[Milsurplus] More TCS questions

[Jack Antonio]

Hi all

I cant speak for TCS, I never got bit by the TCS bug, but for command sets
(BC-696 and its kin)
I noticed the following:

Just using a 100 pf cap in series with the output into a 50 ohm load, I
could get 35 watts out,
with the coupling control maxed out.

With both a 100 pf cap and a 1 to 4 step up transformer, I get 40 watts with
the coupling
control at about half scale.  This tells me the command set was not designed
to match a resistive
component as high as 50 ohms.

Interesting experiment would be to chart settings for the coupling control
vs. load resistance.
Interesting sub-experiment would be to vary the 100 pf series cap and see
how that
affects the setting of the coupling control.


Jack

Jack Antonio WA7DIA
scr287@sbcglobal.net


> All the TCS-set series inductance INCLUDING the rotating output link are
> meant to introduce Xl to offset the Xc.
>
> But ham antennas resistive & if just link used, TCS link's Xl will
> shift phase & no power will be delivered to the R.
>
> Mike Hanz suggested the 1:4 step-up broadband (toroidal) xfrmr & I
> tried it into a 50 ohm dummy load.  Nothing... confirming last
> paragraph.
>
> With the right C* in series with the link, things'll do right - for the
> TCS & the command sets.  The rotating link is all that's needed to adjust
> the "effective output match turns ratio" to transfer power to 50 ohms.