[ARC5] First AM QSO with the SCR-274! RF Ammeters

[Kenneth G. Gordon]

On 17 Apr 2017 at 8:30, Mark K3MSB wrote:

> Congratulations!!    Your efforts are spurring me on to get my SCR-274N going on AM.  

Me too! :-)
 
> 2 Amps?   Are you using the meter on the antenna relay unit?   If so,  even though it says 
> "Antenna Current" the dial is not calibrated,  so a 2 is not 2 Amps.    I get about 2 on my 274N on 
> 80M,  but using a T-19/T-22 I barely get the needle moving, yet both give me about 40 to 50W 
> output on CW.

The reading from any RF ammeter is completely dependent on what impedance the rig is 
"looking" into.

For instance, since P=I^2R, 50/4=12.5 ohms.

Ken W7EKB

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