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TS680.MOD
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1980-01-01
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TS680
THIS MOD WILL ALLOW OUT OF BAND TRANSMIT ON THE KENWOOD TS-680-S.
REMOVE THE BOTTOM COVER.IN THE MIDDLE OF THE BOARD IS A DIODE MARKED D-31
JUST CLIP IT AND REINSTALL BOTTOM COVER.THIS WILL ALLOW TRANSMIT FROM
1.6 MHZ TO 33 MHZ AND 49 MHZ TO 56 MHZ.I HAVE NO OTHER MODS FOR THIS RADIO AT
THIS TIME.I AM STILL TRYING TO FIND WHERE THE MISSING 10 MHZ FROM 35 TO 45
AND WILL POST IT IF IT IS POSSIBLE.
73 CARL VE3ZCO@VE3GYQ BBS
CARL@HAMSTER.BUSINESS.UWO.CA
TS680.1
Date: 12 Aug 90 03:05:48 GMT
From: portal!cup.portal.com!Steve_M_Kile@apple.com
Subject: Kenwood TS-680 mods
To: info-hams@ucsd.edu
TS680s Squelch modificatios - adds squelch to all modes
Parts required
1 each 100 uF 20 v capacitor
1 each 10k ohm 5% 1/4W resistor
2 each 1N914 small signal diodes
Modification:
All modifications are to the signal board. Remove the signal board
to gain access to the bottom of the board.
Remove R178 100 ohm resistor. (I cut the land between C177 and R178)
(Removes FM chip control voltage) R178 is on the bottom of the
board.
Add jumper with a diode in series between IC6 pin 14 and the base of
Q57. Cathode of the diode goes to the base. (This is the squelch
trigger control voltage) Q57 is on the bottom of the board.
Connect a diode between the 8V line (very near IC6) and pin 4 of
IC6. This activates the FM chip (IC6) all of the time. Cathode goes
to pin 4, anode to the 8 volt line.
Connect a 10 k ohm resistor between IC6 pin 4 and IC6 pin 14.
Connect a 100 uF 25 volt capacitor between IC6 pin 14 and ground.
(This slows this quick squelch down a little bit)
Tests have shown (using commercial communications monitor) that
activating FM chip IC6 does not degrade IF strip performance at all.
I have had this mod in my 680 for a bout year and a half and is
still working great!
TS-680 6 METER POWER OUTPUT INCREASE
Adjust VR15 (50M) control on the SIGNAL UNIT board while monitoring
6 meter transmit power out put into a 50 ohm dummy load. I adjusted
mine while also monitoring the ALC level to insure that I still had
some ALC action. Using this method I have increased my 6 meter
power output to appx. 25 watts.
Broadcast Sensitivity Modification for the TS680S / 140S
Between .500 and 1.6 MHz attenuation is added to reduce? front-end
overload on the Broadcast band. Some of us BCB DXers find this a
HIGHLY undesirable feature. If I want attenuation I will use the
front panel switch. The following mod will restore the sensitivity -
Cut the land between IC1 pin 11 and R7 (SIGNAL UNIT, M54581P)
Cut the trace between IC1 pin 12 and R10
Add a small signal diode (1N914, 1N4148) between IC1 pin 11 and R7
(Cathode towards R7)
Add a small signal diode between IC1 pin 12 and R7 (Cathode towards
R7)
Trace the lands from pin 11 and 12 of IC1 and you will find a good
place (to the left of connector CN5) to cut these traces as well as
pad to solder the diodes to.
73, WB5HJV
David A. Underwood
9705 Caffrey
Houston, Texas 77075
TS680.2
TS140/680 Service Tip
After replacing finals and/or drivers in the TS140/680
check that all filter relays are operating correctly. Failure
of a band's relays to pick will cause the finals to run into an
open circuit and possibly (probably?) damage them.
Check the following points for approximately 12 volts.
These diodes are on the filter board next to the final unit.
Band Diode Band Diode
1.8 D1 24.0 D6
3.5 D2 28.0 D6
7.0 D3 28.5 D6
10.0 D4 29.0 D6
14.0 D4 29.5 D6
18.0 D5 50.0 - 54.0 D7 TS680 only
21.0 D5
If the problem is in the 1 of 10 decoder chip IC2 on the
signal board (74LS145) unlock problems may also occur.
Fred Burton .. @ VE3HPL
From: KC4JCZ@WA4ONG
To: KJ6FY@KJ6FY
Hello from Richmond, Va. I noted your message about looking for a mod. Un-
fortunately I don't have that mod. I do have, however, the mod for the Ken-
wood TS-140S HF all band radio if you want it. Snipping diodes D29 and D31
not only will permit all-band, all-mode transmit, but it will also unlock
the 40 and 60 watt limit for FM and AM power max respectively.
I am, however looking for a mods for the Kenwood 2m mobile rig (221 I think)
that will allow it to TX/RX up to 170 MHz or higher. I am already aware of the
mod for that rig where you snip the wire looking around the display to mod for
MARS/CAP (up to 151 MHz).
Also am interested in a mod to unlock the Yaesu FT-212RH 45 watt mobile rig
for TX/RX up to 170 megs or higher. A friend would rather buy one of these
rigs than buy a mobile 2m and a marine radio. (he is aware of 25 watt ceiling
for marine).
Many thanks..will keep you informed of any future mods I hear of.
(P.S. cut diode D81 on Kenwood 440 HF rig for all-band MARS/CAP..almost
forgot!).
73...de Bill KC4JCZ @ WA4ONG