Modifications for the Kenwood TM-V7E

Modifications for the Kenwood TM-V7E
Picture(s) of Kenwood - TM-V7E
19-071998
TM-V7E mike & PF1 <> PF4 (1750hz) English language
28-031999
Expanding the Kenwood TM-V7: A & E versions English language
02-121999
PG-4S programmer cable for the TM-V7x German language
02-072000
Expanded RX/TX and crossband repeater English language
28-102001
Conversion document English language
28-102001
Computer interface for TM-V7A&E English language
08-122002
Working programming cable TM-V7e English language
19-07-1998
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TM-V7E mike & PF1 <> PF4 (1750hz)
TM-V7(E)
---------UP ---+------------------+
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PF3 +100K+--o/o--------+
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PF4 +22k+---o/o--------+
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8V -> frei/free/libre
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GND(masse)---------------+--o/o---+
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DWN---+------------------+
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PF1 +100K+--o/o--------+
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PF2 +22K+---o/o--------+
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STBY(ptt)-------------------------+---> PTT
GND(mic)------o/o---Mic 600ohm
MIC------------------/
NC:-> frei/free/libre
Legende:
o/o = Schalter oder Taster / switch / bouton ou interrupteur
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28-03-1999
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Expanding the Kenwood TM-V7: A & E versions
Original TM-V7A Mod from [email protected] (MR CORY B
MCDONALD)
Additional TM-V7E notes from [email protected] (Mike Bowyer)
Original TM-V7A Mod:
Remove the top and bottom covers.
Look at the vertical p.c. board behind the front of the radio. There will be 2 small chip
resistors on the left side of the board.
Carefully remove the one with the number 0. It will be the one closest to the left near
the grounding spring. You will probably have to scrape it off with a pair of needle nose
pliers.
After you remove it the VFO ranges should be:
VHF TX 136.995 - 173.995. RX should be 118-174.
UHF TX should be 410-469.995 RX should be 300-470.
Additional TM-V7E notes:
There is a row of five numbered links on the edge of the front panel board.
In my E version radio, 0, 2 & 3 were made as standard. I now have only one link fitted
in the number 4 position which enables the repeater function not defaulted in European
versions. I have removed all other links.
I can now also receive the AM Aircraft band (118-137MHz). It is possible to change
from AM to FM by pressing the MHz button for 1 second. Plus I have discovered doing
the same key press (MHz for 1s) in the UHF band gives a 800-999Mhz RX band.
The European version has a 1750Hz tone-burst function, a modified band plan for the
auto-repeater shift function, adds a -7.6Mhz repeater shift and sets the band limits to
144-146 & 430-440 - the AM Air band & 800Mhz bands are disabled. All these European
'features' are lost when the radio is expanded.
(The repeater offsets are still programmable, but you must learn how to whistle at
1750Hz). I think the only other difference between the A and E versions is that the E
version has an N type antenna connector fitted.
Making link number 5 causes the radio to power up in a Memory recall mode (i.e., with
channel numbers) and so is not overly useful!
I'm not sure exactly what links 0, 1, 2, & 3 all do individually! Maybe other
configurations are possible: any information would be gratefully received.
As for RF performance, the front-end (and PA) must be tweaked to use frequencies
other than the factory alligned defaults, with a little tweaking out of band performance
should come good (at the expense of regular 2m/70cm performance).
The chip resistors are SMD zero ohm things - a wire link (or solder blob) will do the
same job. They can be carefully removed (for re-use) by using a fine tipped iron, desolder braid, and a pair of long nose pliers or tweezers. The front board can be carefully
detached from the rest of the radio to make removing the links easier.
Mike Bowyer.
Date: 13-10-2001
User comment
From: Bg36c
Subject: DTSS
The DTSS will be disabled and no longer function after performing this mod. At least it
doesn't on my radio anymore.
Date: 02-02-2002
User comment
From: philip
Subject: kenwood tmv7 extended tx
with reference to the above mod ,yes all works fine but no extended tx
i have no jumpers conected from 0 to 4 no 4 has a wire jumper,this enables extended
rx, but to extend the tx you must add a wire jumper to no 2 .
regards phil
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02-12-1999
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PG-4S programmer cable for the TM-V7x
Author: Wulf, DB8KY
NOTE: This is not a copy of the existing PG-4S cable but a replacement designed by DB8KY.
One of the most handy things about this transceiver is: you can program this transceiver by
computer. You can download the software from the Kenwood site but there no datasheet of the PG4S cable which you require. I found a datasheet which replace the PG-4S cable and is designed by
DB8KY. I made this cable and it works fine on my transceiver.
The manual is written in German by DB8KY. He said he never tried this cable on a TM-V7, but it
works very good on my transceiver. So here below you will see the instructions.
Have fun! PE1PTS
Der Kenwood TM-G707E ist ja ein schoenes Geraet und die Vergabe von Speichernamen ein nettes
Feature, wenn man das alles nur vom Rechner aus programmieren koennte...
Kann man, die Software dazu steht bei Kenwood auf der Web-Seite, dann fehlt nur das Kabel zum
Anschluss an den Rechner. Ich habe zwar keine Ahnung was sich in dem original PG-4S Kabel von
Kenwood abspielt, wenn man den TM-G707E aber in den Clone-Mode versetzt und sich mal die
Signale auf der Mini-DIN Buchse ansieht wird klar, dass es sich bei der Elektronik im Kabel um
einen TTL/RS232-Wandler handeln muss. Die unten dargestellte Schaltung erfuellt diese Aufgabe
bei mir jedenfalls klaglos. Ich denke das ganze funktioniert auch am TM-V7E.
Wie funktioniert es:
Die Verbindung zwischen Pin 4 und 5 benoetigt der Kenwood wohl um von FSK auf seriellen Betrieb
umzuschalten. Das Signal vom PC zieht ueber R5 mit T2 den RxD-Eingang am Kenwood low, hier
ist intern offensichtlich bereits ein Pull-up
Widerstand vorhanden. Schwieriger ist der Weg vom Kenwood zum PC, der Kenwood gibt nur ein
TTL-Signal aus, der serielle Eingang am PC will aber +/- ca. 10V sehen. Also muessen zwei
Hilfsspannungen gewonnen werden. Aus dem RTS-Signal
des PC wird ueber R1 eine positive Spannung gewonnen und mit D1 und C1 stabilisiert. Aus dem
TxD-Signal des PC wird ueber D3 und R6 dann noch eine negative Spannung gewonnen und mit C2
gepuffert. Dann kann der Kenwood mit den Sendedaten ueber T1 jetzt zwischen der positiven und
negativen Spannung umschalten.
Ich habe das ganze in den Sub-D Stecker reingefummelt.
Viel Spass damit wuenscht Wulf, DB8KY
DB8KY @DB0RWI.#NRW.DEU.EU
(Wer das nachbaut tut es auf seine eigene Verantwortung)
PC D-Sub 9pin TM-G707E 6pol. Mini-DIN
R1/R6 = 150 Ohm
R2 22 kOhm
R3 10 kOhm
R4 33 kOhm
R5 15 kOhm
C1/C2 = 1uF/16V Elko
D1 = Z-Diode 5,1 Volt
D2/D3 = 1N4148 oder aehnlich
T1 = BC558A oder aehnlich
T2 = BC337 oder aehnlich
For an English Interpretation, visit KC7ZRU's pages. Includes RS part numbers, redrawn schematic and user comments.
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02-07-2000
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Expanded RX/TX and crossband repeater
If you want just mod the RX QRG remove the resistor R546.
For the TX-RX mod remove R542 & R546
3210
TX
RX
TX
RX
OOXO
144/146 144/146 430/440 430/440
XOXO
144/146 144/146 432/438 432/438
OOXX
144/146 118/174 430/440 300/470
XOXX
136/174 118/174 410/470 300/470
REM:With one of this 4 mods you can have the 1750 of the mike.
But if you want have the bigest mod (but no 1750) you can try:
XXXX
136/174 118/174 410/470 300/524
XXXO
136/174 118/174 410/470 300/524
For the cross band repeater jump the strap 4
----------------------------------------------------------------------------01234
56
----------------------------------------------------------------------------3= R542 (W501)
2= R543 (W502)
1= R544
0= R546
O = JUMPER
X = NO JUMPER
This modification has been read 5349 times.
28-10-2001
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Conversion document
1. Conversion function items and conversion types
1. Reception wide band .... [Conversion A] ...... K destinations outside 800-MHz band
support
2. Cross band repeater ... [Conversions A and B] .... Complete with K destination measures
3. Page answer back ... [Conversions A and B] ... Complete with K destination measures
4. DTMF remote ..... [*]
* Operates even without conversion, but some items function when Conversions A and B are
made.
2. Conversion Methode
1. Conversion location
Remove the power cord from the main unit, remove the upper/lower case, flip down the
panel as in the figure below, than operate.
Factory setting destination jumper table.
Destination jumper
Destination
Bit Ref. no. (K destination) K
M
E
3
R542 (W501)
O
X
O
2
R543 (W502)
O
X
O
1
R544
O
O
X
0
R546
O
X
O
O:= Jumper
X:= No jumper
Conversion A ..... Reception wide band (Already dealt with for M destinations)
E destination ..... Eliminates mounted chip jumper resistor R542 (0 ohm).
K destination ..... Cuts the mounted jumper wire (W501).
Conversion B ...... Repeater/answer back (Already dealt with for K destinations)
Chip jumper resistor 0 ohm added (R92-0670-05)
* The chip removed in Conversion A can be used in Conversion B.
* When adding or eliminating the chip jumper resistor, be careful not to peel off any
printed circuit pattern and not to harm any other parts.
2. Contents of settings by destination
For the list of contents of settings for each destination, see (Appendix tables 1 - 5).
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28-10-2001
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Computer interface for TM-V7A&E
Author: Jann DG8NGN - [email protected]
To program your memories of the Kenwood TM-V7 you need this interface. The software is downloadab
Kenwoods Webpage www.kenwood.net, or here. Download the MV7101.EXE file. The software can only
communicate with serial port 1 or 2! mods.dk/manuals/kenwood/TM-V7_MCPV7_Version_1.01_Memory_Control_Program.zip
Parts list. R1/R6 = 150 Ohm
R2 = 22 Kohm
R3 = 10 Kohm
R4 = 33 Kohm
R5 = 15 Kohm
C1/C2 = 1uF/16V
D1 = 5,1 V Zenerdiode
D2/D3 = 1N4148 or equal
T1 = BC558A or equal
T2 = BC337 or equal
08-12-2002
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Working programming cable TM-V7e
Author: Roland Boerboom - [email protected]
Hello,
I have good news for you, I have a working programming cable for the TM-V7e.
I have tested the cables on www.mods.dk, but the don't work.
Now I have a working cable, and I send you the JPG-file with the layout of this cable.
Greetings from Roland, PD2RLD, the Netherlands.
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me.
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have, is listed on this site.!
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