Newsgroups:rec.radio.shortwave,rec.radio.amateur.misc

From:roy@well.sf.ca.us (Roy Harvey)

Subject:TS-50 Power Mod for QRP

Message-ID:

Sender:news@well.sf.ca.us

Organization:Whole Earth 'Lectronic Link

Date:Tue, 16 Mar 1993 18:08:29 GMT

Lines:40

Xref:elroy.jpl.nasa.gov rec.radio.shortwave:22157 rec.radio.amateur.misc:36032





                    "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 the 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.







Newsgroups:rec.radio.amateur.misc

From:wa2ise@cbnewsb.cb.att.com (robert.f.casey)

#Subject:TS50 extended transmit mod file

Message-ID:<1993Mar24.130552.8427@cbfsb.cb.att.com>

Keywords:mods

Sender:news@cbfsb.cb.att.com

Organization:AT&T

Date:Wed, 24 Mar 1993 13:05:52 GMT

Lines:38





copied from packet:

  1783   1 19-Mar 2227 KA4RKT 14874_MTPASW MOD@USBBS ()

 Sb: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.



Replace cover.



Perform microprocessor reset as described in your manual.







Please -- This mod for use only by persons authorized to use those

          frequencies outside of the ham bands - such as MARS, CAP

          and such. This radio is not type accepted for commercial

          use outside of the ham bands....





Tom

KA4RKT @ WB4TTZ-1

========================================================================

Note:I haven't tried or verified this, proceed at your own risk. WA2ISE








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