Modifications for the Kenwood TS-50

Picture(s) of Kenwood - TS-50

19-07-1998 TS50 FIX: LCD display dark English language
19-07-1998 TS50<-->AT50 communication English language
19-07-1998 TS-50 Power Mod for QRP English language
19-07-1998 TX Coverage mod TS-50 English language
23-01-1999 CAT control for TS-50S English language
14-02-1999 Important note to 0-30 MHz TRX mods English language
19-01-2000 New version. General TX for TS-50 English language
22-04-2000 TS-50S Lithium battery replacement notes English language
23-04-2000 TS-50S "Hello" displayed during TX English language
23-04-2000 TS-50S Antenna lead wire English language
23-04-2000 TS-50S Mechanical noise from final unit English language
27-01-2001 TS-50 Modification Full time "Double-Zero" English language
16-06-2001 TX 0-30 MHz for the new TS-50 (May 2001) English language
08-08-2001 TS-50 High-Power-Modification English language
12-10-2001 Kenwood TS-50S Wideband TX & double zero readout English language

19-07-1998
TS50 FIX: LCD display dark

From: DJ7UA @ DB0QS.#NRW.DEU.EU (Mario)

Problem:
No display illumination, LEDs On Air, AT TUNE no function The menu item 2 has no effect, display keeps always dark.
All other functions normal.

Possible reason:
Bad contact LCD Assy for 5V line to R9, R10 and IC5.
Power on the TS50 and check voltage at R9/R10.
If voltage is 0V, but display readout is active, the reason might be as discribed.

Measurement to fix it:
Look for the small hole near R9 at the LCD Assy, component side view, where the contact between the two sides of the LCD Assy is located.
If you have no service manual:
This is the side oriented to the front side of the device.
R9/R10 are located close to the two LEDs.
Take a small size needle to pick through the contact hole to encrease the diameter.
Make a contact between the two layers by soldering a piece of wire across the hole.
Check the 5V at R9/R10.
73, Mario
DJ7UA

This modification is read 640 times.

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19-07-1998
TS50<-->AT50 communication

 +-------------------------------------------------+
       TS-50 <--> AT-50      Communication        
 +-------------------------------------------------
         as measured/discovered by DF6KR          
         No guarantee for whatsoever....          
 +-------------------------------------------------+


Communication method:   Serial interface
Tranfer rate:           4800 bps
Synchronization:        Start-stop (Asynchronous)
Parity:                 None
Signal format:          TTL level (!)

                +---+
        +-------------------+
               +---+          1:  Ground
           1    2    3      2:  TT (TS50<--AT50)TTL!

 ACC     +---+ +---+ +---+    3:  TS (TS50-->AT50)TTL!
          4    5    6     4:  N.C.
         +---+       +---+    5:  ATG (signal ground)
        +-------------------+   6:  +13.8V from TS50
      Rear Panel Connector ACC

Timing:

1. at Power-on:
===============

    +------------------+ ++1         ++3++6
TT--+                  +---------------------->
    |                  |  |           | |
    |       1.45 sec---+  |           | |
    +--+                  ++2         +-+4,5
TS--+  +--------------------------------------->
       |                   |<- 600ms->|
    0  + 90ms               resume time       t

Signal:
       1         3              6
TT: ;;;;;0C;___0D01;__________0F11;
             2        4    5
TS: ________0C;_____0D01;0F11;____

1: Power on comm.
2: Power on answer
3: Auto on request
4: Auto resume finished
5: ok at50
6: ok answer ts50


2. DOWN-UP-Communication
========================

TT: 0E02;__________0F11;__   - UP from 1.8 to 3.5
TS: _____0E02;0F11;_______

same:
0E04;0E04;0F11;0F11;   UP 3.5 --> 7
0E05;0E05;0F11;0F11;   UP 7   --> 10
0E06;0E06;0F11;0F11;   UP 10  --> 14
0E07;0E07;0F11;0F11;   UP 14  --> 18
0E08;0E08;0F11;0F11;   UP 18  --> 21
0E09;0E09;0F11;0F11;   UP 21  --> 24.5
0E0B;0E0B;0F11;0F11;   UP 24.5--> 28
0E0C;0E0C;0F11;0F11;   UP 28  --> 29
0E01;0E01;0F11;0F11;   UP 29  --> 1.8

DOWNs
0E0C;0E0C;0F11;0F11;
0E0B;0E0B;0F11;0F11;
.
.
0E01;0E01;0F11;0F11;


TUNE:             0D03;0D03;0F41;0F41;
AUTO OFF (THRU):  0D00;0D00;
AUTO ON:          0D01;0D01;
tune error:       0d03;0d03;0F83;0F83;

This modification is read 1245 times.

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19-07-1998
TS-50 Power Mod for QRP

"Honey - I Shrunk the Rig"
by Bob Gobrick WA6ERB

No this is not an article about Kenwood shrinking their new TS-50 HF rig into a "CB" sized package, but the "shrinking" of the low power level on the TS-50 from 10 watts to 5 watts output in order to "officially" comply with the nationally recognized QRP power level for contest operation.

Prepare yourself before you remove any covers from the TS-50 - this is no Hallicrafters (feel a little dated) with 6L6's glowing in the inside. All components are surface mounted and to conserve space surface mounted subassemblies stand up at right angles all over the place. No place to work with that stubby tipped Weller soldering gun. But have no fear, this QRP mod is simple - you just need a screwdriver with a blade the size of a toothpick.

If you check the schematics you will see on the TX/RX board two potentiometers to set the Low 10 watt (pot VR15) and Medium 50 watt (pot VR16) power levels. The high power level is fixed at 100 watts by resistor R214. Our goal is to get to VR15 and set it for a 5 watt output.

First remove the top cover, set aside speaker and remove the latched speaker bracket (gives you better operating room). Locate two teeny-weeny pots next to IF filter module in the middle of the TX/RX board. The pot closest to the front panel is VR15 (low power adjust) and the one closest to the back of the rig is VR16 (medium power adjust) - the pots are somewhat marked on the PC board. Hook up a QRP wattmeter, dummy load and power and while in th low power mode adjust the pot (I used a flat blade calibration tool I had around) for 5 watts. That's it. You may notice that you can crank the pot all the way down to 0 watts so set where you want. I suspect the medium power adjustment with VR16 can also go to zero so maybe you can go QRPp by setting the low power pot for 999 mw and the medium power pot for 5 watt.

PS: Kenwood Service cautioned that their automatic antenna tuner requires 10 watts to actuate so this adjustment may affect that operation. You may want to check if Kenwood actuates the low power mode when the antenna Tune button is pressed. Also don't expect to run this rig off of a small solar cell for field day - the unit and all of it's surface mounted components draws a bit of power - enough for the internal fan to come on even in the QRP low power mode.

This modification is read 1868 times.

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19-07-1998
TX Coverage mod TS-50

Hi folks,

I just got a spanking new Kenwood TS-50S.

Searching around the local LLBBS's I found a very simple mod for full transmit from 1.7 - 30 mhz....

Remove the bottom cover of the TS-50

Locate the PLL board -- it is the pc board on top of the main board, it has a shield on it's right side.

Locate the only non-surface mounted component on the PLL board -- look near the rear left-hand side of the pll board (front of radio facing you) and remove the very obvious diode. You can't miss, ther's only one.

D5. Thanks to Hugh Brunson, (ae4n@arrl.net) for the picture.

Replace cover.

Perform microprocessor reset as described in your manual.

This modification is read 2698 times.

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23-01-1999
CAT control for TS-50S

From: 9A2NX@9A0YKZ.HRV.EU

I wish to offer an cheap solution for solid work with CAT control with your transceiver Kenwood TS-50S and PC. After long examinations and testing.
I found out following solutions as most acceptable:
  1. Interface IF-10D (227DM) and serial interface RS-232C (283DM) with program.
  2. Interface IF-10D,line DIN6P connector and DB9 for PC (COM1), 2 germanium diodes, 2 condesators 10nF, which acts as RS-232C !
  3. Small home made interface, in SMD technology, on the PCB 2x3 cm,integrate with TS-50S on the lower side of its PCB. The connecting line with PC can be home made. This can be done by specialists which can achieve an cheap solution.
The most convenient solution is mentioned under 2. Software is selected between 40 different solutions.The best one that made by N3EQF, RIG-EQF ver. 1.02. He is well known author for LOG-EQF software. This software is produced for TS-940S ?, but it works OK with TS-50S. The program runs after command RIG-EQF 1, for COM1 and RIG-EQF 2, for COM2. I tested program on laptop T2200SX25 and on PC 80386DX40.
The program is easy to use, with simple commands. The program can be activated only if all his hardwware is on, interface, PC and TS-50S. When the program is active the working frquecy is displayed,very precisely registering each change, then RIT control, modulation, VFO A and B, SPLIT etc.
Option O has possibility to input 22 different QRGs, modulations, descriptions and call sigs. Then you can choose any of them with coursor.
With key P is possible to obtain scanning of frequency in the wished range,then step raster and speed.
The second program , witch works the same things, but in litlle bit reduced range, is KEN-AE6G, dated 1990. it has VFO A and B control, and M memmory control. It is intended for use with TS-440 and TS-940s!
I include the plan of connection for IF-10D to DB9 pin PC port. The software can be downloaded from BBS and programs are very well sorted on FBBS of IV3LAV-8 via IR3GO (gonode). Using yapp protocol all can be quickly dowwnloaded from subfolder RTX. Names are RIG-EQF.ZIP 71.005 bytes, and TS50.ZIP - 6.847 byta. Detail description, schemas and know-how will be published in "Radio HRS",edition of 9A union.
On my TS-50S I tried the work with 2 computers: laptop worked with CAT-control, while PC 386 worked with SSTV (Hi )! The work was stable.

I wish to all CAT enthusiasts a lot of pleasure.

Vy 73 de IKO-9a2nx@9a0ykz.hrv.eu !
Connection "home made" cable to IF-10D to PC:
  IF-10D                                                    PC-DB9
_________                                                _____________
DIN6P.
  1. o GND------------------------------------------------o 5.(GND)
  2. o TXD------------------------------------------------o 2.(RXD)
  3. o RXD---------------------------I>I------------------o 3.(TXD)
                                  |--I I--|
  4. o CTS-----------------------------------I>I----------o 7.(RTS)
                                          |---I I---|
  5. o RTS------------------------------------------------o 8.(CTS)
  6. N.C.
        -I>I- germanium dioda -in ser!
        --I I---paralel diods kond 10nF
 de Iko-73!
 

This modification is read 3332 times.

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14-02-1999
Important note to 0-30 MHz TRX mods

If you want to make your TS50 tranceiving 0-30 and find more then 1 diode in your radio, PLZ watch out! Dnt remove diode nr1! Remove nr5.

If you remove diode nr1 your radio is history!

This modification is read 4081 times.

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19-01-2000
New version. General TX for TS-50

The new version of the TS 50 has three non surface mount diodes to be cut for general TX.

This modification is read 4810 times.

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22-04-2000
TS-50S Lithium battery replacement notes
Author: Kenwood Communication, inc.


Service Bulletin no. 1015 (10 May 1993)

Procedure:
Immediately after replacing the Lithium battery you must cycle the radio ON then OFF. Failure to follow this procedure will result in premature failure of the battery. If the power is not cycled ON then OFF the microprocessor will immediately begin drawing approximately 1 mA of power from the Lithium battery, resulting in poor battery life.

When the battery is replaced we recommend the insulation sheet also be changed. Part numbers for the battery and insulation sheet follow.

Parts required:

Qty    Description                       Kenwood Part No.   Circuit description
 1     Lithium battery                   W09-0515-05        BA1
 1     Insulating sheet                  F20-0521-04        --
Caution: This modification requires soldering equipment rated for CMOS type circuits. It also requires familiarity with surface mount soldering techniques. If you do not have the proper equipment or knowledge do not attempt this modification yourself. Seek qualified assistance.

Time required for this modification is 15 minutes or less.

This modification is read 5384 times.

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23-04-2000
TS-50S "Hello" displayed during TX
Author: Kenwood Communication, inc.


Service Bulletin no. 1030 (29 June 1993)

Symptom:
Occasionally an "Hello" message will appear in the display of the transceiver when the TS-50S is loaded into a antenna without the use of an antenna tuner. This symptom usually occurs when the negative terminal of the power supply is floating (un-grounded for RF). This can result in RF feedback that causes the supply voltage to exceed to 16 Vdc.

Corrective action:

  1. Cut the Final Unit PC Board foil in two places, as shown below.

  2. Add a .01 F chip capacitor (C125) as shown below.

  3. Add a 10 H chip Ferri-inductor (L102) as shown below.

  4. Add an insulated jumper wire as shown below.

Parts required:

Qty   Description                          Kenwood Part No.  Circuit description
 1    .1 F chip capacitor                 CK73EB1E104K      C125
 1    10 H Ferri-inductor                 L40-1001-48       L102

Caution: This modification requires soldering equipment rated for CMOS type circuits. It also requires familiarity with surface mount soldering techniques. If you do not have the proper equipment or knowledge do not attempt this modification yourself. Seek qualified assistance.

Time required for this modification is 30 minutes or less.

This modification is read 6009 times.

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23-04-2000
TS-50S Antenna lead wire
Author: Kenwood Communication, inc.


Service Bulletin no. 1035 (7 December 1993)

Symptom:
Several users have reported a problem with the antenna lead connection, i.e. the lead that connects the antenna connector to the Filter unit (X53-3120-xx). Originally this connection was made by a zero ohm resistor. If excessive stress is placed on the antenna connector this lead is easily broken, with a resulting loss of receiver sensitivity and transmitter power. The use of a small flexible jumper wire will increase the flexibility of this connection, thus minimizing the effect of mechanical stress.

Parts required:

Qty   Description                              New part No.  Circuit description
 1 Cable                                       E37-0445-05   W2

Procedure:
Remove the zero ohm resistor and replace it with the small piece of cable. See accompanying diagram.

Caution: This modification requires soldering equipment rated for CMOS type circuits. It also requires familiarity with surface mount soldering techniques. If you do not have the proper equipment or knowledge do not attempt this modification yourself. Seek qualified assistance from your closest Kenwood Service Center (Long Beach, CA, or Virginia Beach, VA).

Time required for this modification is 30 minutes or less.

This modification is read 6632 times.

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23-04-2000
TS-50S Mechanical noise from final unit
Author: Kenwood Communication, inc.


Service Bulletin no. 1044 (28 March 1994)

Symptom:
When the transceiver is subjected to vibration a mechanical noise can be heard from the output transformer area. This has led to concern by several consumers that something is loose or improperly installed.

Corrective Action:
In order to ease consumer concern toy should add a cushion under transformer L4 as shown in the accompanying diagram, and replace transformer L13 at the same time. This transformer has been fastened to the circuit board with high temperature adhesive, so use caution when removing it from the circuit board.

Parts required:

Qty   Description              Old part No.   New Part No    Circuit Description
 1    Cushion                  NA             G13-0871-04    (Under L4)
 1    Output transformer       L39-1209-25    L39-1252-05    L13

Time required for this modification is 30 minutes or less.

This modification is read 7185 times.

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27-01-2001
TS-50 Modification Full time "Double-Zero"
Author: Chris Arnold - carnold@mericom.com


This modification makes the "double zero" display full time.)
  1. Turn on radio

  2. Go to MENU 'B', item #70.

  3. Program [85] into item 70. This puts the 'double-zero' on the #4 (PF4) button on the microphone. Press the F-LOCK to get out of the menu function.

  4. Press 'F-LOCK' [ON].

  5. Press and hold PF4 button on mic.

  6. While holding PF4 button down on the mic, press and hold the [SPLIT] button.

  7. Release the PF4 button -then- release the SPLIT button.

  8. Turn F-LOCK [off].

  9. Go back to MENU 'B', item '70', and remove [85] or change the number.

This modification is read 7870 times.

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16-06-2001
TX 0-30 MHz for the new TS-50 (May 2001)
Author: - jack84@xs4all.nl


ON the new version are 4 diode on de board.

Cut remove all, D1 D3 D4 D5

Then RESET the Kenwood TS-50

This modification is read 8707 times.

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08-08-2001
TS-50 High-Power-Modification
Author: Joe, DL6IB - info@dl6ib.de


As the most of you TS-50-Users surely know, it is possible to increase the Medium-Power, the Low-Power but not the High-Power-Setting. Reason: There is no Trim-Pot, it is a small SMD-Resistor. With that small Modification you'll get a Trim-Pot and the TS-50 is able to run up to 180 W output without any problems.

  1. Remove Top-Cover and hook out the internal speaker. Place the rig top up, display to you. The area you need is closed to the left side of the CW-Filter-Board on the main-RF-Board, where the Filter-Board is screwed on.
    On the board is printed on 'PL', 'PM', 'PH' and an arrow. Above are two pots and two little black chips, the right one (SMD-Resistor) is very closed to the second pot.

  2. Remove this SMD-Resistor (R214, 10k), wich is located closed above the two pots for Med and Low. It is a VERY small black chip, marked with '103'. Be CAREFULL while soldering!!

  3. Make yourselfe a small Board, 25 mm long, 8-10 mm wide. At one end drill a centered 3mm-hole closed to the edge of the board.

  4. Solder one konventional 4k7-Resitor (standing, a 5k6 or 6k8 also can do it) and a konventional 10k-Trim-Pot (lying) in serial order on this board.
    Make sure, you make no shorts and build the circuit as narrow as possible and very closed to the reverse end, from where you drilled the hole in - you later need 10mm space at the drilled end!



  5. Connect two two fine wires (length aprox. 20 mm) at the ends of this little circuit and solder it (CAREFULLY!!) to the free solder-joints of the resistor. To make it a bit easier: the right one you can solder to a joint about 4mm away of it - just follow the small trace to the right and you will find this lonesome contact.

  6. Remove the screw of the CW-Filter-Board, place your little board hole-on-hole on top of the Filter-Board and Re-Screw the two boards together to the main-board. So your little "Tuning-Unit" is fixed, hanging above the Med- and Low-pot.

  7. Connect the rig to a power-supply (25-30 Amps!), a power-meter, a dummy-load and switch it on. No smoke? So you might have done everything all right ;-)

  8. Push a FM-Carrier on 14Mhz and set the 'new' pot on the desired output. My TS-50 can do max 185 Watts but I have adjustet it to 150-160, so it modulates fine 130 Watts SSB with the original mike - what a difference to that 70 before... Don't adjust it to high, think about your finals and filters!

Note: You are making this Mod on your own risk, I am NOT responsible!

Good luck, 73's
Joe, DL6IB
www.dl6ib.de
info@dl6ib.de

This modification is read 9730 times.

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12-10-2001
Kenwood TS-50S Wideband TX & double zero readout
Author: Gerry - gi0zgb@lineone.net


I purchased a new TS-50S in May 2001, to enable Wideband TX cut D3 &D4 on the digital unit X46 - 315X - XX.

I purchased another new TS-50S today 10/10/2001 the mod is the same except cut D5 as well to enable.

Enable this mod entirely at your own risk and responsibility.

Note; enabling the double zero mod you will lose the RIT display, it's activation is now indicated by a beep. To reverse enable a partial reset by holding down A/B and switch on, or, retain the 70/85 key 4 mic setting and normal function will resume at a key press.

73 Gerry.

This modification is read 10160 times.

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