 PK232-TS440 via ACC2 plug connection.



SUBJ:  PK232 - Kenwood TS440 connection via ACC2 13-pin plug.
       Mike mute.

Hello,

A lot of PK232 users seem to have problems to connect this TNC
to the 13-pins accessoire plug (ACC2) at the rear of the Kenwood
TS-440 H.F. transceiver.
Here is the wiring diagram of the connection i already use for
quite some time without any problem, so fasten your seatbelts...

    PK-232                                         TS440 (ACC2)
    ------                                         ------------

 --green--* - -audio in - - - - - - - - - -data out *------ 3

 --red----* - -ptt - - - - - - - - - - - - standby -*------ 13

 --white--* - -mic - - - - - - - - - - - - data in  *------ 11

 --brown--* - -ground - - - - - - - - - - -grnd - - *------ 4 or 8 or 12
                                                    I
 --shield-* - - - - - - - - - - - - - - - - - - - - *

 Be aware that "data in" signal at ACC2 pin 11 is bypassing the
first microphone amplifier stage in the TS440. So you need more
audio signal level from the pk-232 to achieve full H.F. power output.
This can be done bij turning the little audio potmeter at the
rear of the PK-232 fully clockwise and/or change the resistor value of
R160 (3.3K) by soldering an additional resistor parallel to decrease
this value in the PK-232.
The advantage is that you get a much smoother H.F. power gain control
as you can adjust the mike potmeter at the front of the TS-440 for
full power with mike potmeter fully clockwise without overdriving
the PA of your expensive TS-440.
Another advantage is a much better audio signal to L.F. detection ratio
which solved my HF interference problems !
If you also use a VHF/UHF transceiver in FM mode you should remember
that the increased audio-level from the PK232 to the FM rig could cause
the deviation being too big. Adding a resistor in series with the audio
signal line from the PK232 TO the mike plug will cure this problem.
Depending on the rig's mike input layout you will have to experiment
a little bit for the correct resistor value. In my case it is 560 K.


MIKE MUTE
---------

The TS-440 manual very simply states that grounding of ACC2 pin
9 (MIC mute) "mutes the signal input from the MIC jack".
But as pin  13  is internally directly connected to the PTT switch
line of the TS-440 mike jack, you get the result that your microphone
is also muted when the mike PTT switch is pressed, which is not what
we want.
To circumvent this, you could add the following enhancement to the
wiring diagram above by adding 2 small simple glass-diodes in the
13-pins ACC2 plug as follows:

red (ptt pk232 cable)            diode           ACC2 pin 13 (standby)
---------------------------*------I<-----------------*
                           I
                           I     diode           ACC2 pin 9  (mic mute)
                           I------I<-----------------*

With this modification the mike is muted when using the PK-232 but
not muted when using the PTT switch of the mike itself !

Good luck, happy surgery, 73 Andre'  (PA3EJU).  BBS: PI8APN.



Instrucciones para instalar la interface RS-232 del KENWOOD TS440-S:
====================================================================

Estas instrucciones son especficas para el TS440S, pero bsicamente, son
aplicables igualmente a los modelos  TS940, TS811 y TS711.

Es posible que te ahorres varios dlares si sigues estas instrucciones en
lugar de comprar los componentes necesarios para controlar el equipo desde tu
ordenador, en la tienda Kenwood ms cercana. De esta forma, slo tendrs que
comprar los componentes, encontrar en el equipo su lugar de instalacin,
usando para ello el manual de instrucciones de Kenwood.

Los componentes son:

        IC 54 que es un uPD-8251-AC Interface de comunicaciones en serie.
                        comunmente llamado 8251A (precio 1.89 dlares)

        IC 55 que es un TC-4040-BP Divisor CMOS, 12 estados.
                        comunmente llamado 4040  (precio 0.69 dlares)

El kit de interface IC-10 de Kenwood, contiene slo estos dos componentes y
muchas menos instrucciones de las que vas a encontrar aqu. Aparte, su precio
en USA es de 22 dlares.

Las seales son:              nivel TTL (no RS-232)
La velocidad en baudios es:   4800 (1200 opcional)
El formato es:                ASCII serie; 1 Start, 8 Data, 2 Stops

La velocidad de baudios puede ser cambiada a 1200 retirando el jumper W50 e
instalandolo en el centro de su emplazamiento, viendo la radio desde
enfrente.
Esto es mucho ms fcil de entender cuando tengas la radio abierta. Se pueden
obtener otras velocidades distintas. Para ello, es mejor mirar el esquema.

Ya que tendrs que abrir la radio, aprovecha para hacer las siguientes
mejoras en tu equipo. Corta el diodo D-60 para permitir una resolucin de 10
Hz. en tu display digital. Esta modificacin te ser extremadamente til
cuando utilices el RIT/XIT ya que si no, slo tienes una resolucin de 0.01
KHz. Esta modificacin est muy bien descrita en el manual de instrucciones
del equipo.

Esta otra modificacin no figura en el manual. Corta el diodo D-80 y haz un
reset en la MPU. Ahora podrs tambin transmitir en cualquier lugar entre 1.5
y 30.0 MHz. Con esta modificacin podrs trabajar en la red MARS, etc. No
transmitas fuera de banda. Es absolutamente ilegal, incluso por error.

Algunos ordenadores utilizan niveles TTL en su port serie. Si es as tu
ordenador, no debes entonces convertirlas a RS-232.

La interface IF-232 de Kenwood est compuesta por un chip 1488 y un 1489
dentro de una pequea caja. Los dos, componen un RS-232 Quad Line Driver y un
Receiver y se pueden obtener en USA en Radio Shack por slo 1.29 dlares cada
uno. Ahora vas a tener con estas instrucciones una manera fcil de ahorrarte
69 dlares (precio de Kenwood) por esta interface IF-232. El chip 1488
necesita unas tensiones + y -. Una alimentacin sin regular de 12vdc + y - es
suficiente.
Aparte, necesitars una alimentacin de +5vdc para el 1489, instalando para
ello un regulador 7805, en la entrada de corriente de +12vdc. 100 ma. es
aproximdamente la intensidad de corriente que consume todo el circuto.

Conector ACC-1               Utiliza una clavija DIN de 6 pines.
                             Precio en Radio Shack: 1.29 dlares

Pin       Seal         Descripcin
-----------------------------------
 1        Gnd           Seal de masa
 2        TXD           Datos serie de la radio al ordenador
 3        RXD           Datos serie del ordenador a la radio
 4        CTS           Ordenador preparado (Radio Input)
 5        RTS           Radio preparada (Radio Output)
 6                      Sin conexin

Pins 4 y 5 pueden dejarse sin conectar.



The following is a summary of the TS-440 command set. I don't have the RS-232
specs handy, but I beleive the interface on the radio is locked at 4800 baud,
2 stop bits, 8 data bits. Note that commands end with a ';' and not a
carriage return. If you type a carriage return, it is taken as a bad
character. I am in the process of writing a program to control the TS-440
with a PC. So far it runs quite well. To test the connection, type 
   AI1;   and then start playing with the controls.
It should spit back a string that contains all info about the radio. If this
is of any help, I can post more info to the net. I would have posted
directly, but I have always seem to have difficulties getting back to some
people.



                      Command Descriptions for Kenwood TS-440

                        Auto Information
    AIn;                The radio will send the status info automatically
                        when the operator changes any control covered in the
                        IF; command.
                                  n = 0 for Auto Info OFF
                                  n = 1 for Auto Info ON

                        See IF; for response


                        Display Memory
    DMnnnn;             This is a factory diagnostic and is of no practical
                        use.

                                  nnnn = MPU address in hex

                        Response is:
                        DMnnnn-aabbccddeeffgghhiijjkk;
                                  nnnn = MPU address in hex
                                  aa^kk = 16 bytes of data in hex


                        Down
    DN;                 The frequency or memory channel will go down by one
                        step.


                        Read Frequency
    FA;                 Read VFO A.
    FB;                 Read VFO B.

                        Response is:
                        Fxggmmmkkkhhh;
                                  x = A or B
                                  gg  = GHz.
                                  mmm = MHz.
                                  kkk = KHz.
                                  hhh =  Hz.




                        Load VFO register
    Fxggmmmkkkhhh;      Loads a frequency into a VFO:
                                  x = A or B (selects VFO)
                                  gg  = GHz. (May be 00 or spaces)
                                  mmm = Mhz.
                                  kkk = KHz.
                                  hhh =  Hz.


                        Function Select
    FNn;                Select VFO or memory
                                  n = 0 for VFO A
                                  n = 1 for VFO B
                                  n = 2 for memory


                        Identify Model Request
    ID;                 The radio will respond with:
                                  ID001; for a TS-940
                                  ID004; for a TS-440

                        The radio may respond with:
                                  ID002; for a TS-811
                                  ID003; for a TS-711


                        Read Information Request
    IF;                 The radio will respond with:
                                  IFggmmmkkkhhhsnnnzrxyytdfcp;
                                  ggmmmkkkhhh is the frequency (See Fx;)
                                  s   = "+" or "-" value of RIT/XIT
                                  nnn = value of RIT/XIT
                                  z   = "0" (I am not sure what this is)
                                  r (see RT;)
                                  x (see XT;)
                                  yy  = memory channel number
                                  t   = 0 for Receive
                                      = 1 for Transmit
                                  d (see MD;)
                                  f (see FN;)
                                  c (see SC;)
                                  p (see SP;)




                        Lock Knob
    LKn;                Enable or disable manual frequency control:
                                  n = 0 for LOCK OFF (manual control enabled)
                                  n = 1 for LOCK ON (manual control disabled)


                        Memory Channel Select
    MCmmm;              Select a memory channel:
                                  mmm = channel number (000 to max for radio)


                        Mode Select
    MDn;                Select mode:
                                  n = 1 for LSB
                                  n = 2 for USB
                                  n = 3 for CW
                                  n = 4 for FM
                                  n = 5 for AM
                                  n = 6 for FSK


                        Memory Read
    MRnrrr;             Read contents of memory channel:
                                  n = 0 for RX VFO
                                  n = 1 for TX VFO (split channels only)
                                  rrr = channel number (000 to max for radio)

                        The radio will respond with:
                                  MRnrrrggmmmkkkhhhdxxxxx;
                                  n = 0 for RX VFO
                                  n = 1 for TX VFO
                                  rrr = channel number
                                  ggmmmkkkhhh is freq. (See FA;)
                                  d = mode (See MD;)
                                  xxxxx = not used (seem to always be "0   ")


                        Memory Write
    MWnrrrggmmmkkkhhhdxxxxx;
                        Write a memory. See MR; for format


                        RIT/XIT Clear
    RC;                 The RIT/XIT register will be set to 0.00 KHz.



                        RIT/XIT Down
    RD;                 Decrement the RIT/XIT register by 0.01


                        RIT/XIT Up
    RU;                 Increment the RIT/XIT register by 0.01


                        RIT Enable
    RTn;                Enable or diable the RIT function
                                  n = 0 for RIT OFF
                                  n = 1 for RIT ON


                        Receive
    RX;                 Enter receive mode.


                        Scan Enable
    SCn;                Turns scan on and off
                                  n = 0 for Scan off
                                  n = 1 for scan on


                        Transmit
    TX;                 Enter transmit mode.


                        UP
    UP;                 The frequency or memory channel will increment one
                        step


                        XIT Enable/Disable
    XTn;                Turns XIT on and off
                                  n = 0 for XIT off
                                  n = 1 for XIT on



KENWOOD TS-440

     West, Gordon:  "Kenwood 440 Modifications" Popular Communications
              October 1987 p. 62.

Illustration captions:

1. Remove 17 screws holding on the bottom and top covers. The bottom cover
comes off, and the top cover is carefully removed and put next to the radio.
It is till connected via the speaker wire.

2. Gain access to the front of the unit by removing two top side screws and
loosening two bottom side screws. This allows the front assembly to swing
open.

3. Remove the shiny silver control board protection plate. This requires
removing two screws on the top and three screws on the bottom. Lift the plate
out completely.

4. Locate diode D-80 in the bottom left-hand corner. Snip it for all-band
transmit.

5. Now locate D-66 and snip. It adds 10 Hertz readout to your digital
frequency display.

6. Carefully reassemble the control plate using a magnetized tiny screwdriver
to hold the five tiny screws in place. Don't pinch any wires. Also, close up
the front and replace the top and bottom covers with 17 screws.

7. Connect power. Depress A=B switch and turn on the power simultaneously.
This resets the microprocessor for all-band transmit and 10 Hz frequency
display.

This article also tells how to increase the power of the TS-440 by adjusting
the internal ALC control. The procedure is applicable to other rigs.

Frank  W9MKV



 Modification 440-S KENWOOD

TS-440 S MODIFICATION TO USE  ANTENNA TUNER FOR XT AND RX.-
Remove case from rig. Remove (4) screws that holds antenna tuner in place.
Next slide antenna tuner out to get to the coax connections. Remove the in
coax attached to antenna tunerfrom FO connector on filter unit (X51-1340-00).
Remove coax from out connector on antenna tuner and install in FO CONNECTOR
ON FILTER UNIT. Unplug and remove switch unit (X41-1610-00 N-14) from rig.
Remove short wire from antenna connector to PC BOARD. Cut coax on the in
connector of antenna tuner in half and connect cut end to switch unit PC
BOARD where short antenna wire was removed and shield to ground. Solder other
half of coax to antenna connector and shield to ground, and plug other end
into out conector of antenna tuner.  Your still have control of antenna tuner
with auto and thru switch. It works very well. Maybe someone can use this
idea. 
N2EDE, R.I.. Box 680-S, Roanoke, VA. 24012.



 ALC on TS440 => hint..

de DL5MFK @ DB0AAA

de: Axel DL5MFK @DB0BOX from Donauwoerth JN58JR DOK T09

Hello OM's and TS-440 owners!
Imagine you own a transverter, e.g. 10-to-2-meter-band, only rating abt. 500
mWatt Input...
Now, try connect it to the 440 - it will work !!(what else did u expect?!)
But - to get the power on 28mc to 500 mWatts is a very complicated thing,
because the knob for MIC-gain and Carrier is very hard to adjust on these low
levels...
Now, remeber the handbook - wasn't there somewhere something mentioned about
the ALC? YES it IS!!! the REMOTE-Connector gives a direct access to the
ALC-ciruitry, just put in -3 to -11 Volts in, and enjoy the easy low-power-
-regulation... BUT!!!!
HOW DO I GET A (compared to GND="-") NEGATIVE tension?! (even in mobile
operation...)
Well, there a little IC's that convert RS232-lecel to TTL...
Get it? they produce out of 5Volts source +/- 12 Volts...
So, take e.g. an MAX"#", an BC 547, a 5Volt Zener-diode and an 2k2ohms
resistor make a 5V-mini-supply and build it together with the 4 capacitors
needed round the MAX 232... Connect e.g. pin 10 to +5V, and load pin 7 with
an trimmer 4k7 ohms to ground; the middle pin of the trimmer now gives you an
ALC-supply of -0 to -11 (or more, depends on supply of MAX232!) Volts, which
now can drive the ALC, and regulate it MUCH better in low-power!
BUT!!! the MIC and CAR-regulators are still in function!!!!!!! mind that
try it, the higher the neg.tension on ALC-in, the lower the power!
Mine works ufb with an Microwave-Modules 28/144 SSB transverter!
73's de Axel, Donauw|rth es hpe cuagn!

de: Axel DL5MFK @DB0BOX from Donauwoerth JN58JR DOK T09



 TS-440S FM RECEIVE IMPROVEMENTS 02.0CT.91
de DL4NDK @ DB0BOX

The TS-440 FM receiver seems to be constructed for 25kHz
steps. Using 10kHz steps, the bandwith is much to wide.

I changed the 455kHz Murata F-Type Filter into an narrow
H-Type, thougth I had success, but strong signals on
adjacent frequencies now muted my speaker.

Using the 8,83 MHz filter on the RF Board, which is normaly
bypassed by FM solved this problem and I got a very useful
FM rig, even with the original F-Type FM-Filter. 


REQUIRED PARTS:

2 DIODES 1N4148


1.	Disconnect the power supply and antenna.

2.	Using a #2 Phillips screw driver, remove the screws
	from the bottom cover. Remove the bottom cover from the
	transceiver.

3.	Locate resistor R59 and condenser C131 on the component
        side of	the RF board.

4.	Using a #1 Phillips screw driver, remove the screws
	that secure the RF unit to the chassis of the
	transceiver.

5.      Remove all plugs still keeping the board in position.

6.	Pull the board up and rotate it towards the front of the
	transceiver to expose the foil side of the board.

7.	Find joint of R59 and C131 opposite their ground connection.

8.      Disconnect R59 from C131 by scratching the track with a
        sharp knife.

9.	Install and solder diode A with anode connected to R59
        and kathode connected to C131.

8.	Install and solder diode B with anode connected to R58/C130
        and kathode connected to C131.

9.      Remove resistor R57.

10.	Assemble the transceiver by reversing steps 1 - 6.


73 and good luck. If you know any mods to increase the performance
of this nice radio, please let me know.

Helmut in Erlangen, DL4NDK @ DB0BOX.EU.GER



TS-440S CW SIDE TONE IMPROVEMENTS

Under certain circumstances the CW side tone frequency is not stable
while transmitting but raises. This is due to RF creeping up the keyer
cable into the side tone oscillator. Better blocking will sharply reduce
the effect.


REQUIRED PARTS:

10 nF ceramic condenser


1.Disconnect the power supply and antenna.

2.      Using a #2 Phillips screw driver, remove the 9 screws from the
        top cover. Remove the top cover from the transceiver and unplug
        the speaker wire.

3.      Locate the small SMD board (X59-1060-00) which comprises the CW
        side tone oscillator on the component side of the IF board.

4.      Using a #1 Phillips screw driver, remove the 7 screws that
        secure the IF unit to the chassis of the transceiver.

5.      Pull the board up and rotate it towards the front of the
        transceiver to expose the foil side of the board.

7.      Install and solder a 10 nF ceramic condenser between pin 9 of
        the SMD side tone oscillator board (X59-1060-00) and ground.

9.Assemble the transceiver by reversing steps 1 - 5.

This is an optional change that may not be performed under warranty.
Time required for this modification is 0.5 hrs or less.


73 and good luck. If you know any mods to increase the performance of
this nice radio, please let me know.

Richard in Erlangen, DL8MFQ @ DB0BOX.DEU.EU
