[MRCA] ART-13 Tuning

[Mack McCormick]

Chris,

Thank you. I will experiment with a variable cap on the shunt output.
73,

Mack
W4AX
https://www.qrz.com/db/w4ax


On Mon, Mar 13, 2023 at 4:56 PM Christopher Bowne <aj1g at sbcglobal.net>
wrote:

> I use a probable 750 pf variable
> across the output from my ART-13 transmitter, it definitely has an affect
> when loading into a low (50-75 ohm) impedance non reactive antenna or dummy
> load.  Can get at least 100 watts out and normal SWR indications using a
> Heath HM-102 wattmeter/SWR meter.  4000
> pf fixed shunt on output seems excessive.
>
> Chris, AJ1G Stonington CT.
>
> Sent from my iPhone
>
> On Mar 13, 2023, at 15:29, Mack McCormick <w4ax.mack at gmail.com> wrote:
>
> 
> Jeep,
>
> Thank you very much for responding. I will give your settings a try and
> report back. My voltages from the power supply are almost identical to
> yours.
>
> Mack
> W4AX
>
> On Mon, Mar 13, 2023 at 15:09 Jeep Platt <jeepcomms at outlook.com> wrote:
>
>> I use a setting of 8 for 75 meters. The loading control (to the left
>> side) has no genuine effect. I also use about 850pf of external loading. At
>> 1250v B+, I read 120 watts into 50 ohms.  Other p.s. voltages are 400v and
>> 27.5v.
>>  Jeep K3HVG
>>
>> Sent from my Verizon, Samsung Galaxy smartphone
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> --
> 73,
>
> Mack
> W4AX
> https://www.qrz.com/db/w4ax
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