[ARC5] [MMRCG] TCS 50-Ohm Matching Configurations.

[Nick England]

There actually is an official USN adapter for TCS to 50 ohms.
CU-837/URC.
I took some photos and
sketched out the schematic -
http://www.navy-radio.com/xmtrs/tcs.htm#cu837

Nick


On Fri, May 11, 2018 at 7:50 AM David Stinson <arc5 at ix.netcom.com> wrote:

> Yesterday, I took a few minutes to test three of
> the suggested capacitive matching methods which
> adapt a 50-Ohm non-reactive load to the output
> of TCS and similar transmitters.  The ARC-2 is
> on the bench and it has an output circuit similar
> to the TCS, so used that for the test.
> Can get some time to do this on the TCS
> if anyone is interested.  This wattmeter has not
> been calibrated in some time, so take these
> Power readings as relative.
>
> ARC-2 Primary 27V. Dynamotor B+
> All tests at 3890 KC, tuned for max out.
>
> 100 pFd capacitor in series to load.
> 40 W out.
> 130 mA PA current.
> ARC-2 Ant Tuning 472
>
> 1000 pFd ANT to ground.
> 40 W out.
> 145 mA PA current.
> ARC-2 Ant Tuning 652
>
> Capacitive Divider (TCS tuning box)
> 270 pFd ANT to Load,
> 1370 pFd, Load to Ground.
> 44 W out.
> 190 mA PA Current.
> ARC-2 Ant Tuning 576
>
> "Each to their own," of course.
> My preference is to trade 10% of power out
> for a 30% reduction in PA current, which is
> not only easier on the PA, but makes fully
> modulating the rig that much easier as well.
>
> GL OM ES 73 DE Dave AB5S
>
>
>
>
>
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Nick England K4NYW
www.navy-radio.com
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