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- 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: <C3zuE5.8Fu@well.sf.ca.us>
- 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
-
-
-
- Copied from the QRZ! Windows Ham Radio CDROM
-
-