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

[DSP3]

Very good information.  Very good, indeed.

K3HVG


On 5/11/2018 3:32 PM, Nick England wrote:
> 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 
> <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 
> <mailto: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 <http://www.navy-radio.com>
>
>
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