[ARC5] TCS 50-Ohm Matching Configurations.

[DSP3]

Dave,

Very good info.  I tried them out bhut the one that falls into place for 
me is using Tap 5.  I can't get power out using Tap 4 or 6?  The R-24 
Q-5er crapped out yesterday but found a bad cap buried in the rear area, 
the audio primary bypass was bad.  That's a new one?  Back on the air.  
I run about 600v and tuned indicating 165ma for 38 watts output. Scope 
looks quite good.  I will archive your data in my ARC-2 manual.  Who 
knows who will need it in 30 years????

Jeep - K3HVG


On 5/11/2018 7:50 AM, David Stinson 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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