[ARC5] ART-13 Power Output

[Meir WF2U]

I'm getting around 120W out with a DY-17 with 28 VDC into its input pins. I never note the RF ammeter indication because I'm looking at the relatively accurate forward power meter on the automatic antenna tuner the ART-13 is feeding. I tune the transmitter to the plate current (actually it's the combined plate and screen current) according to the value in the manual. I also use a 500pf capacitor across the output on 75/80 m.

73, Meir WF2U
Landrum, SC

On November 22, 2015 1:43:50 AM EST, Dennis DuVall <duvallddennis at gmail.com> wrote:
>Chris,
>
>I’m getting 150 watts out of mine on 75M with a 1300 volt HB supply and
>running  into an ME-162 box.  My RF front panel RF ammeter reads 2.2
>amps which would be 242 watts out so my current reading gotta be way
>off like yours.
>
>Dennis D.  W7QHO
>Glendale, CA
>
>******************
>> On Nov 21, 2015, at 2:12 PM, Chris Bowne <aj1g at sbcglobal.net> wrote:
>> 
>> Was wondering what the consensus is re typical RF power output of an
>ART-13 when powering a nominal 50
>> Ohm non-reactive load, especially when using a DY-17A dyno power
>supply. Mine has consistently shown a nominal 175 watts when fully
>loaded on a variety of watt meters including two different HM-102 Heath
>units.  None are probably high accuracy (I have a Bird combined 500w
>dummy load/wattmeter but the wattmeter does not work). I use a nominal
>500 pf  variable cap across the transmitter output and when loaded up
>to the top of the plate meter green band on CW to and indicated 125 mA,
>I will see about 3.4 units indicated an the RF output meter function
>indication.  I suspect the RF  current indication is not calibrated in
>true RF amps because I squared R of 3.4 A into 50 ohms works out to 537
>watts!  OTOH if the plate current is true mA plate input power works
>out to about 137 watts for 125 mA and a nominal plate voltage of 1100v
>from the DY-17 (I know that the current meter also includes  the screen
>current also but I am neglecting it for an ROM  calc).  137 watts input
>seems in
>>  the ball park for the rated nominal 100 watts out, implies a plate
>efficiency of about 73 percentage, a little on the high side but not by
>much.  So my guess is that my actual RF output is probably closer to
>100 watts than 175.  Anyone done any measurements
>> with an accurate wattmeter?
>> 
>> 
>> Sent from my iPhon
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