[Kenwood] TS850s serial 41..............

[Cikku Cipic]

Here is the whole story!




> I have just completed a full list of syptoms and info, to try and pinpoint
> the problem
> Here it is :
>
> Setup:
>
> 120 feet loop, fed with 300 ohms cable > Morgan arrestor > isolating relay
> > 1:4 Balun > SG239 auto tuner > 12 feet coax > antenna/dummy switch >
> Drake LPF> TS850S back markings:  serial 410……….28    RTT/ATT/316  Japan
> Z   02231
>
>
>
> Tuned to 14 MHz, BK VOX-FULL buttons pressed in, pressing the key, alc
> carrier present, but, no RF out to excite the outboard rooftop auto
> tunerSG239. RX/TX change over normal, but not sure if on TX I should have
> heard the keying relay click. Receive excellent.
>
>
>
> Loaded with a dummy, RF present, but SWR high, key down for less than 10
> seconds, as do not have sufficient heastsink  on dummy, but , normally it’s
> ok for  10 seconds or less. However this time, varying the carrier knob
> from zero to max, indicated maximum alc drive  at mid pot point, then
> carrier started to decrease to zero, as pot advanced to maximum  ( sort of
> two peaks  ). The dummy burnt down, open circuit.
>
>
>
> Now, when pressing the send button (top of auto tuner buttons) the red LED
> lights up, but, no carrier, or RF output.  TX/RX change over normal.
>
>
>
> But, when using cw mode, VOX & FULL pressed, “on air” lights up, carrier
> alc present, carrier pot working normal, No RF out, or just 1.5 watts are
> showing on the meter. TX/RX changeover, normal.
>
>
>
> I do not hear any relay clicks on keying, now, but I think I used to!  The
> fans, on both the PSU and the transceiver have hardly ever been heard
> working. I never transmit at full power, always around 50watts, according
> to the meter. Is this normal? I can see a temperature sensor on the
> schematic, on both fans.
>
>
> Paul
>
> 9H1FQ
>
>>
>>
















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On Wednesday, January 25, 2017, Dan Violette <danki6x at socal.rr.com> wrote:

> No relay sound probably I don't have one).  I forget if there is a
> mechanical relay that can be turned on/off depending on how you want to
> drive an amp.
>
> Verify CAR control on 10.  Done that before and panicked for a bit.
>
> Was it working recently with no changes really made?
>
> Dan KI6X
>
> -----Original Message-----
> From: Kenwood [mailto:kenwood-bounces at mailman.qth.net <javascript:;>] On
> Behalf Of Cikku
> Cipic
> Sent: Tuesday, January 24, 2017 6:48 PM
> To: kenwood at mailman.qth.net <javascript:;>
> Subject: [Kenwood] TS850s serial 41..............
>
> No RF output, red led on,   pressing send switch ( top of atu switches) no
> carrier on alc meter, but, with key down on cw, the red led light and on
> air,  light up, with no RF out. Vox and full buttons enabled.
>
> I do not hear the relay click on tx, or shouldnt I? I do not remember.
> Rx-Tx changeover normal, and rx reception, excellent.
>
> Any clues please, before I start opening?
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