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G4WYW > MODS 04.10.03 05:25l 72 Lines 3175 Bytes #999 (0) @ WW
BID : 377551G4WYW
Read: GUEST DL9NDQ
Subj: Re: TS-50s Mods?
Path: DB0AAB<DB0PV<DB0FSG<DB0GAP<DB0BOX<DB0MRW<DB0ERF<DB0FBB<DB0GOS<ON0AR<
ON0AR<VK6HGR<VK3TE<VK3KAY<ZL2BAU<GB7BHM<GB7BHM<GB7COV<GB7KHW<GB7WSX<
GB7SOU
Sent: 021206/2020Z @:GB7SOU.#48.GBR.EU #:6872 [Bishops Waltham] $:377551G4WYW
From: G4WYW@GB7SOU.#48.GBR.EU
To : MODS@WW
CT1GFQ wrote:-
> From: CT1GFQ@CT2GWY.CTBJ.PRT.EU
> To : MODS@WW
>
> Hello all!
> I'dd like to knows, if anybody have any mod to kenwood TS-50-s
> Thanks, and Marry Christmas!
> 73! de Fonseca, Carlos - CT1GFQ
Hi, copied below is some mod info for the TS50 to adjust for QRP Power.
The TS50 is an excellent little radio with a big performance and I worked
much DX when I had mine including Spratley Islands and Galapagos (both of
them confirmed) Pakistan and a host of other places including VK and ZL.
The info below was originally supplied by Bob WA6ERB who put it on to
packet.
Hope this will be useful to you...
73 de Mel G4WYW@GB7SOU
"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.
73 - Mel, G4WYW @ GB7SOU.#48.GBR.EU
Message timed: 20:17 UTC on 06 Dec 02
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