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

[Meir WF2U]

Dennis,

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


-----Original Message-----
From: mac [mailto:w7qho at aol.com] 
Sent: Saturday, March 23, 2013 2:33 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

I run my ART-13 (ATC) off a 1000 volt supply (Vs. a "Standard"  
1200V?).  For OPTIMUM loaded Q, L/C ratio, PA efficiency,  
etc.,different circuit values would be required for different supply  
voltages.  As I mentioned before, however, the ART-13 tank circuit  
configuration will practically accommodate a very broad range of shunt  
capacitance values with little apparent degradation in the radio's  
performance.

Dennis D.  W7QHO
Glendale, CA

**************
On Mar 23, 2013, at 10:48 AM, Meir WF2U wrote:

> Dennis,
>
> What plate voltage are you feeding your ART-13 with?
>
> Obviously, not the standard voltage as produced by the dynamotor.  
> The values
> are going to be different, as in you case, because the output  
> impedance of
> the 813 will be different, requiring different output circuit values.
>
> Meir WF2U
> Landrum, SC
>
> -----Original Message-----
> From: milsurplus-bounces at mailman.qth.net
> [mailto:milsurplus-bounces at mailman.qth.net] On Behalf Of mac
> Sent: Saturday, March 23, 2013 1:22 PM
> To: WA5CAB at cs.com
> Cc: milsurplus at mailman.qth.net
> Subject: Re: [Milsurplus] T-47/ART-13 into 50 ohm load
>
> For 50 ohms I use fixed shunt caps, 400pf for 75/80 meters, 200 for 40
> and 100 for 20.  A 400pf variable would cover the whole range, of
> course.  Range of adjustment inherent in the ART-13 tank circuit os
> very wide, I can load into 50 ohms FB on 75M with only my 200pf  40M
> shunt switched in for ex. and conversion articles I've seen over the
> years list shunt cap. values all over the lot.  Never tried a UnUn....
>
> Dennis D.  W7QHO
> Glendale, CA
>
> ************
> On Mar 23, 2013, at 9:00 AM, WA5CAB at cs.com wrote:
>
>> How well does a T-47 (or equivalent) match a 50 ohm resistive load
>> on say 3
>> to 10 MC?  Is there any standard outboard "fix" like an UnUn or shunt
>> variable capacitor?  Purpose would be to feed a remote antenna tuner.
>>
>> Robert Downs - Houston
>> wa5cab dot com (Web Store)
>> MVPA 9480
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