TM-732A Additional Features and Modifications

TM-732A Additional Features and Modifications

Table Of Contents

AM Detector Control
Paging Answerback
Memory Recovery
Cloning
Hard-Wire Cloning
On Air Cloning
Summary: All Band Mods
Modification Matrix
800 MHz. Receive

AM Detector Control

The AM detector, which automatically comes on below 136 MHz., can be forced ON at any VHF frequency by pressing the F and MUTE keys. Radio continues to transmit FM but receives FM. Pressing the F and MUTE keys again 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.

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.)."

Fred Lloyd, AA7BQ

Cloning

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.
  1. First, construct an RJ-45 Jumper cable as follows: 
    ------|                           |------
   UP ----------------------------- UP
    E ----------------------------- E
  PTT ----------------------------- DOWN
 DOWN ----------------------------- PTT
------|                           |------
    Note that PTT and DOWN are crossed end to end. For hacker's reference: UP=CLK, PTT=SO/, DOWN=SI

  2. Configure the master transciever's memories as desired.
  3. Switch power OFF, hold down F and MHZ keys and switch power back on while holding keys. Display will show "CLonE".
  4. Set the slave transciever in the clone mode (as in step 2).
  5. Plug the cable into the two radios (which end does not matter).
  6. 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".
DTMF signals will be automatically be transmitted over the air. The bottom signal strength meter will show the cloning progress..

Joel KD6ANG

Summary: All Band Mods

Modification Matrix

VHF Receive Range = 118-172 MHz. (118-136 MHz. AM)
UHF Receive Range = 410-477 MHz. (K2 MOD)
800 MHz. Receive Range = 800-1000MHz. (K2 MOD)
M6
R22
R21
R20
R19
 VHF
 UHF
 SHIFT4
 800
 Remarks
K1 0 1 0 1 144-148 438-450 .6/5 Std. US Version
K27 1 1 0 1 144-148 438-450 .6/5 x US After green wire cut2
K3 1 0 0 1 142-152 420-450 .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

M6
R22
R21
R20
R19
 VHF
 UHF
 SHIFT4
 800
 Remarks
M1 0 0 0 0 144-148 430-440 .6/5 Generic Int'l Model
C1 0 0 0 1 136-174 340-512 5.7/10 China Model
E1 0 0 1 0 144-146 430-440 .6/(1.6) Std Europe Model
E3 0 0 1 1 144-146 410-470 .6/(1.6)x
M2 0 1 0 0 136-174 410-470 .6/5 x All Band Int'l (430 default)
K1 0 1 0 1 144-148 438-450 .6/5 Std. US Version
K4 0 1 1 0 136-174 410-470 .6/5 x All Band Mod
5 0 1 1 1
5 1 0 0 0
K3 1 0 0 1 142-152 420-450 .6/5 x MARS/CAP Mod
E2 1 0 1 0 136-174 432-438 .6/1.6 x Denmark
E5 1 0 1 1 136-174 410-470 .6/(1.6)x Europe All Band
E4 1 1 0 0 144-146 430-440 .6/(1.6)x
K27 1 1 0 1 144-148 438-450 .6/5 x US After green wire cut2
5 1 1 1 0
5 1 1 1 1
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 VHF/UHF. 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 pF chip capacitor. A wire can be used instead of the capacitor but sensitivity will be reduced. (See schematic diagram for reason).