[Milsurplus] T-47/ART-13 into 50 ohm load

[mac]

Meir,

OK, you're running a high C tank configuration here.  With control "C"  
on 7 the big tapped coil (L113) is completely shorted out and all your  
inductance is coming from the variometer (control D).

I have been operating on 75M with "C" set at 5 and  400pf shunt  
capacity across the output as I mentioned before.  Arrived at the  
latter value some years ago via "cut and try."  Checked today and  
found that with "C" set on 5, 400, 200 and even 100pf shunt capacity  
all give me the same 100 watts out into a 50 ohm dummy load with only  
minimal changes in the settings of "D" and "E" with the 813 maybe  
running a little more efficiently with the higher value shunt cap. "D"  
set round 45 and "E" at 190 through all of this.

Maybe time to revisit some stuff...  :^)

Dennis D.  W7QHO
Glendale, CA

************
On Mar 23, 2013, at 12:50 PM, Meir WF2U wrote:

> Dennis,
>
>
>
> I use a fixed 2000pf cap between the CAP terminal and ground, with  
> control C
> on 7.
>
> This gives me a good match across the band with 92-100 watt output  
> into 50
> ohms (using the DY-17/ART-13 dynamotor), with the plate current  
> meter dip in
> the correct range,  with minimum tweaking of controls D and E. D is  
> between
> 10 and 30, and E between 120 and 130 throughout the 75/80 meter  
> band. I
> haven't used the ART-13's on any other bands. I use a 256 foot long  
> Carolina
> Windom via an MFJ automatic antenna tuner.
>
> These setting are very similar on both of my ART-13's which are  
> currently
> operational - one is a T-412/ART-13B and a T-47/ART-13.
>
>
>
> Meir WF2U
>
>
>
>
>
>
>
>  _____
>
> From: mac [mailto:w7qho at aol.com]
> Sent: Saturday, March 23, 2013 3:25 PM
> To: Meir WF2U
> Cc: WA5CAB at cs.com; milsurplus at mailman.qth.net
> Subject: Re: [Milsurplus] T-47/ART-13 into 50 ohm load
>
>
>
> What cap values do you use? (Don't see/have your previous...)
>
>
>
> Dennis
>
>
>
> ************
>
>
>
> On Mar 23, 2013, at 12:08 PM, Meir WF2U wrote:
>
>
>
>
>
> Interesting...  I can't get maximum power with the dip in the  
> correct plate
> current range unless I use the cap value and settings I mentioned  
> before.
> My measured plate voltage under load, with the DY-17/ART-13 is 1120  
> volts.
> It's the same with both my T-47/ART-13 and T-412/ART-13B.
>
> 73, Meir WF2U
>
>
>
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