARS/CAP Mod
- K4 0 1 1 0 136-174 410-470 .6/5 x All Band Mod
- M1 0 0 0 0 144-148 430-440 .6/5 Generic Int'l Model
- M2 0 1 0 0 136-174 410-470 .6/5 x All Band Int'l (430 default)
- E1 0 0 1 0 144-146 430-440 .6/(1.6) Std Europe Model
- E2 1 0 1 0 136-174 432-438 .6/1.6 x Denmark
- E3 0 0 1 1 144-146 410-470 .6/(1.6) x
- E4 1 1 0 0 144-146 430-440 .6/(1.6) x
- E5 1 0 1 1 136-174 410-470 .6/(1.6) x Europe All Band
- C1 0 0 0 1 136-174 340-512 5.7/10 China Model
-
- 0 = Resistor IN 1 = Resistor OUT
-
- Notes:
-
- 1. All "resistors" O ohms (wire jumper OK)
- 2. Green wire is equivalent to R22 - present in K1 model
- 3. 0 = resistor present, 1 = resistor absent
- 4. Standard shifts in MHz. Those listed as (1.6) also do -7.6
- 5. Codes not listed are used in Japan version, special CPU required
- 6. M column is factory MODE number
- 7. K2 Mod includes 410-470 RECEIVE and enables CLONING features
-
- To perform any of these mods, remove the back cover from the remote
- head unit. Resistor numbers clearly marked on board along top.
-
-
- 800 MHZ RECEIVE
-
- To enable 800 receive, switch to UHF VFO (not available in UxU),
- press and hold MHZ button until 800.000 appears.
-
- A capacitor must be added (C348) to enable the 800 receiver.
- To add, remove UHF transciever board and next to the pad of pin 1
- of IC-202 (on the foil side), add a 2.2 pF chip capacitor.
- A wire can be used instead of the capacitor but sensitivity will
- be reduced. (See schematic diagram for reason).
-
-
- HARD-WIRE CLONING (Works in all confguration modes)
-
- This procedure allows you to clone the entire memory of a "master"
- transciever into the memory of a "slave" transciever.
-
- First, construct an RJ-45 Jumper cable as follows:
-
- ------| |------
- UP ----------------------------- UP Note that PTT and DOWN
- E ----------------------------- E are crossed end-to-end
- PTT ----------------------------- DOWN
- DOWN ----------------------------- PTT
- ------| |------
-
- For hacker's reference: UP=CLK, PTT=SO/, DOWN=SI
-
- 1. Configure the master transciever's memories as desired.
-
- 2. Switch power OFF, hold down F and MHZ keys and switch
- power back on while holding keys. Display will show "CLonE".
-
- 3. Set the slave transciever in the clone mode (as in step 2).
-
- 4. Plug the cable into the two radios (which end does not matter).
-
- 5. Press the CALL button on the master. When "End" is displayed,
- operation is complete.
-
-
- ON AIR CLONING (Does not work in K1 or E1 Mod modes)
-
- This procedure allows you to clone a second transciever as above,
- over the air. The data is transmitted automatically using DTMF
- tones. During transmission (which is one-way only), the master
- will automatically switch to LOW power. To be legal, use only a
- UHF cloning frequency.
-
- This procedure is not enabled in the stock transciever. At a
- minimum, you must cut the green wire to make it work.
-
- 1. Configure master transciever's memories as desired. Select
- a UHF simplex transmit frequency and set PTT to UHF (will work on
- VHF but is not recommended).
-
- 2. Switch the power OFF. Press and hold the CALL and DTSS buttons
- and turn the power back ON. "CLonE" appears in display.
-
- 3. Set the receive frequency on the slave transciever the same
- as that of the master. Turn power OFF, hold down CALL and DTSS
- keys and turn power ON. "CLonE" appears in display.
-
- 4. Press the PTT on the master's microphone. Data transmission
- will begin. In case of a receive error, the slave transciever will
- display "Err". When the procedure is complete, both radios will
- display "End".
-
-
-
- THE FOLLOWING FEATURES ARE UNVERIFIED, SO
- YOU MAY NEED TO EXPERIMENT FOR YOURSELF
-
- PAGING ANSWERBACK (Does not work in K1 or E1 Mod modes)
-
- The exact operation of this feature is unclear but the following
- description has been given:
-
- 1. To enable, hold down the F key and press the TONE key.
-
- 2. Do disable, repeat step 1
-
- When enabled, documentation says: "If a matching code is received
- and the other transciever is no longer BUSY, the code of the local
- transciever is sent to the other transciever. The answerback
- function then turns off."
-
-
- MEMORY RECOVERY (requires DTMF microphone)
-
- (Documentation of this "feature" is difficult to comprehend but
- perhaps someone will figure out what it does.. I suspect that
- "RECOVERY" refers to returning the memories to their original
- state after changing the split memory layout.)
-
- 1. Hold down F and C.SEL, turn on power
-
- 2. Press D, followed by 7 on the microphone. "Inspection Mode"
- is now enabled.
-
- 3. To cancel, press and hold F and then C.SEL
-
- "Note: Before recovery, the memory channels must be returned to
- the previous state (number of split memories, etc.)."
-
- -------------------------------------------------------------------------------
-
- MODIFICATION COLLECTION FOR THE KENWOOD TM-741A TRI-BANDER
- ==========================================================
-
-
- TM-741A/E FREQUENCY EXTENSION
- =============================
-
-
- Phase 1
- -------
-
- a) Slide the release knob on the front panel to the right
- and remove the panel (be careful with the cable between
- the panel and the main unit.)
- b) Cut the green wire located in the left side (tape the
- bare ends of the wire to prevent shorts.)
- c) Switch the power on (a melody sounds to confirm the
- change.)
-
-
- Phase 2
- -------
-
- a) Unplug the connectors of the cable between the panel
- and the main unit.
- b) Remove the two screws on the rear of the panel and open
- the rear of the case.
- c) On the left side of the lithium battery there are four
- jumpers marked R54, R55, R56 and R57 corresponding
- respectively to b0, b1, b2 and b3 bits described below.
-
- Set the four bits as required for your country:
-
- - European Countries:
- mode $05
-
- b3 = 0
- b2 = 1
- b1 = 0
- b0 = 1
-
- - USA, Canada and Asia:
- mode $03
-
- b3 = 0
- b2 = 0
- b1 = 1
- b0 = 1
-
- WARNING: 0 => jumper set, 1 => no jumper.
-
- d) Refit the rear of the case by reversing the order of
- disassembly.
-
- Frequency range after modification
- ----------------------------------
-
- |--------------------------------------------------------------|
- | || rx range || tx range || SHIFT |
- | unit || min | max || min | max || EUROPE | USA CAN ASIA |
- |------||------------------------||----------------------------|
- | 28 || 18 | 54 || 26 | 45 || +/- 100 KHz | iden |
- | 50 || 40 | 90 || 46 | 76 || +/- 1 MHz | iden |
- | 144 || 118 | 174 || 136 | 174 || +/- 600 KHz | iden |
- | 220 || 215 | 260 || 215 | 235 || +/- 1.6 MHz | iden |
- | 430 || 410 | 470 || 410 | 470 || +/-1.6,-7.6 | +/- 5 MHz |
- | 1200 ||1100 |1400 ||1100 |1400 || +35, -6 MHz | +/-12,-20MHz |
- |--------------------------------------------------------------|
-
-
- TM-741A/E AM RECEPTION WITH 28 AND 50 MHZ UNIT
- ==============================================
-
- a) Press the [F] key, then press [BELL] key within
- ten seconds. An A is displayed at the hundred-MHz
- position to indicate AM mode.
-
- b) To return to FM mode press the [F] again, then
- press the [BELL] within ten seconds.
-
-
- TM-741A/E 900 MHz BAND RECEPTION WITH 430 MHZ UNIT
- ==================================================
-
- Band change
- -----------
-
- To change to the 900-MHz band, select the 430-MHz
- band, then press and hold down the [MHZ] key for at
- least a second. Now 850.000 (initial setting) is
- displayed.
-
- To return to the 430-MHz band, press the [MHz] key
- again for at least a second.
-
- Adding a secondary 900-MHz dedicated antenna in the 430-MHZ unit
- ----------------------------------------------------------------
-
- a) Remove the power supply cable from the power
- supply or battery.
-
- b) Remove the 430-MHz band unit with care.
- For removal procedure see the INSTRUCTION MANUAL -
- UNIT INSTALLATION, reversing the order of the
- procedure and... using the brain!
-
- c) Remove the shield plate (12 screws.)
-
- d) Solder a coaxial cable (0.8 D) to the input
- side of IC9 (center is alligned with the IC9,
- ground at right side.)
-
- e) Pass the cable throungh the notch and install
- the shield plate.
-
- f) Reassemble the main unit.
-
-
- TM-741A/E MEMORY CHANNEL DOUBLING
- =================================
-
- Each band can be switched to the normal memory
- (100 channels) and rear memory (100 channels). Each
- band can contain 200 channels and... yes, a total of
- 600 channels can be used for three bands!
-
- SORRY! This function can be enabled only by extending
- the receive frequency (see bulletin #1 of this
- FREQUENCYEXTENSIONSNEVERENDHISTORY.)
-
- To switch the memory, hold down the [F] key and
- press the [REV] key:
-
- Normal Memory (100 ch) <--> Rear Memory (100 ch)
-
- The functions of the rear memory are the same as the
- normal memory, but memory channels are displayed as
- follows (rather than 01 to 00):
-
- A1 - b0 == 01 - 10 b1 - c0 == 11 - 20
- c1 - d0 == 21 - 30 d1 - E0 == 31 - 40
- E1 - F0 == 41 - 50 F1 - G0 == 51 - 60
- G1 - h0 == 61 - 70 h1 - i0 == 71 - 80
- i1 - J0 == 81 - 90 J1 - AA == 91 -100
-
-
- TM-741A/E EXTENDED PAGING FUNCTIONS
- ===================================
-
- Preliminary
- -----------
-
- Cut the frequency extension jumper as described in Phase 1
- of the bulletin #1.
-
- Answerback function
- -------------------
-
- Hidden function of the paging function.
- If the answerback function is on, the code of the local
- transceiver is automatically transmitted to the other
- transceiver when the correct code is received to confirm
- the code has been received.
-
- OPERATION After the correct code is received, if there is
- no BUSY signal, the code of the local transceiver is
- automatically transmitted to the other transceiver.
-
- ON/OFF To turn the answer-back on and off, hold down the
- [F] key and press then the [CALL] key.
-
-
- Automatic release function
- --------------------------
-
- Hidden function of the paging function.
-
- OPERATION If the automatic release function is on, paging is
- terminated automatically when transmission ends after
- a call is received.
-
- ON/OFF To turn the function on and off, hold down the
- [F] key and press then the [SHIFT] key.
-
-
- TM-741A/E DATE DISPLAY FORMAT
- =============================
-
-
- The normal date format is YEAR-MONTH-DAY. It can be
- changed to YEAR-DAY-MONTH.
-
- a) Remove the front panel and locate R60 and R61.
-
- b) Move R61 (that is below R60) to the left.
-
- c) Repack the front panel with care.
-
-
- TM-741A/E DC POWER DISPLAY
- ==========================
-
-
- Make the following change to display the SB line voltage
- on the memory channel section when the time is displayed.
-
- a) Remove the front panel and locate R60 and R61.
-
- b) Move R60 (that is above R61) to the left.
-
- c) Repack the front panel with care.
-
- Since the voltage of the SB line to the panel is displayed,
- it changes due to the loss caused by the wire and connector.
-
-
- TM-741A/E HEADLIGHT LINKAGE DIMMER
- ==================================
-
-
- Make the following change to reduce the dimmer level by one
- step when the headlight is turned on (d4 remain unchanged).
-
- a) Install DTC144EK on the panel printed circuit board
- (below R60 and R61).
-
- b) Connect the load from the ILUMI pin of the panel
- printed circuit board to the 12 V side (where 12 V is
- output when the light is turned on) of the position
- light of the car.
-
-
- TM-741A/E GAME MODE
- ===================
-
- Simple games, such as a roulette game and a shooting game,
- and music can be played using the frequency display.
-
- To enter game mode, hold down the [F] key and the [MUTE]
- key, and switch the power on.
-
- 1-2-3 is shown on the display. [BAND SEL A] selects Roulette,
- [BAND SEL B] selects Shooting, and [BAND SEL C] selects Music.
-
- To return to game selection mode, press the [VFO] key.
-
- To exit game mode, press the microphone key or switch power off.
-
-
- Roulette Game
- -------------
-
- * When the roulette game starts, the display shows [000],
- the transceiver enters the receive mode with the power on,
- and the three digits begin to run rapidly.
-
- * When the [MUTE] key is pressed, [000] on the display can be
- changed: [BAND SEL A] stop the leftmost digit, [BAND SEL B]
- stops the middle digit, and [BAND SEL C] stops the rightmost
- digit. Other keys are not accepted.
-
- * if the three digits match, the LED and illumination lamp flash
- and sound effects are produced.
-
- * if [123] is displayed, a fanfare sounds. If the [MUTE] key is
- pressed, game mode is exited and the transceiver functions
- normally.
-
-
- Shooting game
- -------------
-
- * When the shooting game starts, your score is shown in display
- section A, and cannon balls, target and remaining cannons
- are shown in display section C, strating from the left.
-
- * If the [LOW] key is pressed, the game starts. The "number"
- attacks from the left of display B. Take aim at the enemy
- "number" with the [TONE] key key, and shoot with the [MUTE]
- key. You win if 16 enemies are shot per screen. Thirty
- cannon balls can be used per screen. Each time you clear a
- screen, the speed increases. If eight screens are cleared,
- the first screen returns. The process is repeated.
-
- Music
- -----
-
- When the music feature is selected, [ENJOY SOUND PLAY] is
- displayed and the following tones can be produced:
-
- MR = A MUTE = F
- MHz = A# CSEL A = F#
- CALL = B BSEL A = G
- F = C CSEL B = G#
- BELL = C# BSEL B = A
- TONE = D CSEL C = A#
- REV = D# BSEL C = B
- DTSS = E
-
-
-
- DISPLAY TEST
-
- Hold down F and MHZ while turning on power. This activates the display
- test mode where all segments and indicators are lit. Note the "ACC"
- indicator at the lower right. ACC is not defined in the manual, however
- I saw it come on once one night after I started the car with the radio
- turned on. The display lit up ACC and the UHF frequency display showed
- some sort of HEX code (a ROM checksum maybe?).
-
-
- STRANGE TEST
-
- (WARNING: YOU MAY LOSE SOME SAVED MEMORY DATA)
-
- Hold down the F and MR keys while turning on power. The radio plays
- a wild sequence of tones and the displays go all crazy for several
- seconds. When it's done, everything seems normal except that the
- memory contents are reshuffled and some memories are duplicated.
- I can only speculate that this might be some sort of factory memory
- test...
-
- ---------------------------------------------------------------------
-
- UNDOCUMENTED TM-732A FEATURES
-
- CLONE MODE
-
- Hold down the F and MHZ keys while turning on power. The current
- control band will display CLonE. Pressing CALL initiates the data
- transfer, graphically illustrated by a moving S-METER display. No
- RF is transmitted during data transfer, instead it is assumed that
- the data is dumped out of the microphone port. Nothing more is
- known about this at this time.
-
-
- AM DETECTOR CONTROL
-
- The AM Detctor, which automatically comes on below 136 MHz, can be
- forced ON at any VHF frequency by pressing the F and MUTE keys
- while applying power. Radio continues to transmit FM but receives
- AM. Changing frequencies or memory channels will cancel the forced
- AM mode. This capability could be useful for listening to the
- USAF Thunderbirds which sometimes operate in the 143 MHZ band using AM.
-
-
-
- These are all of the mods that I currently have (I think). If anyone has
- any corrections or additions to this list, please let me know.
-
- I'd like to put together as complete a list of the mods for the TM-741 as I
- possibly can....
-
- Also, I've seen several references to the TM-732. Is this the same radio (as
- far as being able to do mods) as the TM-741? I can't seem to find any kind of
- a good description for the 732. Does anyone know of any mods for the 732 that
- will NOT work for the 741?
-
- Thanks,
-
-
-
- --
- Monte Freeman -- Operations Department / Information Technology
- Georgia Institute of Technology, Atlanta Georgia, 30332
- Internet: ccoprfm@prism.gatech.edu
- Bitnet: ccoprfm@gitvm1.bitnet
-
-