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kenwood 440 mods
warning never do these!!
| Type: | Amateur HF transceiver |
| Frequency range: | TX: 10-160 m + WARC RX: 0.15-30 MHz |
| Mode: | AM/FM/SSB/CW |
| RF Power output: | Max 100 W (AM: 50 W) |
| Sensitivity: | N/A |
| Selectivity: | N/A |
| Image rejection: | N/A |
| Voltage: | 12-16 VDC |
| Current drain: | RX: 1.9 A TX: Max 20 A |
| Impedance: | 50 ohms, SO-239 |
| Dimensions (W*H*D): | 270*96*313 mm |
| Weight: | 6.3 Kg |
| Manufactured: | 1986-19xx |
| Other: | Auto-AT option. |
| Kenwood TS-440S (TS 440 S TS440S) Circuit
Improvements |
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Problem: Limited transmit frequency coverage. Fix: Cut D80 on the Control Unit for 1.6MHz to 30MHz transmit capability. D80 is about 2" from D66, which is cut for 10Hz frequency readout. |
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| Kenwood TS-440S (TS 440 S TS440S) mod for
improved receive sensitivity of 0.5 to 1.6MHz |
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TS440S mod for increasing sensitivity on the MW AM broadcast band: (Removes MW attenuator pad). The TS440S has an attenuation pad hard wired on the spectrum between 500KHz and 1600KHz. You can open up sensitivity by removing it. On the RF unit board, clip a lead on R13 68 ohms), clip a lead on R14 (68 ohms), and solder a jumper across R12 (220 ohms). These are under a shield held down by screws on the RF board. I've noticed no intermod problems and only the strongest stations (above S + 40) overload (which can be solved by using the front panel attenuator button). Proceed at your own risk. |
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| Kenwood TS-440S (TS 440 S TS440S) PLL unlock due
to VCO #1 |
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The TS-440S Control unit supplies band information to four circuits in the transceiver. The circuits are the receiver front end Band Pass Filter (BPF), the antenna tuner (AT), the transmitter Low Pass Filter (LPF), and the VCO circuits on the RF board that are part of PLL #1. There are ten receiver front end BPFs that are diode switched into operation. If one of the diodes (D4-D23) becomes shorted or leaky, the band information is felt at two BPFs at one time. The voltage going through the bad diode will loop back to the VCO circuit, antenna tuner circuit, and LPF circuit. The unwanted voltage will then create one or more of the following symptoms:
The most common symptom is the PLL unlock. To test the diodes, remove the large shield on the RF board to expose the BPF circuits. Reset the transceiver by holding in the A=B button as power is turned on. Even if the display only shows decimals, only the BPF for 14 MHz should be turned on. Using a DC voltmeter, measure the voltage at coils L11, L15, L21, L28, L34, L40, L46, L52, L58, and L62. Only coil L52 should measure 8 Vdc. The other coils should read 0 Vdc. If one reads 0.5 - 8 Vdc, replace the two diodes in that BPF circuit. Coil/Diode/frequency range relationship: L11 D4 D5 0 - 0.5 MHz L15 D6 D7 0.5 - 1.6 MHz L21 D8 D9 1.6 - 2.5 MHz L28 D10 D11 2.5 - 4 MHz L34 D12 D13 4 - 6 MHz L40 D14 D15 6 - 7.5 MHz L46 D16 D17 7.5 - 10.5 MHz L52 D18 D19 10.5 - 14.5 MHz L58 D20 D21 14.5 - 22 MHz L62 D22 D23 22 - 30 MHzReplacement diode part number 1S2588 or 1SS91S: D4, 6, 8, 10, 12, 14, 16, 18, 20, 22 BA282 D5, 7, 9, 11, 13, 15, 17, 19, 21, 23
 Time required to perform this modification is 1 hour or less. |
| Kenwood TS-440S (TS 440 S TS440S) Intermittent
operation |
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When intermittent problems such as erratic display, loss of front panel control, or frequency lock-up are encountered, the PLL and Control circuits must be checked to determine which circuit is malfunctioning. While any number of components may cause such problems, if the Control circuit is suspect, there is a possibility that the ROM socket is at fault. The socket should be tested to determine if it is making good electrical contact with each pin on the ROM. If it is found to be defective, remove the socket and solder the ROM directly to the board. The ROM is IC52 on Control unit (B/2). It should be noted that units with serial number of 909xxxx and above do not incorporate a socket. Caution Removing the socket requires good soldering skills. The ROM is mounted on the Digital A unit and is designated as IC2. The board, being double sided, has solder connections on both component and foil sides. When the socket is removed, it is very important to insure that each pin is completely solder free. Having to pry up on the socket means that it is not completely desoldered and will cause the circuit foils to tear. When performing any work on the Control boards, CMOS handling techniques must be observed. Such techniques include using a grounded or isolated soldering tip, avoid touching the pins of IC chips with your fingers, and ground yourself with a wrist ground strap. To remove the socket:
If the foil side of the board id not sufficiently exposed for desoldering purposes, remove the 3 hex bosses from the bottom Control board. Pull both boards forward and open them like a book to allow the best access to the foil side of Control board (B/2).
This modification may be covered under warranty during the warranty
period. |
| Kenwood TS-440S (TS 440 S TS440S) SSB
Power-adjustment |
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Hello TS 440 user. The last few weeks I've seen questions of how to make the power in SSB mode for the TS440S adjustable without changing the Mic-Gain. It's a very easy job to do. Take off the top cover of the rig. At that moment you have a sight on the first unit (IF-Unit) Than you have to look for Diode 49. You will find Diode 49 at about 5 CM from the backend of the unit and about 6,5 CM from the leftside of the unit. Just next of C138 and between plug 38? (red/orange wires) and plug 26 (black-cover/blank wires) Just cut that Diode 49,bend one part a little away and leave the part's where they are. It's the best way to do I think. Replace the topcover. From now on it is possible to adjust only the power in SSB mode by just turning the CARRIER Control at the front of your rig and leave the Mic-gain for where it is. Turning counterclock will minimize the power until a 20mW or something like that. Because most TS440 users have'nt used their carrier control that much I think it's better to pull off the MIC/CAR knobs and spray some contact cleaner in the shafts. (I know,it's not the best way). When you switch your rig into the CW mode you can adjust the power in what you like,switch the mode in to USB or LSB and if it is correct the power will not come above the level that what you have adjusted in the CW mode. Just simple , is'nt it? Of course you will do this all in your own responsibility because I won't take any!!! Agree? |
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| Kenwood TS-440S (TS 440 S TS440S) Fan Temperature
Modification |
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I don't know about you, but I don't think solid state equipment needs to run hot enough to fry an egg on. The fan on the 440 is set to come on at 50 deg C. That makes the heatsink hot enough that you can only put your hand on it for about 3 seconds without being in pain. Looking at the schematic and pondering the situation, I decided that it would be quite easy to change the "trigger" point for fan operation. This mod will do just that and not effect the "high-temp-shutdown" mode that is provided in case the fan dies. Actually, it wouldn't be a bad idea to make the same sort of mod to that circuit too, but let's just do this one for now. I'll put out another bulletin on this if I go into the failsafe circuit. The fan is controlled by two sensing circuits on the FINAL UNIT. On the schematic, Q9(1/2) is the failsafe trigger that activates the powerdown circuit in case the final reaches 80 deg C. It won't normally do this, even under continuous keydown conditions, unless the fan has failed. Q9(2/2) is the stage that controls operation of the fan. It is a simple voltage comparator and therefore can be made to trigger wherever you want. TH1 is a thermistor with a negative coefficient. That is, when the temp rises, the resistance goes down. This pulls the - input to Q9(2/2) lower and lower until it is at or below the 2.26v reference that is present on the + input of the same stage. At that point, the output flips high and turns on Q8, thus turning on the fan. By raising the reference voltage at the + input, the TH1 voltage will fall to the reference voltage sooner and turn on the fan at a cooler temperature. By clipping the top loop of R27 on the final unit (2.2k res. that provides reference voltage) and temporarily inserting a 5k precision multi-turn pot in series with it, I determined that I liked the way it operated with about 800 ohms extra resistance in the circuit. I then installed an 820 ohm fixed resistor in series with the cut loop. I also put a very small dab of silicon seal between the new "hung" resistor and the ferrite transformer right next to it so that there would be no added strain on the remains of R27. The alternative would be to remove the final unit completely and do the mod the right way, replacing the complete R27 with a 3k resistor. This was a step that I didn't really want to perform on a two week old rig. When you choose your series resistance, remember that the more resistance you add to it, the sooner the fan will turn on. If you go too high, it will be on all the time. This modification brings the fan on at least 10 deg. earlier. By the way, my only reservation about this mod is the added wear and tear on the fan unit itself. I have been buying parts from Kenwood for about 10 years now and they have always seemed remarkably inexpensive. Ordering a spare fan to have on hand seems like a very reasonable thing to do if you are worried about it. |
| Kenwood TS-440S (TS 440 S TS440S) Possible cure
for TS440 showing dots only on display |
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The most common reason for the the display to show only dots, is that one of the phase locked loops is not locked. So take of the top cover. You will be looking at the IF unit. This board is mounted in a hinged frame. It hinges on two screws near the front pannel sides. So remove the other two screws near the final unit instead and hinge the IF board towards you. You now uncovered the PLL unit. There are five PLL's on this board. Each one has a pin indicating if its loop is locked or not. So get out a volt meter and set it for 5 volts full scale. Now check pin 2 for each of the following IC's. IC18, IC1, IC4, IC9. Also check pin 7 of IC17. If all the loops are locked, you would see a steady voltage there in the neighbourhood of 4.7 volts. If any of the loops is not locked, one of these pins has a voltage well below 1 volt. Note the IC number so you can look up which VCO you may have to tune a bit so it will lock again. IC18 VCO#5 T20 IC1 VCO#4 T1 IC4 VCO#3 T2 IC9 VCO#2 T9 The above are all located on the PLL board.The VCO for IC17 is actualy one out of four different VCO's selected on the RF board. Which one of these depends on what band is selected. If you have display dots on all the bands, then you have no problem with the PLL made up with IC17. So you only have to adjust either T1, T2, T9 or T20. Now here it goes. Make sure you have an alignment tool that isn't to small or to large for the slots in the slugs in the coils (T1, T2, etc.) Also, absolutely don't turn any other coil than the one that belongs to the unlocked PLL. If you do so anyway without a service manual and proper equip- ment, then you are likely stupid. Only turn the indicated slug. First turn it 1/4 clock wise and see if it is ok now. If not, turn it 1/4 counter clockwise and see if it works. I suggest that you don't try more than one half turn either way. If you think that it needs to go that far, it likely has an other problem. If the display dot problem only shows up on some but not all band, send me a note and I will see if I can help you. The correct way would be to use a good voltmeter and follow the service manual for this adjustment. But in most cases, the above will do fine. I don't work for Kwood, I don't have a 440. Just a service manual for one. But I did cure some of the above problems. |
| Kenwood TS-440S (TS 440 S TS440S) Undocumented
feature |
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The TS440 is nice. Here's what I've found out about it that isn't in the operation manual (in some random order): Diode options: There are a bunch of configuration options controlled by clipping or inserting diodes on the back of the control board. You get to it by taking the top and bottom covers off (a bunch of silver screws), loosening the front panel (4 flat-head silver screws, NOT the black ones). Then you have: diode controls in out (cut) ----- -------- ---------- ---------- D65 mode confirmation Morse single beep D66 display resolution 100 Hz 10 Hz D67 memory protect none on D73 CW shift 800 Hz 400 Hz D78 WARC 24MHx band tx disabled enabled D79 WARC 18MHz band tx disabled enabled D80 General Coverage tx disabled enabled
Test What it does
---- ---------------------------------------------------
0 all positions in display light
1 all segments in display dark
2 all positions in display light
3 all segments in display dark
4 one digit lighted (rightmost)
5 next digit lighted
6 next digit lighted
7 next digit lighted
8 next digit lighted
9 next digit lighted
10 next digit lighted
11 next digit lighted
12 next digit lighted
13 next digit lighted
14 next digit lighted
15 next digit lighted
16 next digit lighted (leftmost)
17 beeper sounds
18 beeper silent
19 all mode LEDs ON
20 all mode LEDs OFF
21 receive
22 transmit
--------------------------------------------------------------------------
The following tests change internal signals. They are most useful if you
are trying to trace the circuits controlled by these signals.You'll need a s service manual (or at least a schematic) to made reals sense of these. 23 Band select - all lines high
24 BAND select - all lines low
25 PD select - all lines high
26 PD select - all lines low
27 ENF select - all lines high
28 ENF select - all lines low
29 ENP select - a:ll lines high
30 ENP select - all lines low
31 RES select - all lines high
32 RES select - all lines low
33 CO select - all lines high
34 CO select - all lines low
35 AX select - all lines high
36 AX select - all lines low
these next tests check the outputs of the 8255 parallel port interfaces,
which select several internal functions. 37 (IC2) port A all lines high
38 (IC2) port A all lines low
39 (IC2) port B all lines high
40 (IC2) port B all lines low
41 (IC2) port C0-C3 high, C4-C7 low
42 (IC2) port C0-C3 low, C4-C7 high
43 (IC53) port C all lines high
44 (IC53) port C all lines low
Following display busy lines and scan lines in the rightmost 9 digits of
the display. You will push buttons to cause the digit to change from a 1
to a 0 indicating that the associated button has been pushed.test bit8 bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0 ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- 45 LOCK AT Mic UP Mic DN PTT/AT VS1 46 (none) 47 (key scanner) 48 1 6 V/M VOICE 49 2 7 M>V RIT A/B 50 3 8 SCAN XIT SPLIT 51 4 9 M.IN T-Fset A=B dip3 dip4 dip5 52 5 0 CLEAR 1Mhz dip1 dip2 dip6 dip7 53 ENT DOWN UP dip8 dip9 dip10(the digits 0-9 are on the front panel keyboard; dip2-dip10 are the segments of S50, the SSB frequency response dipswitch on the rear of the control unit printed circuit board.) 54 not used 55 not used 56 END |
| Kenwood TS-440S (TS 440 S TS440S) Serial
interface |
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The TS440 has a serial ASCII interface option. You have to insert two chips into sockets on the back of the control unit circuit board to take advantage of this. IC54 is an 8251A Uart, and IC55 is a CD4040 divider. These chips are available from Kenwood together with a interface manual, or you can buy them at your local chip shop for about $6.00 or so. When inserted, the transceiver speaks 4800 baud ascii in/out the 6-pin DIN connector ACC-1 on the rear. The signals are from the 8251, but are inverted in a 74LS04 and RFI filtered before being brought out to the world. An interface box with inverter, RFI filter, power supply, opto-isolator, RS232 level shifters, and power supply is available from Kenwood for about $49.00, or you can build your own. (Depending on how much your computer radiates and how sensitive to RF it is, you may only need 5v, +/-12v, a 74LS14, MC1488, and MC1489. If your computer has a TTL level serial port, perhaps all you'll need is the 74LS14. If you're not confident of being able to solve the possible digital/RF interface problems yourself, the $49 interface is proably a good buy.)
ACC-1 Serial Interface
pin signal
--- ----------------------------------------------------
1 signal ground
2 data from transceiver
3 data to tranceiver
4 cts to transceiver - computer can throttle output
5 cts to computer - transceiver can throttle input
6 no connection
SSB frequency response dipswitch: located on the back of the control
unit, this adjusts the frequency response of the upper and lower
sideband modulators to compensate for component variations. Changing it
isn't a good idea, since you have to have a two-tone oscillator and have
to reset the carrier suppression adjustment if you do. The service
manual explains this process; I'm including this here so that people who
have been wondering what the dipswitch does won't screw themselves by
flipping switches to see what happens. |
| Kenwood TS-440S (TS 440 S TS440S) A few
adjustments you should know |
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A few adjustments you should know about (read the service manual before you tweak wildly on these!): tweaker what it does
------- -----------------------------------------------
RF-VR3 FM Microphone Gain
RF-VR6 FM Deviation - set to 4.6KHz on dev meter
IF-VR2 S-meter zero - set to zero with 50 ohm dummy load
IF-VR3 S-meter S9 - set to S9 with 40dbu input 14.175MHz USB
IF-VR4 Squelch threshold - close at 12 o'clock with
mode = CW and filter WIDE
IF-VR9 CW side tone level - as you like it
IF-VR10 Beep tone level - as you like it
Someone wanted to know what the difference between the DATA connections
on ACC-2 and the AFSK connectors was. On output, none; the AFSK and the
DATA out pin on ACC-2 are connected together, and are fed from the high
side of the volume control - they are receiver audio BEFORE the cw
sidetone, beeper, and voice response unit are mixed in, and should be a
constant level independent of the AF gain setting. The AFSK input is
different from the DATA IN connection; AFSK and microphone signals both
go through the mike preamp and speech processor; the DATA input bypasses
both. The MIC GAIN pot does control all three input levels.(as a note, you can tap preamped/processed audio OUT of the DATA IN connection, since it is just a tap on the output of the preamp/processor. This is also the feed into the FM modulator. But NOTE that the MIC GAIN pot doesn't adjust the mic gain on FM - there is a separate tweaker for that.) |
| Kenwood TS-440S (TS 440 S TS440S) modification
to use antenna tuner |
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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. |
| Kenwood TS-440S (TS 440 S TS440S) display
calibration |
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I found there was some shift in the reference oscillator frequency of my TS-440S. This can be noticed and corrected as follows:
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| Kenwood TS-440S (TS 440 S TS440S) Connection to a
DATA |
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Connection of the KENWOOD TS440S to a DATA terminal such as a Kantronics KAM using the rear ACC2 13 pin jack. ____ 4 3 2 1
GROUND ___ |
|____ 8 7 6 5
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|___ 12 11 10 9____________
/ |
MIC ____________/ 13 |
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\_/ \_/
===== =====
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|___________________|
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PTT
Pins | Application
-----------------------------------------------------------------
3 Data output - not used as the level is very low
the prefered connection is via the speaker output
this also allows fine adjustment of level to
enable best decoding. (A switch on the speaker to
'mute' it when required is a good idea.)
4 Ground - you may have to experiment with these
8 connections to eliminate RF feedback and noise.
12 Here they are all strapped.
9 Mic mute - prevents audio pickup from the mic when
earthed. By connecting to the PTT line as shown
through a diode automatically MUTES the mic when
using data. When the front panel PTT or MIC PTT
are used the microphone is 'live'.
13 Standby - PTT which when taken to ground puts the set
'on air'. By connecting through a diode as shown
doesn't affect the PTT operation but allows auto
mic muting.
The diodes used can be virtually anything, here they are IN4148.The INPUT audio to pin 11 must be quite a high level. If using a KAM you are certainly going to have to change the HF LEVEL JUMPER in the KAM. The level of the KAM as shipped suites connection to the FRONT PANEL MIC but not the rear connector, you can however correct this with the jumper. People using the PK232 have complained of NO TX AUDIO, I suspect the level is so low that only local minitoring will show a level present. |
| Kenwood TS-440S (TS 440 S TS440S) Computer
Interface Instruction |
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These Instructions are TS-440 specific, but the basics also apply to the TS-940, TS-811 and TS-711. It is possible to save yourself a few dollars and lose nothing in quality by buying the parts to upgrade your Kenwood radio for computer control. Just purchase the parts were you find them and install them using the instructions in the Radio's Manual. IC 54 is a uPD-8251-AC Serial Communications Interface.
Commonly called an 8251A ($1.89 Mail Order)
IC 55 is a TC-4040-BP 12 Stage CMOS Divider.
Commonly called a 4040 ($0.69 Mail Order)
The IC-10 Interface Kit from Kenwood Contains ONLY these two parts and
less instructions than are in this file. The only thing you are going to
miss, is the $22+ price tag on the IC-10 Kit.Signals are TTL levels (NOT RS-232) Baud rate is 4800 (1200 Opt.) Format is ASCII Serial; 1 Start, 8 Data, 2 StopsThe Baud rate may be changed to 1200 Baud by removing jumper W50 and installing a jumper from the left pad to the center pad as viewed from the front of the radio. This will become obvious once you have the radio opened up. Many other Baud rates are possible, just look at the schematic. As long as you are in the radio, lift D-66 to enable the 10 Hz. display. The main tuning knob is varing this digit, so you might as well see it. It also helps when using RIT/XIT as the RIT/XIT display does not resolve the 0.01 KHz. digit. This Modification is in the Radio's Book. Not in the book is the fact that if you lift D-80 and do an MPU reset, you will be able to transmit on any frequency between 1.5 and 30.0 MHz. This means you will be able to work the Mars nets, Etc. Do not transmit out of band. It is illegal even if it is accidental. Some computers use TTL levels on their serial ports. If so, here is a time when you will not have to convert it to RS-232. The IF-232 Interface from Kenwood is a 1488 and a 1489 chip in a box. These are an RS-232 Quad Line Driver and Receiver and are available at Radio Shack for $1.29 Each. Here is an easy project that will save you a lot over the $69+ Kenwood price of the IF-232 Interface. The 1488 needs a + and - supply. Unregulated + and - 12vdc is just fine. Get the +5 vdc for the 1489 by putting a 7805 regulator on the +12 vdc supply. 100 mA. is about the max you'll draw, so the smallest transformer you can find will still be plenty large. Don't forget to series up two of each gate to cancel the inversion that the 1480's produce. ACC-1 Connector Use a 6 Pin DIN Connector.
(Radio Shack $1.29)
Pin Signal Comments
________________________
1 Gnd Signal Ground
2 TXD Serial Data from Radio to Computer
3 RXD Serial Data from Computer to Radio
4 CTS Computer Ready; (Radio Input)
5 RTS Radio Ready; (Radio Output)
6 No Connection
Pins 4 and 5 may be left Unconnected.
***** Command Description for Kenwood Computer Interface *****
______________________________________________________________
Auto Information
________________
AIn;
The Radio Will Send the Status Info Automatically
Whenever the Operator Manually Varies any Function
on the Radio which is Covered in the IF; Command
Where n = 0 for Auto Info OFF
1 for Auto Info On
The Status Information Will be Sent in the Form :
As defined in the IF; Command
Display Memory
______________
DMnnnn;
This is a Factory Diagnostic Function
and is of no practical use to the operator
The Contents of the MPU Memory will be Read
Where nnnn = MPU Address (0000 Thru FFFF (HEX))
The Contents of the MPU Memory Will be Sent in the Form :
DMnnnn-aabbccddeeffgghhiijjkk;
Where nnnn = MPU Address (0000 Thru FFFF (HEX))
aa~~kk = Hex Number Pairs Of Next 16 Locations
Down
____
DN;
The Frequency or Memory Channel
Will Decrement One Step
Frequency VFO A / VFO B Request
_______________________________
FA;
FB;
The Frequency in the Selected VFO Will be Read
The Frequency Will be Sent in the Form:
FAggmmmkkkhhh; or
FBggmmmkkkhhh;
Where gg = GHz. Value
mmm = MHz. Value
kkk = kHz. Value
hhh = Hz. Value
Frequency VFO A / VFO B Select
______________________________
FAggmmmkkkhhh;
FBggmmmkkkhhh;
The VFO Selected Will be Set to the Frequency Defined
Where gg = GHz. Value (May be sent As 00 or Spaces)
mmm = MHz. Value
kkk = kHz. Value
hhh = Hz. Value
Function Select
_______________
FNn;
The Function Defined Will be Selected
Where n = 0 for VFO A
1 for VFO B
2 for MEMORY
Identify Model Request
______________________
ID;
The Model of the Radio Will be sent in the Form :
ID00n;
Where : n = 1 for a TS-940 (*)
n = 2 for a TS-811 (*)
n = 3 for a TS-711 (*)
n = 4 for a TS-440
Read Information Request
________________________
IF;
The Status Information Will be Sent in the Form :
IFggmmmkkkhhh snnnzrx yytdfcp
Where gg~~hhh = Value as defined in FA Command
s = "+" or "-" Value of RIT/XIT
nnn = Value of RIT/XIT (n.nn kHz.)
z = "0" (Not Used in TS-440)
r = Value as defined in RT Command
x = Value as defined in XT Command
yy = Memory Channel No.
t = 0 for Receive
1 for Transmit
d = Value as defined in MD Command
f = Value as defined in FN Command
c = Value as defined in SC Command
p = Value as defined in SP Command
Lock Knob
_________
LKn;
The Manual Frequency Control Functions Will be Disabled
Where n = 0 for Lock OFF
1 for Lock ON
Memory Channel Select
_____________________
MCxmm;
The Memory Channel Defined Will be Selected
Where: x = Don't Care (Use "0" or Space)
mm = Memory Channel No. (00 thru 99)
Mode Select
___________
MDn;
The Mode Defined Will Be Selected
Where: n = 1 for LSB
2 for USB
3 for CW
4 for FM
5 for AM
6 for FSK
Memory Read
____________
MRnxrr;
The Memory Channel Defined Will be Read
Where: n = 0 for RX VFO
1 FOR TX VFO (Split Channels Only)
x = Don't Care (Use "0" or Space)
rr = Memory Channel No. (00 thru 99)
The Memory Information will be sent in the Form :
MRn rrggmmmkkkhhhdz ;
Where: n = 0 for RX VFO
1 FOR TX VFO (Split Channels Only)
rr = Memory Channel No. (00 thru 99)
gg~~hhh = Value as defined in FA Command
d = Value as defined in MD Command
z = "0" (Not Used in TS-440)
(Note: Four trailing Spaces)
Memory Write
____________
MWnxrrggmmmkkkhhhdzxxxx;
The Memory Selected Will be Set to the Frequency Defined
Where: n = 0 for RX VFO
1 for TX VFO (Split Channels Only)
x = Don't Care (Use "0" or Space)
rr = Memory Channel No. (00 thru 99)
gg~~hhh = Value as defined in FA Command
d = Value as defined in MD Command
z = "0" (Not Used in TS-440)
RIT/XIT Clear
_____________
RC;
The RIT/XIT will be set to 0.00 kHz.
RIT/XIT Down
____________
RD;
The RIT/XIT will Decrement by 0.01 KHz. (10 Hz.)
RIT/XIT UP
__________
RU;
The RIT/XIT will Increment by 0.01 KHz. (10 Hz.)
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| Kenwood TS-440S (TS 440 S TS440S) increase the
power by ALC control |
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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. Illustration captions:
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| Kenwood TS-440S (TS 440 S TS440S) with PIN-Diods |
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Hallo, ts440-owners! Recently i read about an upgrade for the ts440 concerning the bandswitc-diods. Originally, there are simple switching types built in. For better high level performance i decided to replace D2,3,4,5,6,7,...23,68 by the ECG553 PIN Diode. The result was not so doubtless positive. i could not really confirm an advantage. unfortunately, i have no measuring equipment for determining the intercept point. But on 40m , where i sometimes have problems using a 160/80/40/30/20m 5-band fullsize dipole, i still suffer intermodulation effects. I can not really say, if it is much better after the replacement, but i'm sure, it isn't worse (hi). Some remarkable progress was the usage of the built-in tuner in the receiving pass. that really helped espacially on the 10mc band to overcome the problems of interference. But best results and a final solution i found in using an external preselector as described in the cq-dl several times. That really did it! Of course you need to add on to cinch connectors at the rear panel. It is no real problem. so, my advice: dodn't modificate the diods or use of the tuner for reception. The result is too poor compared with that of an external preselector. |
| Kenwood TS-440S (TS 440 S TS440S) Operation with
the MC-85 |
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With some TS-440S transceivers, insufficient modulation may occur when the MC-85 compression switch is turned on. This may be caused by too much of a voltage drop across resistor R172 on the IF unit of the transceiver . If this is found to be the case, change the resistor from 1K ohm to 100 ohms. Required part PROCEDURE:
 This modification may be covered under warranty. |
| Kenwood TS-440S (TS 440 S TS440S) Notch filter
low frequency improvements |
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The low frequency attenuation characteristics of the notch filter can be improved by reducing the input level to the notch filter chip (IC1). To compensate for the loss of input level, the amount of negative feedback to the audio amplifier (IC7) will need to be reduced. This modification is already incorporated in all models beginning with serial number 704XXXX. Required parts: 120K Ohm, 1/6 Watt resistor ........ RD14CB2C124J 390 Ohm, 1/6 Watt resistor ........ RD14CB2C391J
 This is an optional change that may not be performed under warranty. |
| Kenwood TS-440S (TS 440 S TS440S) Protecting Q33 |
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If pin 7 (RL) of the remote connector is accidently connected to ground, current from the 14 volt line (14L) will damage transistor Q33 on the IF unit. This will prevent the radio from transmitting. To protect Q33, a 4.7 ohm resistor should be installed in series with the RL line on the foil side of the IF board. In the event that pin 7 is connected to ground, the resistor will open, but the transceiver will still be capable of transmitting. Required part:
 This is an optional change that may not be covered under warranty. |
| Kenwood TS-440S (TS 440 S TS440S) Case Screws
binding in the heat sink |
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Occassionally a case screw that fastens to the heat sink of the TS-440S will cross thread or bind when it is being inserted or removed. Binding may be caused by tooling marks on the screw or by burrs on the tapped threads in the heat sink. When a screw starts to bind, DO NOT TRY TO FORCE IT! as this may cause the head to shear off. If the screw is being removed and it starts to bind, return the transceiver to KENWOOD. Do not make attempts to remove the screw. In addition, if a transceiver is being brought to you with a scrw sheared off, return the unit to KENWOOD. Do not attempt to drill out the screw. If a screw starts to bind when it is being installed, carefully back
it out. Inspect the screw for marks or burrs and replace it if it is
questionable. Since the threads in the heat sink may be causing the
screw to bind, they should be cleaned by running a 3 x 0.5 mm tap into
each hole. To avoid cross threading, make sure the covers are properly aligned
when they are being installed. Proper alignment means that there is a
clear path for the screw to turn into the heat sink. |
| Kenwood TS-440S (TS 440 S TS440S) RX Audio Mods |
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Here's some easy modifications to improve the rx audio fidelity of Kenwood TS-440's. All references below are to the IF board component designations.
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| Kenwood TS-440S (TS 440 S TS440S)
Bandscope-Schaltung |
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Zum Herausführen der 2. ZF von 8,83 MHz genügt ein 33pf Keramikkondensator An Diode D34/ D36 auf der IF-Unit (X44-1680-00) und ein Stückchen RG-174 Coaxleitung. Eine genaue Anleitung findet ihr in der Clubzeitschrift des DARC e.V. Da ich keine zusätzlichen Löcher bohren wollte, habe ich entgegen der
Anleitung die paar Schrauben mehr gelöst, und die unbeschaltete
Chynchbuchse auf der Rückseite benutzt.
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| Kenwood TS-440S (TS 440 S TS440S) Modifications
in FM mode |
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FM rx-modification The TS-440 FM receiver seems to be constructed for 25kHz steps. Using 10kHz steps, the bandwidth is much too wide. Using the 8.83 MHz filter on the RF board, which is normally bypassed by FM solved this problem and I got a very useful FM rig, even with the original F-Type filter. Required parts: 2 diodes 1N4148
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